Hot air circulation energy-saving system for film production

Abstract

The invention relates to the technical field of thin film production, in particular to a hot air circulation energy-saving system for thin film production. The conveying pipe I is communicated with the transverse pulling box body and is used for conveying hot air discharged from the transverse pulling box body; the filtering mechanism is used for filtering the hot air; the preheating mechanism is used for preheating inlet air of the transverse pulling box body; the heat exchange mechanism is used for cooling the hot air; the flow guide mechanism is used for controlling the trend of the hot air flowing out of the filtering mechanism; and a three-way valve. According to the hot air circulation energy-saving system for thin film production, by arranging the flow guide mechanism, the air flowing direction can be automatically controlled, then the temperature of a traction rolling cover body, the temperature of a slitting cover body, the temperature of an aging area, the temperature of a packaging area and the like are automatically adjusted, and energy consumption is reduced. Through cooperation of the flow guide mechanism, the heat exchange mechanism and the filtering mechanism, hot air circulation is achieved on the premise that the film stretching process requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of film production, and in particular to a hot air circulation energy-saving system for film production. Background Art

[0002] Biaxially oriented polypropylene film (BOPP) is made by melting polypropylene particles at high temperature, extruding, and quenching to form a sheet, and then stretching it in the longitudinal and transverse directions. The transverse stretching of the film is carried out in a transverse stretching box. The heater on the side or top of the transverse stretching box heats the air and blows it onto the film surface through the air duct through the fan. The stretching of the film in the transverse stretching box is divided into three stages: preheating, stretching, and shaping. The stretching temperature is usually between 160℃ and 180℃.

[0003] When the film is stretched horizontally, the hot air needs to be continuously discharged from the box and fresh air needs to be introduced to ensure the cleanliness of the air in the horizontal stretching box, and at the same time, the wind pressure and heat are dynamically balanced. However, in this process, the horizontal stretching hot air is directly discharged into the air after being processed, and the waste heat cannot be reasonably utilized, resulting in a large amount of heat energy waste.

[0004] In view of this, we propose a hot air circulation energy-saving system for film production. Summary of the invention

[0005] The purpose of the embodiment of the present invention is to provide a hot air circulation energy-saving system for film production, which solves the problem of heat energy waste in the front horizontal pull box.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A hot air circulation energy-saving system for film production, comprising a horizontally pulled box;

[0008] A conveying pipe 1 is connected to the horizontal pull box and is used to convey the hot air discharged from the horizontal pull box;

[0009] A filtering mechanism, used for filtering the hot air;

[0010] A preheating mechanism, used to preheat the air inlet of the horizontal pull box;

[0011] A heat exchange mechanism for cooling the hot air;

[0012] A flow guiding mechanism, used to control the direction of the hot air flowing out of the filtering mechanism;

[0013] And a three-way valve, one end of which is connected to the first delivery pipe, one end is connected to the preheating mechanism, and the other end is connected to the second delivery pipe, one end of which is connected to the filtering mechanism.

[0014] Furthermore, the flow guiding mechanism comprises a shell, a first air intake pipe, a first exhaust pipe, a second air intake pipe and a second exhaust pipe are connected in the shell, and one end of the first air intake pipe is connected to the filtering mechanism.

[0015] Furthermore, two partitions are fixedly connected in the shell, an air storage box is fixedly connected between the two partitions, a piston plate is slidably connected to the inner wall of the air storage box, and saturated steam is stored in the air storage box on both sides of the piston plate;

[0016] The partition plate is provided with two through holes, and the two sides of the piston plate are respectively fixedly connected with a first sealing plate and a second sealing plate through connecting rods for sealing the through holes on the surface of the partition plate.

[0017] Furthermore, the through holes on the two partitions are respectively hole one, hole two, hole three and hole four;

[0018] One end of the first sealing plate completely seals the second hole, and the other end seals half of the hole. The second sealing plate is provided with two through holes, one of which is completely staggered with the third hole, and the other through hole is half overlapped with the fourth hole.

[0019] Furthermore, both ends of the air storage box are made of heat-conducting material, and the middle section of the air storage box is made of heat-insulating material.

[0020] Further, the housing includes two first side plates and two second side plates, the first side plates are perpendicular to the second side plates, the first air intake pipe and the first exhaust pipe are rotatably mounted on the two first side plates, and the second air intake pipe and the second exhaust pipe are fixedly mounted on the two second side plates;

[0021] The second air inlet pipe and the second air outlet pipe are both provided with threaded joints on one end away from the shell.

