Winding device for CPP thin film

Abstract

The invention discloses a CPP film winding device which comprises a rack, discs are symmetrically and rotationally connected to the two sides in the rack, a driving device for driving the discs to rotate is arranged in the rack, at least two winding rollers are arranged between the two discs, and a magnetic suspension bearing is arranged on the side, away from the discs, of the top of the rack. The center of the magnetic suspension bearing is fixedly connected with a tension roller, the magnetic suspension bearing indirectly detects the radial pressure of the film on the tension roller, the top of the rack and located on one side of the tension roller are slidably connected with a base, the center of the base is rotationally connected with an adjusting roller, and film deviation correction is achieved through axial movement of the adjusting roller. An automatic cutting mechanism is arranged on the side, close to the disc, in the rack, and an ionic wind cleaning module is arranged on the surface of the rack and located between the tension roller and the adjusting roller. According to the winding device for the CPP thin film, the edge position of the thin film is monitored in real time, automatic deviation correction can be achieved, the winding quality is guaranteed, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thin film processing equipment, and particularly to a winding device for CPP films. Background Art

[0002] In the thin film production industry, the winding process of CPP films is a crucial link. Traditional winding devices often have problems such as inaccurate edge alignment and uneven tension distribution. These problems not only affect the appearance quality of the films but may also cause defects such as breakage and wrinkles in the subsequent processing of the films.

[0003] To solve these problems, technicians have been exploring more precise winding technologies. However, traditional mechanical detection and adjustment methods often have slow response speeds and low precision, making it difficult to meet the high requirements of modern thin film production. For example, when using a mechanical edge detection device, it is easily affected by vibration and wear, resulting in inaccurate detection. In terms of tension control, traditional spring or cylinder-type tension adjustment devices are difficult to achieve precise control and dynamic adjustment of tension. In addition, existing thin film cleaning components rely on physical contact (such as sticky rollers or scrapers), which are likely to damage the film surface or generate electrostatic adsorption.

[0004] At the same time, after the existing winding device finishes winding, manual intervention is required for new winding, which reduces the work efficiency. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a winding device for CPP films, which can monitor the edge position of the film in real time and automatically correct the deviation, ensuring the winding quality and improving the production efficiency.

[0007] (II) Technical Solutions

[0008] To achieve the above object, the present invention is realized by the following technical solutions: A winding device for CPP film, comprising a frame. On both sides inside the frame, there are symmetrically rotatably connected discs. A driving device for driving the discs to rotate is arranged inside the frame. At least two winding rollers are arranged between the two discs. A magnetic levitation bearing is arranged at the top of the frame and on the side far from the discs. A tension roller is fixedly connected to the center of the magnetic levitation bearing. The magnetic levitation bearing indirectly detects the radial pressure of the film on the tension roller. A base is slidably connected to the top of the frame and on the side of the tension roller. A regulating roller is rotatably connected to the center of the base. A power device for driving the base to slide along the length direction of the regulating roller is arranged at the bottom of the frame. The film is corrected by the axial movement of the regulating roller. An automatic cutting mechanism is arranged inside the frame and on the side close to the discs. A first bracket and a second bracket are arranged on the side of the frame close to the tension roller. A first laser displacement sensor is arranged on the surface of the first bracket, and a second laser displacement sensor is arranged on the surface of the second bracket. The tension roller is located between the first laser displacement sensor and the second laser displacement sensor in the vertical direction. An ion wind cleaning module is arranged on the surface of the frame and between the tension roller and the regulating roller.

[0009] Preferably, a fixing sleeve for fixing the magnetic levitation bearing is arranged at the top of the frame. The magnetic levitation bearing includes a stator, a rotor, and an electromagnetic coil group. The rotor is coaxially installed inside the stator. The electromagnetic coil group is evenly distributed along the circumference of the stator. Strain gauges are arranged on the surface of the rotor. The strain gauges are used to detect the deformation amount of the rotor caused by the radial pressure of the film. A Hall sensor is also arranged on the inner circumference of the stator. The Hall sensor is used to detect the air gap position between the rotor and the stator in real time.

[0010] Preferably, it further includes a controller. The controller is connected to the Hall sensor, the electromagnetic coil group, and the strain gauges. The controller calculates the radial pressure value of the film on the rotor according to the deformation signal output by the strain gauges. The Hall sensor monitors the air gap position in real time. When the air gap deviation exceeds the threshold, the controller adjusts the current intensity of the electromagnetic coil group to maintain the stable suspension of the rotor under a constant air gap.

