An automatic tension-adjusting film winding device

Abstract

This utility model discloses an automatic tension-adjusting film winding device, belonging to the field of film winding devices. It includes a concave frame with a tension adjustment mechanism inside. A tension sensor in the tension adjustment mechanism monitors the tension on the film in real time. When the tension sensor detects a deviation from the set range, it promptly feeds a signal back to the control system. The control system then starts a second motor, which drives a drive gear to rotate. The drive gear meshes with a driven gear, causing the first rotating rod at the bottom of the driven gear to rotate. Since the nut at the bottom of the first rotating rod is threadedly connected to a one-way screw on the bottom surface of the floating plate, the rotation of the first rotating rod drives the one-way screw to move up and down, thereby causing the floating plate to move up and down along the guide rail. The tension adjustment roller on the floating plate moves accordingly, thus changing the wrap angle and force condition of the film on the winding path, achieving automatic tension adjustment.

Description

Technical Field

[0001] This utility model relates to the field of film winding devices, and in particular to a film winding device with automatic tension adjustment. Background Technology

[0002] Plastic film is a thin, soft, transparent or opaque sheet material made primarily from high-molecular polymers (such as polyethylene, polypropylene, polyvinyl chloride, polyester, etc.) through processes like blow molding, casting, and calendering. It is characterized by its lightweight, high transparency, waterproof and moisture-proof properties, good chemical stability, moderate mechanical strength, and excellent processing performance. Its thickness typically ranges from a few micrometers to several hundred micrometers. In the packaging industry, it protects goods from environmental influences and extends shelf life, finding widespread applications in food and pharmaceutical packaging. In agriculture, it can be used for greenhouse coverings to increase temperature and humidity, promoting crop growth. In industry, it serves as insulation and corrosion-resistant materials, meeting the specific needs of various sectors.

[0003] In existing technologies, plastic films need to be collected using a film winding device after production and processing. However, current film winding devices have the following problems during the winding process:

[0004] 1. Due to differences in film material, thickness, production speed, and other factors, the tension on the film during winding is difficult to maintain constant. When the tension is too high, the film will be stretched or even broken due to excessive tensile force, which will not only lead to a serious decline in product quality but also cause a large waste of raw materials. When the tension is too low, the film will not be wound tightly and is prone to wrinkles and looseness, which will seriously affect the appearance of the product and the smooth progress of subsequent processing.

[0005] Second, different specifications of film have different tension requirements when winding. Existing winding devices often lack flexibility and cannot automatically adjust the tension according to changes in film specifications, requiring frequent manual intervention. This not only increases the labor intensity of operators, but also makes it difficult to guarantee the stability and consistency of winding quality due to the subjectivity and error of manual adjustment.

[0006] Third, during the winding process, due to the lack of effective limiting measures, the film is prone to deviation. Film deviation will not only further aggravate the problem of uneven tension and make the winding effect worse, but may also cause the film to rub or entangle with other parts of the winding device, affecting the normal operation of the equipment and even causing safety accidents. Utility Model Content

[0007] The main objective of this invention is to provide an automatic tension-adjusting film winding device, which can effectively solve the problems in the background art.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] An automatic tension-adjustable film winding device includes a concave frame. The concave frame contains a tension adjustment mechanism, which includes a second motor, a drive gear, a driven gear, a floating plate, tension sensors, a fourth bearing seat, a tension adjustment roller, a bidirectional screw, and roller holes. The second motor is fixedly connected to the bottom surface of a supporting horizontal plate within the concave frame, and the drive gear is fixedly connected to the output end of the second motor. The driven gear is movably connected to the top surface of the supporting horizontal plate via a first rotating rod at its bottom end and meshes with the drive gear. The floating plate is movably connected to the first rotating rod via a unidirectional screw on its bottom surface. Symmetrical tension sensors are fixedly connected to the top surface of the floating plate, and the fourth bearing seat is fixedly connected to the top surface of the tension sensors. The tension adjustment roller is movably connected between the fourth bearing seats. The bidirectional screw is movably connected between symmetrical fixed blocks at the front end of the floating plate via second rotating rods at both ends. Two limiting plates are movably connected to the bidirectional screw via L-shaped connecting plates on the front end wall.

