A roll changing device

Abstract

The application relates to a roll changing device, belonging to the technical field of film material winding, which comprises a winding mechanism, the winding mechanism comprising a turret capable of rotating around its own axis and a winding shaft symmetrically arranged on the turret; a swing arm mechanism, a free end of a swing arm of the swing arm mechanism extending to the turret and being close to the lower side of a winding shaft on one side, the free end of the swing arm of the swing arm mechanism being provided with a cutter assembly and an elastic tensioning assembly, and a free end of the elastic tensioning assembly being provided with a grabbing component for grabbing the film material. When it is necessary to switch the winding shaft, the swing arm mechanism is swung upwards to be close to the winding shaft on one side, the film material is cut off by the cutter assembly, and the grabbing component on the elastic tensioning assembly is used to grab the tail part of the film material on the winding side which has been completed after being cut off. During the deceleration and stop of the old winding shaft, the elastic tensioning assembly elastically tensions the film material to keep the tension uninterrupted, avoids the tail part of the film material from falling to the ground, and effectively reduces the rejection rate of the film material between the two winding shafts during the automatic roll changing process.

Description

Technical Field

[0001] This application relates to the field of film material winding technology, and in particular to a roll changing device. Background Technology

[0002] In the field of secondary battery coating, to achieve continuous production without downtime, the unwinding of the substrate and the winding of the coated product typically employ an automatic switching mode with dual winding shafts. Currently, with the rapid growth in production capacity demand in the secondary battery industry, automatic winding and unwinding mechanisms are commonly used in the coating process to ensure production continuity. The mainstream turret-type dual-shaft switching structure can effectively maintain stable production line operation.

[0003] Among related technologies, patent CN219098231U discloses an automatic feeding device for winding multilayer separators for lithium batteries. This device achieves automatic feeding and rewinding of film material through automated control of material storage, cutting, and winding. Combined with turret forward and reverse rotation adjustment, it significantly improves winding efficiency and operational safety. However, while increasing production capacity, this technology still has significant drawbacks: during the dual-axis switching process, when the film material transitions from the old winding shaft to the new winding shaft, due to tension interruption, when the old winding shaft decelerates and stops, the tail end of the film material on that side falls and impacts the ground under centrifugal force, resulting in partial loss of the coating layer and wrinkles in the film material, causing product scrap.

[0004] Therefore, it is necessary to research and improve the relevant technologies and provide a roll changing device in order to achieve a more practical purpose. Summary of the Invention

[0005] In view of the shortcomings or deficiencies mentioned in the background technology above, this application provides a roll changing device, which aims to reduce the scrap rate of film material between two take-up shafts during automatic roll changing.

[0006] This application provides a roll changing device, including: A winding mechanism, the winding mechanism including a turret rotatable about its own axis, and winding shafts symmetrically arranged on the turret; The swing arm mechanism has a free end that extends toward the turret and is close to the underside of a take-up shaft on one side. The free end of the swing arm is provided with a cutter assembly and an elastic tensioning assembly. The free end of the elastic tensioning assembly is provided with a gripping component for gripping the film material.

[0007] In some embodiments, guide rollers are respectively provided at both ends of the swing arm of the swing arm mechanism, and a connecting assembly that cooperates with the cutter assembly is provided on the swing arm of the swing arm mechanism.

[0008] In some embodiments, the tape-attaching assembly includes a first rocker arm and a first drive member. The first rocker arm is rotatably connected to the rocker arm of the rocker arm mechanism. A pressure roller is connected to the end of the first rocker arm. The first drive member is used to drive the first rocker arm to rotate so that the pressure roller presses the film material against the take-up shaft.

[0009] In some embodiments, the cutter assembly includes a second swing arm and a second drive member. The second swing arm is rotatably connected to the swing arm of the swing arm mechanism. The cutter and the elastic tensioning assembly are connected to the second swing arm. The second drive member is used to drive the second swing arm to rotate so that the cutter and the elastic tensioning assembly are close to the film material.

[0010] In some embodiments, the elastic tensioning assembly includes a storage cylinder and a winding tape. The storage cylinder is connected to the second swing arm, and the winding tape is elastically wound inside the storage cylinder. The free end of the winding tape passes through the storage cylinder and is connected to the gripping component.