[0011] Preferably, the automatic cutting mechanism includes a rotating shaft, a curved arm and a cutter, the rotating shaft is located on one side of the disc and has two ends rotatably connected to the frame, the curved arm is fixed to the surface of the rotating shaft and close to both ends, one end of the curved arm is fixedly connected to a rotating seat, both sides of the rotating seat are rotatably connected to the first rotating roller and the second rotating roller, one side of the curved arm is also rotatably connected to the rotating arm, the two ends of the cutter are fixed to the surface of the rotating arm, and the surface of the curved arm is also rotatably connected to a cylinder, the working end of the cylinder is rotatably connected to one side of the rotating arm, the cylinder drives the rotating arm to rotate, so that the cutter passes between the first rotating roller and the second roller to complete film cutting, and the surface of the frame is also provided with a driving motor that drives the rotating shaft to rotate, and the driving motor drives the rotating arm to rotate around the center of the rotating shaft so that the surface of the first roller contacts the surface of the winding roller.

[0012] Preferably, the ion wind cleaning module includes a first cleaning tube, a third bracket and a second cleaning tube, the third bracket is installed on the top of the frame and is located between the tension roller and the adjustment roller, the second cleaning tube is installed on the surface of the third bracket, the first cleaning tube is installed between the two sides of the frame, and the surfaces of the first cleaning tube and the second cleaning tube are provided with air outlets, the first cleaning tube blows air to remove dust on one side of the film, and the second cleaning tube blows air to remove dust on the other side of the film.

[0013] Preferably, the length direction of the first cleaning tube and the second cleaning tube is parallel to the width direction of the film, a first air inlet is provided at one end of the first cleaning tube, and a second air inlet is provided at one end of the second cleaning tube, and the first air inlet and the second air inlet are connected to the air outlet end of the ion blower.

[0014] Preferably, the strain gauges are semiconductor piezoresistive sensors, which are arranged in a spiral shape along the circumference of the rotor and cover the entire surface of the rotor.

[0015] Preferably, the driving device includes a fixed shaft, a driving motor, a rotating seat and a driving shaft, the fixed shaft is fixed at the center of the disc and one end is rotatably connected to the inner wall of the frame, the driving motor and the rotating seat are fixed to the bottom inside the frame, the rotating seat is arranged on both sides of the rotating seat, the driving shaft is rotatably connected to the rotating seat and one end is rotatably connected to the inner wall of the frame, the surface of the driving shaft is fixedly connected to the first synchronous wheel, the surface of the fixed shaft is fixedly connected to the second synchronous wheel, and a synchronous belt is connected between the first synchronous wheel and the second synchronous wheel.

[0016] Preferably, the surface of the disc is provided with a connecting seat adapted to the winding roller, the connecting seat is rotatably connected to the disc, and a reel motor is provided on one side of the disc located inside the frame, and the working end of the reel motor is fixedly connected to one end of the connecting seat.

[0017] Preferably, strip-shaped mounting holes are provided on the surfaces of the first bracket and the second bracket. The first laser displacement sensor is arranged directly below the second laser displacement sensor. The first laser displacement sensor and the second laser displacement sensor detect the edge positions of the film.

[0018] (III) Beneficial effects

[0019] The present invention provides a winding device for CPP film, which has the following beneficial effects: Through the strain gauges and Hall sensors built in the magnetic levitation bearing, non-contact detection of the radial pressure of the film is realized, improving the detection accuracy, which is superior to traditional mechanical bearings; combined with the real-time position feedback of the first laser displacement sensor and the second laser displacement sensor, lateral deviation correction of the film is achieved by adjusting the axial movement of the roller, ensuring the winding quality of the film; the ion wind cleaning module blows the two sides of the film synchronously through the first cleaning pipe and the second cleaning pipe, realizing non-contact film cleaning, avoiding damage to the film surface and improving the cleaning effect; the set automatic cutting mechanism drives the cutter through a cylinder to complete film cutting, which is suitable for continuous production and improves production efficiency. Description of the drawings

[0020] Figure 1 Schematic diagram of the overall structure of the present invention Figure 1 ; Figure 2 Schematic diagram of the overall structure of the present invention Figure 2 ; Figure 3 Schematic sectional view of the present invention; Figure 4 Schematic diagram of the structure of the magnetic levitation bearing of the present invention; Figure 5 For the present invention Figure 3 Enlarged view at A in Figure 6 Schematic diagram of the structure of the driving device of the present invention; Figure 7 Schematic diagram of the working state of the automatic cutting mechanism of the present invention.

