Diaphragm slitting machine and continuous film cutting device

Abstract

The utility model discloses a diaphragm slitting machine and continuous film cutting device belongs to lithium battery diaphragm slitting equipment technical field. The film cutting device includes the knife rest and the knife rest support seat, is equipped with N cutters that follow the circumferential direction interval distribution on the knife rest, wherein N is 3, and the knife rest rotation drives N cutters to enter the film cutting area in turn, the cutting angle of single cutter is theta 1, the included angle between single cutter and the cutter that immediately enters the film cutting area is theta 2, theta 1 is greater than theta 2, make the knife rest relative to the rotation process of knife rest support seat, at least one cutter carries out the cutting of film. The scheme is through the layout optimization design of multiple cutters on the knife rest, not only realizes the continuity of film cutting in the process of changing cutter, and, still can effectively guarantee the film cutting quality during changing cutter. In addition, further reduce the equipment occupied space.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery separator slitting equipment, and more specifically, to a separator slitting machine and a continuous film cutting device. Background Technology

[0002] In the production process of lithium-ion battery separators, after the heat setting process, the edge material needs to be trimmed before winding to reduce winding abnormalities caused by the thickness difference between the edge material and the rest of the separator. Traditional edge trimming devices mainly consist of a cutter and a cutter holder, with the cutter directly mounted on the cutter holder, which is then mounted on the frame of the separator production line.

[0003] In the membrane production process, the cutter typically operates 24 hours a day. After long-term use, it will wear down, resulting in uneven edges on the membrane cut by the cutter, or even causing the entire membrane to break. Therefore, the cutter needs to be replaced in a timely manner.

[0004] The blade-changing mechanisms used in existing continuous film-cutting devices are relatively complex and struggle to effectively guarantee film-cutting quality during blade changes. For example, Chinese patent application CN 120228763 A discloses an automatic diaphragm edge-cutting device. Its cutting unit includes a slide rail, a slider, a blade holder, a main cutter, a spare cutter, a first support, a second support, and a controller. It automatically changes the main cutters by arranging multiple main cutters circumferentially on the blade holder and rotating it via a first motor. During main cutter replacement, the spare cutter located below the main cutter is activated for cutting. While this type of application ensures film-cutting continuity to some extent, the cutting gaps of the spare cutter and the main cutter are difficult to perfectly align, leading to product defects or film breakage. Furthermore, both the main cutter and the spare cutter require corresponding cylinder drives, and the combination of the main and spare cutters is complex, resulting in a relatively large overall structure and space requirement. Utility Model Content

[0005] 1. Technical problems to be solved This invention proposes a diaphragm slitting machine and a continuous film cutting device. This solution optimizes the layout of multiple cutters on the blade holder, achieving not only continuous film cutting during blade changes but also effectively ensuring the cutting quality during these changes. Furthermore, it eliminates the need for spare cutters and their associated drive mechanisms, further simplifying the equipment and reducing its space requirements.

[0006] 2. Technical solutions adopted To achieve the above objectives, the technical solution provided by this utility model is as follows: The first aspect of this utility model provides a continuous film cutting device, including a blade holder and a blade holder support. The blade holder is rotatably mounted on the blade holder support, wherein: the blade holder is provided with N cutters spaced apart along the circumferential direction, where N≥3; the rotation of the blade holder drives the N cutters to enter the film cutting area sequentially; the cutting angle of a single cutter is θ1, and the angle between a single cutter and the next cutter entering the film cutting area is θ2, where θ1>θ2, so that during the rotation of the blade holder relative to the blade holder support, at least one cutter cuts the film.

[0007] Furthermore, the tool holder includes a fixedly connected tool holder disk and a connecting shaft, with the connecting shaft rotatably mounted on the tool holder support; N cutting blades are evenly distributed on the tool holder disk.

[0008] Furthermore, a cutting blade positioning seat is provided on one side of the blade holder disk, and the cutting blade positioning seat has N positioning grooves corresponding to N cutting blades, which are used to position the installation position of the cutting blades relative to the blade holder disk.

[0009] Furthermore, the positioning groove includes two positioning surfaces arranged at right angles, and an avoidance groove is provided at the intersection of the two positioning surfaces, with the end of the blade extending into the avoidance groove.

[0010] Furthermore, the cutter is fixedly mounted on the cutter holder disc by a clamping block and a locking screw; the adjacent sides of the clamping block are respectively fitted with the positioning surface in the positioning groove, and the end extends into the interior of the clearance groove.

