A plastic film production film blowing cooling device

Abstract

This utility model discloses a blowing film cooling device for plastic film production, including a base, a blower box, and a water tank. A bracket is fixedly installed on the top of the base. The blower box is horizontally fixedly installed on the upper inner side of the bracket. A fan frame is fixedly installed inside the blower box, and several sets of fans are installed inside the fan frame. A water guide channel is fixedly installed at the bottom of the blower box. Air inlets are horizontally opened on the lower front and rear sides of the blower box, and the air inlets are located below the fan frame. A top cover is provided on the top of the blower box. A water tank is fixedly installed in the center of the top of the base. Output pipes and return pipes are respectively provided at both ends of the water tank. Water inlets and outlets are respectively provided at both ends of the water guide channel, and output pipes and return pipes are respectively connected to the water inlets and outlets. This utility model solves the problems of low cooling efficiency, poor uniformity, and difficult maintenance of traditional cooling devices through the synergistic effect of water cooling and air cooling, optimized fluid path design, and convenient maintenance structure, achieving efficient, stable, and energy-saving blowing film cooling.

Description

Technical Field

[0001] This utility model relates to the field of plastic film production technology, and in particular to a blown film cooling device for plastic film production. Background Technology

[0002] In the field of plastic film production, blown film technology is an important method for preparing plastic films. Its core lies in blowing molten plastic into a film using an extruder and then cooling and shaping it into the final product. The efficiency and uniformity of the cooling process directly affect the physical properties, production speed, and energy consumption costs of the plastic film. However, traditional blown film cooling equipment generally suffers from the following technical bottlenecks:

[0003] Traditional air-cooling devices rely on natural air convection or forced airflow from fans, resulting in low cooling efficiency and difficulty in meeting the demands of high-speed production. Furthermore, uneven airflow distribution can lead to insufficient cooling of plastic films in certain areas, causing instability or differences in crystallinity in the film bubbles.

[0004] While water cooling devices can remove heat through water flow, improper water flow path design can easily lead to localized overheating or overcooling, and direct contact between water and plastic film may cause contamination or defects on the film surface.

[0005] Therefore, how to provide a blowing film cooling device for plastic film production is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] One objective of this invention is to provide a blowing film cooling device for plastic film production. This invention can solve the problems of low cooling efficiency, poor uniformity, and difficult maintenance of traditional cooling devices through the synergistic effect of water cooling and air cooling, optimized fluid path design, and convenient maintenance structure, thereby achieving efficient, stable, and energy-saving blowing film cooling.

[0007] A plastic film blowing cooling device according to an embodiment of the present invention includes a base, a wind box, and a water tank;

[0008] A bracket is fixedly installed on the top of the base. The air box is horizontally fixedly installed on the upper inner side of the bracket. A fan frame is fixedly installed inside the air box, and several sets of fans are installed inside the fan frame. A water guide channel is fixedly installed at the bottom of the air box. Air inlets are horizontally opened on the lower front and rear sides of the air box, and the air inlets are located below the fan frame. A top cover is provided on the top of the air box. A water tank is fixedly installed in the center of the top of the base. An output pipe and a return pipe are respectively provided at both ends of the water tank. A water inlet and a water outlet are respectively provided at both ends of the water guide channel. The output pipe and the return pipe at both ends are respectively connected to the water inlet and the water outlet.

[0009] Furthermore, a water pump is installed on one side of the water tank and connected to the output pipe, and the input end of the water pump is connected to the inside of the water tank.

[0010] Furthermore, the upper cover has several sets of air outlets arranged horizontally inside, and each set of air outlets is arranged in parallel inside the upper cover.

[0011] Furthermore, magnetic frames are attached to the front and rear sides of the air box and to the outside of the air inlet, and a filter screen is installed inside the magnetic frames.

[0012] Furthermore, the water guide channel is provided with multiple sets of guide channels inside, and the multiple sets of guide channels are arranged in parallel inside the water guide channel.

[0013] Furthermore, a water inlet is fixedly installed on one side of the top of the water tank, and the water inlet is connected to the inside of the water tank.

[0014] Furthermore, the output pipe and return pipe pass through the two side supports respectively and are then connected and fixed to the inlet and outlet.

