Rolling-pre-slitting-slitting all-in-one machine
By integrating rolling, pre-slicing and slitting equipment, and using closed-loop control of line-tracking sensors and image acquisition equipment, the problems of low equipment utilization and large plant occupation are solved, and the precise adjustment of the width and position of the pole slitting are achieved, and the production efficiency and consistency are improved.
Patent Information
- Application Number
- CN202421812360.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-07-30
AI Technical Summary
In the existing battery pole production equipment, the rolling pre-slicing equipment is separated from the slicing equipment, resulting in low equipment utilization, large plant area, and difficult to adjust the pre-slicing width accuracy and position offset in real time.
The rolling, pre-slicing and slitting equipment are integrated, and the line-tracing sensor and image acquisition equipment are used for closed-loop control. The cut-out position of the slitting assembly is adjusted through the transverse shift mechanism to realize real-time adjustment of the slitting width accuracy and position of the pole sheet.
The integration of the pole-piece production process is achieved, reducing the equipment operation time and factory area, and improving the accuracy and consistency of the pole-piece slitting width.
Smart Images
Figure CN223117764U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of battery pole piece production, and more specifically, relates to a rolling-pre-slicing-slicing integrated machine. Background Art
[0002] In order to improve the production efficiency of power batteries, usually, multiple electric sheets are produced from one current collector coating. After rolling, pre-slicing, and slicing, several batteries are formed. Rolling is to improve the energy density of battery pole pieces. In addition, to improve the equipment utilization rate, multiple sheets are also rolled at the rolling station. The pre-slicing process is to cut through the uncoated electrode material area of the current collector after passing multiple electrodes through a slicing knife, dividing them into multiple strips, and cutting at the battery pole ear area. Generally, there is a certain margin in the design of battery pole ears. Therefore, the width accuracy and burr requirements for pre-slicing are relatively low. Slicing is to divide the electrode in the coating area into two to form two battery pole pieces, and the width accuracy of slicing the battery pole pieces is relatively high.
[0003] For the pole pieces after normal coating, the width and relative position of the electrodes on the current collector are fixed. However, occasionally for abnormal situations, it is also possible for the electrode position to have a certain deviation. The slicing knife for pre-slicing has multiple knives on one shaft, and the distance between each knife cannot be adjusted in real time. At the same time, the low width accuracy of pre-slicing is also an inherent problem of the equipment. Considering the size of the final finished battery pole pieces, the current mainstream equipment is a rolling-pre-slicing integrated machine. After pre-slicing multiple pole rolls into multiple single-strip pole pieces, through the next slicing process, the single-strip pole pieces with two pole ears are sliced into pole pieces with a single pole ear. In the slicing process, a single unwinding mechanism has a deviation rectification system, which can accurately identify the width of a single pole piece. After slicing, it ensures that the width of each pole piece is the same, thereby improving the consistency of electrical performance. Content of the Utility Model
[0004] The purpose of the utility model is to provide a rolling-pre-slicing-slicing integrated machine, an apparatus applied to battery pole piece production, which can integrate a rolling-pre-slicing device and a slicing device into one, and has a certain applicability to the situation of offset in the coated material area or large width error in pre-slicing.
[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a rolling-pre-slitting-slitting all-in-one machine, comprising a rewinding component, a rolling component and a pre-cutting component arranged in sequence, a plurality of slitting components are respectively arranged on the rear side of the pre-cutting component, a plurality of winding components are respectively arranged on the rear side of each of the slitting components, a tracking sensor is arranged between the pre-cutting component and any of the slitting components, a fixed plate is arranged at the bottom of the slitting component, a transverse movement mechanism is arranged between the fixed plate and the slitting component, the tracking sensor controls the transverse movement mechanism to adjust the incision position of the slitting component by identifying the edge position of the electrode sheet, an image acquisition device is arranged between the slitting component and any of the winding components, the image acquisition device is used to identify the size width of the electrode sheet after slitting and feed back to the tracking sensor.