[0021] In the figure: 1 - frame, 2 - disc, 201 - connecting seat, 202 - reel motor, 3 - driving device, 301 - fixed shaft, 302 - driving motor, 303 - rotating seat, 304 - driving shaft, 305 - first synchronous pulley, 306 - second synchronous pulley, 307 - synchronous belt, 4 - winding roller, 5 - magnetic levitation bearing, 51 - stator, 52 - rotor, 53 - electromagnetic coil group, 54 - strain gauge, 55 - Hall sensor, 6 - fixed sleeve, 7 - tension roller, 8 - base, 9 - adjusting roller, 10 - power device, 11 - rotating shaft, 12 - bent arm, 13 - rotating seat, 14 - first rotating roller, 15 - second rotating roller, 16 - rotating arm, 17 - cutter, 18 - cylinder, 19 - first bracket, 20 - second bracket, 21 - second laser displacement sensor, 22 - first laser displacement sensor, 23 - first cleaning pipe, 24 - third bracket, 25 - second cleaning pipe, 26 - first air inlet, 27 - second air inlet, 28 - driving motor. Detailed implementation manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figure 1-7 , the present invention provides a technical solution: a winding device for CPP film, including a frame 1, two discs 2 are symmetrically and rotatably connected to both sides inside the frame 1, a driving device 3 for driving the disc 2 to rotate is arranged inside the frame 1, at least two winding rollers 4 are arranged between the two discs 2, and the winding rollers 4 are evenly circumferentially distributed. In this embodiment, two winding rollers 4 are arranged. A connecting seat 201 adapted to the winding roller 4 is arranged on the surface of the disc 2, the winding roller 4 is detachably connected to the connecting seat 201, the connecting seat 201 is rotatably connected to the disc 2, a reel motor 202 is arranged on one side of the disc 2 inside the frame 1, and the working end of the reel motor 202 is fixedly connected to one end of the connecting seat 201. The reel motor 202 drives the winding roller 4 to rotate through the connecting seat 201 to realize continuous winding.

[0024] The driving device 3 includes a fixed shaft 301, a driving motor 302, a rotating seat 303 and a driving shaft 304. The fixed shaft 301 is fixed at the center of the disc 2 and one end is rotatably connected to the inner wall of the frame 1. The driving motor 302 and the rotating seat 303 are fixed to the bottom inside the frame 1. The rotating seat 303 is arranged on both sides of the rotating seat 303. The driving shaft 304 is rotatably connected to the rotating seat 303 and one end is rotatably connected to the inner wall of the frame 1. The surface of the driving shaft 304 is fixedly connected to the first synchronous wheel 305, and the surface of the fixed shaft 301 is fixedly connected to the second synchronous wheel 306. A synchronous belt 307 is connected between the first synchronous wheel 305 and the second synchronous wheel 306. The driving motor 302 realizes the rotation of the disc 2 through the rotation of the synchronous belt, thereby realizing the adjustment of the position of the winding roller 4 to facilitate continuous winding.

[0025] A magnetic bearing 5 is provided at the top of the frame 1 and on the side away from the disc 2. The center of the magnetic bearing 5 is fixedly connected to the tension roller 7. A fixed sleeve 6 for fixing the magnetic bearing 5 is provided on the top of the frame 1. The magnetic bearing 5 includes a stator 51, a rotor 52 and an electromagnetic coil group 53. The rotor 52 is coaxially installed inside the stator 51. The electromagnetic coil group 53 is evenly distributed along the circumference of the stator 51. A strain gauge 54 is provided on the surface of the rotor 52. The strain gauge 54 is used to detect the deformation of the rotor 52 caused by the radial pressure of the film. The strain gauge 54 is a semiconductor piezoresistive sensor and is arranged in a spiral shape along the circumference of the rotor 52, covering the entire surface of the rotor 52. A Hall sensor 55 is also provided on the inner circumference of the stator 51. The Hall sensor 55 is used to detect the air gap position between the rotor 52 and the stator 51 in real time. The magnetic bearing 5 indirectly detects the radial pressure of the film on the tension roller 7.