[0015] Furthermore, multiple sets of fans are installed equidistantly inside the air box, with each set of fans taking in air from the bottom and blowing air from the top.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model uses a water pump to transport water from the water tank to the water guide channel, and the water circulates within the water guide channel. At this time, the cooling water in the water guide channel reduces the temperature at the bottom of the air box through heat conduction, pre-cooling the air drawn in by the fan. The fan blows the low-temperature air toward the blown film, achieving rapid cooling through convection heat exchange. Compared with a single cooling method, the dual cooling mechanism greatly improves the heat exchange efficiency, significantly shortens the cooling time of the plastic film, and improves production efficiency.

[0018] 2. This utility model extends the flow path of cooling water and enhances turbulence by arranging the guide channels inside the water guide channel in parallel, making the cooling of the bottom of the air box more uniform. The air outlet is composed of multiple sets of parallel strip holes, which are distributed at equal intervals with the fan to ensure that the low-temperature airflow evenly covers the blown film surface. This avoids quality defects such as deformation, wrinkles or inconsistent crystallinity of plastic film caused by uneven local temperature, thereby improving the product qualification rate. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a blown film cooling device for plastic film production proposed in this utility model;

[0021] Figure 2 This is a side view of a blown film cooling device for plastic film production proposed in this utility model.

[0022] Figure 3 This is a schematic diagram of the disassembled structure of the blower box in a blown film cooling device for plastic film production proposed in this utility model;

[0023] Figure 4 This is a schematic diagram of the water guide channel structure of a blown film cooling device for plastic film production proposed in this utility model.

[0024] In the diagram: 1. Base; 2. Bracket; 3. Air box; 4. Top cover; 5. Water tank; 6. Water pump; 7. Output pipe; 8. Return pipe; 9. Water guide channel; 10. Fan bracket; 11. Fan; 12. Air inlet; 13. Magnetic frame; 14. Filter screen; 15. Air outlet; 16. Flow guide channel; 17. Water inlet; 18. Water outlet; 19. Water filling port. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0026] Example 1

[0027] refer to Figures 1-4 A plastic film blowing and cooling device includes a base 1, a wind box 3 and a water tank 5;

[0028] The base 1 is a horizontal support structure, and its top is fixed with symmetrical brackets 2 by bolts. The brackets 2 are made of channel steel and have a vertical mounting surface on the inside.

[0029] The bellows 3 is horizontally fixed to the upper inner side of the bracket 2 and is connected to the bracket 2 by welding or bolts. The bellows 3 is a rectangular hollow structure, and the internal space is used to install the fan assembly.

[0030] Inside the air box 3, a fan frame 10 is welded and fixed. The fan frame 10 is a mesh metal frame on which several sets of fans 11 are installed at equal intervals. Each set of fans 11 is an axial flow fan, which draws air in from the bottom and blows air out from the top, forming an airflow from bottom to top.

[0031] The air box 3 has horizontal air inlets 12 on the lower front and rear sides. The air inlets 12 are located below the fan frame 10 and are used to introduce outside air. The width of the air inlets 12 is the same as the width of the inner cavity of the air box 3 to ensure that the air enters evenly.

[0032] Secondly, a water guide trough 9 is fixedly installed at the bottom of the bellows 3. The water guide trough 9 is a long strip-shaped trough with an inlet 17 and an outlet 18 at its two ends.

[0033] The water tank 5 is fixed in the center at the top of the base 1 and is fastened to the base 1 by anchor bolts. The water tank 5 is made of stainless steel and has good corrosion resistance.

[0034] The water tank 5 is connected to the output pipe 7 and the return pipe 8 at both ends by flanges. After passing through the bracket 2, the output pipe 7 and the return pipe 8 are sealed to the inlet 17 and outlet 18 of the water guide trough 9 by pipe joints.

[0035] Secondly, a water pump 6 is installed on one side of the water tank 5. The input end of the water pump 6 is connected to the inside of the water tank 5 through a pipe, and the output end is connected to the output pipe 7. When the water pump 6 is working, it pressurizes the cooling water in the water tank 5 and delivers it to the water guide channel 9. After flowing in the water guide channel 9, the cooling water returns to the water tank 5 through the return pipe 8, forming a circulating cooling.

[0036] It is worth mentioning that the top of the air box 3 is covered with a cover 4, which is fixed to the air box 3 by bolts. Several sets of air outlets 15 are opened horizontally inside the cover 4. The air outlets 15 are arranged in parallel, and the direction of the air outlets 15 is consistent with the direction of travel of the plastic film, so as to ensure that the cooling airflow is evenly applied to the blown film surface.