[0011] Furthermore, the cutter is a rectangular thin sheet structure, and its long side is provided with a cutting edge; the cutter has symmetrical oblique cuts at two opposite vertices.

[0012] Furthermore, the number of cutters N ≥ 7, and when a single cutter moves to the cutting endpoint, the blade is in an approximately horizontal state.

[0013] Furthermore, the tool holder support is provided with an opening slot, and the end of the connecting shaft away from the tool holder disc is rotatably installed in the opening slot of the tool holder support by an adjusting screw, and the position of the adjusting screw relative to the tool holder support is locked by a fastening screw.

[0014] Furthermore, both sides of the tool holder disk are provided with connecting shafts, and the connecting shafts are provided with slots located on both sides of the tool holder disk. The slots are used to install protective covers.

[0015] The second aspect of this utility model provides a diaphragm slitting machine, which includes an unwinding mechanism, a slitting mechanism, and a rewinding mechanism. The slitting mechanism includes an upper blade assembly, a lower blade assembly, and a cutting blade rotation mechanism for driving the upper blade assembly and the lower blade assembly to rotate. The upper blade assembly includes a blade shaft and a plurality of blade holders spaced apart outside the blade shaft. The blade holders are provided with N cutting blades spaced apart along the circumferential direction, where N≥3. The cutting blade rotation mechanism drives the N cutting blades to rotate and enter the film cutting area in sequence. The cutting angle of a single cutting blade is θ1, and the angle between a single cutting blade and the next cutting blade entering the film cutting area is θ2, where θ1>θ2, so that during the rotation of the blade holder with the blade shaft, at least one cutting blade cuts the film.

[0016] Compared with the prior art, the technical solution provided by this utility model has the following advantages: (1) This utility model optimizes the layout of multiple cutters on the cutter holder, specifically, θ1 > θ2, so that during the rotation of the cutter holder relative to the cutter holder support, at least one cutter cuts the film. That is, as the previous cutter continues to rotate, before it reaches the cutting endpoint, the next cutter immediately following it has already entered the film cutting area, thus ensuring the continuity of film cutting during the cutter change process. At the same time, the structure of this film cutting and cutter changing device is simpler. More importantly, it can effectively ensure the overlap of the cutting gaps of the two, thereby effectively ensuring the film cutting quality during the cutter change.

[0017] (2) The present invention further optimizes the specific structure of the cutter positioning seat. Specifically, the positioning groove includes two positioning surfaces arranged at right angles, and an avoidance groove is provided at the intersection of the two positioning surfaces. On the one hand, it facilitates the processing of the positioning groove itself, and on the other hand, it can provide the avoidance space required for the installation of the cutter and the clamping block.

[0018] (3) This utility model further optimizes the connection method of the tool holder being rotatably mounted on the tool holder support. Specifically, the tool holder support is provided with an opening slot. The end of the connecting shaft away from the tool holder disc is rotatably mounted in the opening slot of the tool holder support by an adjusting screw. The position of the adjusting screw relative to the tool holder support is locked by a fastening screw. Loosen the fastening screw between the adjusting screw and the tool holder support; then rotate the adjusting screw to drive the connecting shaft and the cutting blade on it to the appropriate position, and finally tighten the fastening screw. This tool changing adjustment process is simpler. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the continuous film cutting device according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the planar structure of the continuous film cutting device according to an embodiment of the present invention. Figure 1 .

[0021] Figure 3 This is a schematic diagram of the planar structure of the continuous film cutting device according to an embodiment of the present invention. Figure 2 .

[0022] Figure 4 This is a schematic diagram of the cutting angle of the cutter in the continuous film cutting device according to an embodiment of the present invention.

[0023] Figure 5 This is a three-dimensional structural schematic diagram of the continuous film cutting device according to another embodiment of the present invention.

[0024] Figure 6 This is a three-dimensional structural diagram of the blade holder in the continuous film cutting device according to an embodiment of the present invention.

[0025] Figure 7 This is a front view schematic diagram of the blade holder in the continuous film cutting device according to an embodiment of this utility model.

[0026] Figure 8 This is a side view of the blade holder in the continuous film cutting device according to an embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of the overall three-dimensional structure of the continuous film cutting device according to an embodiment of the present invention.

