Lithium battery film feeding mechanism

Abstract

The utility model discloses a lithium battery film feeding mechanism which comprises a support, a film sleeving shaft, a film jacking assembly, a clamping assembly and a driving assembly, the film jacking assembly is arranged on the support, the clamping assembly is arranged at the driving end of the driving assembly, and the distance between the clamping assembly and the film feeding end is larger than the distance between the clamping assembly and the film jacking assembly. The two ends of the film sleeving shaft are the film inlet end and the film outlet end respectively, and before the glue film is fed, the glue film can enter the film sleeving shaft from the film inlet end of the film sleeving shaft and is arranged on the film sleeving shaft in a sleeving mode. In the adhesive film feeding process, the film jacking assembly can abut against an adhesive film, so that the adhesive film is flat, and the adhesive film conveying quality is improved; and then the clamping assembly clamps the flattened adhesive film, the clamping assembly and the adhesive film are driven by the driving assembly to move in the axial direction of the film sleeving shaft together, automatic conveying of the adhesive film is achieved, and the conveying efficiency of the adhesive film is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a lithium battery film feeding mechanism. Background Art

[0002] Feeding and cutting the film casing is an important step in the production process of cylindrical lithium batteries. After the batteries are produced by the automated line, they are cleaned by a cleaning machine. Because the filling port of the lithium-ion battery is at the positive electrode of the battery, the battery needs to be kept stationary with the positive electrode facing up and the negative electrode facing down after cleaning, so that the battery electrolyte is fully mixed. After the standing still is completed, the lithium battery is filmed, that is, the battery shell is wrapped with a film to complete the packaging of the lithium battery.

[0003] Currently, the film coating process is typically manual, requiring manual feeding of the film, cutting it to the desired length, and then coating the cylindrical battery. However, manual film feeding is inefficient in large-scale battery production and cannot meet the demands of efficient production. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the present application provides a lithium battery film feeding mechanism that can automatically feed the film to improve the film feeding efficiency.

[0005] This embodiment adopts the following technical solutions:

[0006] A lithium battery film feeding mechanism, comprising:

[0007] Bracket;

[0008] The film shaft is covered with a film and is provided with a film inlet end and a film outlet end;

[0009] A top film assembly is provided on the bracket and is used to press the film tightly against the film sleeve shaft;

[0010] a clamping assembly, disposed on the bracket, for clamping the adhesive film, wherein the clamping assembly is farther from the film inlet end than the top film assembly; and

[0011] The driving assembly is transmission-connected to the clamping assembly and is used to drive the clamping assembly to move along the axial direction of the film shaft.

[0012] Furthermore, in the lithium battery film feeding mechanism, the number of the top film components is set to two or more, and they are circumferentially surrounded by the film sleeve shaft.

[0013] Furthermore, in the lithium battery film feeding mechanism, the top film assembly includes a slide and a top wheel, the slide is arranged on the bracket, and the distance between the slide and the film shaft is adjustable, and the top wheel is rotatably arranged on the slide.

[0014] Furthermore, in the lithium battery film feeding mechanism, a positioning ring is provided on the bracket, and the positioning ring is coaxial with the film sleeve shaft. The top film assembly also includes an elastic member and an abutment member. The elastic member is provided between the slide and the positioning ring, and the abutment member is provided on the slide. The inner side surface of the positioning ring is an inclined surface or an arc surface, and abuts against the abutment member, and the distance between the positioning ring and the bracket is adjustable.

[0015] Furthermore, the lithium battery film feeding mechanism also includes a mounting frame and an adjustment drive component. The mounting frame is arranged on the bracket, the positioning ring is slidably arranged on the mounting frame, and the adjustment drive component is transmission-connected to the positioning ring to drive the positioning ring to slide and approach / move away from the bracket.

[0016] Furthermore, in the lithium battery film feeding mechanism, the adjustment drive component is a differential head, the differential head is arranged on the mounting frame, and the movable end of the differential head is transmission-connected to the positioning ring.

[0017] Furthermore, in the lithium battery film feeding mechanism, a positioning groove is provided on the positioning ring, and the number of the positioning grooves is the same as the number of the top film assemblies. One end of the elastic member is arranged in the positioning groove and abuts against the positioning ring, and the other end of the elastic member abuts / connected to the slide seat.