[0006] In a possible implementation, the rolling assembly includes an upper roller and a lower roller, and a rolling gap is formed between the upper roller and the lower roller, and the rolling gap is used to roll the pole piece output from the unwinding assembly.
[0007] In a possible implementation, the slitting assembly includes a fixed seat, an upper knife shaft and a lower knife shaft, the upper knife shaft and the lower knife shaft are installed horizontally and parallel to the fixed seat and are arranged at intervals from top to bottom, an upper knife blade is provided on the middle periphery of the upper knife shaft, and a lower knife blade is provided on the middle periphery of the lower knife shaft, the cutting edges of the upper knife blade and the lower knife blade are fitted together for slitting pole pieces, and two slitting motors are provided on the outer side of the fixed seat from top to bottom, and the two slitting motors are respectively connected to the upper knife shaft and the lower knife shaft in a transmission manner.
[0008] In a possible implementation, the transverse movement mechanism includes a movable base plate, a linear guide rail and a transverse movement motor, the movable base plate is fixed at the bottom of the fixed seat, the linear guide rail is laterally installed on the upper end surface of the fixed plate, the movable base plate is arranged on the linear guide rail, the transverse movement motor is installed on the upper end surface of the fixed plate and is located on one side of the linear guide rail, and the driving end of the transverse movement motor is connected to the movable base plate for driving the movable base plate to slide along the linear guide rail.
[0009] In a possible implementation, the rolling-pre-slitting-slitting integrated machine also includes a plurality of main rollers, at least two of the main rollers are arranged between the rolling component and the pre-cutting component, at least two of the main rollers are arranged between the pre-cutting component and any one of the slitting components, and at least two of the main rollers are arranged between the slitting component and any one of the winding components.
[0010] In a possible implementation, auxiliary rollers are provided between the pre-cutting assembly and any one of the slitting assemblies. The auxiliary rollers are correspondingly arranged with the line-tracking sensor and are located on the side of the pole piece away from the line-tracking sensor.
[0011] In a possible implementation, the image acquisition device includes a CCD camera and a camera light source. The CCD camera and the camera light source are located on the same side of the pole piece. The camera light source is arranged on the front side of the CCD camera along the transmission direction of the pole piece. The camera light source provides an illumination area for the area on one side of the pole piece, and the image acquisition end of the CCD camera faces the illumination area.
[0012] In a possible implementation, the illumination area is located on the opposite side of the pole piece away from any one of the main rollers.
[0013] In a possible implementation, a deviation rectifying mechanism is further provided between the pre-cutting assembly and any one of the slitting assemblies. The deviation rectifying mechanism is arranged on the front side of the line-tracking sensor along the transmission direction of the pole piece.
