Film casting machine

Abstract

The present invention relates to the technical field of film forming, and specifically to a film casting machine, comprising an equipment main body, an extrusion piece installed on the equipment main body, an extrusion die head arranged inside the extrusion piece, a plurality of cooling rollers rotatably connected inside the equipment main body, and a plurality of water chambers are arranged, when cooling water is injected into the water pipe, the plurality of water chambers can be quickly filled through the liquid outlet channel to exchange heat with the cooling rollers, and the synchronous heat exchange of the plurality of water chambers can effectively avoid the phenomenon of uneven cooling when the cooling rollers cool the molten material, so that the molten material can be quickly formed into a film, and through the arrangement of a heat exchange head, while the water pipe passes the cooling material into the water chamber through the liquid outlet channel for cooling, a part of the cooling water will enter the inside of a side cooling chamber, and the cooling water in the water chamber will be heat exchanged by the heat exchange head, so that the cooling and heat exchange effect of the cooling water in the water chamber is better.

Description

Technical Field

[0001] The invention relates to the technical field of film forming, in particular to a film casting machine. Background Art

[0002] Film casting machine is a kind of equipment specially used for producing plastic film and sheet, which is widely used in packaging, printing, agriculture and other industries. Its working principle mainly includes raw material preparation, melt extrusion, casting, cooling and curing, and winding. According to different classification standards, film casting machine can be divided into many types. For example, according to the number of extruders, it can be divided into single-layer casting machine and multi-layer co-extrusion casting machine; according to the application field, it can be divided into food packaging film casting machine, agricultural film casting machine, medical packaging film casting machine, etc.

[0003] In order to ensure that the extruded molten material can be quickly formed, a cooling roller is usually required to cool the molten material so that it can be formed into a film. However, the cooling rollers in existing cast-film machines are generally cylindrical hollow cavities with sealed ends made of metal. When injecting cooling water into the cooling rollers, the cooling water is usually injected from one side and flows out from the other side. This causes the cooling water to exchange heat with one side of the cooling roller and then flow to the other side for heat exchange. The heat exchange effect is definitely reduced, so that the temperature of one end of the cooling roller is higher than that of the other end, and the roller wall has a temperature slope, which affects the forming of the entire film. In addition, the cooling rollers in existing cast-film machines usually do not have a filtering mechanism inside. The metal parts in the cooling water system may corrode after long-term operation, producing corrosion products such as metal oxides. These products may exist in the cooling water pipe in the form of particles or small pieces and be carried by the cooling water. If they are not filtered, these metal impurities may cause the cooling pipe to be blocked, thereby affecting the cooling effect of the cooling roller, thereby causing the film to fail to form. Summary of the invention

[0004] The purpose of the present invention is to provide a film casting machine to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a film casting machine comprises an equipment main body, an extrusion piece is installed on the equipment main body, an extrusion die head is arranged inside the extrusion piece, a plurality of cooling rollers are rotatably connected inside the equipment main body, a top box is installed on the equipment main body, connecting rods are arranged at both ends of the cooling roller, a water pipe is arranged inside the cooling roller, a plurality of water cavities are arranged inside the cooling roller, a plurality of liquid outlet channels are arranged inside the plurality of water cavities, a plurality of liquid outlet channels are connected to the inside of the water pipe, a plurality of side cooling chambers are arranged inside the plurality of water cavities, a plurality of side cooling chambers are arranged inside the plurality of side cooling chambers, a circulation hole is opened inside the plurality of side cooling chambers, a heat conducting fin is installed inside the circulation hole, a heat exchanging head is arranged at the end of the heat conducting fin, the heat exchanging head is located inside the water cavity, and a cooling mechanism is arranged on the inner side wall of the side cooling chamber.

[0006] Preferably, the cooling mechanism comprises a slide groove provided on the inner wall of the side cooling chamber, the inner wall of the slide groove is slidably connected with a counterweight, the outer wall of the counterweight is provided with a bubble making plate, and the bubble making plate is hollowed out.

[0007] Preferably, slide rails are provided on both sides of the water pipe, the inner wall of the slide rails is slidably connected to a filter plate, an elastic rod is provided inside the slide rails, the other end of the elastic rod is fixedly connected to the outer wall of the filter plate, and a cleaning mechanism is provided on the filter plate.

