Edge clamping device for isolating membrane coating machine and coating machine comprising same

Abstract

The invention relates to an edge clamping device for an isolating membrane coating machine and a coating machine comprising the same, and belongs to the technical field of lithium ion battery pole piece coating, the edge clamping device comprises a supporting seat, a left edge clamping device and a right edge clamping device, the left edge clamping device and the right edge clamping device are symmetrically arranged on the supporting seat, the supporting seat is installed on a rack of the coating machine through a fixing plate, and the left edge clamping device and the right edge clamping device are arranged on the supporting seat. Each edge clamping device comprises a fixed mounting seat arranged on the supporting seat, the lower end of the fixed mounting seat is connected with a three-dimensional adjusting seat with an independent rotation adjusting function around the X axis, the Y axis and the Z axis of the space, and a driving clamping part and a driven clamping part are oppositely and fixedly arranged at the same output end of the three-dimensional adjusting seat to form a clamping jaw with an adjustable posture and are used for clamping the left edge and the right edge of a base film respectively; according to the method, the outward drawing force generated by the speed difference is actively applied to the edge of the base membrane, so that the internal stress causing edge collapse is effectively counteracted, the problems of transverse edge collapse and middle collapse of the ultrathin diaphragm in the coating process are solved, and the uniformity and surface density consistency of the coating are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery electrode coating technology, and more specifically, to a clamping device for a separator coating machine and a coating machine including the device. Background Technology

[0002] As lithium-ion batteries develop towards higher energy density, battery separators are evolving towards ultra-thinner and higher-strength designs. Coating the separator surface with special ceramic or polymer coatings is a key process for improving its thermal stability and electrolyte wettability. During this coating process, the base film needs to travel at high speed under significant tension. However, when the separator thickness decreases to 12μm or even thinner, its tensile strength and lateral stiffness decrease significantly, leading to lateral edge collapse and central collapse under tension. This means that the edges on both sides of the membrane shrink inward, forming "ruffled edges," while the central area sags due to edge contraction. Such collapses can cause uneven coating thickness, stripes or wavy lines, and increased friction between the membrane surface and the guide rollers, resulting in wrinkles. In severe cases, it can even cause membrane breakage, seriously affecting production yield and efficiency.

[0003] Currently, the industry mostly addresses these issues by optimizing tension control systems or adding edge guiding devices. However, existing tension systems struggle to achieve millisecond-level local tension compensation during high-speed operation, and traditional edge guiding can only physically limit the membrane edge, failing to continuously apply flattening tension to counteract internal stress. Consequently, it is difficult to fundamentally improve the lateral and central collapse problems of ultrathin membranes during high-speed coating.

[0004] Therefore, there is an urgent need for a clamping device for a separator coating machine and a coating machine including the device. Summary of the Invention

[0005] The purpose of this invention is to provide a clamping device for a separator film coating machine and a coating machine including the device, thereby solving the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A clamping device for a release film coating machine includes a support base, a left clamping device, and a right clamping device. The support base is fixed to the frame of the coating machine at both ends by fixing plates. The left and right clamping devices are symmetrically arranged on the support base and are used to clamp the left and right edges of the base film, respectively. Each of the left and right clamping devices includes a fixed mounting base, a three-dimensional adjustment base, an active clamping part, and a driven clamping part. One end of the fixed mounting base is fixed to the support base, and the other end is connected to the three-dimensional adjustment base. The three-dimensional adjustment base is provided with an adjustment mechanism that can be independently adjusted along the three rotational degrees of freedom of X, Y, and Z in space. The active clamping part is fixed to the adjustment output end of the three-dimensional adjustment base. The driven clamping part is arranged opposite to the active clamping part and fixed to the same adjustment output end of the three-dimensional adjustment base, together forming a jaw for clamping the edge of the base film.

[0007] As a preferred technical solution of the present invention, the active clamping part includes a first body, a first driving unit and an active driving wheel. The two ends of the active driving wheel are rotatably mounted on the first body. The first body is fixed to the adjustment output end of the three-dimensional adjustment seat. The first driving unit is fixed to the first body through a mounting plate. The power output end of the driving unit is connected to the active driving wheel. The driven clamping part includes a second body, a second driving unit, and a driven member. The second driving unit is fixedly mounted on the adjustment output end of the three-dimensional adjustment seat. The output end of the second driving unit is fixedly connected to the second body. The second body is provided with the driven member that cooperates with the active driving wheel to clamp the base film. The power output direction of the second driving unit is perpendicular to the rotation axis of the active driving wheel, and is used to adjust the distance between the active driving wheel and the driven member.