[0018] Furthermore, in the lithium battery film feeding mechanism, a plurality of rollers are provided on the film sleeve shaft, the rolling surfaces of the rollers protrude from the surface of the film sleeve shaft, and the rotation center lines of the rollers are perpendicular to the axis of the film sleeve shaft.

[0019] Furthermore, in the lithium battery film feeding mechanism, the clamping assembly includes a connecting frame, a cylinder, a first connecting rod, a second connecting rod, a first clamp and a second clamp. The connecting frame and the cylinder are both arranged at the driving end of the driving assembly. One end of the first connecting rod and one end of the second connecting rod are coaxially connected to the piston rod of the cylinder, the other end of the first connecting rod is rotationally connected to the first clamp, and the other end of the second connecting rod is rotationally connected to the second clamp. The first clamp and the second clamp are also coaxially connected to the connecting frame.

[0020] Furthermore, in the lithium battery film feeding mechanism, the driving assembly includes a servo motor, a lead screw and a lead screw nut, the lead screw is connected to the servo motor, the lead screw nut is installed on the lead screw, and the lead screw nut is connected to the clamping assembly.

[0021] Compared with the existing technology, the present application provides a lithium battery film feeding mechanism, in which the film can enter from the film inlet end of the film sleeve shaft, and then the top film assembly pushes against the film to make the film flat, thereby improving the quality of film feeding; the flattened film is then clamped by the clamping assembly, and the clamping assembly is driven by the driving assembly to move together with the film along the axial direction of the film sleeve shaft, thereby realizing automatic feeding of the film and improving the feeding efficiency of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the lithium battery film feeding mechanism provided in this application.

[0023] Figure 2 for Figure 1 Schematic diagram of the partial structure of the lithium battery film feeding mechanism shown.

[0024] Figure 3 for Figure 1 The diagram shows the structure of the top membrane assembly in the lithium battery membrane feeding mechanism.

[0025] Figure 4 for Figure 1 The schematic diagram of the structure of the positioning ring in the lithium battery film feeding mechanism is shown.

[0026] Figure 5 for Figure 1 The diagram shows the structure of the film shaft in the lithium battery film feeding mechanism.

[0027] Figure 6 for Figure 1 The schematic diagram of the structure of the clamping assembly in the lithium battery film feeding mechanism is shown.

[0028] Among them, 10, bracket; 20, film sleeve shaft; 21, roller; 30, top film assembly; 31, slide; 32, top wheel; 33, elastic member; 34, abutment; 40, clamping assembly; 41, connecting frame; 411, rotating shaft; 42, cylinder; 43, first connecting rod; 44, second connecting rod; 45, first clamping jaw; 46, second clamping jaw; 50, driving assembly; 51, servo motor; 52, lead screw; 53, lead screw nut; 60, positioning ring; 61, inner side; 62, positioning groove; 70, mounting frame; 80, adjusting driving member; 100, film cutting mechanism. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and effects of this application more clear and explicit, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. Without further description, the elements, structures, and features of one embodiment may also be beneficially combined with other embodiments.

[0030] It should be noted that when a metastructure is referred to as being "fixed to" or "disposed on" another metastructure, it can be directly on the other metastructure or indirectly on the other metastructure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to.

[0031] The orientation or positional relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" 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 structure referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0032] See also Figure 1 The lithium battery film feeding mechanism provided in this application includes a bracket 10, a film sleeve shaft 20, a top film assembly 30, a clamping assembly 40 and a driving assembly 50. The film sleeve shaft 20 is covered with a film, the top film assembly 30 is arranged on the bracket 10, and the clamping assembly 40 is arranged at the driving end of the driving assembly 50.

[0033] The film shaft 20 has a film inlet and a film outlet at either end. The film enters the film inlet and is placed on the shaft 20, then exits the film outlet. During film feeding, the film shaft 20 can be secured by an external mechanism to maintain relative stationary contact with the support 10. The film inlet of the film shaft 20 can be tapered to facilitate film entry.