[0010] As a further preferred embodiment of this utility model, first bearing seats are fixedly installed on the left and right side walls of the concave frame, and a take-up roller is movably installed between the first bearing seats. A large pulley is also fixedly installed on the drive shaft at one end of the take-up roller. A motor base is fixedly installed inside the concave frame, and a first motor is fixedly installed on the top surface of the motor base. A small pulley is fixedly installed on the output end of the first motor, and a belt is movably installed between the small pulley and the large pulley. A set of symmetrical support seats are also fixedly installed on both sides of the inner wall of the concave frame, and a second bearing seat is fixedly installed on the top surface of the support seat. Guide rollers are movably installed between the left and right symmetrical second bearing seats.

[0011] As a further preferred embodiment of this utility model, the supporting horizontal plate is fixedly installed inside the concave frame, and a third bearing seat is fixedly installed inside the top surface of the supporting horizontal plate. Guide rails are also fixedly installed on both sides of the concave frame above the supporting horizontal plate. The second motor is fixedly installed on the bottom surface of the supporting horizontal plate, and a drive gear is fixedly installed at the output end of the second motor.

[0012] As a further preferred embodiment of this utility model, a first rotating rod is fixedly installed on the bottom surface of the driven gear, and the first rotating rod is movably installed together with the third bearing seat. A through hole penetrating the driven gear is opened at the bottom end of the first rotating rod, and a nut is fixedly installed in the hole. A one-way screw is fixedly installed on the bottom surface of the floating plate, and the one-way screw is threadedly connected to the nut. Slider blocks are fixedly installed on the left and right side walls of the floating plate, and the sliders are slidably installed together with the guide rail. A set of symmetrical tension sensors is fixedly installed on the top surface of the floating plate, and a fourth bearing seat is fixedly installed on the top surface of the tension sensors. A tension adjusting roller is movably installed between the fourth bearing seats.

[0013] As a further preferred embodiment of this utility model, the top surface of the floating plate is provided with a set of symmetrical guide openings, and a set of symmetrical fixing blocks are fixedly installed on the front wall of the floating plate, with rotating holes provided on the side wall of the fixing blocks.

[0014] As a further preferred embodiment of this utility model, a second rotating rod is fixedly installed at each of the left and right ends of the bidirectional screw, and the second rotating rod is movably installed in the rotating hole. A knob is also fixedly installed on the outer end of one of the second rotating rods. The limiting plate is provided with a set of left and right symmetrical ones, and a roller hole larger than the diameter of the tension adjusting roller is opened on the side wall of the limiting plate. The tension adjusting roller passes through the roller hole. A guide block is fixedly installed on the bottom surface of the limiting plate and is movably installed in the guide opening. An L-shaped connecting plate is fixedly installed on the front end of the limiting plate, and a screw hole for threaded connection with the bidirectional screw is opened on the vertical side wall of the L-shaped connecting plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In this invention, the tension sensor in the tension adjustment mechanism monitors the tension of the film in real time. When the tension sensor detects that the tension deviates from the set range, it will promptly send a signal back to the control system. The control system will then start the second motor, which drives the drive gear to rotate. The drive gear meshes with the driven gear, causing the first rotating rod at the bottom of the driven gear to rotate. Since the nut at the bottom of the first rotating rod is threadedly connected to the one-way screw on the bottom surface of the floating plate, the rotation of the first rotating rod will drive the one-way screw to move up and down, thereby driving the floating plate to move up and down along the guide rail. The tension adjustment roller on the floating plate moves accordingly, thereby changing the wrap angle and force of the film on the winding path, realizing automatic tension adjustment. This automatic adjustment mechanism can accurately adapt to the characteristics of different films, ensuring that the film is always in a suitable tension state during the winding process.

