Plastic film extrusion cooling equipment

Abstract

The present invention belongs to the technical field of plastic film cooling, and specifically refers to a plastic film extrusion cooling device, comprising a cooling box, one side of the cooling box is fixedly connected to a cooling box, one side of the cooling box is fixedly connected to a first water pump, one side of the cooling box is fixedly connected to a second water pump, an extrusion head is arranged above the cooling box, a first rotating shell is fixedly connected to the top of the cooling box, a heat recovery copper pipe is spirally wound on the extrusion head, and one end of the heat recovery copper pipe is fixedly connected to the first water pump; water is extracted by using the first water pump and the second water pump to realize water circulation, the heat recovery copper pipe is used to preheat the extrusion head, the cooling water is cooled, the cooling water in the cooling box is mixed by water flow impact, the circulation impact component cooperates with the pneumatic cooling component, when the water flows back to the cooling box, it impacts the rotation of the second impeller, and the impact of the water flow is used to realize the effect of blowing, so as to cool the surface of the plastic film and blow dry the water droplets at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic film cooling, and in particular relates to plastic film extrusion cooling equipment. Background Art

[0002] The plastic particles are heated and melted by the extruder, and then extruded into a plastic film by the discharging mechanism. At this time, the plastic film is still at a very high surface temperature after being melted at high temperature and extruded by the discharging mechanism, so it will immediately enter the cooling device for cooling and shaping.

[0003] The existing device uses water cooling to cool the plastic film. The water temperature of the cooling water continues to rise during the cooling process, and the cooling effect is not good. The water temperature near the plastic film is higher, and the water temperature in the cooling box is unevenly distributed, which causes uneven cooling of the plastic film. After water cooling, water droplets remain on the surface of the plastic film, affecting subsequent production.

[0004] Therefore, a plastic film extrusion cooling device is needed to solve the technical problems of uneven water temperature distribution in the cooling box during cooling and water droplets on the surface of the plastic film after water cooling in the prior art. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a plastic film extrusion cooling device, which adopts a cooling box as an intermediate water tank, utilizes a first water pump and a second water pump to extract water to realize the circulation flow of cooling water, utilizes a heat recovery copper pipe to preheat the extrusion head, and cools the cooling water in the cooling box at the same time, utilizes the impact of water flow to drive the first impeller to rotate, and cools the cooling water in the cooling box, thereby solving the technical problem that the water temperature continues to rise during cooling, and the circulating impact component cooperates with the pneumatic cooling component. When the cooling water flows back to the cooling box, the cooling water impacts the second impeller to rotate, thereby realizing the effect of blowing air, blowing air to cool the surface of the plastic film, thereby solving the technical problem that there are water droplets on the surface of the plastic film, and utilizing the impact of water flow to mix with the cooling water in the cooling box when the cooling water flows back, thereby solving the technical problems of uneven water temperature distribution in the cooling box and uneven cooling of the plastic film.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present invention is as follows: a plastic film extrusion cooling device proposed in this scheme comprises a cooling box, one side wall of the cooling box is fixedly connected to a cooling box, one side wall of the cooling box is fixedly connected to a first water pump, one side wall of the cooling box is fixedly connected to a second water pump, an extrusion head is arranged above the cooling box, the top wall of the cooling box is fixedly connected to a first rotating shell, a heat recovery copper pipe is fixedly spirally wound on the circumferential wall of the extrusion head, one end of the heat recovery copper pipe is fixedly connected to the output end of the first water pump, and the other end of the heat recovery copper pipe is fixedly connected to the output end of the first water pump. One end is fixedly connected to the input end of the first rotating shell, the outer wall of the cooling box is fixedly connected with a heat dissipation fin in a transverse linear array, the side wall of the cooling box is fixedly connected with a guide frame, the inner wall of the cooling box is symmetrically rotatably connected with a conveying roller, the top of the cooling box is fixedly connected with a cooling frame, one side wall of the cooling box is fixedly connected with a support seat, an impact cooling component is rotatably connected in the first rotating shell, a circulating impact component is rotatably connected on the support seat, a pneumatic cooling component is fixedly connected to one side wall of the cooling box, and the pneumatic cooling component is fixedly connected to the circulating impact component.