[0022] Furthermore, the preheating mechanism includes a sleeve, to which a return air duct and a wind cabinet air inlet pipe are connected, one end of the wind cabinet air inlet pipe is connected to the horizontal pull box body, an inner tube is fixedly connected to the inside of the sleeve, the inner tube is connected to one end of the three-way valve, and the inner tube is connected to the second delivery pipe through a cooling pipe.

[0023] Furthermore, one end of the return air duct away from the sleeve is connected to the flow guide mechanism.

[0024] Furthermore, the filtering mechanism includes an electrostatic oil removal tower and an activated carbon adsorption tower, the input end of the electrostatic oil removal tower is connected to the second conveying pipe, the output end is connected to the activated carbon adsorption tower, and the output end of the activated carbon adsorption tower is connected to the first air inlet pipe.

[0025] Furthermore, the heat exchange mechanism includes a heat exchange box, which is fixedly mounted on the surface of the first air inlet pipe. The top of the heat exchange box is connected to a water inlet pipe, and the bottom is connected to a water outlet pipe. A water distribution plate is fixedly connected to the inner wall of the heat exchange box, and the water distribution plate is located above the first air inlet pipe.

[0026] By means of the above technical solution, the present invention provides a hot air circulation energy-saving system for film production, which has at least the following beneficial effects:

[0027] (1) The hot air circulation energy-saving system for film production can automatically control the gas flow direction by setting a guide mechanism, and then automatically adjust the temperature of the traction and winding cover, slitting cover, aging area and packaging area without heat source to reduce energy consumption. Through the coordinated cooperation of the guide mechanism, heat exchange mechanism and filtering mechanism, hot air circulation is realized under the premise of ensuring the requirements of the film stretching process, so that the waste heat of horizontal stretching can be efficiently recycled and energy consumption is reduced.

[0028] (2) The hot air circulation energy-saving system for film production can filter the oil and harmful substances in the hot air discharged from the horizontal pulling box by setting up an electrostatic oil removal tower and an activated carbon adsorption tower, ensuring the safety of the air intake of the traction and winding cover, the slitting cover, the aging area, and the packaging area. The temperature is controlled by saturated steam, with a short response time and high control accuracy. It can realize automatic gas guidance and improve the convenience of system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a hot air circulation structure according to an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of a preheating mechanism in an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of a filtering mechanism in an embodiment of the present invention;

[0034] Figure 5 Schematic diagram of a heat exchange mechanism in an embodiment of the present invention;

[0035] Figure 6 A side sectional view of a heat exchange box in an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of a flow guiding mechanism in an embodiment of the present invention;

[0037] Figure 8 is a cross-sectional view of a flow guiding mechanism in an embodiment of the present invention;

[0038] Fig. 9 It is an exploded view of the internal structure of the shell in an embodiment of the present invention.

[0039] In the figure: 1, horizontal pull box; 11, heat exhaust pipe; 12, heat exhaust valve; 2, delivery pipe 1; 3, three-way valve; 4, delivery pipe 2; 5, filtering mechanism; 51, electrostatic oil removal tower; 52, activated carbon adsorption tower; 6, preheating mechanism; 61, sleeve; 62, return air duct; 63, air cabinet air inlet pipe; 64, inner cylinder; 7, cooling pipe; 8, heat exchange mechanism; 81, heat exchange box; 82, water inlet pipe; 83, water distribution plate; 84, water outlet pipe; 9. flow guide mechanism; 91. shell; 9101. first side plate; 9102. second side plate; 92. first air inlet pipe; 93. first exhaust pipe; 94. second air inlet pipe; 95. second exhaust pipe; 96. partition; 9601. hole one; 9602. hole two; 9603. hole three; 9604. hole four; 97. air storage box; 98. piston plate; 99. first sealing plate; 910. second sealing plate; 911. retaining ring. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] When pulling horizontally, the horizontal pulling box needs to continuously discharge hot air and introduce fresh air to ensure the cleanliness of the air in the wind cabinet, and at the same time, make the wind pressure and heat reach a dynamic balance. In this process, the horizontal pulling hot air is directly discharged into the air after being processed, and the waste heat cannot be reasonably utilized, resulting in a large amount of heat energy waste.