[0017] When the tension is too high, the tension adjustment mechanism will automatically reduce the tension to prevent the film from being stretched or even broken, thus avoiding the waste of raw materials and the decline in product quality caused by excessive tension. When the tension is too low, the tension adjustment mechanism will automatically increase the tension to make the film roll up tightly, reduce the occurrence of wrinkles and looseness, and ensure the appearance quality of the product and the smooth progress of subsequent processing.

[0018] Meanwhile, the tension adjustment mechanism can automatically adjust the tension based on the feedback signal from the tension sensor, eliminating the need for frequent manual intervention. Operators only need to set the tension parameters corresponding to different film specifications in the initial stage, and the device can automatically adjust the tension according to the film specifications during the subsequent winding process. This not only reduces the labor intensity of operators but also reduces the subjectivity and errors caused by manual adjustment. Because the device can automatically and accurately adjust the tension, films of different specifications can maintain a stable tension state during the winding process, thereby ensuring the stability and consistency of winding quality. This is especially important for large-scale production, as it can improve production efficiency, reduce the defect rate, and enhance the economic benefits of enterprises.

[0019] The combination of the bidirectional screw and the limiting plate effectively limits the film. The operator can rotate the bidirectional screw by turning the knob. Since the bidirectional screw is threadedly connected to the screw hole on the L-shaped connecting plate at the front end of the limiting plate, the rotation of the bidirectional screw will drive the two limiting plates to move closer or further apart along the guide, thereby adjusting the distance between the two limiting plates according to the width of the film. This ensures that the film is always kept on the correct winding path, effectively preventing film deviation. This not only avoids the problem of deterioration in winding effect caused by uneven tension, but also reduces the possibility of friction or entanglement between the film and other parts of the winding device. This helps protect the equipment, extends its service life, and reduces the risk of safety accidents caused by equipment failure, ensuring the safe and stable operation of the production process. Attached Figure Description

[0020] Figure 1 This is a top view of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the overall structure of the concave frame of this utility model;

[0023] Figure 4 This is a structural breakdown diagram of the tension adjustment mechanism of this utility model;

[0024] Figure 5 This is a split diagram of the upper limit structure of the tension adjustment mechanism of this utility model.

[0025] In the diagram: 1. Concave frame; 2. First bearing seat; 3. Take-up roller; 4. Large pulley; 5. Motor seat; 6. First motor; 7. Small pulley; 8. Belt; 9. Support seat; 10. Second bearing seat; 11. Guide roller; 12. Tension adjustment mechanism; 13. Support plate; 14. Third bearing seat; 15. Second motor; 16. Drive gear; 17. Driven gear; 18. First rotating rod; 19. Through hole; 20. Nut; 21. Floating plate; 22. One-way screw; 23. Tension sensor; 24. Fourth bearing seat; 25. Tension adjusting roller; 26. Slider; 27. Guide rail; 28. Guide opening; 29. ​​Fixing block; 30. Rotating hole; 31. Two-way screw; 32. Second rotating rod; 33. Knob; 34. Limiting plate; 35. Roller hole; 36. Guide block; 37. L-shaped connecting plate; 38. Screw hole. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 - Figure 5 As shown, an automatic tension-adjustable film winding device includes a concave frame 1. The concave frame 1 has a tension adjustment mechanism 12 inside. The tension adjustment mechanism 12 includes a second motor 15, a driving gear 16, a driven gear 17, a floating plate 21, a tension sensor 23, a fourth bearing seat 24, a tension adjustment roller 25, a bidirectional screw 31, and a roller hole 35. The second motor 15 is fixedly connected to the bottom surface of a supporting horizontal plate 13 inside the concave frame 1, and the driving gear 16 is fixedly connected to the output end of the second motor 15. The driven gear 17 is movably connected to the supporting horizontal plate 13 via a first rotating rod 18 at its bottom end. The top surface of the floating plate 21 meshes with the drive gear 16, and the floating plate 21 is movably connected to the first rotating rod 18 through the one-way screw 22 on the bottom surface. The top surface of the floating plate 21 is fixedly connected with symmetrical tension sensors 23, and the fourth bearing seat 24 is fixedly connected to the top surface of the tension sensor 23. The tension adjusting roller 25 is movably connected between the fourth bearing seats 24. The bidirectional screw 31 is movably connected between the symmetrical fixed blocks 29 at the front end of the floating plate 21 through the second rotating rods 32 at both ends, and the two limiting plates 34 are movably connected to the bidirectional screw 31 through the L-shaped connecting plate 37 on the front wall.