[0007] Preferably, the circulating impact assembly includes a circulating water pipe fixedly connected to the output end of the second water pump, a second rotating shell rotatably connected to a side wall of the cooling box in a transverse linear array, and a second driven bevel gear rotatably connected to the bottom wall of the support seat in a transverse linear array, a return pipe is fixedly connected to the bottom of the circumferential wall of the second rotating shell, and the other end of the return pipe is fixedly connected to the cooling box, a second impeller is rotatably connected to the inner wall of the second rotating shell, a second driving bevel gear is rotatably connected to a side wall of the second rotating shell, the second driving bevel gear is coaxially fixedly connected to the second impeller, and the second driving bevel gear meshes with the second driven bevel gear.

[0008] Preferably, the pneumatic cooling component includes a diverter fixedly connected to a side wall of the cooling box, one side wall of the diverter is fixedly connected to an air collecting pipe, the top of the circumferential wall of the air collecting pipe is fixedly connected to a blower in a transverse linear array, the blower has blades rotatably connected inside, the blades are coaxially fixedly connected to the second driven bevel gear, the top wall of the diverter is symmetrically fixedly connected to the diverter pipe, one side of the top wall of the cooling box is symmetrically fixedly connected to a blowing pipe, one end of the blowing pipe is fixedly connected to the other end of the diverter pipe, one side of the circumferential wall of the blowing pipe is fixedly connected to a blowing head in a longitudinal linear array, and the blowing heads on both sides are arranged opposite to each other.

[0009] Preferably, the impact cooling component includes a first driven bevel gear rotatably connected to the bottom wall of the cooling frame and a first impeller rotatably connected to the inner wall of the first rotating shell; a connecting pipe is fixedly connected to the bottom side of the circumferential wall of the first rotating shell, and the other end of the connecting pipe is fixedly connected to the cooling box; a first driving bevel gear is rotatably connected to one side wall of the first rotating shell, the first driving bevel gear is coaxially fixedly connected to the first impeller, the first driving bevel gear meshes with the first driven bevel gear, the top wall of the cooling frame is rotatably connected to a driving pulley, the driving pulley is coaxially fixedly connected to the first driven bevel gear, and the bottom wall of the first driven bevel gear is coaxially fixedly connected to the first fan.

[0010] Preferably, the impact cooling component also includes a driven pulley rotatably connected to the top wall of the cooling frame in a longitudinal linear array, the driven pulley is arranged on both sides of the driving pulley, the bottom wall of the cooling frame is rotatably connected to a second fan, the second fan is arranged on both sides of the first fan, the second fan is coaxially fixedly connected to the driven pulley, and a synchronous belt is provided on the driven pulley and the driving pulley on both sides.

[0011] The beneficial effects achieved by the present invention using the above structure are as follows:

[0012] 1. The present application utilizes a cooling box as an intermediate water tank. The first water pump draws water into the cooling box. The second water pump draws water into the cooling box. The cooling water in the cooling box is circulated and cooled. The cooling water flows to the heat recovery copper pipe to preheat the extruder head and reduce the water temperature at the same time. The cooling water flows to the cooling box through the impact cooling component. The heat dissipation fins cool the water. The water flow impacts the first impeller to rotate, driving the first fan to rotate and blow air. The synchronous belt connects the driven pulley to drive the second fan to rotate and blow air, thereby accelerating the reduction of the water temperature. The second water pump draws the cooled cooling water into the cooling box. The water flow impacts the second impeller to rotate and enters the cooling box to achieve uniform distribution of the water temperature in the cooling box and ensure uniform cooling of the plastic film. The second impeller drives the blades in the blower to rotate, blowing the air into the air collecting pipe, and using the air blowing head to blow out the air to cool the plastic film and dry the water droplets at the same time.