[0011] In some embodiments, a rotating shaft is rotatably connected inside the storage tube via a bearing, the end of the take-up tape is connected to and wound onto the rotating shaft, and the storage tube is provided with a strip-shaped hole for cooperating in taking on and unwinding the take-up tape.

[0012] In some embodiments, a coil spring is sleeved on the rotating shaft, with the inner end of the coil spring fixed to the rotating shaft and the outer end of the coil spring fixed to the storage cylinder.

[0013] In some embodiments, the gripping component is a connecting piece attached to the free end of the take-up tape, and the connecting piece is provided with an adhesive layer for adhering the film material.

[0014] In some embodiments, a connecting block is provided on the outer wall of the storage tube, and the connecting block is provided with a slot that matches the connecting piece, the opening of the slot facing the flow direction of the film material.

[0015] In some embodiments, the turret is symmetrically provided with guide shafts that cooperate with the take-up shaft, and the line of symmetry of the guide shafts is perpendicular to the line of symmetry of the take-up shaft.

[0016] The beneficial effects of the technical solution provided in this application include: This application provides a roll changing device. The winding mechanism includes a turret that can rotate around its own axis and winding shafts symmetrically arranged on the turret. The free end of the swing arm of the swing arm mechanism extends toward the turret and is close to the lower part of one side of the winding shaft. The free end of the swing arm of the swing arm mechanism is provided with a cutter assembly and an elastic tensioning assembly. The free end of the elastic tensioning assembly is provided with a gripping component for gripping the film material.

[0017] Therefore, when it is necessary to switch the take-up shaft, the swing arm mechanism swings upward and approaches one of the take-up shafts, and the cutter assembly cuts the film material. At the same time, the gripping component on the elastic tensioning assembly grabs the tail of the film material that has been cut and completed on the winding side. During the dual-shaft switching, when the old take-up shaft decelerates and stops, the elastic tensioning assembly elastically tensions the film material to maintain the tension without interruption, preventing the tail of the film material from falling and hitting the ground due to centrifugal force. This effectively reduces the scrap rate of the film material between the two take-up shafts during automatic roll changing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the roll changing device according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the connector assembly according to an embodiment of this application; Figure 3 This is a schematic diagram of the cutter assembly according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the elastic tensioning component according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the storage tube according to an embodiment of this application; Figure 6 This is a cross-sectional schematic diagram of the storage tube according to an embodiment of this application; Figure 7 This is a schematic diagram of the gripping component according to an embodiment of this application.

[0020] The attached diagram lists the components represented by each number as follows: 1. Rewinding mechanism; 11. Turret; 12. Rewinding shaft; 13. Guide shaft; 2. Swing arm mechanism; 21. Guide roller; 3. Tape splicing assembly; 31. First swing arm; 32. First drive component; 33. Pressure roller; 4. Cutting assembly; 41. Second swing arm; 42. Second drive component; 43. Cutting blade; 5. Elastic tensioning assembly; 51. Storage cylinder; 511. Strip hole; 52. Rewinding tape; 53. Bearing; 54. Rotary shaft; 55. Coil spring; 56. Connecting block; 561. Slot; 6. Gripping component; 61. Adhesive layer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In view of the shortcomings or deficiencies mentioned in the background technology above, this application provides a roll changing device, which aims to reduce the scrap rate of film material between two take-up shafts during automatic roll changing.

[0023] See Figures 1 to 7 As shown, this application embodiment provides a roll changing device, including: The winding mechanism 1 includes a turret 11 that can rotate about its own axis, and winding shafts 12 symmetrically arranged on the turret 11. The swing arm mechanism 2 has its free end extending toward the turret 11 and close to the underside of the take-up shaft 12 on one side. The free end of the swing arm mechanism 2 is provided with a cutter assembly 4 and an elastic tensioning assembly 5. The free end of the elastic tensioning assembly 5 is provided with a gripping component 6 for gripping the film material.

[0024] In the roll-changing device of this application embodiment, the swing arm of the swing arm mechanism 2 is equipped with a cutter assembly 4 and an elastic tensioning assembly 5. The cutter assembly 4 and the elastic tensioning assembly 5 cooperate with each other. While the cutter assembly 4 cuts the film material, the gripping component 6 on the elastic tensioning assembly 5 grips the tail end of the film material on the wound side. During the deceleration and stopping process of the old take-up shaft 12, the elastic tensioning assembly 5 maintains the tension of the film material without interruption by elastically tensioning it, preventing the tail end of the film material from falling and hitting the ground due to centrifugal force, thereby effectively reducing the scrap rate of the film material between the two take-up shafts 12 during automatic roll changing.