[0034] When the film is delivered, creases or wrinkles may appear due to factors such as film quality and storage methods. Also, during the film conveying process, creases or wrinkles may appear due to uneven friction. The film pusher assembly 30 is located near the film feed end and is used to press the film against the film sleeve shaft 20, making the film smooth and improving the quality of film conveying.

[0035] The clamping assembly 40 is positioned in front of the top film assembly 30, i.e., it is located further from the film inlet than the top film assembly 30. The clamping assembly 40 is used to clamp the film after it has been smoothed by the top film assembly 30. The drive assembly 50 then drives the clamping assembly 40 and the film to move axially along the film sleeve shaft 20, achieving automated film transport and improving film transport efficiency.

[0036] It is understood that the lithium battery film feeding mechanism can be applied to lithium battery feeding, cutting and sleeve film production lines to achieve large-scale automatic sleeve film production of lithium batteries. The feeding and sleeve film production process includes: feeding lithium batteries onto a conveyor belt, which then transports large cylindrical lithium batteries to the sleeve film cutting station for sleeve filming. The sleeve film cutting process includes: film placement, film loading, sleeve rods, film feeding, cutting, and sleeve filming.

[0037] Among them, during the lithium battery loading process, the cylindrical lithium batteries in the loading box can be pushed one by one to the conveyor belt through the cylinder, and then the cylindrical lithium batteries are transported to the film covering position through the conveyor belt, and the film covering mechanism here is used for automatic film covering.

[0038] During the film feeding process, the film on the material rack can be pulled out manually or mechanically, passed through a suitable turning roller, and then enters from the film inlet end of the film sleeve shaft 20, so that the film passes through the top film assembly 30 and is clamped by the clamping assembly 40, and then the driving assembly 50 provides power to move the film.

[0039] Before the film leaves the film outlet, a film cutting mechanism 100 can be installed. During the film feeding process, the film cutting mechanism 100 can be used to maintain the position of the film sleeve shaft 20. After the film is delivered to the right position, the film cutting mechanism 100 can be used to cut the film to provide a film of the required size and allow the film to leave the film outlet. Then, the drive assembly 50 can drive the clamping assembly 40 to return to the initial clamping position, re-clamp the film, and send the film to the film cutting position to complete the next film cutting.

[0040] The conveyor belt can be set below the film outlet end, and the film sleeve mechanism will sleeve the cut film on the lithium battery to realize automatic feeding and cutting of cylindrical lithium batteries. The whole process can effectively reduce labor costs and significantly improve the efficiency of feeding and cutting film sleeves.

[0041] See also Figure 2 In some embodiments, the number of top film assemblies 30 can be set to two or more, and they can be circumferentially arranged around the film shaft 20 to evenly press the film from different directions, thereby improving the overall flatness of the film after it passes through the top film assembly 30.

[0042] like Figure 2 As shown, the number of the top film assemblies 30 can be set to four, which are arranged around the four sides of the film sleeve shaft 20 at a 90-degree interval, and press the film on the film sleeve shaft 20 from four directions.

[0043] See also Figure 3 In some embodiments, the top film assembly 30 includes a slide 31 and a top wheel 32 . The slide 31 is disposed on the bracket 10 , and the distance between the slide 31 and the film sleeve shaft 20 is adjustable. The top wheel 32 is rotatably disposed on the slide 31 .

[0044] During the movement of the film, the top wheel 32 and the film can roll relative to each other to reduce the friction force on the film, so that the film is not prone to wrinkling during movement.

[0045] The slide 31 is slidably arranged on the bracket 10, and a corresponding adjustment device can be provided to determine the position of the slide 31, so that the distance between the slide 31 and the film covering shaft 20 can be adjusted, and then the distance between the top wheel 32 and the film covering shaft 20 can be adjusted, so that the top wheel 32 is in a suitable position to better smooth the moving film.

[0046] The corresponding adjustment device can adopt a screw module, by setting each slide 31 on the corresponding screw, and rotating the screw to adjust the position of the slide 31, thereby adjusting the distance between the top wheel 32 and the film shaft 20. Of course, the corresponding adjustment device can also adopt other common distance adjustment methods.