[0014] The beneficial effects of a roll pressing-pre-splitting-slitting integrated machine provided by the present utility model are as follows: Compared with the prior art, as the unwinding assembly rotates, the pole piece is continuously released from the unwinding assembly. After passing through the roll pressing assembly, the pole piece is roll pressed into a target thickness by the roll pressing assembly. Then, after passing through the pre-cutting assembly, the pole piece is pre-cut into multiple strips. The multiple pre-cut pole pieces are respectively passed through the line-tracking sensor and then slit by multiple slitting assemblies. The multiple slit pole pieces are collected into a roll by the winding assembly after passing through the image acquisition device. A roll pressing-pre-splitting-slitting integrated machine provided by the present utility model can integrate unwinding, roll pressing, pre-splitting, slitting, and winding into one, saving the winding mechanism of the roll pressing and pre-cutting equipment and the unwinding mechanism of the slitting equipment, canceling the running time of the products in two processes, and at the same time reducing the floor area occupied by the workshop. At the same time, the line-tracking sensor identifies the edge position of the pole piece and adjusts the cutting position of the slitting assembly through the transverse movement mechanism. At the same time, in cooperation with the image acquisition device after slitting to identify whether the size width of the slit pole piece is qualified. When the slitting width is abnormal, the image acquisition device transmits a signal to the line-tracking sensor, and the line-tracking sensor adjusts the position of the line-tracking sensor relative to the pole piece through its own control motor, thereby driving the slitting assembly to adjust the slitting position, so as to realize the closed-loop control of the slitting width of the pole piece. Description of the Drawings
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0016] Figure 1 Schematic diagram of the tape running of a roll pressing - pre - slitting - slitting integrated machine provided by the present utility model;
[0017] Figure 2 Schematic diagram of the tape running after passing through the roll pressing assembly provided by the present utility model;
[0018] Figure 3 Schematic diagram of the structure of the slitting assembly and the fixing plate provided by the present utility model;
[0019] Figure 4 Schematic diagram of the structure of the slitting assembly, the fixing plate and the tracking sensor provided by the present utility model;
[0020] Figure 5 Schematic diagram of the structure of the pre - slit pole piece provided by the present utility model;
[0021] Figure 6 Schematic diagram of the structure of the slit pole piece provided by the present utility model;
[0022] Figure 7 Schematic diagram of the tape running after passing through the roll pressing assembly provided by another embodiment of the present utility model.
[0023] Explanation of the reference numerals:
[0024] 1. Unwinding assembly; 201. Upper roll of the rolling machine; 202. Lower roll of the rolling machine; 3. Pre - cutting assembly; 4. Slitting assembly; 401. Slitting motor; 402. Motor fixing seat; 403. Upper knife shaft; 404. Upper knife blade; 405. Lower knife blade; 406. Lower knife shaft; 407. Knife fixing seat; 408. Bearing; 409. Moving bottom plate; 410. Linear guide rail; 411. Transverse movement motor; 5. Rewinding assembly; 6. Line - tracking sensor; 7. Auxiliary supporting roller; 8. Fixing plate; 9. CCD camera; 10. Camera light source; 11. Deviation rectifying mechanism. Detailed implementation manners
[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0026] In the claims, the description and the above - mentioned accompanying drawings of the present utility model, unless otherwise clearly defined, when using terms such as "first", "second" or "third", etc., are all used to distinguish different objects and are not used to describe a specific order.
[0027] In the claims, description and the above-mentioned drawings of the present utility model, unless otherwise clearly defined, for orientation terms, such as the use of terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", "high", "low", etc. to indicate the orientation or positional relationship are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present utility model.
[0028] Please refer to Figures 1 to 7 , and now a roll pressing - pre - slitting - slitting integrated machine provided by the present utility model will be described. A roll pressing - pre - slitting - slitting integrated machine includes a unwind assembly 1, a roll pressing assembly, and a pre - cutting assembly 3 arranged in sequence. A plurality of slitting assemblies 4 are respectively arranged at the rear side of the pre - cutting assembly 3, and a plurality of winding assemblies 5 are respectively arranged at the rear side of each slitting assembly 4. A line - tracking sensor 6 is arranged between the pre - cutting assembly 3 and any one of the slitting assemblies 4. A fixing plate 8 is arranged at the bottom of the slitting assembly 4, and a transverse movement mechanism is arranged between the fixing plate 8 and the slitting assembly 4. The line - tracking sensor 6 controls the transverse movement mechanism to adjust the cutting position of the slitting assembly 4 by identifying the edge position of the electric sheet. An image acquisition device is arranged between the slitting assembly 4 and any one of the winding assemblies 5, and the image acquisition device is used to identify the size width of the slit pole piece and feedback it to the line - tracking sensor 6.