[0025] For example, the swing arm mechanism 2 is installed on the left side of the winding mechanism 1. The swing arm of the swing arm mechanism 2 is driven by a cylinder or electric cylinder to swing upward around the left end of the swing arm, and the right end of the swing arm is the free end. The cutter assembly 4 can be a blade fixed at the free end and arranged along the width direction of the film material; the elastic tensioning assembly 5 can be an elastic telescopic rod or an elastic rope; the gripping component 6 can grip the film material by adhesive bonding or vacuum adsorption.

[0026] For example, when using an elastic rope, the direction of its extension and retraction can be constrained by a sleeve; when using an adhesive method, a plate with double-sided adhesive can be used; when using a vacuum adsorption method, a vacuum suction cup connected by a telescopic flexible hose can be used.

[0027] In some alternative embodiments: see Figures 1 to 7As shown in the figure, this application embodiment provides a roll changing device. The two ends of the swing arm mechanism 2 of the roll changing device are respectively provided with guide rollers 21, and the swing arm mechanism 2 is provided with a tape receiving component 3 that cooperates with the cutter assembly 4.

[0028] In the roll-changing device of this application embodiment, guide rollers 21 are rotatably connected to both ends of the swing arm mechanism 2. The central axis of the guide roller 21 at the left end of the swing arm is fixed. The swing arm is driven by a cylinder or electric cylinder to swing upward around the central axis of the guide roller 21 at the left end. During the swinging process, the guide roller 21 at the right end of the swing arm presses the film material towards and close to the take-up shaft 12 on the left side, so that the tape assembly 3 can press the end of the film material to be taken up onto the take-up shaft 12 for adhesion.

[0029] For example, the swing arm can adopt a symmetrical frame structure, which facilitates the installation of the connecting belt assembly 3 and the cutting blade assembly 4 on different sides. The left end of the frame structure can be connected to the external equipment platform through the installation hinge point. The frame structure can swing by means of a cylinder or electric cylinder that is hinged between the frame structure and the external equipment platform.

[0030] It should be noted that after the film material is cut by the cutter assembly 4, it forms a first end and a second end. The first end is the end to be wound and is used to fix it to the take-up shaft 12 above the swing arm; the second end is the end to be wound and is the tail of the wound film material.

[0031] After the left take-up shaft 12 adheres to the end to be wound and begins to wind the film material, the swing arm mechanism 2 is reset by swinging clockwise downwards. The film material wound on the right side is manually unloaded and replaced with a new shaft. The position of the left and right take-up shafts 12 can be switched by rotating the turret 11 of the take-up mechanism 1 counterclockwise by 180 degrees, waiting for the next roll change operation.

[0032] In some alternative embodiments: see Figures 1 to 7 As shown, this application embodiment provides a roll changing device. The tape receiving assembly 3 of the roll changing device includes a first swing arm 31 and a first driving member 32. The first swing arm 31 is rotatably connected to the swing arm of the swing arm mechanism 2. The end of the first swing arm 31 is connected to a pressure roller 33. The first driving member 32 is used to drive the first swing arm 31 to rotate so that the pressure roller 33 presses the film material against the take-up shaft 12.

[0033] In the roll changing device of this application embodiment, the first swing arm 31 of the tape receiving assembly 3 is rotatably mounted on the swing arm of the swing arm mechanism 2 via the rotating shaft 54. One end of the first swing arm 31 is rotatably connected to the pressure roller 33 located between the two guide rollers 21, and the other end is connected to the first driving member 32. The first driving member 32 drives the first swing arm 31 to rotate, thereby driving the pressure roller 33 to press the film material onto the take-up shaft 12 for adhesion.

[0034] For example, the first drive member 32 can be a pneumatic cylinder or an electric cylinder, with its two ends connected to the swing arm and the first swing rod 31 respectively by hinges. The outer surface of the left take-up shaft 12 is covered with double-sided adhesive to facilitate film adhesion.