[0008] As a preferred technical solution of the present invention, the two ends of the active drive wheel are provided with bearings, the bearings are rotatably connected to the bearing seats correspondingly provided on the first body, the first drive unit includes a motor fixed on the first body, and the output shaft of the motor is rotatably connected to the active drive wheel through a coupling for driving the active drive wheel to rotate relative to the first body.

[0009] As a preferred technical solution of the present invention, the first body is further provided with a cantilever tension roller. The cantilever tension roller group includes a bracket and a roller. One end of the bracket is fixed on the first body and extends to the front of the feed side of the active drive wheel. The roller is rotatably mounted on the bracket, and its axis is parallel to the axis of the active drive wheel, which is used to pre-guide and buffer the base film before it enters the jaw.

[0010] As a preferred technical solution of the present invention, the motor is either a servo motor or a stepper motor.

[0011] As a preferred technical solution of the present invention, the driven component is a passive rubber roller rotatably mounted on the second body or an arc-shaped friction block fixedly mounted on the body.

[0012] As a preferred technical solution of the present invention, the surface linear velocity of the first driving unit driving the active driving wheel to rotate is set as v1, and the main traveling speed of the base film at the installation station of the clamping device is set as v2, wherein v1 is greater than v2.

[0013] As a preferred technical solution of the present invention, the support base is provided with a translation guide rail extending along the width direction of the base film and an adjusting screw. The fixed mounting bases of the left clamping device and the right clamping device are respectively slidably mounted on the translation guide rail via sliders. The adjusting screw is rotatably connected to the support base and threadedly driven with each fixed mounting base. One end of the adjusting screw is provided with an external thread handle. By rotating the external thread handle, the adjusting screw is driven to rotate, thereby driving the fixed mounting base to move along the translation guide rail. The fixed mounting base is provided with a locking device for locking the relative position of the fixed mounting base and the translation guide rail.

[0014] A coating machine including the edge clamping device for the release film coating machine includes a frame, and an unwinding traction roller, the edge clamping device, a coating device, a tension roller assembly, a guide roller and a winding traction roller are sequentially arranged on the frame in the base film traveling direction. The unwinding traction roller is rotatably mounted at the starting position of the frame to release and initially tension the base film; The clamping device is located downstream of the unwinding traction roller. The left and right clamping devices of the clamping device are symmetrically arranged on both sides of the base film travel path. The center line of the formed jaws is aligned with the travel path of the base film. It is used to apply lateral tension to the left and right edges of the base film and flatten it before the base film enters the coating area. The coating device is fixed on the frame and located downstream of the clamping device, and is used to coat the slurry onto the flattened base film surface. The tension roller assembly is rotatably mounted on the frame and located downstream of the coating device, for applying and maintaining a set longitudinal tension on the base film; The guide roller is rotatably mounted on the frame and located downstream of the tension roller assembly, for guiding and changing the direction of travel of the base film; The winding traction roller is rotatably mounted at the end of the frame and located downstream of the guide roller, for pulling and finally winding up the coated base film.

[0015] As a preferred technical solution of the present invention, a tension control device is also included. The tension control device includes a tension sensor disposed on the clamping device and a controller electrically connected to the tension sensor and the first driving unit. The tension sensor detects the tension data of the base film in real time and feeds the tension data back to the controller. The controller compares the tension data with a preset target tension value and dynamically adjusts the rotation speed of the first driving unit according to the comparison result through a PID control algorithm, so as to control the actual tension of the base film within the range of the target tension value.