[0013] 2. The blades in the blower rotate and blow the wind into the air collecting pipe. The diameter of the air collecting pipe is small. The air flow is diverted by the diverter, and the two sides of the plastic film are evenly blown to cool down, and the water droplets on the surface of the plastic film are dried. The plastic film blocks the air flow, so that the air flow diffuses around the plastic film. The diffused wind blows to both sides of the plastic film to reduce the water temperature of the cooling water;

[0014] 3. The second water pump extracts the cooled cooling water, and the water flow impacts the second impeller to rotate, and enters the cooling box through the return pipe to cool the cooling water in the cooling box. At the same time, it impacts the cooling water in the cooling box to evenly distribute the water temperature in the cooling box, ensuring that the plastic film is cooled evenly. The circulation impact component cooperates with the pneumatic cooling component to drive the blades in the blower to rotate while returning the cooling water;

[0015] 4. The first water pump extracts high-temperature cooling water, impacts the first impeller to rotate, and flows to the cooling box through the connecting pipe. The first impeller drives the first active bevel gear and a driven bevel gear to rotate, drives the first fan and the active pulley to rotate, drives the driven pulley to rotate through the synchronous belt, drives the second fan to rotate, and the first fan and the second fan blow wind to the cooling box and the heat dissipation fins to accelerate the cooling of the cooling water in the cooling box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present solution and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention.

[0017] Figure 1 This is a schematic diagram of the overall structure of a plastic film extrusion cooling device proposed by the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of a plastic film extrusion cooling device proposed by the present invention from another perspective;

[0019] Figure 3 This is a schematic cross-sectional structural diagram of the first rotating shell proposed by the present invention;

[0020] Figure 4 This is a schematic cross-sectional structural diagram of the second rotating shell proposed by the present invention;

[0021] Figure 5 for Figure 3 A is a schematic diagram of the enlarged structure of the middle part;

[0022] Figure 6 for Figure 4 Schematic diagram of the enlarged structure of B.

[0023] In the attached drawings: 1. cooling box, 2. cooling box, 3. first water pump, 4. second water pump, 5. extruder, 6. impact cooling assembly, 7. circulating impact assembly, 8. pneumatic cooling assembly, 9. first rotating shell, 10. support seat, 11. heat recovery copper pipe, 12. cooling frame, 13. guide frame, 14. conveyor roller, 15. heat dissipation fin, 601, first driving bevel gear, 602, first driven bevel gear, 603, driving pulley, 604, The first fan, 605, the driven pulley, 606, the second fan, 607, the synchronous belt, 608, the first impeller, 609, the connecting pipe, 701, the circulating water pipe, 702, the second rotating shell, 703, the second driving bevel gear, 704, the second driven bevel gear, 705, the return pipe, 706, the second impeller, 801, the diverter, 802, the diverter pipe, 803, the blowing pipe, 804, the blowing head, 805, the air collecting pipe, 806, the blower.

[0024] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Embodiment 1, as Figure 1-Figure 6As shown, a plastic film extrusion cooling device proposed in this scheme includes a cooling box 1, one side wall of the cooling box 1 is fixedly connected to a cooling box 2, one side wall of the cooling box 1 is fixedly connected to a first water pump 3, one side wall of the cooling box 2 is fixedly connected to a second water pump 4, an extrusion head 5 is arranged above the cooling box 2, a first rotating shell 9 is fixedly connected to the top wall of the cooling box 2, a heat recovery copper tube 11 is fixedly spirally wound on the circumferential wall of the extrusion head 5, one end of the heat recovery copper tube 11 is fixedly connected to the output end of the first water pump 3, and the other end of the heat recovery copper tube 11 is fixedly connected to the output end of the first water pump 3. Connected to the input end of the first rotating shell 9, the outer wall of the cooling box 2 is fixedly connected with a heat dissipation fin 15 in a transverse linear array, the side wall of the cooling box 1 is fixedly connected with a guide frame 13, the inner wall of the cooling box 1 is symmetrically rotatably connected with a conveying roller 14, the top of the cooling box 2 is fixedly connected with a cooling frame 12, and one side wall of the cooling box 1 is fixedly connected with a support seat 10, the first rotating shell 9 is rotatably connected with an impact cooling component 6, and the support seat 10 is rotatably connected with a circulating impact component 7, and one side wall of the cooling box 1 is fixedly connected with a pneumatic cooling component 8, the pneumatic The dynamic cooling component 8 is fixedly connected to the circulation impact component 7, and the circulation impact component 7 includes a circulation water pipe 701 fixedly connected to the output end of the second water pump 4, a second rotating shell 702 rotatably connected to one side wall of the cooling box 1 in a transverse linear array, and a second driven bevel gear 704 rotatably connected to the bottom wall of the support seat 10 in a transverse linear array. The bottom of the circumferential wall of the second rotating shell 702 is fixedly connected to a return pipe 705, and the other end of the return pipe 705 is fixedly connected to the cooling box 1. The inner wall of the second rotating shell 702 is rotatably connected to a second impeller 706. A second active bevel gear 703 is rotatably connected to one side wall of the second rotating shell 702. The second active bevel gear 703 is coaxially fixedly connected to the second impeller 706. The second active bevel gear 703 meshes with the second driven bevel gear 704. The second water pump 4 extracts the cooled water in the cooling box 2. The water enters the second rotating shell 702 through the circulating water pipe 701 and impacts the second impeller 706. The impact of the water flow drives the second impeller 706 to rotate. The second impeller 706 drives the second active bevel gear 703 to rotate, and drives the second driven bevel gear 704 to rotate.