[0029] like Figure 1 and Figure 2 As shown, first bearing seats 2 are fixedly installed on the left and right side walls of the concave frame 1, and a take-up roller 3 is movably installed between the first bearing seats 2. A large pulley 4 is also fixedly installed on the drive shaft at one end of the take-up roller 3. A motor seat 5 is fixedly installed inside the concave frame 1, and a first motor 6 is fixedly installed on the top surface of the motor seat 5. A small pulley 7 is fixedly installed on the output end of the first motor 6, and a belt 8 is movably installed between the small pulley 7 and the large pulley 4. A set of symmetrical support seats 9 are also fixedly installed on both sides of the inner wall of the concave frame 1, and a second bearing seat 10 is fixedly installed on the top surface of the support seat 9. Guide rollers 11 are movably installed between the left and right symmetrical second bearing seats 10. When the first motor 6 is running, it drives the take-up roller 3 to rotate through the belt drive of the large pulley 4, the small pulley 7 and the belt 8, so that the film winding process is stable and orderly. At the same time, before winding, the film bypasses the guide roller 11 for guidance and transmission, ensuring that the film maintains the correct direction during the winding process, which helps to improve the winding quality and efficiency.

[0030] like Figure 3 and Figure 4 As shown, the support plate 13 is fixedly installed inside the concave frame 1, and a third bearing seat 14 is fixedly installed inside the top surface of the support plate 13. The third bearing seat 14 is used to cooperate with the first rotating rod 18 to realize the rotation operation. Guide rails 27 are also fixedly installed on both sides inside the concave frame 1 and above the support plate 13. The guide rails 27 are used to cooperate with the slider 26 to realize the precise guidance of the movement of the floating plate 21. The second motor 15 is fixedly installed on the bottom surface of the support plate 13, and an active gear 16 is fixedly installed at the output end of the second motor 15. Turning on the second motor 15 can drive the output end to drive the active gear 16 to rotate, providing driving force for the operation of the tension adjustment mechanism 12.

[0031] like Figure 4As shown, a first rotating rod 18 is fixedly installed on the bottom surface of the driven gear 17. The first rotating rod 18 is movably installed together with the third bearing seat 14. A through hole 19 is opened at the bottom end of the first rotating rod 18, penetrating the driven gear 17, and a nut 20 is fixedly installed in the through hole 19. A one-way screw 22 is fixedly installed on the bottom surface of the floating plate 21, and the one-way screw 22 is threadedly connected to the nut 20. Slider blocks 26 are fixedly installed on the left and right side walls of the floating plate 21, and the sliders 26 are slidably installed together with the guide rail 27. A set of symmetrical tension sensors 23 is fixedly installed on the top surface of the floating plate 21, and a fourth bearing seat 24 is fixedly installed on the top surface of the tension sensors 23. The fourth bearing seats 24 are movably installed between each other. There is a tension adjusting roller 25. The driven gear 17 rotates under the rotational engagement of the driving gear 16. Since the first rotating rod 18 is fixedly installed on the bottom surface of the driven gear 17 and the first rotating rod 18 is movably installed with the third bearing seat 14, the rotation of the driven gear 17 will drive the first rotating rod 18 to rotate synchronously in the third bearing seat 14. When the first rotating rod 18 rotates, the nut 20 rotates accordingly. According to the screw and nut transmission principle, the rotation of the nut 20 will drive the one-way screw 22 to move up and down in a straight line. The one-way screw 22 will drive the floating plate 21 to move up and down. The film passes around the tension adjusting roller 25. When the floating plate 21 moves up and down, it will drive the tension adjusting roller 25 to change position, thereby adjusting the tension of the film.