[0028] Label Explanation: 1. Tool holder; 101. Connecting shaft; 102. Tool holder body; 103. Cutting blade positioning seat; 1031. Positioning groove; 1032. Clearance groove; 104. Slot; 2. Clamping block; 3. Locking screws; 4. Cutting knife; 401. Blade; 402. Bevel cut; 5. Tool holder support; 6. Adjusting screw; 7. Protective cover. Detailed Implementation

[0029] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0030] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0031] The explanation of the cutting angle θ1 is as follows: For a single cutter 4, during the rotation of the cutter holder 1, the first intersection between its single-edge and the plane containing the film A to be cut is as follows: Figure 4 The solid line indicates the position of cutter 4. This position is the starting point for cutting by cutter 4. The cutting continues until the blade completely leaves the film plane. (Refer to...) Figure 4 The position of cutter 4, indicated by the dashed line, is the cutting endpoint of cutter 4. The angle formed between these two positions relative to the center of rotation is called the cutting angle θ1. The center of rotation of cutter 4 is the center of the blade holder disk 102. The fan-shaped area swept by the cutter from its cutting start point to its cutting endpoint is called the cutting area of ​​a single cutter 4.

[0032] The angle between a single cutter 4 and the next cutter 4 that enters the cutting area is θ2, which refers to the angle between the corresponding points of the two cutters 4 and the center of the cutter holder disk 102.

[0033] This embodiment describes a continuous film cutting device, as shown in the reference. Figures 1-4 As shown, the blade changing device includes a blade holder 1 and a blade holder base 5. The blade holder 1 is provided with N cutters 4 spaced apart along the circumferential direction, where N≥3. The blade holder 1 rotates, causing the N cutters 4 to enter the film cutting area in sequence. The cutting angle of a single cutter 4 is θ1, and the angle between a single cutter 4 and the next cutter 4 that enters the film cutting area is θ2, where θ1>θ2. This ensures that during the rotation of the blade holder 1 relative to the blade holder support 5, at least one cutter 4 cuts the film.

[0034] During the process of a single cutter 4 rotating from the cutting start point to the cutting end point, the next cutter 4 that enters the film cutting area also rotates by the same angle. Since θ1 > θ2, the next cutter 4 that enters the film cutting area must cross its cutting start point and enter the film cutting area. That is, during the rotation of the cutter holder 1 relative to the cutter holder support 5, at least one cutter 4 cuts the film.

[0035] refer to Figure 2 As shown in the figure, A represents the film to be cut. During the blade change process, the blade holder 1 rotates clockwise. Before the upper blade has reached its cutting endpoint, the next blade following the upper blade has already moved to its cutting starting point and entered the film cutting area.

[0036] refer to Figure 3 As shown in the figure, A represents the film to be cut. As the upper cutter continues to rotate, when it reaches the cutting endpoint, the next cutter 4 that follows it has entered the film cutting area. At this time, the lower cutter 4 moves to the area between its cutting start point and cutting endpoint.

[0037] This invention achieves continuous film cutting during blade changing through the layout design of multiple cutting blades 4 on the blade holder. Moreover, compared with other methods of achieving continuous film cutting mentioned in the background art, the structure of this continuous film cutting device is simpler. More importantly, because the worn blade and the newly entered cutting area are located on the same plane of the blade holder 1, the overlap of the corresponding cutting slits of the two blades can be effectively guaranteed, thereby effectively ensuring the film cutting quality during blade changing.

[0038] In this preferred embodiment, at most two cutters 4 are simultaneously located within their respective cutting areas, meaning that the plane containing the film A to be cut intersects with at most two cutters 4 at the same time.

[0039] Generally, the tool holder 1 includes a fixedly connected tool holder disk 102 and a connecting shaft 101. The connecting shaft 101 is rotatably mounted on the tool holder support 5. N cutters 4 are evenly distributed on the tool holder disk 102. The even arrangement of the N cutters 4 on the tool holder disk 102 facilitates the determination of the relative positions between each cutter 4. At this time, the included angle between a single cutter 4 and the cutters 4 on its adjacent sides is equal, which is θ2.

[0040] For details, please refer to Figure 6 , 7 As shown, a cutter positioning seat 103 is provided on one side of the cutter holder disk 102. The cutter positioning seat 103 has N positioning grooves 1031 corresponding to N cutters 4, which are used to position the cutter 4 relative to the installation position of the cutter 4 relative to the cutter holder disk 102.

[0041] Specifically, the positioning groove 1031 includes two positioning surfaces arranged at right angles, and a clearance groove 1032 is provided at the intersection of the two positioning surfaces. The end of the blade 4 extends into the interior of the clearance groove 1032. The clearance groove 1032 is provided to facilitate the machining of the positioning groove 1031 itself, and also to provide the clearance space required for the installation of the cutter 4.