[0008] Preferably, the cleaning mechanism comprises a water wheel rotatably connected to the outer side wall of the filter plate, a plurality of blades are fixedly connected to the water wheel, a cleaning plate is fixedly connected to the outer side wall of the water wheel, and a scraper is slidably connected to the inner side wall of the cleaning plate.

[0009] Preferably, a plurality of tension springs are fixedly connected inside the cleaning plate, the other ends of the plurality of tension springs are fixedly connected to the scraper, and a pressing magnet is fixedly connected to the outer side wall of the scraper.

[0010] Preferably, side rods are fixedly connected to the outer walls of multiple side cooling chambers close to the filter plate, and the side rods penetrate into the interior of the water pipe. Contact magnetic blocks are provided on the side rods, and the magnetic poles of the contact magnetic blocks are the same as the magnetic poles of the pressing magnet.

[0011] Preferably, the interior of the water pipe is connected to a dirt storage box, a one-way pipe is provided inside the dirt storage box, a dirt storage pull-out box is slidably provided at the bottom of the one-way tube, the dirt storage pull-out box slides through to the outside of the cooling roller, a filter is provided inside the dirt storage pull-out box, the interior of the dirt storage box is connected to a water pipe, and the other end of the water pipe is connected to the inside of a liquid outlet channel adjacent thereto.

[0012] Preferably, multiple liquid extraction pipes are arranged between the multiple water chambers, and the interiors of the multiple liquid extraction pipes are connected with branch pipes, and the multiple branch pipes are respectively located inside the multiple water chambers, and the interiors of the multiple liquid extraction pipes are connected with water extraction pipes, and one end of the water extraction pipe away from the liquid extraction pipe is connected to the interior of the side cooling chamber.

[0013] Preferably, a circulation pipe is provided at the ends of the plurality of liquid extraction pipes, and a drainage pipe is rotatably connected to the ends of the circulation pipes. A water inlet pipe is provided at one end of the cooling roller away from the drainage pipe, and the water inlet pipe is rotatably connected to the inside of the water pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Through the provision of multiple water chambers, when cooling water is injected into the water pipe, the multiple water chambers can be quickly filled through the liquid outlet channel to perform heat exchange on the cooling roller. Through the synchronous heat exchange of multiple water chambers, the cooling roller can be effectively prevented from cooling unevenly when cooling the molten material, so that the molten material can be quickly formed into a film. Moreover, through the provision of a heat exchange head, while the water pipe passes the cooling material into the water chamber through the liquid outlet channel for cooling, a part of the cooling water will enter the side cooling chamber, and the cooling water in the water chamber will be heat exchanged through the heat exchange head, so that the cooling and heat exchange effect of the cooling water in the water chamber is better.

[0016] Through the setting of the filter plate, before the cooling water is injected into the water pipe, the entire filter plate will filter the cooling water to prevent impurities carried in the cooling water from entering the liquid outlet channel and causing the liquid outlet channel to be blocked. While the filter plate is filtering the cooling water, the cleaning plate will clean the surface of the filter plate through the push of hydraulic force to prevent the filter plate from filtering too many impurities and causing accumulation on the filter plate surface. Filtering the cooling water through the filter plate can further ensure the cooling effect of the cooling roller, allowing the film to be formed faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0018] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0019] Figure 3 The internal structure of the cooling roller of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 4 The internal structure of the cooling roller of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 5 The internal structure of the cooling roller of the present invention is shown in FIG. Figure 3 ;

[0022] Figure 6 Schematic diagram of the internal structure of the water chamber of the present invention Figure 1 ;

[0023] Figure 7 Schematic diagram of the internal structure of the water chamber of the present invention Figure 2 ;

[0024] Figure 8 for Figure 7 A magnified view of middle;

[0025] Fig. 9 Schematic diagram of the internal structure of the water chamber of the present invention Figure 3 ;

[0026] Fig.10 for Fig. 9 Enlarged view of middle B;

[0027] Fig.11 It is a schematic diagram of the plane structure of the filter plate of the present invention;

[0028] Fig.12 It is a schematic diagram of the cleaning plate structure of the present invention;

[0029] Fig.13 It is a schematic diagram of the cross-sectional structure of the cooling roller of the present invention;

[0030] Fig.14 It is a schematic diagram of the side structure of the cooling roller of the present invention.