[0032] like Figure 4 and Figure 5 As shown, the top surface of the floating plate 21 is also provided with a set of left and right symmetrical guide openings 28. The guide openings 28 are used to cooperate with the guide block 36 to realize the limiting and guiding movement of the limiting plate 34. A set of left and right symmetrical fixing blocks 29 are fixedly installed on the front wall of the floating plate 21. The side wall of the fixing block 29 is provided with a rotating hole 30. The rotating hole 30 is used to cooperate with the second rotating rod 32 to realize the rotation operation.

[0033] like Figure 4 and Figure 5As shown, a second rotating rod 32 is fixedly installed at both ends of the bidirectional screw 31, and the second rotating rod 32 is movably installed in the rotating hole 30. A knob 33 is also fixedly installed on the outer end of one of the second rotating rods 32. The limiting plate 34 is provided with a set of left and right symmetrical ones, and the side wall of the limiting plate 34 is provided with a roller hole 35 larger than the diameter of the tension adjusting roller 25. The tension adjusting roller 25 passes through the roller hole 35. A guide block 36 is fixedly installed on the bottom surface of the limiting plate 34, and the guide block 36 is movably installed in the guide opening 28. An L-shaped connecting plate 37 is fixedly installed on the front end of the limiting plate 34, and the vertical side wall of the L-shaped connecting plate 37 is... The upper part has a screw hole 38 that is threadedly connected to the bidirectional screw 31. Rotating the knob 33 drives the bidirectional screw 31 to rotate through the second rotating rod 32. Since the bidirectional screw 31 is threadedly connected to the screw hole 38 on the L-shaped connecting plate 37, the rotation of the bidirectional screw 31 will drive the two limiting plates 34 to move closer or further apart along the guide 28. By adjusting the distance between the two limiting plates 34, the film can be precisely limited according to the film width to prevent the film from deviating during the winding process, ensuring that the film is always on the correct winding path, avoiding problems such as uneven tension and friction and entanglement with equipment parts caused by film deviation, and improving the winding quality and the safety of equipment operation.

[0034] The specific operating principle of this automatically tension-adjustable film winding device is as follows:

[0035] Before the film officially enters the take-up roller 3, it must first pass through the guide roller 11 between the second bearing seats 10 on the support seats 9 on both sides of the inner wall of the concave frame 1. The film passes under the two guide rollers 11. The support and guidance of the guide rollers 11 are used to regulate the direction of travel and ensure that it enters the subsequent stage smoothly. Then, the film passes over the tension adjustment roller 25 in the tension adjustment mechanism 12. At this time, the tension sensor 23 installed on the top surface of the floating plate 21 begins to monitor the film tension in real time.

[0036] To prevent film deviation, the operator can rotate knob 33, which is fixed to the second rotating rod 32 at one end of the bidirectional screw 31. The second rotating rod 32 is installed in the rotating hole 30 of the fixing block 29 at the front end of the floating plate 21. Rotating knob 33 drives the bidirectional screw 31 to rotate through the second rotating rod 32. Since the bidirectional screw 31 is threadedly connected to the screw hole 38 on the L-shaped connecting plate 37 at the front end of the limiting plate 34, it will drive the two limiting plates 34 to move along the guide opening 28 on the top surface of the floating plate 21. The guide block 36 on the bottom surface of the limiting plate 34 slides with the guide opening 28 to ensure smooth movement. The roller hole 35 on the side wall of the limiting plate 34 is fitted outside the tension adjusting roller 25. By adjusting the distance between the two limiting plates 34 to match the film width, precise positioning can be achieved, avoiding uneven tension or equipment friction problems caused by film deviation.