[0026] The system also includes a controller, which connects the Hall effect sensor 55, the electromagnetic coil assembly 53, and the strain gauge 54. Based on the deformation signal output by the strain gauge 54, the controller calculates the radial pressure exerted by the film on the rotor 52. Specifically, the controller monitors the real-time current of the electromagnetic coil and, in combination with parameters such as the number of coil turns and magnetic field strength, calculates the electromagnetic force using the formula F = k·I² (k is the magnetic field coefficient), thereby indirectly determining the radial pressure exerted by the film on the tension roller. Furthermore, the strain gauge 54 uses a micro-strain gauge with a resolution of 0.1μm to directly measure rotor deformation and integrate it with current feedback data to improve detection accuracy.

[0027] The Hall sensor 55 monitors the air gap position in real time. When the air gap deviation exceeds the threshold, the controller adjusts the current intensity of the electromagnetic coil group 53, integrates the radial pressure value with the air gap position data, and dynamically adjusts the current distribution of the electromagnetic coil group 53 through the PID algorithm, so that the rotor 52 can be stably suspended under a constant air gap and output a high-precision tension value at the same time.

[0028] On the top of the frame 1 and on one side of the tension roller 7, a base 8 is slidably connected. A regulating roller 9 is rotatably connected to the center of the base 8. A power device 10 for driving the base 8 to slide along the length direction of the regulating roller 9 is arranged at the bottom of the frame 1. The power device 10 adopts a high-precision screw drive. When the regulating roller 9 moves along its own axis, the wrap angle of the film on the roller surface changes slightly, and the lateral component force of the frictional force corrects the film deviation. Therefore, the film deviation correction can be realized by the axial movement of the regulating roller 9.

[0029] On one side of the frame 1 close to the tension roller 7, a first support 19 and a second support 20 are arranged. A first laser displacement sensor 22 is arranged on the surface of the first support 19, and a second laser displacement sensor 21 is arranged on the surface of the second support 20. The tension roller 7 is located between the first laser displacement sensor 22 and the second laser displacement sensor 21 in the vertical direction. Strip-shaped mounting holes are arranged on the surfaces of the first support 19 and the second support 20. The strip-shaped mounting holes facilitate the detection of films with different widths. The first laser displacement sensor 22 is arranged directly below the second laser displacement sensor 21. The edge position of the film is monitored in real time by the first laser displacement sensor 22 and the second laser displacement sensor 21, and the lateral offset (ΔL) is detected.

[0030] The current distribution of the electromagnetic coil group (53) is adjusted in real time through the PID algorithm to maintain the rotor (52) in a stable suspension at the center position of the air gap and accurately feedback the film tension; Input signal: The lateral offset (ΔL) of the laser displacement sensor; Hall sensor 55: Detect the real-time air gap deviation (Δx, Δy) between the rotor and the stator.

[0031] Strain gauge 54: Measure the deformation (ε) of the rotor and convert it into the radial pressure (F) of the film.

[0032] Output control quantity: The lateral movement amount of the regulating roller 9 is the output (u1), and the adjustment amount of the electromagnetic coil current (u2). The control logic flow is as follows: Data acquisition: The laser displacement sensor scans the edge of the film and calculates the lateral offset ΔL.

[0033] The Hall sensor and the strain gauge collect the air gap deviation (Δx, Δy) and the tension F.

[0034] Control decision: Position priority strategy: If ΔL > threshold (such as 0.5 mm), give priority to adjusting the position of the guiding roller; Tension-air gap coordination: Maintain the stability of the tension and the air gap within the controllable range of ΔL.

[0035] Execute the adjustment: The guiding roller servo motor receives the displacement command u1 and laterally moves to correct ΔL; The electromagnetic coil adjusts the current according to the PID output u2 to stabilize the air gap and the tension.

[0036] An automatic cutting mechanism is arranged inside the frame 1 and close to one side of the disc 2. The automatic cutting mechanism includes a rotating shaft 11, a bent arm 12 and a cutting knife 17. The rotating shaft 11 is located on one side of the disc 2 and its two ends are rotatably connected to the frame 1. The bent arm 12 is fixed on the surface of the rotating shaft 11 and close to both ends. One end of the bent arm 12 is fixedly connected with a rotating seat 13. The two sides of the rotating seat 13 are rotatably connected with a first roller 14 and a second roller 15. One side of the bent arm 12 is also rotatably connected with a rotating arm 16. The two ends of the cutting knife 17 are fixed on the surface of the rotating arm 16. A cylinder 18 is also rotatably connected to the surface of the bent arm 12. The working end of the cylinder 18 is rotatably connected to one side of the rotating arm 16. The cylinder 18 drives the rotating arm 16 to rotate, so that the cutting knife 17 passes through between the first roller 14 and the second roller 15 to complete the film cutting. A driving motor 28 for driving the rotating shaft 11 to rotate is also arranged on the surface of the frame 1. The driving motor 28 drives the rotating arm 16 to rotate around the center of the rotating shaft 11 so that the surface of the first roller 14 contacts the surface of the winding roller 4.