[0031] In the attached drawings, the parts represented by the reference numerals are as follows: 1. Equipment body; 2. Extrusion piece; 3. Extrusion die; 4. Top box; 5. Cooling roller; 6. Connecting rod; 7. Drain pipe; 8. Water pipe; 9. Water cavity; 10. Circulation pipe; 11. Pressing magnet; 12. Water inlet pipe; 13. Water pipe; 14. Liquid outlet channel; 15. Side cooling chamber; 16. Filter plate; 17. Liquid extraction pipe; 18. Branch pipe ; 19. Pumping pipe; 20. Heat exchange head; 21. Flow hole; 22. Slide; 23. Counterweight; 24. Bubble making plate; 25. Heat conducting fin; 26. Paddle; 27. Side rod; 28. Cleaning plate; 29. ​​Water wheel; 30. Slide rail; 31. Elastic rod; 32. Scraper; 33. Tension spring; 34. Contact magnet; 35. Dirt storage box; 36. One-way pipe; 37. Dirt storage pull-out box. DETAILED DESCRIPTION

[0032] 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.

[0033] Example 1: Please refer to Figure 1 - Fig.11 The figure shows a film casting machine, including an equipment body 1, an extrusion piece 2 is installed on the equipment body 1, an extrusion die head 3 is arranged inside the extrusion piece 2, a plurality of cooling rollers 5 are rotatably connected inside the equipment body 1, a water inlet pipe 12 is arranged at one end of the cooling roller 5 away from the drain pipe 7, the water inlet pipe 12 is rotatably connected to the inside of the water pipe 13, a top box 4 is installed on the equipment body 1, connecting rods 6 are arranged at both ends of the cooling roller 5, a water pipe 13 is arranged inside the cooling roller 5, and a plurality of water The plurality of water cavities 9 are connected to each other with a plurality of liquid outlet channels 14, and the plurality of liquid outlet channels 14 are connected to the inside of the water pipe 13. The plurality of water cavities 9 are connected to each other with a plurality of side cooling chambers 15, and the plurality of side cooling chambers 15 are provided with flow holes 21, and the flow holes 21 are connected to the inside of the water cavity 9. The flow holes 21 are provided with heat conducting fins 25, and the ends of the heat conducting fins 25 are provided with heat exchanging heads 20, and the heat exchanging heads 20 are located inside the water cavity 9. The inner wall of the side cooling chamber 15 is provided with a cooling head 21. The cooling mechanism includes a slide groove 22 provided on the inner wall of the side cooling chamber 15, a counterweight 23 is slidably connected to the inner wall of the slide groove 22, a bubble making plate 24 is provided on the outer wall of the counterweight 23, and the bubble making plate 24 is hollowed out. Slide rails 30 are provided on both sides of the interior of the water pipe 13, and a filter plate 16 is slidably connected to the inner wall of the slide rail 30. An elastic rod 31 is provided inside the slide rail 30, and the other end of the elastic rod 31 is fixedly connected to the outer wall of the filter plate 16. A cleaning mechanism is provided on the filter plate 16, and the cleaning mechanism The structure includes a water wheel 29 rotatably connected to the outer wall of the filter plate 16, a plurality of paddles 26 are fixedly connected to the water wheel 29, a cleaning plate 28 is fixedly connected to the outer wall of the water wheel 29, a scraper 32 is slidably connected to the inner wall of the cleaning plate 28, a plurality of tension springs 33 are fixedly connected to the inside of the cleaning plate 28, the other ends of the plurality of tension springs 33 are fixedly connected to the scraper 32, a pressing magnet 11 is fixedly connected to the outer wall of the scraper 32, and side rods 27 are fixedly connected to the outer walls of multiple side cooling chambers 15 close to the filter plate 16.