[0037] During film winding, the first motor 6, installed on the motor base 5 inside the concave frame 1, is powered on first and starts to run. The small pulley 7 at its output end rotates at high speed. Through the transmission of the belt 8, the power is transmitted to the large pulley 4 fixed on the drive shaft of the winding roller 3, which in turn drives the winding roller 3 between the first bearing seats 2 on the left and right sides to start rotating. During the rotation, the winding roller 3 will complete the winding of the film. The guide roller 11 and the tension adjusting roller 25 will rotate between the second bearing seat 10 and the fourth bearing seat 24 respectively under the drive of the film.

[0038] When the tension sensor 23 detects that the film winding tension deviates from the set value, the signal is fed back to the control system, which then starts the second motor 15 fixed to the bottom surface of the support plate 13. The drive gear 16 at the output end of the second motor 15 begins to rotate. Because the drive gear 16 and the driven gear 17 are meshed together, the drive gear 16 will drive the driven gear 17 to rotate under the rotational meshing action. The driven gear 17 will drive the first rotating rod 18 at the bottom end to rotate in the third bearing seat 14. Since the nut 20 in the through hole 19 at the bottom end of the first rotating rod 18 is threadedly connected to the one-way screw 22 on the bottom surface of the floating plate 21, the rotation of the first rotating rod 18 will drive the one-way screw 22 to move up and down. At this time, the sliders 26 on both sides of the floating plate 21 will move synchronously along the guide rails 27 installed on both sides of the inner wall of the concave frame 1. The sliding mechanism drives the floating plate 21 to move up and down along the guide rail 27, thereby changing the position of the tension adjusting roller 25 between the fourth bearing seats 24. By adjusting the film wrap angle and the force, the tension is automatically adjusted. When the tension is too high, the tension adjusting mechanism 12 will drive the tension adjusting roller 25 to move downward to automatically reduce the tension until the tension sensor 23 detects that the tension value is within a suitable range, preventing the film from being stretched or even broken, and avoiding the waste of raw materials and the decline in product quality caused by excessive tension. When the tension is too low, the tension adjusting mechanism 12 will drive the tension adjusting roller 25 to move upward to automatically increase the tension until the tension sensor 23 detects that the tension value is within a suitable range, making the film tightly wound, reducing the occurrence of wrinkles and looseness, ensuring the appearance quality of the product and the smooth progress of subsequent processing.

[0039] The winding roller 3, guide roller 11 and tension adjusting roller 25 are all equipped with drive shafts at both ends, and the drive shafts are fixedly connected to the bearings in the corresponding bearing seats to realize the rotation of the winding roller 3, guide roller 11 and tension adjusting roller 25.

[0040] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A film winding device with automatic tension adjustment, comprising a concave holder (1), characterized in that: The concave frame (1) is equipped with a tension adjustment mechanism (12), which includes a second motor (15), a drive gear (16), a driven gear (17), a floating plate (21), a tension sensor (23), a fourth bearing seat (24), a tension adjustment roller (25), a bidirectional screw (31), and a roller hole (35). The second motor (15) is fixedly connected to the bottom surface of the supporting horizontal plate (13) inside the concave frame (1), and the drive gear (16) is fixedly connected to the output end of the second motor (15). The driven gear (17) is movably connected to the top surface of the supporting horizontal plate (13) through the first rotating rod (18) at the bottom end and is connected to the drive gear. (16) Engagement, and the floating plate (21) is movably connected to the first rotating rod (18) through the one-way screw (22) on the bottom surface. The top surface of the floating plate (21) is fixedly connected to a symmetrical tension sensor (23), and the fourth bearing seat (24) is fixedly connected to the top surface of the tension sensor (23). The tension adjusting roller (25) is movably connected between the fourth bearing seats (24). The bidirectional screw (31) is movably connected between the symmetrical fixed blocks (29) at the front end of the floating plate (21) through the second rotating rods (32) at both ends. The two limiting plates (34) are movably connected to the bidirectional screw (31) through the L-shaped connecting plate (37) on the front end wall.