[0037] In this embodiment, by starting the water pump 6, the cooling water in the water tank 5 enters the water guide trough 9 through the output pipe 7 to cool the bottom of the air box 3. At the same time, the fan 11 starts, and the outside air enters the air box 3 from the air inlet 12. After passing through the cooled area of ​​the water guide trough 9, it is cooled down to form a low-temperature airflow, which is finally blown towards the blown film through the air outlet 15 to achieve synergistic cooling of air cooling and water cooling.

[0038] Example 2

[0039] refer to Figure 4 Based on Embodiment 1, this embodiment improves the internal structure of the water guide trough 9 to enhance cooling efficiency. The water guide trough 9 is provided with multiple sets of guide channels 16. Each set of guide channels 16 is arranged in parallel and is consistent with the length direction of the water guide trough 9. The guide channel 16 is a semi-cylindrical groove with a cross-sectional diameter of 2-5 cm and a height of 1 / 3-1 / 2 of the depth of the water guide trough 9.

[0040] The number of guide channels 16 is set according to the length of the guide channel 9. The spacing between adjacent guide channels 16 is 1-3 cm. The setting of guide channels 16 increases the flow path of cooling water, prolongs the contact time between cooling water and the air box 3, and enhances the turbulence of water flow, thereby improving heat exchange efficiency.

[0041] Secondly, a flow regulating valve is installed on the output pipe 7, which can adjust the flow rate of cooling water according to production needs. The structure of the guide groove 16 makes the water flow uniformly distributed in the guide groove 9, avoiding local water flow that is too fast or too slow, and ensuring the cooling uniformity of the entire bottom of the air box 3.

[0042] In this embodiment, the flow state of cooling water in the water guide channel 9 is optimized by the design of the guide channel 16, and the heat exchange efficiency is improved by 20%-30%, thereby improving the uniformity and efficiency of blown film cooling.

[0043] Example 3

[0044] refer to Figure 3 Based on Embodiment 1, this embodiment improves the filter structure of the air inlet 12 to enhance the reliability and ease of maintenance of the device.

[0045] Magnetic frames 13 are attached to the front and rear sides of the air box 3 and to the outside of the air inlet 12. The magnetic frames 13 are rectangular metal frames with permanent magnets embedded in their inner edges, which can be tightly attached to the metal surface of the air box 3.

[0046] A filter screen 14 is fixedly installed inside the magnetic frame 13 via a slot. The filter screen 14 is a detachable polypropylene filter screen with a mesh size of 80-120 mesh, which can effectively filter dust and impurities in the air and prevent the fan 11 and the water guide 9 from becoming clogged.

[0047] When the filter screen 14 needs to be cleaned or replaced, simply pull the magnetic frame 13 outwards and use the attraction force of the permanent magnet to quickly disassemble it. The cleaned filter screen 14 can be reinstalled back into the magnetic frame 13. The operation is simple and reduces downtime maintenance time.

[0048] In this embodiment, the design of the magnetic frame 13 and the filter screen 14 enables convenient maintenance of the air filter, extends the service life of the fan 11 and the water guide 9, and ensures the cleanliness of the cooling airflow.

[0049] Example 4

[0050] refer to Figure 3 Based on Embodiment 1, this embodiment optimizes the structure of the air outlet 15 to improve the uniformity of cooling airflow.

[0051] The upper cover 4 has several sets of air outlets 15 horizontally opened inside, and each set of air outlets 15 consists of multiple parallel strip holes. The width of the strip holes is 5-10 mm, and the length is the same as the width of the upper cover 4.

[0052] The spacing between each set of air outlets 15 is 10-20 mm, and the direction of the air outlets 15 is at an angle of 30°-60° to the direction of travel of the plastic film, so that the cooling airflow blows onto the film surface at a certain angle, thereby enhancing the coverage and uniformity of the airflow.

[0053] Secondly, an airflow guide plate can be further installed inside the air outlet 15. The guide plate is a thin metal plate with an adjustable angle, used to guide the airflow direction and ensure that the airflow acts evenly on different positions of the blown film.

[0054] In this embodiment, by optimizing the structure and angle of the air outlet 15, the cooling airflow is more evenly distributed on the blown film surface, avoiding the problem of local overheating or underheating, and improving the cooling quality of the plastic film.