[0016] In summary, compared with the prior art, the beneficial effects of the present invention are: This device effectively counteracts the internal stress that causes edge collapse by actively applying an outward tensile force generated by the speed difference to the edge of the base film. This fundamentally improves the problems of lateral edge collapse and central collapse of ultra-thin diaphragms during the coating process, especially for diaphragms smaller than 12μm, where the flattening effect is immediate. Thanks to the uniform and stable overall tension of the film surface, the gap between the base film and the coating head lip remains consistent, significantly improving coating uniformity and eliminating coating defects such as streaks and wavy lines, greatly improving product yield and areal density consistency. Simultaneously, the flat film surface effectively reduces abnormal friction and interference with the guide rollers, significantly reducing the probability of wrinkles and avoiding the risk of film breakage caused by localized stress concentration, ensuring the continuity and efficiency of high-speed production. The clamping device of this invention uses a motor drive and implements closed-loop control, enabling high-precision, dynamic, and real-time adjustment of the lateral tension. It flexibly adapts to changes in different base film materials, thicknesses, and process speeds, exhibiting strong process compatibility. In addition, the overall structure is simple and compact, making it easy to integrate into existing coating equipment. It can upgrade functions without large-scale modifications to the production line, and has the comprehensive advantages of low modification cost and short production cycle. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the clamping device for a separator film coating machine according to the present invention; Figure 2 This is a three-dimensional schematic diagram of the right clamping device of the present invention; Figure 3 This is a three-dimensional schematic diagram of the active clamping part of the present invention; Figure 4 This is a three-dimensional schematic diagram of the driven clamping part of the present invention; Figure 5 This is a three-dimensional schematic diagram of the adjustment angle of the three-dimensional adjustment seat of the present invention; Figure 6 This is a three-dimensional schematic diagram of a coating machine including an edge clamping device for a separator film coating machine according to the present invention; Figure 7 This is a front view of a coating machine that includes an edge clamping device for a release film coating machine according to the present invention; Figure 8 for Figure 7 CC section view; Among them, 1-frame, 2-unwinding traction roller, 3-clamping device, 31-support seat, 32-left clamping device, 33-right clamping device, 34-fixed plate, 35-fixed mounting seat, 36-three-dimensional adjustment seat, 37-active clamping part, first body, 371-first drive unit, 3711-motor, 3712-coupling, 372-active drive wheel, 373-mounting plate, 374-bearing, 375-bearing seat, 376-cantilever tension roller, 3761-bracket, 3762-roller, 38-driven clamping part, 381-second body, 382-second drive unit, 383-driven drive component, 39-translation guide rail, 4-coating device, 5-tension passing roller assembly, 6-guide passing roller, 7-rewinding traction roller. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] like Figures 1 to 5 As shown, a clamping device 3 for a separator film coating machine includes a support base 31, a left clamping device 32, and a right clamping device 33. The two ends of the support base 31 are fixed to the frame 1 of the coating machine by fixing plates 34. The left clamping device 32 and the right clamping device 33 are symmetrically arranged on the support base 31 and are used to clamp the left and right edges of the base film, respectively. The left clamping device 32 and the right clamping device 33 each include a fixed mounting base 35, a three-dimensional adjustment base 36, an active clamping part 37, and a driven clamping part 38. One end of the fixed mounting base 35 is fixed on the support base 31, and the other end is connected to the three-dimensional adjustment base 36. The three-dimensional adjustment base 36 is provided with an adjustment mechanism that can be independently adjusted along the three rotational degrees of freedom of space X, Y, and Z. The active clamping part 37 is fixed on the adjustment output end of the three-dimensional adjustment base 36. The driven clamping part 38 is arranged opposite to the active clamping part 37 and fixed on the adjustment output end of the same three-dimensional adjustment base 36, together forming a jaw for clamping the edge of the base film.

[0020] The clamping device 3 of this invention for a separator film coating machine provides independent rotational adjustment around the X, Y, and Z axes via a three-dimensional adjustment seat 36, giving the clamping jaws all-round posture adjustment capability, ensuring that the plane of the jaws is aligned with the edge of the base film and the contact angle is optimal, avoiding scratches or clamping failure caused by angle deviation. The left clamping device 32 and the right clamping device 33 are symmetrically and independently mounted on the support seat 31 with a translation guide rail 39, which can synchronously and evenly clamp the two sides of the base film, forming a symmetrical and uniform tension field in the width direction of the base film. This effectively prevents the base film from deviating, serpentinizing, or even tearing due to uneven force on one side during the coating process, ensuring the stability and flatness of the coating area. The working mode adopts an active clamping part 37 providing core power and a driven clamping part 38 following the pressing action. The driven clamping part 38 can dynamically compensate according to the instantaneous thickness fluctuation of the base film and automatically adjust the clamping pressure, effectively avoiding over-pressure or under-pressure phenomena caused by uneven thickness or jump of the base film, and achieving stable and flexible clamping.