[0035] When changing rolls, the left take-up shaft 12 starts to rotate. At the same time, after the swing arm of the swing arm mechanism 2 swings upward to the position, the first drive component 32 drives the first swing rod 31 to drive the pressure roller 33 to press the film onto the left take-up shaft 12 for adhesion. At the same time, the cutter assembly 4 cuts the film, realizing roll changing without stopping the machine.

[0036] In some alternative embodiments: see Figures 1 to 7 As shown, this application embodiment provides a roll changing device. The cutter assembly 4 of the roll changing device includes a second swing arm 41 and a second drive member 42. The second swing arm 41 is rotatably connected to the swing arm of the swing arm mechanism 2. A cutter 43 and an elastic tensioning assembly 5 are connected to the second swing arm 41. The second drive member 42 is used to drive the second swing arm 41 to rotate so that the cutter 43 and the elastic tensioning assembly 5 are close to the film material.

[0037] In the roll changing device of this application embodiment, the second swing arm 41 of the cutter assembly 4 is rotatably mounted on the swing arm of the swing arm mechanism 2 via a rotating shaft 54. The cutter 43 is fixedly mounted on the second swing arm 41, and the elastic tensioning assembly 5 is also mounted thereon.

[0038] The second drive unit 42 drives the second swing arm 41 to rotate, which in turn drives the cutter 43 to cut the film material. In conjunction with the tape assembly 3, the end of the film material to be wound is pressed onto the left winding shaft 12 for adhesion. At the same time, the gripping component 6 on the elastic tensioning assembly 5 grips the tail end of the film material on the wound side.

[0039] During the deceleration and stopping process of the right take-up shaft 12, the elastic tensioning component 5 maintains the tension of the film material without interruption by elastically tensioning it, thus preventing the tail of the film material from falling and hitting the ground due to centrifugal force, thereby effectively reducing the scrap rate of the film material between the two take-up shafts 12 during the automatic roll changing process.

[0040] In some alternative embodiments: see Figures 1 to 7 As shown, this application embodiment provides a roll changing device. The elastic tensioning component 5 of the roll changing device includes a storage cylinder 51 and a winding belt 52. The storage cylinder 51 is connected to the second swing rod 41. The winding belt 52 is elastically wound inside the storage cylinder 51. The free end of the winding belt 52 passes through the storage cylinder 51 and is connected to a gripping component 6.

[0041] In the roll changing device of this application embodiment, the storage cylinder 51 of the elastic tensioning component 5 is fixedly connected to the second swing rod 41, and the winding belt 52 is elastically wound inside the storage cylinder 51, with its free end passing through the storage cylinder 51 and connected to the gripping component 6.

[0042] While the film material is being cut by the cutter 43, the gripping component 6 grips the tail of the film material on the completed winding side. The elastic tension of the take-up belt 52 continues to act on the film material, maintaining the tension without interruption, effectively preventing the tail of the film material from falling and hitting the ground due to centrifugal force during the deceleration and stopping of the old take-up shaft 12.

[0043] For example, a coil spring 55 may be provided inside the storage cylinder 51 to provide elastic force, or the winding belt 52 may be made of a highly elastic rubber belt or fabric belt, so that the winding belt 52 can be released out of the storage cylinder 51 after being pulled by the tail of the film material, and the film material is kept taut by the generated elastic recoil force; the gripping component 6 may be designed as a rigid sheet plate with double-sided adhesive to ensure that the film material is gripped firmly.

[0044] In some alternative embodiments: see Figures 1 to 7 As shown, this application embodiment provides a roll changing device. The storage cylinder 51 of the roll changing device is rotatably connected to a rotating shaft 54 ​​via a bearing 53. The end of the take-up belt 52 is connected to and wound onto the rotating shaft 54. The storage cylinder 51 is provided with a strip hole 511 for cooperating in taking up and unwinding the take-up belt 52.

[0045] In the roll changing device of this application embodiment, a rotating shaft 54 ​​is rotatably connected inside the storage cylinder 51 via a bearing 53. The rotating shaft 54 ​​is fixedly connected to the end of the take-up belt 52, and the take-up belt 52 is wound around the rotating shaft 54. The strip hole 511 opened on the storage cylinder 51 facilitates the winding and unwinding of the take-up belt 52, ensuring that while the film material is cut by the cutter 43, the gripping component 6 can reliably grip the tail of the film material on the completed winding side. By releasing the take-up belt 52 out of the storage cylinder 51, the elastic tension of the take-up belt 52 maintains the tension of the film material, preventing the tail of the film material from falling due to centrifugal force.