2. The film winding device with automatic tension adjustment according to claim 1, characterized in that: First bearing seats (2) are fixedly installed on the left and right side walls of the concave frame (1), and a take-up roller (3) is movably installed between the first bearing seats (2). A large pulley (4) is also fixedly installed on the drive shaft at one end of the take-up roller (3). A motor seat (5) is fixedly installed inside the concave frame (1), and a first motor (6) is fixedly installed on the top surface of the motor seat (5). A small pulley (7) is fixedly installed on the output end of the first motor (6), and a belt (8) is movably installed between the small pulley (7) and the large pulley (4). A set of symmetrical support seats (9) is also fixedly installed on both sides of the inner wall of the concave frame (1), and a second bearing seat (10) is fixedly installed on the top surface of the support seat (9). Guide rollers (11) are movably installed between the left and right symmetrical second bearing seats (10).

3. A film winding device of claim 2, wherein: The supporting horizontal plate (13) is fixedly installed inside the concave frame (1), and a third bearing seat (14) is fixedly installed inside the top surface of the supporting horizontal plate (13). Guide rails (27) are also fixedly installed on both sides inside the concave frame (1) and above the supporting horizontal plate (13). The second motor (15) is fixedly installed on the bottom surface of the supporting horizontal plate (13), and a drive gear (16) is fixedly installed at the output end of the second motor (15).

4. A film winding device of claim 3, wherein: The driven gear (17) is fixedly mounted with a first rotating rod (18) on its bottom surface. The first rotating rod (18) is movably mounted with the third bearing seat (14). The bottom end of the first rotating rod (18) is provided with a through hole (19) that passes through the driven gear (17). A nut (20) is fixedly mounted in the hole (19). The bottom surface of the floating plate (21) is fixedly mounted with a one-way screw (22). The one-way screw (22) is threadedly connected with the nut (20). The left and right side walls of the floating plate (21) are respectively fixedly mounted with sliders (26). The sliders (26) are slidably mounted with the guide rail (27). The top surface of the floating plate (21) is fixedly mounted with a set of left and right symmetrical tension sensors (23). The top surface of the tension sensors (23) is fixedly mounted with a fourth bearing seat (24). A tension adjusting roller (25) is movably mounted between the fourth bearing seats (24).

5. A film winding device of the type described in claim 4, wherein: The top surface of the floating plate (21) is provided with a set of left and right symmetrical guide openings (28), and a set of left and right symmetrical fixing blocks (29) are fixedly installed on the front wall of the floating plate (21), and the side wall of the fixing block (29) is provided with a rotating hole (30).

6. A film winding device of the type described in claim 5, wherein: The two ends of the bidirectional screw (31) are respectively fixedly installed with second rotating rods (32), and the second rotating rods (32) are movably installed in the rotating hole (30). A knob (33) is also fixedly installed on the outer end of one end of the second rotating rod (32). The limiting plate (34) is provided with a set of left and right symmetrical ones, and the side wall of the limiting plate (34) is provided with a roller hole (35) larger than the diameter of the tension adjusting roller (25). The tension adjusting roller (25) passes through the roller hole (35). The bottom surface of the limiting plate (34) is fixedly installed with a guide block (36), and the guide block (36) is movably installed in the guide opening (28). The front end of the limiting plate (34) is fixedly installed with an L-shaped connecting plate (37), and the vertical side wall of the L-shaped connecting plate (37) is provided with a screw hole (38) that is threadedly connected to the bidirectional screw (31).

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