[0042] On the film stretching production line, the film after horizontal stretching needs to go through the processes of traction, winding, aging, slitting, packaging, etc. in sequence. The film needs to maintain a certain process temperature during the traction, winding, aging, slitting, packaging and other links, so it is necessary to set up an additional heat source to keep the traction and winding cover, slitting cover, aging area and packaging area in a constant temperature environment. Especially in winter, the traction and winding cover, slitting cover, aging area and packaging area need to be heated by electric energy, which consumes a lot of electric energy and greatly increases production costs.

[0043] Therefore, please refer to Figure 1-Figure 9The present invention provides a hot air circulation energy-saving system for film production, which can introduce horizontal hot air into the traction and winding cover, the slitting cover, the aging area and the packaging area to solve the current problem of heat energy waste in the horizontal pulling box 1.

[0044] The hot air circulation energy-saving system for film production includes:

[0045] The horizontally pulled box body 1 is provided with a plurality of hot air exhaust outlets, each of which is connected to a heat exhaust pipe 11 , and a heat exhaust valve 12 is provided on the heat exhaust pipe 11 for controlling the exhaust of hot air in the horizontally pulled box body 1 .

[0046] The delivery pipe 2 is used to deliver hot air, and multiple heat exhaust pipes 11 are connected to the delivery pipe 2 to collect the hot air into the delivery pipe 2.

[0047] One end of the three-way valve 3 is connected to the delivery pipe 2.

[0048] The delivery pipe 2 4 is connected to one end of the three-way valve 3 .

[0049] The filtering mechanism 5 is connected to the end of the conveying pipe 2 4 away from the three-way valve 3 and is used to filter harmful substances in the hot air during the transverse stretching of the film.

[0050] The preheating mechanism 6 is connected to one end of the three-way valve 3 .

[0051] The cooling pipe 7 has one end connected to the preheating mechanism 6 and the other end connected to the conveying pipe 2 4 .

[0052] The heat exchange mechanism 8 is used to cool the hot air.

[0053] The flow guiding mechanism 9 is used to control the direction of the hot air flowing out of the filtering mechanism 5 .

[0054] Combination Figure 1 As shown, a plurality of heat exchange mechanisms 8 and flow guide mechanisms 9 can be provided, so as to introduce hot air into the traction and winding cover, the slitting cover, the aging area and the packaging area respectively.

[0055] Next, combine Figure 2 As shown, the specific structure of the hot air circulation system is described by taking the arrangement of a heat exchange mechanism 8 and a flow guide mechanism 9 as an example. In this example, the horizontal wind is introduced into the aging hall for circulation.

[0056] The three ports of the three-way valve 3 are respectively connected to the delivery pipe 1 2, the delivery pipe 2 4 and the preheating mechanism 6, and the preheating mechanism 6 is connected to the delivery pipe 2 4 through the cooling pipe 7. When the room temperature is low in winter, the hot air discharged from the horizontal pull box 1 is directly transported to the filtering mechanism 5 through the three-way valve 3 for filtration to reduce heat loss. When the room temperature is high in summer, the hot air discharged from the horizontal pull box 1 first passes through the three-way valve 3 to enter the preheating mechanism 6 for cooling, and then passes through the cooling pipe 7 and the delivery pipe 2 4 to enter the filtering mechanism 5 for filtration.

[0057] In this embodiment, the preheating mechanism 6 includes a sleeve 61, and the sleeve 61 is connected with a return air duct 62 and a wind cabinet air inlet duct 63. The end of the wind cabinet air inlet duct 63 away from the sleeve 61 is connected to the horizontal pull box 1. The return air duct 62 introduces external air into the sleeve 61 for heating. The heated air is input into the horizontal pull box 1 through the wind cabinet air inlet duct 63 to supplement the air volume lost in the horizontal pull box 1. The sleeve 61 is fixedly connected with an inner cylinder 64, which is connected to one end of the three-way valve 3. The inner cylinder 64 is connected to the delivery pipe 2 4 through the cooling pipe 7, so that the cooled hot air can be continuously delivered to the outside through the delivery pipe 2 4.