[0047] See also Figure 2 and Figure 4 In some embodiments, a positioning ring 60 is provided on the bracket 10, and the positioning ring 60 is coaxial with the film sleeve shaft 20. The top film assembly 30 further includes an elastic member 33 and an abutment member 34. The elastic member 33 is provided between the slide 31 and the positioning ring 60, and the abutment member 34 is provided on the slide 31. The inner side surface 61 of the positioning ring 60 is an inclined surface or an arc surface ( Figure 4 The positioning ring 60 is flipped over and abuts against the abutment member 34 , and the distance between the positioning ring 60 and the bracket 10 is adjustable.

[0048] A corresponding adjustment device can also be provided on the bracket 10 to determine the position of the positioning ring 60, so that the distance between the positioning ring 60 and the bracket 10 can be adjusted, thereby making the inclined surface or arc surface on the inner side of the positioning ring 60 contact the abutment 34 at different locations, which will push the abutment 34 to slide together with the connecting slide 31, thereby achieving the purpose of adjusting the distance between the top wheel 32 and the membrane shaft 20.

[0049] The corresponding adjustment device can adopt a screw module, by setting the positioning ring 60 on the corresponding screw, and rotating the screw to adjust the position of the positioning ring 60, thereby adjusting the distance between the positioning ring 60 and the bracket 10. Of course, the corresponding adjustment device can also adopt other common distance adjustment methods.

[0050] The elastic member 33 is used to generate elastic force between the slide 31 and the positioning ring 60 to elastically press the top wheel 32 on the slide 31 against the film, or to ensure that the abutment member 34 abuts against the inner side surface 61 of the positioning ring 60 .

[0051] Specifically, the slide 31 can adopt an L-shaped structure, and a corresponding guide groove can be opened on the bracket 10, so that the lower part of the slide 31 is located below the positioning ring 60, and is installed in the guide groove to ensure that the sliding direction of the slide 31 is along the radial direction of the positioning ring 60; the elastic member 33 can be arranged between the upper part of the slide 31 and the outer side of the mounting ring.

[0052] When the two ends of the elastic member 33 are respectively abutted or connected to the slide 31 and the mounting ring, and the elastic member 33 generates an expanding elastic force, the elastic member 33 can push the slide 31 to move away from the film shaft 20, so that the inner side of the positioning ring 60 is pressed against the abutment member 34, ensuring that the distance between the adjustment top wheel 32 and the film shaft 20 remains unchanged.

[0053] When the two ends of the elastic member 33 are respectively connected to the slide 31 and the mounting ring, and the elastic member 33 generates a contraction force, the elastic member 33 can push the slide 31 to move toward the film shaft 20, so that the top wheel 32 elastically presses the film against the film shaft 20, and the distance between the top wheel 32 and the film shaft 20 is limited by the abutment member 34.

[0054] The elastic member 33 may be a common spring structure, or other elastic structures capable of generating elastic force, such as a spring sheet, or an elastic material capable of generating elastic force, such as an elastomeric material.

[0055] The abutment 34 can be a wheel. Since the inner side of the positioning ring 60 is a circle as a whole and is processed into an inclined surface, the abutment 34 that matches it is difficult to make and the cost is high. The abutment 34 is selected as a standard purchased wheel, which is low in cost and good in effect.

[0056] In some embodiments, the lithium battery film feeding mechanism further includes a mounting frame 70 and an adjustment drive member 80 . The mounting frame 70 is disposed on the bracket 10 , the positioning ring 60 is slidably disposed on the mounting frame 70 , and the adjustment drive member 80 is transmission-connected to the positioning ring 60 .

[0057] At this time, under the driving action of the adjustment drive member 80, the positioning ring 60 can slide along the mounting frame 70, moving it away from / closer to the bracket 10, thereby changing the abutment position between the inner side of the positioning ring 60 and the abutment member 34, thereby adjusting the distance between the positioning ring 60 and the bracket 10.

[0058] The adjustment drive member 80 can be manually driven or mechanically driven, for example, by manually rotating a top screw for adjustment, or by a motor driving a lead screw for adjustment, etc.