[0027] like Figure 1-Figure 4As shown, the pneumatic cooling component 8 includes a diverter 801 fixedly connected to a side wall of the cooling box 1, and a side wall of the diverter 801 is fixedly connected to a wind collecting pipe 805, and a blower 806 is fixedly connected to the top of the circumferential wall of the wind collecting pipe 805 in a transverse linear array, and a blade is rotatably connected to the blower 806, and the blade is coaxially fixedly connected to the second driven bevel gear 704, and the top wall of the diverter 801 is symmetrically fixedly connected to the diverter pipe 802, and one side of the top wall of the cooling box 1 is symmetrically fixedly connected to the blowing pipe 803, and one end of the blowing pipe 803 is connected to the diverter pipe 80 2 The other end is fixedly connected, and a longitudinal linear array is fixedly connected to one side of the circumferential wall of the blowing pipe 803 with a blowing head 804, and the blowing heads 804 on both sides are arranged oppositely. The second driven bevel gear 704 drives the blades in the blower 806 to rotate, and the external air is drawn into the blower 806 and blown into the air collecting pipe 805. The diameter of the air collecting pipe 805 is small. The air collecting pipe 805 blows the air to the diverter 801, blows it to the blowing pipe 803 through the diverter pipe 802, and blows it out through the oppositely arranged blowing heads 804, so as to cool the two sides of the plastic film and dry the moisture on the surface of the plastic film.

[0028] like Figure 1-Figure 5As shown, the impact cooling component 6 includes a first driven bevel gear 602 rotatably connected to the bottom wall of the cooling frame 12 and a first impeller 608 rotatably connected to the inner wall of the first rotating shell 9, a connecting pipe 609 is fixedly connected to the bottom side of the circumferential wall of the first rotating shell 9, and the other end of the connecting pipe 609 is fixedly connected to the cooling box 2, a first driving bevel gear 601 is rotatably connected to one side wall of the first rotating shell 9, the first driving bevel gear 601 is coaxially fixedly connected to the first impeller 608, the first driving bevel gear 601 meshes with the first driven bevel gear 602, the top wall of the cooling frame 12 is rotatably connected to a driving pulley 603, the driving pulley 603 is coaxially fixedly connected to the first driven bevel gear 602, and the bottom wall of the first driven bevel gear 602 is coaxially fixedly connected to a first fan 604; the impact cooling component 6 also includes a driven pulley 605 rotatably connected to the top wall of the cooling frame 12 in a longitudinal linear array, and the driven pulley 605 is arranged at On both sides of the driving pulley 603, the bottom wall of the cooling frame 12 is rotatably connected with a second fan 606, the second fan 606 is arranged on both sides of the first fan 604, the second fan 606 is coaxially fixedly connected with the driven pulley 605, and the driven pulley 605 and the driving pulley 603 on both sides are sleeved with a synchronous belt 607, the first water pump 3 extracts water in the cooling box 1 and flows to the heat recovery copper pipe 11, the hot water preheats the extruder head 5 through the heat recovery copper pipe 11, and dissipates heat at the same time, flows to the first rotating shell 9, impacts the first impeller 608, the water flows to the cooling box 2 through the connecting pipe 609, heat conduction is carried out between the cooling fins 15 and the cooling box 2, and then the water is cooled, the water impacts the first impeller 608 to rotate, drives the first driving bevel gear 601 to rotate, drives the driving pulley 603 and the first fan 604 to rotate, drives the driven pulley 605 and the second fan 606 to rotate through the synchronous belt 607, and then cools the cooling fins 15.