[0058] In this embodiment, the filtering mechanism 5 includes an electrostatic oil removal tower 51 and an activated carbon adsorption tower 52. By setting the electrostatic oil removal tower 51, the oil mist and particulate matter in the hot air can be removed, reducing the load of subsequent filtration. Subsequently, at least a two-stage activated carbon adsorption mode is adopted, using a honeycomb activated carbon module with an iodine value of ≥800mg / g, a thickness of 200mm, and a contact time of ≥0.5 seconds. It can adsorb more than 90% of VOCs and meet the safety and hygiene requirements of time-effective hall heating.

[0059] In this embodiment, the air guide mechanism 9 includes a shell 91, and the shell 91 includes two oppositely arranged first side plates 9101 and two oppositely arranged second side plates 9102, and the first side plates 9101 are perpendicular to the second side plates 9102. A cavity is provided inside the shell 91, and a first air intake pipe 92 and a first exhaust pipe 93 are rotatably connected to the inner wall of the shell 91, and the first air intake pipe 92 and the first exhaust pipe 93 respectively penetrate the two first side plates 9101 and communicate with the cavity. A second air intake pipe 94 and a second exhaust pipe 95 are fixedly connected to the inner wall of the shell 91, and the second air intake pipe 94 and the second exhaust pipe 95 respectively penetrate the two second side plates 9102 and communicate with the cavity.

[0060] One end of the first air inlet pipe 92 away from the shell 91 is in communication with the activated carbon adsorption tower 52 , so that the filtered gas can enter the interior of the shell 91 through the first air inlet pipe 92 .

[0061] The first exhaust pipe 93 is used to introduce the gas in the shell 91 into the aging hall for temperature regulation to save energy consumption required for temperature regulation.

[0062] The second air inlet pipe 94 is used to introduce the gas in the aging hall into the shell 91 to achieve air circulation inside and outside the aging hall.

[0063] The second exhaust pipe 95 is used to discharge the gas. The second exhaust pipe 95 is connected to the end of the return air pipe 62 away from the sleeve 61 and is used to re-input the clean air in the aging hall into the horizontal pull box 1.

[0064] Furthermore, two partitions 96 are fixedly connected in the shell 91, and the two ends of the partition 96 are respectively fixedly connected to the two first side plates 9101, and the upper and lower ends of the partition 96 are respectively fixedly connected to the inner top wall and the inner bottom wall of the shell 91, so that a closed space is formed between the two partitions 96. An air storage box 97 is fixedly connected between the two partitions 96, and a piston plate 98 is slidably connected to the inner wall of the air storage box 97. Saturated steam is stored in the air storage box 97 on both sides of the piston plate 98. When the temperature of one end of the air storage box 97 rises, the saturated steam on one side of the piston plate 98 will expand, thereby pushing the piston plate 98 to the other side.

[0065] The two partitions 96 have the same structure, and two through holes are provided on the partition 96, so that the space on both sides of the partition 96 is connected, and there is a gap between the partition 96 and the second side plate 9102, so that the gas can flow between the two partitions 96. There are four through holes, namely hole 1 9601, hole 2 9602, hole 3 9603 and hole 4 9604, wherein hole 1 9601 and hole 3 9603 are used to discharge the gas between the air storage box 97 and the first air inlet pipe 92, and hole 3 9603 and hole 4 9604 are used to discharge the gas between the air storage box 97 and the first exhaust pipe 93.

[0066] The first sealing plate 99 and the second sealing plate 910 are fixedly connected to both sides of the piston plate 98 through connecting rods. The first sealing plate 99 and the second sealing plate 910 are respectively fitted with two partitions 96 on opposite sides to seal the through holes on the surface of the partition 96. The partition 96 and the air storage box 97 are both provided with a sliding groove for the connecting rod to slide, so that the connecting rod can move left and right with the piston plate 98 and drive the first sealing plate 99 and the second sealing plate 910 to slide on the surface of the partition 96.

[0067] At room temperature, the air pressure on both sides of the piston plate 98 in the air storage box 97 is in a balanced state, and the piston plate 98 is located in the middle of the air storage box 97. At this time, one end of the first sealing plate 99 completely seals the second hole 9602, and the gas in the first exhaust pipe 93 cannot enter the second exhaust pipe 95 through the second hole 9602. The other end of the first sealing plate 99 semi-seals the first hole 9601, so that the gas in the first intake pipe 92 can enter the second exhaust pipe 95 through the second hole 9602. The semi-sealing can prevent the gas flow rate between the air storage box 97 and the first intake pipe 92 from being too fast, resulting in too fast heat loss, thereby affecting the heating speed of the air storage box 97. On the other hand, the second sealing plate 910 is provided with two through holes, one of which is completely staggered with the third hole 9603 to prevent the gas in the first air inlet pipe 92 from being discharged through the third hole 9603, and the other through hole is half overlapped with the fourth hole 9604, so that the gas in the second exhaust pipe 95 can enter the second air inlet pipe 94 through the fourth hole 9604. Through the cooperation of the above structures, the gas can flow normally when the temperature difference between the two ends of the air storage box 97 is not large.