[0021] As a preferred embodiment of the present invention, the active clamping part 37 includes a first body, a first driving unit 371 and an active driving wheel 372. The two ends of the active driving wheel 372 are rotatably mounted on the first body. The first body is fixed to the adjustment output end of the three-dimensional adjustment seat 36. The first driving unit 371 is fixed to the first body through the mounting plate 373. The power output end of the driving unit is connected to the active driving wheel 372. The driven clamping part 38 includes a second body 381, a second drive unit 382, ​​and a driven member 383. The second drive unit 382 is fixedly mounted on the adjustment output end of the three-dimensional adjustment seat 36. The output end of the second drive unit 382 is fixedly connected to the second body 381. The second body 381 is provided with a driven member 383 that cooperates with the active drive wheel 372 to clamp the base film. The power output direction of the second drive unit 382 is perpendicular to the rotation axis of the active drive wheel 372 and is used to adjust the distance between the active drive wheel 372 and the driven member 383.

[0022] As a preferred embodiment of the present invention, the two ends of the active drive wheel 372 are provided with bearings 374, and the bearings 374 are rotatably connected to the bearing seats 375 correspondingly provided on the first body. The first drive unit 371 includes a motor 3711 fixed on the first body. The output shaft of the motor 3711 is rotatably connected to the active drive wheel 372 through a coupling 3712, and is used to drive the active drive wheel 372 to rotate relative to the first body.

[0023] As a preferred embodiment of the present invention, the first body is further provided with a cantilever tension roller 376. The cantilever tension roller 376 group includes a bracket 3761 and a roller 3762. One end of the bracket 3761 is fixed on the first body and extends to the front of the feed side of the active drive wheel 372. The roller 3762 is rotatably mounted on the bracket 3761, and its axis is parallel to the axis of the active drive wheel 372, which is used to pre-guide and buffer the tension of the base film before it enters the jaw.

[0024] The cantilever tension roller 376 makes a preset wrap angle contact with the base film, establishes a tension gradient in advance, avoids impact deformation of the base film at the moment of clamping, provides a deterministic guide path, and eliminates positioning deviation caused by edge sway. The cantilever structure has flexible deformation characteristics, and when the film tension changes abruptly, the impact can be absorbed by the slight elastic deformation of the support 3761.

[0025] In a preferred embodiment of the present invention, the motor 3711 is either a servo motor or a stepper motor.

[0026] As a preferred embodiment of the present invention, the driven member 383 is a passive rubber roller rotatably mounted on the second body 381 or an arc-shaped friction block fixedly mounted on the body.

[0027] As a preferred embodiment of the present invention, the surface linear velocity of the first driving unit 371 driving the active driving wheel 372 to rotate is set as v1, and the main travel speed of the base film at the installation position of the clamping device 3 is set as v2, wherein v1 is greater than v2.

[0028] The linear velocity of the active drive wheel 372 is higher than the main travel speed of the base film, thereby applying a continuous outward lateral tensile force to the edge of the base film to counteract the internal stress generated by the longitudinal tension of the base film, achieving lateral flattening of the base film. This directly counteracts the natural "necking" internal stress generated by the base film under longitudinal tension, eliminating lateral wrinkles and central collapse from the physical source, and providing a perfectly flat substrate for subsequent high-quality coating.

[0029] In a preferred embodiment of the present invention, the support base 31 is provided with a translation guide rail 39 extending along the width direction of the base film and an adjusting screw. The fixed mounting seats 35 of the left clamping device 32 and the right clamping device 33 are respectively slidably mounted on the translation guide rail 39 by sliders. The adjusting screw is rotatably connected to the support base 31 and threadedly driven with each fixed mounting seat 35. One end of the adjusting screw is provided with an external thread handle. By rotating the external thread handle, the adjusting screw is rotated, thereby driving the fixed mounting seat 35 to move along the translation guide rail 39. The fixed mounting seat 35 is provided with a locking device for locking the relative position of the fixed mounting seat 35 and the translation guide rail 39.

[0030] The lead screw mechanism integrated on the support base 31 can drive the left clamping device 32 and the right clamping device 33 to move synchronously in opposite directions or in opposite directions along the guide rail, thereby realizing the rapid and precise adjustment of the clamping distance. This allows the device to easily adapt to base film products of different widths, greatly shortening the adjustment time when changing products and significantly improving the utilization rate and flexibility of production equipment.