[0046] For example, the strip hole 511 is a longitudinally elongated hole extending along the axial direction of the storage cylinder 51, which facilitates the free winding and unwinding of the winding belt 52; the winding belt 52 can be made of a highly elastic rubber film belt, which can pull the rotating shaft 54 ​​and the tail of the film material through elastic stretching deformation to tighten the film material and improve the reliability of the roll changing process.

[0047] In some alternative embodiments: see Figures 1 to 7 As shown, this application embodiment provides a roll changing device. A coil spring 55 is sleeved on the rotating shaft 54 ​​of the roll changing device. The inner end of the coil spring 55 is fixed on the rotating shaft 54, and the outer end of the coil spring 55 is fixed on the storage cylinder 51.

[0048] In the roll-changing device of this application embodiment, the coil spring 55 sleeved on the rotating shaft 54 ​​provides continuous tension to the take-up belt 52 through its torsional elastic force. When the cutter 43 cuts the film material, the gripping component 6 reliably grips the tail of the film material on the completed winding side. The elastic force of the coil spring 55 keeps the tension of the film material on the take-up belt 52 uninterrupted, effectively preventing the tail of the film material from falling and hitting the ground due to centrifugal force during the deceleration and stopping process of the right take-up shaft 12.

[0049] For example, the coil spring 55 is made of high-strength stainless steel, with its inner end fixed to the rotating shaft 54 ​​by laser welding and its outer end fixed to the storage cylinder 51 by precision riveting, ensuring uniform and stable elastic force; the winding belt 52 can be made of flexible sheet material that is easy to wind, which, together with the coil spring 55, ensures that the film tension is not interrupted, improving the reliability of the roll changing process and the utilization rate of film material.

[0050] In some alternative embodiments: see Figures 1 to 7 As shown, this application embodiment provides a roll changing device. The gripping component 6 of the roll changing device is connected to the connecting piece at the free end of the take-up tape 52. The connecting piece is provided with an adhesive layer 61 for adhering the film material.

[0051] In the roll-changing device of this application embodiment, the connecting piece is connected to the take-up belt 52, and the surface of the connecting piece is provided with an adhesive layer 61 for adhering the tail of the film material. When the second driving member 42 drives the second swing arm 41 to swing counterclockwise, the second swing arm 41 drives the cutter 43 and the side of the connecting piece with the adhesive layer 61 to simultaneously contact the mold material. This achieves reliable gripping by adhering the tail of the film material on the completed winding side through the adhesive layer 61 while the cutter 43 cuts the film material. This works in conjunction with the take-up belt 52 to maintain the tension of the film material during the deceleration and stopping process of the right take-up shaft 12, preventing the tail of the film material from falling to the ground due to centrifugal force.

[0052] For example, the adhesive layer 61 can be a high-viscosity pressure-sensitive adhesive or double-sided tape, which is evenly attached to the surface of the connecting piece; the connecting piece can be a lightweight hard plastic sheet or cork sheet to ensure a firm bond, and at the same time, it is not easy to fall to the ground with the film material under the elastic tension of the winding belt 52, thereby improving the gripping stability and reliability.

[0053] In some alternative embodiments: see Figures 1 to 7 As shown in the figure, this application embodiment provides a roll changing device. The outer wall of the receiving cylinder 51 of the roll changing device is provided with a connecting block 56. The connecting block 56 is provided with a slot 561 that matches the connecting piece. The opening direction of the slot 561 faces the flow direction of the film material.

[0054] In the roll-changing device of this application embodiment, a slot 561 is provided on the connecting block 56 fixed to the outer wall of the take-up cylinder 51. The opening of the slot 561 faces the flow direction of the film material, and the connecting piece can be inserted into the slot 561 for temporary positioning. When the take-up cylinder 51 moves the connecting piece close to and adheres to the film material, since the opening of the slot 561 faces the flow direction of the film material, the film material can smoothly disengage the connecting piece from the slot 561 during the flow process and pull out the take-up belt 52, thereby maintaining the continuity of tension.