[0068] Furthermore, both ends of the gas storage box 97 are made of heat-conducting materials, such as copper, to ensure that the gas in the gas storage box 97 changes with the temperature. The middle section of the gas storage box 97 is made of heat-insulating materials to reduce the mutual interference of the temperatures at both ends. By setting up the gas storage box 97, the temperature in the aging hall can be compared with the temperature of the hot air transported by the horizontal pull box 1, and the gas flow direction and flow volume can be automatically adjusted according to the temperature. If the temperature in the aging hall in winter is higher than the transport temperature, the hot air transported by the horizontal pull box 1 can automatically enter the aging hall. If the temperature in the aging hall is lower than the transport temperature, the piston plate 98 will move to the left, so that the gas flow direction inside and outside the aging hall changes. After the gas in the aging hall enters the shell 91 through the first exhaust pipe 93, it flows back into the aging hall through the second intake pipe 94, realizing self-circulation and reducing heat loss, and the hot air transported by the horizontal pull box 1 is directly discharged through the first exhaust pipe 93.

[0069] When the room temperature is high in summer, the housing 91 needs to be rotated 180 degrees around the first air inlet pipe 92 and the first exhaust pipe 93 so that the relative positions of the first sealing plate 99 and the second sealing plate 910 are replaced. At this time, if the temperature in the aging hall is lower than the delivery temperature, the air in the aging hall will be self-circulated. If the temperature in the aging hall is higher than the delivery temperature, low-temperature gas will be delivered into the aging hall to adjust the temperature in the aging hall.

[0070] As a preferred embodiment, a stop ring 911 is fixedly installed on the opposite end of the first intake pipe 92 and the first exhaust pipe 93, which is used to limit the relative movement between the first intake pipe 92 and the first exhaust pipe 93 and the shell 91, and prevent the first intake pipe 92 and the first exhaust pipe 93 from detaching from the shell 91.

[0071] The second air inlet pipe 94 and the second air outlet pipe 95 are both provided with threaded joints on one end away from the housing 91 for connecting with external pipelines to realize gas transportation.

[0072] In addition, the heat exchange mechanism 8 includes a heat exchange box 81, which is fixedly mounted on the surface of the first air inlet pipe 92. The top of the heat exchange box 81 is connected to a water inlet pipe 82, and the bottom is connected to a water outlet pipe 84. A water distribution plate 83 is fixedly connected to the inner wall of the heat exchange box 81. The water distribution plate 83 is located above the first air inlet pipe 92. A plurality of through holes are distributed in an array on the water distribution plate 83 to evenly distribute water and improve the heat exchange effect.

[0073] When the hot air circulation energy-saving system for film production of the present invention is in use, the high-temperature exhaust gas generated by the horizontal pulling box 1 is discharged through the heat exhaust pipe 11, and the hot air is transported to the three-way valve 3 through the conveying pipe 1 2. Then, it passes through the preheating mechanism 6 and the cooling pipe 7, enters the conveying pipe 2 4, and then passes through the electrostatic deoiling tower 51 and multiple activated carbon adsorption towers 52 for filtration.

[0074] Then the path is switched according to the season. In winter, the hot air directly enters the guide mechanism 9 (the piston plate 98 is driven by the temperature difference of the air storage box 97 to adjust the air flow direction) and is distributed to the aging hall for heating or directly refluxed. In summer, the hot air needs to be cooled by the heat exchange mechanism 8 before entering the aging hall or refluxed through the guide mechanism 9, thereby automatically adjusting the temperature of the aging hall and reducing energy consumption.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot air circulation energy-saving system for film production, characterized in that: include: Horizontally pull the box (1); A conveying pipe 1 (2), which is in communication with the horizontal pull box (1) and is used for conveying hot air discharged from the horizontal pull box (1); A filtering mechanism (5), used for filtering the hot air; A preheating mechanism (6) is used to preheat the air entering the horizontal pull box (1); A heat exchange mechanism (8) for cooling the hot air; A flow guiding mechanism (9) for controlling the direction of the hot air flowing out of the filtering mechanism (5); and a three-way valve (3), one end of the three-way valve (3) being connected to the first delivery pipe (2), one end being connected to the preheating mechanism (6), and the other end being connected to the second delivery pipe (4), one end of the second delivery pipe (4) being connected to the filtering mechanism (5).