[0042] In a preferred embodiment where the cutter 4 is mounted on the blade holder disk 102, the cutter 4 is fixedly mounted on the blade holder disk 102 by means of a clamping block 2 and a locking screw 3. The adjacent sides of the clamping block 2 are respectively fitted with the positioning surface in the positioning groove 1031, and the end extends into the interior of the clearance groove 1032.

[0043] Generally speaking, the thickness of the cutter 4 is usually thinner, and the depth of the positioning groove 1031 is greater than the thickness of the cutter 4, so that the two sides of the clamping block 2 are respectively attached to the positioning surface of the positioning groove 1031, and the edge between the two sides extends into the clearance groove 1032.

[0044] Specifically, the clamping block 2, the cutter 4, and the blade holder 102 are all provided with corresponding connecting holes, so that the locking screw 3 passes through the corresponding connecting holes in the clamping block 2, the cutter 4, and the blade holder 102 in sequence to lock and position the cutter 4 on the blade holder 102.

[0045] refer to Figure 4 As shown, the cutter 4 is a rectangular thin sheet structure, and its long side is provided with a blade 401; the cutter 4 has symmetrical oblique cuts 402 at two opposite vertices.

[0046] Generally, the two long sides of the cutter 4 are machined with cutting edges 401. Correspondingly, the cutter 4 has two symmetrically distributed mounting holes for double-sided mounting. The two opposite vertices of the cutter 4 have symmetrical bevels 402, facilitating the arrangement of more cutters 4 on a single tool holder 102. Generally, the cutting edge segment near the center of the tool holder 102 on one side of the cutting edge 401 does not participate in cutting. The effective cutting length of the single-sided cutting edge 401 extends from the cutting edge segment away from the center of the tool holder 102, and the cutting edge segment effectively involved in cutting typically accounts for approximately half of the length of its single-sided cutting edge.

[0047] As an extension, the number N of cutters 4 can be 5, 6, 7 or 8.

[0048] In some embodiments, the number of cutters 4, N ≥ 7, is such that when a single cutter 4 moves to its cutting endpoint, the blade is approximately horizontal. (Refer to 3.) Figure 4 As shown, at this time, the number of cutters 4 is 7. When the cutter 4 moves to its cutting endpoint, the blade above it is in an approximately horizontal state.

[0049] In other embodiments, reference is made to... Figure 5 As shown, the tool holder support 5 has an opening slot. The end of the connecting shaft 101 away from the tool holder disk 102 is rotatably mounted in the opening slot of the tool holder support 5 by an adjusting screw 6. The position of the adjusting screw 6 relative to the tool holder support 5 is locked by a fastening screw. The adjusting screw 6 is preferably an internal hexagon screw.

[0050] As a further preferred embodiment of any of the above embodiments, refer to Figure 8 , Figure 9 As shown, both sides of the tool holder disk 102 are provided with connecting shafts 101, and the connecting shafts 101 are provided with slots 104 located on both sides of the tool holder disk 102. The slots 104 are used to install the protective cover 7.

[0051] Specifically, the protective cover 7 has a slot corresponding to the slot 104, and the side facing the film is open. The blade holder 102 and the cutter 4 on it are located in the protective cover 7 for safety protection.

[0052] refer to Figure 5 As described above, the end of the connecting shaft 101 connected to the tool holder support 5 extends outside the protective cover 7. Therefore, during tool changing, the connecting shaft 101 can be rotated without disassembling the protective cover 7.

[0053] The blade changing device does not affect the continuous cutting of the film during the blade changing process, and can realize online blade changing. The blade changing process is as follows: S1, loosen the fastening screw between the adjusting screw 6 and the blade holder support 5; S2, rotate the adjusting screw 6 to drive the connecting shaft 101 and the cutter 4 on it to rotate to the appropriate position; S3, tighten the fastening screw.

[0054] When the wear of the cutter 4 on the protective cover 7 reaches the set value, remove the protective cover 7 and replace the worn cutter 4 on the cutter holder disk 102.