[0029] The device is placed in a suitable position, the extruder head 5 extrude the plastic film, and transmits it through the conveyor roller 14 and the guide frame 13. At the same time, the plastic film passes through the blowing pipes 803 and the blowing head 804 on both sides, and the plastic film is cooled in the cooling box 1. The first water pump 3 and the second water pump 4 are started, and the hot water in the cooling box 1 is extracted to the heat recovery copper pipe 11. The hot water recovers the heat to the extruder head 5 through the heat recovery copper pipe 11, and the extruder head 5 is preheated. At the same time, the heat of the water is conducted out for cooling. The water flows to the first rotating shell 9, and the water impacts the first impeller 608, driving the first impeller 608 to rotate. The water flows to the cooling shell through the connecting pipe 609. The cooling box 2 is connected to the heat sink 15, and the heat conduction is carried out between the heat sink 15 and the cooling box 2, and then the water is cooled. The first impeller 608 drives the first active bevel gear 601 to rotate, and then drives the first driven bevel gear 602 to rotate, drives the active pulley 603 and the first fan 604 to rotate, and the active pulley 603 drives the driven pulley 605 to rotate through the synchronous belt 607, and the driven pulley 605 drives the second fan 606 to rotate. The first fan 604 and the second fan 606 blow air to the heat sink 15 to improve the heat dissipation efficiency of the heat sink 15. The second water pump 4 is started to pump the cooled cold water in the cooling box 2 to the circulating water pipe 701. The cold water flows to the second rotating shell 702, and the cold water impacts the second impeller 706, driving the second impeller 706 to rotate, and flows to the cooling box 1 through the return pipe 705, impacting the cooling water in the cooling box 1. The cooling water in the cooling box 1 is stirred by the impact of the water flow, so that the water temperature in the cooling box 1 and the cooling box 2 is evenly distributed, and the cooling water in the cooling box 1 and the cooling box 2 is circulated to achieve the circulation and cooling of the cooling water, and the cooling efficiency of the water is improved by blowing. The second impeller 706 drives the second active bevel gear 703 to rotate, drives the second driven bevel gear 704 to rotate, and drives the blades in the blower 806 to rotate. , external air is drawn into the blower 806, and is guided by the blower 806 to blow into the air collecting pipe 805. The air collecting pipe 805 has a small diameter. The air collecting pipe 805 blows the air to the diverter 801, blows it to the blowing pipe 803 through the diverter pipe 802, and blows it out through the relatively arranged blowing head 804, so as to cool both sides of the plastic film and dry the moisture on the surface of the plastic film at the same time. The air flow is blown to the surface of the plastic film, and the plastic film blocks the air flow, so that the air flow diffuses around the plastic film, and the scattered wind blows to the cooling water on the surface of the cooling box 1. While the plastic film is evenly dried, the cooling water on both sides of the plastic film is cooled. The water flowing out of the reflux pipe 705 impacts and stirs the water in the cooling box 1, so that the water temperature in the cooling box 1 and the cooling box 2 is more uniform.