2. The hot air circulation energy-saving system for film production according to claim 1, characterized in that: The flow guiding mechanism (9) comprises a shell (91), a first air intake pipe (92), a first air exhaust pipe (93), a second air intake pipe (94) and a second air exhaust pipe (95) are connected inside the shell (91), and one end of the first air intake pipe (92) is connected to the filtering mechanism (5).

3. The hot air circulation energy-saving system for film production according to claim 2, characterized in that: Two partitions (96) are fixedly connected inside the shell (91), an air storage box (97) is fixedly connected between the two partitions (96), a piston plate (98) is slidably connected to the inner wall of the air storage box (97), and saturated steam is stored on both sides of the piston plate (98) inside the air storage box (97); The partition plate (96) is provided with two through holes, and the two sides of the piston plate (98) are respectively fixedly connected with a first sealing plate (99) and a second sealing plate (910) via connecting rods, so as to seal the through holes on the surface of the partition plate (96).

4. The hot air circulation energy-saving system for film production according to claim 3 is characterized in that: The through holes on the two partitions (96) are respectively hole one (9601), hole two (9602), hole three (9603) and hole four (9604); One end of the first sealing plate (99) is completely sealed to hole two (9602), and the other end is semi-sealed to hole one (9601). The second sealing plate (910) is provided with two through holes, one of which is completely staggered with hole three (9603), and the other through hole semi-overlaps with hole four (9604).

5. The hot air circulation energy-saving system for film production according to claim 3, characterized in that: The two ends of the air storage box (97) are made of heat-conducting material, and the middle section of the air storage box (97) is made of heat-insulating material.

6. The hot air circulation energy-saving system for film production according to claim 1, characterized in that: The housing (91) comprises two first side plates (9101) and two second side plates (9102), the first side plates (9101) are perpendicular to the second side plates (9102), the first air intake pipe (92) and the first exhaust pipe (93) are rotatably mounted on the two first side plates (9101), and the second air intake pipe (94) and the second exhaust pipe (95) are fixedly mounted on the two second side plates (9102); The second air inlet pipe (94) and the second air outlet pipe (95) are both provided with threaded joints on their ends away from the housing (91).

7. The hot air circulation energy-saving system for film production according to claim 1, characterized in that: The preheating mechanism (6) comprises a sleeve (61), to which a return air duct (62) and a wind cabinet air inlet pipe (63) are connected, one end of the wind cabinet air inlet pipe (63) is connected to the horizontal pull box (1), an inner tube (64) is fixedly connected inside the sleeve (61), the inner tube (64) is connected to one end of the three-way valve (3), and the inner tube (64) is connected to the second conveying pipe (4) via a cooling pipe (7).

8. The hot air circulation energy-saving system for film production according to claim 7, characterized in that: One end of the return air pipe (62) away from the sleeve (61) is connected to the flow guide mechanism (9).

9. The hot air circulation energy-saving system for film production according to claim 1, characterized in that: The filtering mechanism (5) comprises an electrostatic oil removal tower (51) and an activated carbon adsorption tower (52); the input end of the electrostatic oil removal tower (51) is connected to the second conveying pipe (4), and the output end is connected to the activated carbon adsorption tower (52); the output end of the activated carbon adsorption tower (52) is connected to the first air inlet pipe (92).

10. The hot air circulation energy-saving system for film production according to claim 1, characterized in that: The heat exchange mechanism (8) comprises a heat exchange box (81), the heat exchange box (81) being fixedly sleeved on the surface of the first air inlet pipe (92), the top of the heat exchange box (81) being connected to a water inlet pipe (82), and the bottom being connected to a water outlet pipe (84), and a water distribution plate (83) being fixedly connected to the inner wall of the heat exchange box (81), and the water distribution plate (83) being located above the first air inlet pipe (92).

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