[0055] This embodiment also provides a diaphragm slitting machine, which includes an unwinding mechanism, a slitting mechanism, and a rewinding mechanism. The slitting mechanism includes an upper blade assembly, a lower blade assembly, and a cutting blade rotation mechanism for driving the upper and lower blade assemblies to rotate. The upper blade assembly includes a blade shaft and a plurality of blade holders spaced apart outside the blade shaft. The blade holders are provided with N cutting blades spaced apart along the circumferential direction, where N≥3. The cutting blade rotation mechanism drives the N cutting blades to rotate and enter the film cutting area in sequence. The cutting angle of a single cutting blade is θ1, and the angle between a single cutting blade and the next cutting blade entering the film cutting area is θ2, where θ1>θ2, so that at least one cutting blade cuts the film during the rotation of the blade holder with the blade shaft.

[0056] Based on the constraint of θ1>θ2, the continuity of film cutting can be effectively guaranteed. This design is applied to a diaphragm slitting machine, thereby achieving a certain degree of continuity of film cutting during blade changes during the slitting process.

[0057] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A continuous film cutting device, characterized in that, It includes a tool holder (1) and a tool holder support (5), wherein the tool holder (1) is rotatably mounted on the tool holder support (5), wherein: The blade holder (1) is provided with N cutting blades (4) spaced apart along the circumference, where N≥3. The blade holder (1) rotates and drives the N cutting blades (4) to enter the film cutting area in sequence. The cutting angle of a single cutter (4) is θ1, and the angle between a single cutter (4) and the next cutter (4) that enters the film cutting area is θ2, θ1 > θ2, so that during the rotation of the cutter holder (1) relative to the cutter holder support (5), at least one cutter (4) cuts the film.

2. The continuous film cutting device according to claim 1, characterized in that, The tool holder (1) includes a fixedly connected tool holder disk (102) and a connecting shaft (101), with the connecting shaft (101) rotatably mounted on the tool holder support (5); N cutting blades (4) are evenly distributed on the tool holder disk (102).

3. The continuous film cutting device according to claim 2, characterized in that, The blade holder (102) has a blade positioning seat (103) on one side. The blade positioning seat (103) has N positioning grooves (105) corresponding to N blades (4) for positioning the blades (4) relative to the blade holder (102).

4. The continuous film cutting device according to claim 3, characterized in that, The positioning groove (1031) includes two positioning surfaces arranged at right angles, and a clearance groove (1032) is provided at the intersection of the two positioning surfaces. The end of the blade (4) extends into the interior of the clearance groove (1032).

5. The continuous film cutting device according to claim 4, characterized in that, The cutter (4) is fixedly installed on the cutter holder (102) by the clamping block (2) and the locking screw (3); the adjacent sides of the clamping block (2) are respectively attached to the positioning surface in the positioning groove (1031), and the end extends into the interior of the clearance groove (1032).

6. The continuous film cutting apparatus according to any one of claims 1-5, characterized in that, The cutter (4) is a rectangular thin sheet structure, and its long side is provided with a blade (401); the two opposite vertices of the cutter (4) are provided with symmetrical oblique cuts (402).

7. The continuous film cutting apparatus according to claim 6, characterized in that, The number of cutters (4) is N≥7. When a single cutter (4) moves to its cutting endpoint, the blade is in an approximately horizontal state.

8. The continuous film cutting apparatus according to any one of claims 2-5, characterized in that, The tool holder support (5) has an opening slot. The end of the connecting shaft (101) away from the tool holder disk (102) is rotatably installed in the opening slot of the tool holder support (5) by adjusting screw (6). The position of adjusting screw (6) relative to the tool holder support (5) is locked by fastening screw.

9. The continuous film cutting apparatus according to claim 8, characterized in that, The tool holder disk (102) is provided with connecting shafts (101) on both sides. The connecting shafts (101) are provided with slots (104) located on both sides of the tool holder disk (102). The slots (104) are used to install protective covers (7).

10. A diaphragm slitting machine, characterized in that, The slitting machine includes an unwinding mechanism, a slitting mechanism, and a rewinding mechanism. The slitting mechanism includes an upper blade assembly, a lower blade assembly, and a cutting blade rotation mechanism for driving the upper blade assembly and the lower blade assembly to rotate. The upper blade assembly includes a blade shaft and a plurality of blade holders spaced apart and sleeved outside the blade shaft. The blade holder is provided with N cutting blades spaced apart along the circumference, where N≥3. The cutting blade rotation mechanism drives the N cutting blades to rotate and enter the film cutting area in sequence. The cutting angle of a single cutter is θ1, and the angle between a single cutter and the next cutter entering the film cutting area is θ2, where θ1 > θ2, so that at least one cutter cuts the film as the cutter holder rotates with the cutter shaft.

Images