[0059] Specifically, the adjustment drive member 80 may be a differential head, which is disposed on the mounting bracket 70 , and the movable end of the differential head is transmission-connected to the positioning ring 60 .

[0060] When the knob of the micrometer head is rotated, the positioning ring 60 can move along the axial direction of the membrane shaft 20, so that the positioning ring 60 approaches or moves away from the surface of the bracket 10. Due to the high precision of the micrometer head, not only can the mechanism be fine-tuned, but the micrometer head also has a scale that can record the debugging status. Based on this data, the optimal position can be found and it can serve as a guide for subsequent equipment debugging.

[0061] In some embodiments, a positioning groove 62 may be opened on the positioning ring 60, and the number of positioning grooves 62 is the same as the number of top membrane assemblies 30. One end of the elastic member 33 is arranged in the positioning groove 62 and abuts against the positioning ring 60, and the other end of the elastic member 33 abuts / connected to the slide seat 31.

[0062] When the positioning ring 60 slides up and down along the mounting bracket 70 , the positioning groove 62 can limit the position of the elastic member 33 to prevent the elastic member 33 from being deflected due to lateral force, ensuring that the end of the spring abuts against the positioning ring 60 .

[0063] See also Figure 5 A plurality of rollers 21 may be provided on the film sleeve shaft 20 , wherein the rolling surfaces of the rollers 21 protrude from the surface of the film sleeve shaft 20 , and the rotation center lines of the rollers 21 are perpendicular to the axis of the film sleeve shaft 20 .

[0064] The roller 21 is used to reduce friction between the surface of the film sleeve shaft 20 and the film, facilitating film conveyance. Furthermore, the roller 21 can be positioned close to the top wheel 32, so that the roller 21 and the top wheel 32 are nearly tangential to each other, further preventing wrinkles in the film during flattening.

[0065] See also Figure 6 In some embodiments, the clamping assembly 40 includes a connecting frame 41, a cylinder 42, a first connecting rod 43, a second connecting rod 44, a first clamping jaw 45 and a second clamping jaw 46. The connecting frame 41 and the cylinder 42 are both arranged at the driving end of the driving assembly 50. One end of the first connecting rod 43 and one end of the second connecting rod 44 are coaxially connected to the piston rod of the cylinder 42. The other end of the first connecting rod 43 is rotatably connected to the first clamping jaw 45. The other end of the second connecting rod 44 is rotatably connected to the second clamping jaw 46. The first clamping jaw 45 and the second clamping jaw 46 are also coaxially connected to the connecting frame 41.

[0066] Specifically, the connecting member is provided with a rotating shaft 411, and the first clamping jaw 45 and the second clamping jaw 46 can be simultaneously mounted on the rotating shaft 411. The rotating shaft 411 is located in front of the piston rod of the cylinder 42. When the piston rod of the cylinder 42 is extended, the distance between the piston rod and the rotating shaft 411 is shortened, and the first connecting rod 43, the second connecting rod 44, the first clamping jaw 45 and the second clamping jaw 46 between the piston rod and the rotating shaft 411 will move outward, causing the first clamping jaw 45 and the second clamping jaw 46 to move away from each other, thereby opening the clamping ends of the first clamping jaw 45 and the second clamping jaw 46.

[0067] When the piston rod of the cylinder 42 retracts, the distance between the piston rod and the rotating shaft 411 is increased, and the first connecting rod 43, the second connecting rod 44, the first clamping jaw 45 and the second clamping jaw 46 between the piston rod and the rotating shaft 411 will move inward, so that the first clamping jaw 45 and the second clamping jaw 46 approach each other, so that the clamping ends of the first clamping jaw 45 and the second clamping jaw 46 are closed, and the clamping surfaces of the first clamping jaw 45 and the second clamping jaw 46 can be set to be arc surfaces corresponding to the film shaft 20, so that the first clamping jaw 45 and the second clamping jaw 46 jointly clamp the film to drive the film to move.

[0068] Of course, the clamping assembly 40 may also adopt other methods to clamp the film, such as using two independent driving assemblies to respectively drive the first clamping jaw 45 and the second clamping jaw 46 to rotate, or adopt other common clamping methods.