[0055] Working Principle: First, the operator turns on the power and starts the water pump 6 and fan 11. At this time, the water pump 6 begins to draw cooling water from the water tank 5, and the fan 11 starts to rotate, forming an upward airflow. The cooling water in the water tank 5 is pressurized by the water pump 6 and delivered to the inlet 17 of the water guide trough 9 through the output pipe 7. The cooling water flows in the guide channel 16 inside the water guide trough 9. The parallel design of the guide channel 16 extends the water flow path and enhances the heat exchange efficiency with the bottom of the air box 3 through the turbulence effect. After absorbing the heat from the bottom of the air box 3, the temperature of the cooling water rises, and then it returns to the water tank 5 through the outlet 18 and the return pipe 8, completing the closed loop. During this process, the temperature of the bottom of the air box 3 is continuously reduced, providing a low-temperature environment for subsequent air cooling. Outside air enters from the air inlets 12 on the front and rear sides of the air box 3. The filter screen 14 on the outside of the air inlet 12 filters dust and impurities in the air, ensuring... The airflow is clean. When the air entering the air box 3 flows above the water guide trough 9, the temperature of the bottom of the air box 3 is reduced after being cooled, forming low-temperature air. The fan 11 draws the low-temperature air upward in a bottom-intake and top-blowing manner. The air is evenly accelerated through the grid structure of the fan frame 10. The accelerated airflow is blown out through the air outlet 15 in the upper cover 4. The parallel strip hole design of the air outlet 15 ensures that the airflow evenly covers the blown film surface. The cooling water continuously circulates between the water tank 5, the output pipe 7, the water guide trough 9 and the return pipe 8, continuously absorbing the heat of the air box 3 and dissipating it through the water tank 5.

[0056] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A blown film cooling device for plastic film production, characterized in that, Includes a base (1), a bellows (3), and a water tank (5); The base (1) is fixedly mounted with a bracket (2) on top. The air box (3) is fixedly mounted horizontally on the upper inner side of the bracket (2). The air box (3) is fixedly mounted with a fan frame (10) inside. The fan frame (10) is equipped with several sets of fans (11). The bottom of the air box (3) is fixedly mounted with a water guide channel (9). The air box (3) has horizontal air inlets (12) on the lower front and rear sides, and the air inlets (12) are located below the fan frame (10). The air box (3) is equipped with a top cover (4). The base (1) is fixedly mounted with a water tank (5) in the center of the top. The water tank (5) is equipped with an output pipe (7) and a return pipe (8) at both ends. The water guide channel (9) is equipped with an inlet (17) and an outlet (18) at both ends. The output pipe (7) and the return pipe (8) at both ends are connected to the inlet (17) and the outlet (18) respectively.

2. The plastic film blowing and cooling device according to claim 1, characterized in that, A water pump (6) is installed on one side of the water tank (5) and connected to the output pipe (7). The input end of the water pump (6) is connected to the inside of the water tank (5).

3. The plastic film blowing and cooling device according to claim 1, characterized in that, The upper cover (4) has several sets of air outlets (15) arranged horizontally inside, and each set of air outlets (15) is arranged in parallel inside the upper cover (4).

4. The plastic film blowing and cooling device according to claim 1, characterized in that, The air box (3) is equipped with magnetic frames (13) on both sides of the front and rear sides and outside the air inlet (12), and a filter screen (14) is provided inside the magnetic frames (13).

5. A blown film cooling device for plastic film production according to claim 1, characterized in that, The water guide channel (9) is provided with multiple sets of guide channels (16), and the multiple sets of guide channels (16) are arranged in parallel inside the water guide channel (9).

6. A blown film cooling device for plastic film production according to claim 1, characterized in that, A water inlet (19) is fixedly installed on one side of the top of the water tank (5), and the water inlet (19) is connected to the inside of the water tank (5).

7. A blown film cooling device for plastic film production according to claim 1, characterized in that, The output pipe (7) and return pipe (8) pass through the two side supports (2) respectively and are then connected and fixed to the inlet (17) and outlet (18).

8. A blown film cooling device for plastic film production according to claim 1, characterized in that, Multiple sets of fans (11) are installed equidistantly inside the air box (3), and each set of fans (11) has air intake at the bottom and air blowing at the top.

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