[0055] In some alternative embodiments: see Figures 1 to 7As shown in the figure, this application embodiment provides a roll changing device. The turret 11 of the roll changing device is symmetrically provided with guide shafts 13 that cooperate with the take-up shaft 12. The line of symmetry of the guide shafts 13 is perpendicular to the line of symmetry of the take-up shaft 12.

[0056] In the roll-changing device of this application embodiment, the guide shafts 13 symmetrically arranged on the turret 11 cooperate with the take-up shaft 12 to guide the film material to transition smoothly during the roll-changing process. The symmetry line of the guide shaft 13 is perpendicular to the symmetry line of the take-up shaft 12, ensuring that the film material runs along a preset path when switching the take-up shaft 12, avoiding film material deviation or entanglement, maintaining tension stability, and improving roll-changing accuracy and reliability.

[0057] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0058] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A roll changing device, characterized in that, include: The winding mechanism (1) includes a turret (11) that can rotate about its own axis, and a winding shaft (12) symmetrically arranged on the turret (11). The swing arm mechanism (2) has its free end extending toward the turret (11) and close to the underside of the winding shaft (12) on one side. The free end of the swing arm mechanism (2) is provided with a cutter assembly (4) and an elastic tensioning assembly (5). The free end of the elastic tensioning assembly (5) is provided with a gripping component (6) for gripping the film material.

2. The roll changing device as described in claim 1, characterized in that: The swing arm mechanism (2) has guide rollers (21) at both ends of the swing arm, and a connecting assembly (3) that cooperates with the cutter assembly (4) is provided on the swing arm of the swing arm mechanism (2).

3. The roll changing device as described in claim 2, characterized in that: The tape assembly (3) includes a first swing arm (31) and a first drive member (32). The first swing arm (31) is rotatably connected to the swing arm of the swing arm mechanism (2). The end of the first swing arm (31) is connected to a pressure roller (33). The first drive member (32) is used to drive the first swing arm (31) to rotate so that the pressure roller (33) presses the film material against the take-up shaft (12).

4. The roll changing device as described in claim 1 or 2, characterized in that: The cutter assembly (4) includes a second swing arm (41) and a second drive member (42). The second swing arm (41) is rotatably connected to the swing arm of the swing arm mechanism (2). The cutter (43) and the elastic tensioning assembly (5) are connected to the second swing arm (41). The second drive member (42) is used to drive the second swing arm (41) to rotate so that the cutter (43) and the elastic tensioning assembly (5) are close to the film material.

5. The roll changing device as described in claim 4, characterized in that: The elastic tensioning assembly (5) includes a storage cylinder (51) and a winding belt (52). The storage cylinder (51) is connected to the second swing rod (41). The winding belt (52) is elastically wound inside the storage cylinder (51). The free end of the winding belt (52) passes through the storage cylinder (51) and is connected to the gripping component (6).

6. The roll changing device as described in claim 5, characterized in that: The storage tube (51) is rotatably connected to a rotating shaft (54) via a bearing (53). The end of the winding tape (52) is connected to and wound onto the rotating shaft (54). The storage tube (51) is provided with a strip hole (511) for cooperating in winding and unwinding the winding tape (52).

7. The roll changing device as described in claim 6, characterized in that: A coil spring (55) is sleeved on the rotating shaft (54). The inner end of the coil spring (55) is fixed on the rotating shaft (54), and the outer end of the coil spring (55) is fixed on the storage cylinder (51).

8. The roll changing device as described in claim 5, characterized in that: The gripping component (6) is a connecting piece connected to the free end of the take-up tape (52), and the connecting piece is provided with an adhesive layer (61) for adhering the film material.

9. The roll changing device as described in claim 8, characterized in that: A connecting block (56) is provided on the outer wall of the storage tube (51), and a slot (561) is provided on the connecting block (56) to cooperate with the connecting piece. The opening direction of the slot (561) is towards the flow direction of the film material.

10. The roll changing device as described in claim 1, characterized in that: The turret (11) is symmetrically provided with guide shafts (13) that cooperate with the take-up shaft (12), and the line of symmetry of the guide shaft (13) is perpendicular to the line of symmetry of the take-up shaft (12).

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