[0034] In this embodiment, when in use, first the extrusion die 3 will extrude the pre-treated molten material onto the cooling roller 5, which will be cooled by the cooling roller 5 (this is the prior art and will not be elaborated on in detail). When the cooling roller 5 needs to rotate to cool the extruded molten material, the operator can turn on the water pump connected to the water inlet pipe 12 to pass cooling water into the cooling roller 5. When the cooling water enters the water pipe 13 through the water inlet pipe 12, it will first be filtered by the filter plate 16 at the front end of the water pipe 13, and the corrosion products such as metal oxides carried inside will be filtered on its surface. Since the water inlet pipe 12 draws cooling water through the water pump, the cooling water entering the water pipe 13 has a certain impact force. When the impact cooling water enters the water pipe 13 and impacts the paddle 26, it will drive the entire water wheel 29 to rotate. When the water wheel 29 rotates, it will drive multiple cleaning plates 28 to scrape the surface of the filter plate 16 through the scraper 32. The scraping cleaning is performed to prevent more impurities from remaining on the surface of the filter plate 16, which may cause the filter plate 16 to be blocked. While the water wheel 29 drives the cleaning plate 28 to clean the surface of the filter plate 16, it also drives the pressing magnet 11 located on the surface of the cleaning plate 28 to rotate synchronously. When the pressing magnet 11 rotates to the positive side of the contact magnetic block 34, under the action of the repulsive magnetic force, the scraper 32 will overcome the pulling force of the tension spring 33 and move toward the direction of the filter plate 16, contact and press the filter plate 16, so that it slides in the slide rail 30. Since the pressing magnet 11 is constantly rotating and approaching the contact magnetic block 34 as the cleaning plate 28, under the action of the intermittent magnetic force and the pulling force of the tension spring 33, the scraper 32 will intermittently press the filter plate 16 while rotating to clean the filter plate 16, so that the filter plate 16 is shaken in the slide rail 30. When the filter plate 16 shakes, the impurities attached to its surface can be shaken off, further ensuring the cleaning effect of the surface of the filter plate 16.

[0035] Example 2: Please refer to Figure 1 - Fig.14In the figure, the side rod 27 penetrates into the interior of the water pipe 13, and a contact magnetic block 34 is arranged on the side rod 27. The magnetic pole of the contact magnetic block 34 is the same as the magnetic pole of the pressing magnet 11. The interior of the water pipe 13 is connected to a dirt storage box 35, and a one-way pipe 36 is arranged inside the dirt storage box 35. A dirt storage pull-out box 37 is slidably arranged at the bottom of the one-way pipe 36. The dirt storage pull-out box 37 slides through the outside of the cooling roller 5, and a filter is arranged inside the dirt storage pull-out box 37. The interior of the dirt storage box 35 is connected to a water guide pipe 8, and the guide The other end of the water pipe 8 is connected to the interior of the liquid outlet channel 14 adjacent thereto. A plurality of liquid extraction pipes 17 are arranged between the plurality of water chambers 9. The interiors of the plurality of liquid extraction pipes 17 are all connected thereto with branch pipes 18. The plurality of branch pipes 18 are respectively located inside the plurality of water chambers 9. The interiors of the plurality of liquid extraction pipes 17 are all connected thereto with water extraction pipes 19. One end of the water extraction pipe 19 away from the liquid extraction pipe 17 is connected to the interior of the side cooling chamber 15. The ends of the plurality of liquid extraction pipes 17 are connected thereto with a circulation pipe 10. The end of the circulation pipe 10 is rotatably connected thereto with a drain pipe 7.

[0036] In this embodiment, after the cooling water is filtered by the filter plate 16 at the front end of the water pipe 13 and enters the water pipe 13, it will synchronously pass through the multiple liquid outlet channels 14 to fill the multiple water chambers 9 during the rotation of the cooling roller 5. The cooling water in the water chamber 9 exchanges heat with the cooling roller 5. The synchronous heat exchange of the multiple water chambers 9 can avoid the cooling roller 5 from cooling the molten material. The non-uniform cooling phenomenon can be avoided (it should be noted that a one-way valve is provided inside the liquid outlet channel 14. When the liquid outlet channel 14 injects cooling water into the water chamber 9, the cooling water will not flow back through the liquid outlet channel 14). When the cooling roller 5 rotates and passes the cooling water into the water chamber 9 through the liquid outlet channel 14 for heat exchange, the heat exchange head 20 on the heat-conducting fin 25 can exchange heat with the cooling water in the water chamber 9. The heat exchange is performed on the cooling water with temperature. Since the surface of the heat exchange head 20 is wrinkled, the contact area with the cooling water in the water chamber 9 can be increased, and the heat exchange effect is better. When the heat exchange head 20 completes the heat exchange of the cooling water in the water chamber 9, the heat exchanged will be conducted to the heat conducting fins 25 (it should be noted that the heat conducting fins 25 and the heat exchange head 20 are both made of brass and have strong thermal conductivity). Through the setting of the flow hole 21, when the cooling roller 5 rotates, a part of the cooling water carried in the water pipe 13 will enter the side cooling chamber 15 through the flow hole 21 (it should be noted that a one-way valve is also provided inside the flow hole 21 to ensure that after the flow hole 21 enters the side cooling chamber 15, it will not flow back to the water pipe 13 through the flow hole 21 again).