[0030] The present invention and its implementation methods are described above, which is not restrictive. The drawings only describe one implementation method of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A plastic film extrusion cooling device, comprising a cooling box (1), characterized in that: A cooling box (2) is fixedly connected to one side wall of the cooling box (1), a first water pump (3) is fixedly connected to one side wall of the cooling box (1), a second water pump (4) is fixedly connected to one side wall of the cooling box (2), an extrusion head (5) is arranged above the cooling box (2), a first rotating shell (9) is fixedly connected to the top wall of the cooling box (2), a heat recovery copper tube (11) is fixedly spirally wound on the upper circumferential wall of the extrusion head (5), one end of the heat recovery copper tube (11) is fixedly connected to the output end of the first water pump (3), and the other end of the heat recovery copper tube (11) is fixedly connected to the input end of the first rotating shell (9), and the outer wall of the cooling box (2) is transversely The linear array is fixedly connected to a heat dissipation fin (15); the side wall of the cooling box (1) is fixedly connected to a guide frame (13); the inner wall of the cooling box (1) is symmetrically rotatably connected to a conveying roller (14); the top of the cooling box (2) is fixedly connected to a cooling frame (12); one side wall of the cooling box (1) is fixedly connected to a support seat (10); an impact cooling component (6) is rotatably connected inside the first rotating shell (9); a circulating impact component (7) is rotatably connected to the support seat (10); a pneumatic cooling component (8) is fixedly connected to one side wall of the cooling box (1); and the pneumatic cooling component (8) is fixedly connected to the circulating impact component (7); The circulating impact assembly (7) comprises a circulating water pipe (701) fixedly connected to the output end of the second water pump (4), a second rotating shell (702) rotatably connected to a side wall of the cooling box (1) in a transverse linear array, and a second driven bevel gear (704) rotatably connected to the bottom wall of the support seat (10) in a transverse linear array, the bottom of the circumferential wall of the second rotating shell (702) being fixedly connected to a return pipe (705), the other end of the return pipe (705) being fixedly connected to the inside of the cooling box (1); The cyclic impact assembly (7) further comprises a second impeller (706) rotatably connected to the inner wall of the second rotating shell (702); a second active bevel gear (703) is rotatably connected to a side wall of the second rotating shell (702); the second active bevel gear (703) is coaxially fixedly connected to the second impeller (706); and the second active bevel gear (703) meshes with a second driven bevel gear (704); The pneumatic cooling component (8) comprises a flow divider (801) fixedly connected to a side wall of the cooling box (1), a side wall of the flow divider (801) being fixedly connected to an air collecting pipe (805), a horizontal linear array at the top of the circumferential wall of the air collecting pipe (805) being fixedly connected to a blower (806), a blade being rotatably connected inside the blower (806), and the blade being coaxially fixedly connected to the second driven bevel gear (704); The pneumatic cooling component (8) further comprises a flow divider pipe (802) symmetrically fixedly connected to the top wall of the flow divider (801); a blowing pipe (803) is symmetrically fixedly connected to one side of the top wall of the cooling box (1); one end of the blowing pipe (803) is fixedly connected to the other end of the flow divider pipe (802); a blowing head (804) is fixedly connected to one side of the circumferential wall of the blowing pipe (803) in a longitudinal linear array; the blowing heads (804) on both sides are arranged opposite to each other.

2. A plastic film extrusion cooling device according to claim 1, characterized in that: The impact cooling component (6) comprises a first driven bevel gear (602) rotatably connected to the bottom wall of the cooling frame (12) and a first impeller (608) rotatably connected to the inner wall of the first rotating shell (9); a connecting pipe (609) is fixedly connected to the bottom side of the circumferential wall of the first rotating shell (9); the other end of the connecting pipe (609) is fixedly connected to the cooling box (2); a first driving bevel gear (601) is rotatably connected to a side wall of the first rotating shell (9); the first driving bevel gear (601) is coaxially fixedly connected to the first impeller (608); the first driving bevel gear (601) meshes with the first driven bevel gear (602); a driving pulley (603) is rotatably connected to the top wall of the cooling frame (12); the driving pulley (603) is coaxially fixedly connected to the first driven bevel gear (602); and a first fan (604) is coaxially fixedly connected to the bottom wall of the first driven bevel gear (602).

3. A plastic film extrusion cooling device according to claim 2, characterized in that: The impact cooling assembly (6) further comprises a driven pulley (605) rotatably connected to the top wall of the cooling rack (12) in a longitudinal linear array, the driven pulley (605) being arranged on both sides of the driving pulley (603), a second fan (606) being rotatably connected to the bottom wall of the cooling rack (12), the second fan (606) being arranged on both sides of the first fan (604), the second fan (606) being coaxially fixedly connected to the driven pulley (605), and a synchronous belt (607) being sleeved on the driven pulley (605) and the driving pulley (603) on both sides.

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