[0037] An ion wind cleaning module is arranged on the surface of the frame 1 and between the tension roller 7 and the adjusting roller 9. The ion wind cleaning module includes a first cleaning pipe 23, a third bracket 24 and a second cleaning pipe 25. The third bracket 24 is installed on the top of the frame 1 and between the tension roller 7 and the adjusting roller 9. The second cleaning pipe 25 is installed on the surface of the third bracket 24. The first cleaning pipe 23 is installed between the two sides of the frame 1. Air outlets are arranged on the surfaces of the first cleaning pipe 23 and the second cleaning pipe 25. The first cleaning pipe 23 blows air and removes dust from one side of the film, and the second cleaning pipe 25 blows air and removes dust from the other side of the film, and blows towards the film at an angle of 30°-45°. The length directions of the first cleaning pipe 23 and the second cleaning pipe 25 are parallel to the width direction of the film. A first air inlet 26 is arranged at one end of the first cleaning pipe 23, and a second air inlet 27 is arranged at one end of the second cleaning pipe 25. The first air inlet 26 and the second air inlet 27 are communicated with the air outlet end of the ion blower. Neutralize static electricity on both sides synchronously to avoid secondary pollution caused by electrostatic adsorption on the other side due to unilateral cleaning. At the same time, the air flow counteracting can reduce the film vibration.

[0038] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0039] [[ID=

Claims

1. A winding device for CPP film, comprising a frame (1), characterized in that: On both sides inside the frame (1), there are symmetrically rotatably connected discs (2). Inside the frame (1), there is a driving device (3) for driving the discs (2) to rotate. Between the two discs (2), there are at least two winding rollers (4). On the top of the frame (1) and on the side far from the discs (2), there is a magnetic levitation bearing (5). The center of the magnetic levitation bearing (5) is fixedly connected with a tension roller (7). The magnetic levitation bearing (5) indirectly detects the radial pressure of the film on the tension roller (7). On the top of the frame (1) and on the side of the tension roller (7), there is a sliding connection with a base (8). The center of the base (8) is rotatably connected with an adjusting roller (9). At the bottom of the frame (1), there is a power device (10) for driving the base (8) to slide along the length direction of the adjusting roller (9). The film is corrected by the axial movement of the adjusting roller (9). Inside the frame (1) and on the side close to the discs (2), there is an automatic cutting mechanism. On the side of the frame (1) close to the tension roller (7), there are a first support (19) and a second support (20). On the surface of the first support (19), there is a first laser displacement sensor (22). On the surface of the second support (20), there is a second laser displacement sensor (21). The tension roller (7) is located between the first laser displacement sensor (22) and the second laser displacement sensor (21) in the vertical direction. On the surface of the frame (1) and between the tension roller (7) and the adjusting roller (9), there is an ion wind cleaning module.

2. The winding device for CPP film according to claim 1, characterized in that: On the top of the frame (1), there is a fixing sleeve (6) for fixing the magnetic levitation bearing (5). The magnetic levitation bearing (5) includes a stator (51), a rotor (52), and an electromagnetic coil group (53). The rotor (52) is coaxially installed inside the stator (51). The electromagnetic coil group (53) is evenly distributed along the circumference of the stator (51). On the surface of the rotor (52), there is a strain gauge (54). The strain gauge (54) is used to detect the deformation amount of the rotor (52) caused by the radial pressure of the film. On the inner circumference of the stator (51), there is also a Hall sensor (55). The Hall sensor (55) is used to detect the air gap position between the rotor (52) and the stator (51) in real time.