[0037] When there is a portion of cooling water in the side cooling chamber 15, as the cooling roller 5 rotates, the position of the side cooling chamber 15 located inside the cooling roller 5 will change continuously. When the position of the side cooling chamber 15 changes continuously, the counterweight 23 will drive the bubble making plate 24 to slide up and down along the slide groove 22 under the action of its own gravity. When the bubble making plate 24 slides up and down, bubbles will be created in the cooling water inside the side cooling chamber 15. The disturbing effect of the bubbles can reduce the thermal resistance between the heat conducting fins 25 and the cooling water, making it easier for the heat carried by the heat conducting fins 25 themselves to be transferred to the cooling water, so that the cooling water inside the side cooling chamber 15 can cool the heat conducting fins 25 more efficiently, thereby ensuring the thermal conductivity of the heat exchange head 20. When multiple After the heat exchange of the cooling water in the water cavity 9 is completed, the operator can turn on the circulation pump inside the circulation pipe 10, and suck the cooling water in the multiple water cavities 9 respectively through the branch pipes 18 on the multiple liquid extraction pipes 17. When the liquid extraction pipe 17 extracts the cooling water in the water cavity 9 through the branch pipe 18, it also extracts the cooling water in the side cooling chamber 15 through the water extraction pipe 19. When the cooling water in the water cavity 9 is completely extracted, it will be discharged out of the cooling roller 5 through the drain pipe 7. At this time, the water inlet pipe 12 will again introduce cooling water into the water pipe 13, and the cycle will be repeated to achieve cooling of the cooling roller 5. When the cooling roller 5 completes the cooling and forming of the film, the film will come to the rear of the equipment body 1 for winding (this is the prior art and will not be elaborated in detail).

[0038] It should be noted that, when the water flow impacts the blade 26, according to the law of conservation of energy, when the kinetic energy of the water is converted into the mechanical energy of the water wheel 29, the remaining kinetic energy of the water, i.e., the kinetic energy represented by the impact force, will decrease. Therefore, when the cooling water contacts the filter plate 16, the impact force will become smaller. Therefore, when the filter plate 16 shakes and the scraper 32 scrapes the impurities, the impurities can be scraped off and will not continue to be impacted by the cooling water and attached to the surface of the filter plate 16. After the impurities of the filter plate 16 are scraped off, when the cooling roller 5 drives the dirt storage box 35 to rotate to the position as shown in FIG. Fig.10 When in the position shown, the impurities at this time will, under the action of gravity, enter the dirt storage pull-out box 37 together with the cooling water through the one-way tube 36. Since a filter is provided in the dirt storage pull-out box 37, the impurities can be filtered and flow inside the dirt storage pull-out box 37, and the filtered cooling water will flow back to the liquid outlet channel 14 through the water conduit 8. When the dirt storage pull-out box 37 is full of impurities, the operator can pull the dirt storage pull-out box 37 out of the cooling roller 5 for cleaning.

[0039] It should be noted that the branch pipe 18 and the water pumping pipe 19 are both provided with a return water automatic opening and closing valve. Only when the pumping pipe 17 pumps water for circulation, water will flow through the branch pipe 18 and the water pumping pipe 19.

[0040] 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.