[0031] Working principle: In the initial positioning stage, the three-dimensional adjustment seat 36 adjusts the spatial position of the output end so that the working surface of the active drive wheel 372 is aligned with the predetermined position of the base film edge. At this time, the second drive unit 382 is in a retracted state, and there is an introductory gap between the driven member 383 and the active drive wheel 372. The edge of the base film passes through the gap, and the second drive unit 382 pushes the second body 381 and the driven member 383 toward the active drive wheel 372 according to the base film thickness setting value until they make slight contact with the base film surface.

[0032] During the clamping phase, the second drive unit 382 continues to apply a preset pressure, causing the driven component 383 to press the base film onto the surface of the active drive wheel 372 with a constant positive pressure. The first drive unit 371 starts to drive the active drive wheel 372 to rotate at a set speed. Since the linear velocity V1 of the active wheel surface is slightly greater than the base film travel speed V2, it generates a forward traction force and an outward lateral tensile force on the base film under friction.

[0033] like Figures 6 to 8 As shown, a coating machine including a clamping device 3 for a release film coating machine includes a frame 1, an unwinding traction roller 2, a clamping device 3, a coating device 4, a tension roller assembly 5, a guide roller 6, and a winding traction roller 7 arranged sequentially on the frame 1 in the base film traveling direction. The unwinding traction roller 2 is rotatably installed at the starting position of the frame 1 to release and initially tension the base film; The clamping device is located downstream of the unwinding traction roller 2. The left clamping device 32 and the right clamping device 33 of the clamping device 3 are symmetrically arranged on both sides of the base film travel path. The center line of the formed jaw is aligned with the travel path of the base film. It is used to apply lateral tension to the left and right edges of the base film and flatten it before the base film enters the coating area. The coating device 4 is fixed on the frame 1 and located downstream of the clamping device 3, and is used to coat the slurry onto the flattened base film surface. The tension roller assembly 5 is rotatably mounted on the frame 1 and located downstream of the coating device 4, and is used to apply and maintain a set longitudinal tension on the base film; The guide roller 6 is rotatably mounted on the frame 1 and located downstream of the tension roller assembly 5, and is used to guide and change the direction of travel of the base film; The winding traction roller 7 is rotatably mounted at the end position of the frame 1 and located downstream of the guide roller 6. It is used to pull and finally wind up the coated base film.

[0034] As a preferred embodiment of the present invention, a tension control device is also included. The tension control device includes a tension sensor disposed on the clamping device 3 and a controller electrically connected to the tension sensor and the first drive unit 371. The tension sensor detects the tension data of the base film in real time and feeds the tension data back to the controller. The controller compares the tension data with a preset target tension value and dynamically adjusts the rotation speed of the first drive unit 371 according to the comparison result through a PID control algorithm, so as to control the actual tension of the base film within the target tension value range.

[0035] It should be understood that the above embodiments are one or more embodiments of the present invention. There are many other embodiments and variations based on the present invention. Any variations and modifications made by those skilled in the art without making pioneering innovations are within the protection scope of the present invention.

Claims

1. A clamping device for a release film coating machine, characterized in that: The device includes a support base, a left clamping device, and a right clamping device. The support base is fixed to the frame of the coating machine at both ends by fixing plates. The left and right clamping devices are symmetrically arranged on the support base and are used to clamp the left and right edges of the base film, respectively. Each of the left and right clamping devices includes a fixed mounting base, a three-dimensional adjustment base, an active clamping part, and a driven clamping part. One end of the fixed mounting base is fixed to the support base, and the other end is connected to the three-dimensional adjustment base. The three-dimensional adjustment base is provided with an adjustment mechanism that can be independently adjusted along the three rotational degrees of freedom of X, Y, and Z in space. The active clamping part is fixed to the adjustment output end of the three-dimensional adjustment base. The driven clamping part is arranged opposite to the active clamping part and fixed to the same adjustment output end of the three-dimensional adjustment base, together forming a jaw for clamping the edge of the base film.