3. A winding device for CPP film according to claim 2, characterized in that: It also includes a controller. The controller is connected to the Hall sensor (55), the electromagnetic coil group (53), and the strain gauge (54). The controller calculates the radial pressure value of the film on the rotor (52) according to the deformation signal output by the strain gauge (54). The Hall sensor (55) monitors the air gap position in real time. When the air gap deviation exceeds the threshold, the controller adjusts the current intensity of the electromagnetic coil group (53) to maintain the rotor in stable suspension under a constant air gap.

4. A winding device for CPP film according to claim 1, characterized in that: The automatic cutting mechanism includes a rotating shaft (11), a bent arm (12) and a cutter (17). The rotating shaft (11) is located on one side of the disc (2) and is rotatably connected to the frame (1) at both ends. The bent arm (12) is fixed on the surface of the rotating shaft (11) near both ends. One end of the bent arm (12) is fixedly connected with a rotating seat (13). A first roller (14) and a second roller (15) are rotatably connected to both sides of the rotating seat (13). A rotating arm (16) is also rotatably connected to one side of the bent arm (12). Both ends of the cutter (17) are fixed on the surface of the rotating arm (16). A cylinder (18) is also rotatably connected to the surface of the bent arm (12). The working end of the cylinder (18) is rotatably connected to one side of the rotating arm (16). The cylinder (18) drives the rotating arm (16) to rotate, so that the cutter (17) passes between the first roller (14) and the second roller (15) to complete the film cutting. A driving motor (28) for driving the rotating shaft (11) to rotate is also arranged on the surface of the frame (1). The driving motor (28) drives the rotating arm (16) to rotate around the center of the rotating shaft (11) so that the surface of the first roller (14) contacts the surface of the winding roller (4).

5. A winding device for CPP film according to claim 1, characterized in that: The ion wind cleaning module includes a first cleaning pipe (23), a third bracket (24) and a second cleaning pipe (25). The third bracket (24) is installed on the top of the frame (1) and is located between the tension roller (7) and the adjusting roller (9). The second cleaning pipe (25) is installed on the surface of the third bracket (24). The first cleaning pipe (23) is installed between both sides of the frame (1). Air outlets are arranged on the surfaces of the first cleaning pipe (23) and the second cleaning pipe (25). The first cleaning pipe (23) blows air to remove dust from one side of the film, and the second cleaning pipe (25) blows air to remove dust from the other side of the film.

6. The winding device for CPP film according to claim 5, characterized in that: The length directions of the first cleaning pipe (23) and the second cleaning pipe (25) are parallel to the width direction of the film. A first air inlet (26) is arranged at one end of the first cleaning pipe (23), and a second air inlet (27) is arranged at one end of the second cleaning pipe (25). The first air inlet (26) and the second air inlet (27) are communicated with the air outlet end of the ion blower.

7. A winding device for CPP film according to claim 2, characterized in that: The strain gauge (54) is a semiconductor piezoresistive sensor, which is arranged in a spiral shape along the circumference of the rotor (52) and covers the entire surface of the rotor (52).

8. The winding device for CPP film according to claim 1, characterized in that: The driving device (3) includes a fixed shaft (301), a driving motor (302), a rotating seat (303) and a driving shaft (304). The fixed shaft (301) is fixed at the center of the disc (2) and one end thereof is rotatably connected to the inner wall of the frame (1). The driving motor (302) and the rotating seat (303) are fixed at the bottom inside the frame (1). The rotating seat (303) is arranged on both sides of the rotating seat (303). The driving shaft (304) is rotatably connected to the rotating seat (303) and one end thereof is rotatably connected to the inner wall of the frame (1). A first synchronous pulley (305) is fixedly connected to the surface of the driving shaft (304). A second synchronous pulley (306) is fixedly connected to the surface of the fixed shaft (301). A synchronous belt (307) is drivingly connected between the first synchronous pulley (305) and the second synchronous pulley (306).

9. The winding device for CPP film according to claim 1, characterized in that: A connecting seat (201) adapted to the winding roller (4) is arranged on the surface of the disc (2). The connecting seat (201) is rotatably connected to the disc (2). A winding shaft motor (202) is arranged on one side of the disc (2) inside the frame (1). The working end of the winding shaft motor (202) is fixedly connected to one end of the connecting seat (201).

10. A winding device for CPP film according to claim 1, characterized in that: Strip-shaped mounting holes are arranged on the surfaces of the first bracket (19) and the second bracket (20). The first laser displacement sensor (22) is arranged directly below the second laser displacement sensor (21). The first laser displacement sensor (22) and the second laser displacement sensor (21) detect the edge position of the film.

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