[0041] 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 film casting machine, comprising an equipment body (1), characterized in that: The device body (1) is provided with an extruder (2), an extrusion die (3) is provided inside the extruder (2), a plurality of cooling rollers (5) are rotatably connected inside the device body (1), a top box (4) is provided on the device body (1), connecting rods (6) are provided at both ends of the cooling roller (5), a water pipe (13) is provided inside the cooling roller (5), a plurality of water cavities (9) are provided inside the cooling roller (5), a plurality of liquid outlet channels (14) are provided inside the plurality of water cavities (9), and a plurality of liquid outlet channels (14) are provided inside the plurality of liquid outlet channels (14). The liquid channels (14) all penetrate into the interior of the water pipe (13); the interiors of the plurality of water cavities (9) are all connected to the plurality of side cooling chambers (15); the interiors of the plurality of side cooling chambers (15) are all provided with flow holes (21); the flow holes (21) are connected to the interior of the water cavities (9); heat-conducting fins (25) are installed inside the flow holes (21); a heat-exchange head (20) is provided at the end of the heat-conducting fins (25); the heat-exchange head (20) is located inside the water cavities (9); and a cooling mechanism is provided on the inner wall of the side cooling chamber (15); The cooling mechanism comprises a slide groove (22) provided on the inner wall of the side cooling chamber (15); a counterweight (23) is slidably connected to the inner wall of the slide groove (22); a bubble making plate (24) is provided on the outer wall of the counterweight (23); and the bubble making plate (24) is hollowed out; Slide rails (30) are provided on both sides of the water pipe (13); the inner wall of the slide rail (30) is slidably connected to the filter plate (16); an elastic rod (31) is provided inside the slide rail (30); the other end of the elastic rod (31) is fixedly connected to the outer wall of the filter plate (16); and a cleaning mechanism is provided on the filter plate (16); The cleaning mechanism comprises a water wheel (29) rotatably connected to the outer side wall of the filter plate (16), a plurality of paddles (26) being fixedly connected to the water wheel (29), a cleaning plate (28) being fixedly connected to the outer side wall of the water wheel (29), and a scraper (32) being slidably connected to the inner side wall of the cleaning plate (28).

2. A film casting machine according to claim 1, characterized in that; A plurality of tension springs (33) are fixedly connected inside the cleaning plate (28), the other ends of the plurality of tension springs (33) are fixedly connected to the scraper (32), and a pressing magnet (11) is fixedly connected to the outer wall of the scraper (32).

3. A film casting machine according to claim 2, characterized in that: A side rod (27) is fixedly connected to the outer side walls of the plurality of side cooling chambers (15) close to the filter plate (16), the side rod (27) extending through the interior of the water pipe (13), and a contact magnetic block (34) is provided on the side rod (27), wherein the magnetic pole of the contact magnetic block (34) is the same as the magnetic pole of the pressing magnet (11).

4. A film casting machine according to claim 1, characterized in that: The interior of the water pipe (13) is connected to a dirt storage box (35), the interior of the dirt storage box (35) is provided with a one-way pipe (36), the bottom of the one-way pipe (36) is slidably provided with a dirt storage pull-out box (37), the dirt storage pull-out box (37) slides through to the outside of the cooling roller (5), the interior of the dirt storage pull-out box (37) is provided with a filter screen, the interior of the dirt storage box (35) is connected to a water guide pipe (8), and the other end of the water guide pipe (8) is connected to the interior of a liquid outlet channel (14) adjacent thereto.

5. A film casting machine according to claim 1, characterized in that: A plurality of liquid extraction pipes (17) are arranged between the plurality of water chambers (9); the interiors of the plurality of liquid extraction pipes (17) are all connected to branch pipes (18); the plurality of branch pipes (18) are respectively located inside the plurality of water chambers (9); the interiors of the plurality of liquid extraction pipes (17) are all connected to water extraction pipes (19); one end of the water extraction pipe (19) away from the liquid extraction pipe (17) is connected to the interior of the side cooling chamber (15).

6. A film casting machine according to claim 5, characterized in that; The ends of the plurality of liquid extraction pipes (17) are connected to a circulation pipe (10), the end of the circulation pipe (10) is rotatably connected to a drainage pipe (7), and an inlet pipe (12) is provided at one end of the cooling roller (5) away from the drainage pipe (7), and the inlet pipe (12) is rotatably connected to the interior of the water passage pipe (13).

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