[0069] In some embodiments, the driving assembly 50 may include a servo motor 51, a screw 52 and a screw nut 53. The screw is connected to the drive shaft of the servo motor 51 through a coupling. The screw nut 53 is arranged on the screw 52 and is connected to the connecting frame 41 and the cylinder 42, so that the servo motor 51 can drive the screw 52 to rotate, and then drive the clamping assembly 40 to move axially along the sleeve shaft 20 through the movement of the screw nut 53.

[0070] Furthermore, in order to improve the stability of movement, a guide assembly can be provided. For example, a guide rail is provided on the equipment frame, and the connecting frame 41 is connected to the slide block on the guide rail to guide the movement of the clamping assembly 40.

[0071] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and application concept of this application, and all these changes or substitutions should fall within the scope of protection of the claims attached to this application.

Claims

1. A lithium battery film feeding mechanism, characterized in that: include: Bracket; The film shaft is covered with a film and is provided with a film inlet end and a film outlet end; A top film assembly is provided on the bracket and is used to press the film tightly against the film sleeve shaft; A clamping assembly, provided on the bracket, for clamping the adhesive film, wherein the clamping assembly is farther from the film inlet end than the top film assembly; as well as The driving assembly is transmission-connected to the clamping assembly and is used to drive the clamping assembly to move along the axial direction of the film shaft.

2. The lithium battery film feeding mechanism according to claim 1, characterized in that: The number of the top membrane components is set to two or more, and they surround the membrane shaft in a circle.

3. The lithium battery film feeding mechanism according to claim 1, characterized in that: The top film assembly includes a slide and a top wheel. The slide is arranged on the bracket, and the distance between the slide and the film shaft is adjustable. The top wheel is rotatably arranged on the slide.

4. The lithium battery film feeding mechanism according to claim 3, characterized in that: A positioning ring is provided on the bracket, and the positioning ring is coaxial with the sleeve membrane shaft. The top membrane assembly also includes an elastic member and an abutment member. The elastic member is provided between the slide and the positioning ring, and the abutment member is provided on the slide. The inner side surface of the positioning ring is an inclined surface or an arc surface, and abuts against the abutment member, and the distance between the positioning ring and the bracket is adjustable.

5. The lithium battery film feeding mechanism according to claim 4, characterized in that: It also includes a mounting frame and an adjustment drive member, the mounting frame is arranged on the bracket, the positioning ring is slidably arranged on the mounting frame, and the adjustment drive member is transmission-connected to the positioning ring to drive the positioning ring to slide and approach / move away from the bracket.

6. The lithium battery film feeding mechanism according to claim 5, characterized in that: The adjustment drive component is a differential head, which is arranged on the mounting frame, and the movable end of the differential head is transmission-connected to the positioning ring.

7. The lithium battery film feeding mechanism according to claim 5, characterized in that: The positioning ring is provided with positioning grooves, the number of which is the same as the number of the top membrane assemblies. One end of the elastic member is arranged in the positioning groove and abuts against the positioning ring, and the other end of the elastic member abuts / connects to the slide seat.

8. The lithium battery film feeding mechanism according to claim 1, characterized in that: The film sleeve shaft is provided with a plurality of rollers, the rolling surfaces of the rollers protrude from the surface of the film sleeve shaft, and the rotation center lines of the rollers are perpendicular to the axis of the film sleeve shaft.

9. The lithium battery film feeding mechanism according to claim 1, characterized in that: The clamping assembly includes a connecting frame, a cylinder, a first connecting rod, a second connecting rod, a first clamp and a second clamp. The connecting frame and the cylinder are both arranged at the driving end of the driving assembly. One end of the first connecting rod and one end of the second connecting rod are coaxially connected to the piston rod of the cylinder, the other end of the first connecting rod is rotationally connected to the first clamp, and the other end of the second connecting rod is rotationally connected to the second clamp. The first clamp and the second clamp are also coaxially connected to the connecting frame.

10. The lithium battery film feeding mechanism according to claim 1, characterized in that: The driving assembly includes a servo motor, a lead screw and a lead screw nut. The lead screw is connected to the servo motor, the lead screw nut is installed on the lead screw, and the lead screw nut is connected to the clamping assembly.

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