2. The clamping device for a release film coating machine according to claim 1, characterized in that: The active clamping part includes a first body, a first driving unit, and an active driving wheel. The two ends of the active driving wheel are rotatably mounted on the first body. The first body is fixed to the adjustment output end of the three-dimensional adjustment seat. The first driving unit is fixed to the first body through a mounting plate. The power output end of the driving unit is connected to the active driving wheel. The driven clamping part includes a second body, a second driving unit, and a driven member. The second driving unit is fixedly mounted on the adjustment output end of the three-dimensional adjustment seat. The output end of the second driving unit is fixedly connected to the second body. The second body is provided with the driven member that cooperates with the active driving wheel to clamp the base film. The power output direction of the second driving unit is perpendicular to the rotation axis of the active driving wheel, and is used to adjust the distance between the active driving wheel and the driven member.

3. The clamping device for a separator coating machine according to claim 2, characterized in that: The active drive wheel is provided with bearings at both ends, and the bearings are rotatably connected to bearing seats corresponding to the first body. The first drive unit includes a motor fixed on the first body. The output shaft of the motor is rotatably connected to the active drive wheel through a coupling, and is used to drive the active drive wheel to rotate relative to the first body.

4. The clamping device for a release film coating machine according to claim 2, characterized in that: The first body is also provided with a cantilever tension roller. The cantilever tension roller assembly includes a bracket and a roller. One end of the bracket is fixed to the first body and extends to the front of the feed side of the active drive wheel. The roller is rotatably mounted on the bracket, and its axis is parallel to the axis of the active drive wheel. It is used to pre-guide and buffer the tension of the base film before it enters the jaw.

5. The clamping device for a release film coating machine according to claim 2, characterized in that: The motor is either a servo motor or a stepper motor.

6. The clamping device for a release film coating machine according to claim 2, characterized in that: The driven component is a passive rubber roller rotatably mounted on the second body or an arc-shaped friction block fixedly mounted on the body.

7. The clamping device for a release film coating machine according to claim 2, characterized in that: The surface linear velocity of the first driving unit driving the active driving wheel to rotate is set as v1, and the main travel speed of the base film at the installation position of the clamping device is set as v2, where v1 is greater than v2.

8. The clamping device for a separator coating machine according to claim 1, characterized in that: The support base is provided with a translation guide rail extending along the width direction of the base film and an adjusting screw. The fixed mounting bases of the left clamping device and the right clamping device are respectively slidably mounted on the translation guide rail via sliders. The adjusting screw is rotatably connected to the support base and threadedly driven with each fixed mounting base. One end of the adjusting screw is provided with an external thread handle. By rotating the external thread handle, the adjusting screw is rotated, thereby driving the fixed mounting base to move along the translation guide rail. The fixed mounting base is provided with a locking device for locking the relative position of the fixed mounting base and the translation guide rail.

9. A coating machine comprising the edge-clamping device for a release film coating machine as described in claim 2, characterized in that: The machine includes a frame, and an unwinding traction roller, the edge clamping device, the coating device, the tension passing roller assembly, the guide passing roller, and the winding traction roller, which are arranged sequentially on the frame in the direction of base film travel. The unwinding traction roller is rotatably mounted at the starting position of the frame to release and initially tension the base film; The clamping device is located downstream of the unwinding traction roller. The left and right clamping devices of the clamping device are symmetrically arranged on both sides of the base film travel path. The center line of the formed jaws is aligned with the travel path of the base film. It is used to apply lateral tension to the left and right edges of the base film and flatten it before the base film enters the coating area. The coating device is fixed on the frame and located downstream of the clamping device, and is used to coat the slurry onto the flattened base film surface. The tension roller assembly is rotatably mounted on the frame and located downstream of the coating device, for applying and maintaining a set longitudinal tension on the base film; The guide roller is rotatably mounted on the frame and located downstream of the tension roller assembly, for guiding and changing the direction of travel of the base film; The winding traction roller is rotatably mounted at the end of the frame and located downstream of the guide roller, for pulling and finally winding up the coated base film.

10. The coating machine according to claim 9, comprising an edge-clamping device for a release film coating machine, characterized in that: It also includes a tension control device, which includes a tension sensor disposed on the clamping device and a controller electrically connected to the tension sensor and the first drive unit. The tension sensor detects the tension data of the base film in real time and feeds the tension data back to the controller. The controller compares the tension data with a preset target tension value and dynamically adjusts the rotation speed of the first drive unit according to the comparison result through a PID control algorithm, so as to control the actual tension of the base film within the target tension value range.

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