[0029] For a roll pressing - pre - slitting - slitting integrated machine provided by the present utility model, compared with the prior art, as the unwind assembly 1 rotates, the pole piece is continuously released from the unwind assembly 1. After passing through the roll pressing assembly, the pole piece is rolled into a target thickness by the roll pressing assembly, and then after passing through the pre - cutting assembly 3, the pole piece is pre - slit into multiple strips. The multiple pre - slit pole pieces are respectively slit by a plurality of slitting assemblies 4 after passing through the line - tracking sensor 6, and the multiple slit pole pieces are wound into rolls by the winding assemblies 5 after passing through the image acquisition device. The roll pressing - pre - slitting - slitting integrated machine provided by the present utility model can integrate unwind, roll pressing, pre - slitting, slitting, and winding into one, saving the winding mechanism of the roll pressing and pre - cutting equipment and the unwind mechanism of the slitting equipment, canceling the running time of the products in two processes, and at the same time reducing the floor area occupied by the factory building. At the same time, the line - tracking sensor 6 identifies the edge position of the pole piece and adjusts the cutting position of the slitting assembly 4 through the transverse movement mechanism. At the same time, in cooperation with the image acquisition device after slitting to identify whether the size width of the slit pole piece is qualified, when the slitting width is abnormal, the image acquisition device transmits a signal to the line - tracking sensor 6, and the line - tracking sensor 6 adjusts the position of the line - tracking sensor 6 relative to the pole piece through its own control motor, thereby driving the slitting assembly 4 to adjust the slitting position, so as to realize the closed - loop control of the slitting width of the pole piece.
[0030] See also Figure 1 The rolling assembly includes an upper roller 201 and a lower roller 202, and a rolling gap is formed between the upper roller 201 and the lower roller 202, and the rolling gap is used to roll the pole piece output from the unwinding assembly 1. The relative position of the upper roller 201 and the lower roller 202 is adjustable, so as to achieve the purpose of adjusting the rolling gap, and can meet the rolling requirements of pole pieces with different thicknesses.
[0031] See also Figure 3 The slitting assembly 4 includes a fixed seat, an upper knife shaft 403 and a lower knife shaft 406, wherein the fixed seat includes a motor fixed seat 402 and a cutter fixed seat 407, the upper knife shaft 403 and the lower knife shaft 406 are installed on the cutter fixed seat 407 in parallel, and the two ends of the upper knife shaft 403 and the lower knife shaft 406 are rotatably installed on the cutter fixed seat 407 through bearings 408 respectively, the upper knife shaft 403 and the lower knife shaft 406 are arranged at intervals from top to bottom, the middle periphery of the upper knife shaft 403 is provided with an upper knife blade 404, the middle periphery of the lower knife shaft 406 is provided with a lower knife blade 405, the upper knife blade 404 and the lower knife blade The blades of 405 fit together for cutting pole pieces, the motor fixing seat 402 is located on one side of the cutter fixing seat 407, and two cutting motors 401 are arranged from top to bottom on the outer side of the motor fixing seat 402 away from the cutter fixing seat 407, and the positions of the two cutting motors 401 correspond to the axial direction of the upper knife shaft 403 and the axial direction of the lower knife shaft 406 respectively, and the two cutting motors 401 are respectively connected to the upper knife shaft 403 and the lower knife shaft 406, thereby driving the upper knife blade 404 and the lower knife blade 405 to rotate through the upper knife shaft 403 and the lower knife shaft 406 to cut the pole pieces passing through the upper knife shaft 403 and the lower knife shaft 406.
[0032] Among them, the upper knife blade 404 and the lower knife blade 405 can be a hardware knife or an electronic knife. The electronic knife can be adjusted manually or by a motor. The matching electronic knife can perform parameterized control of the pre-cutting and cutting blades.
[0033] See also Figure 3, the transverse movement mechanism includes a moving bottom plate 409, linear guide rails 410, and a transverse movement motor 411. The motor fixing seat 402 and the cutter fixing seat 407 are both fixedly installed on the upper end surface of the moving bottom plate 409. The linear guide rails 410 are horizontally installed on the upper end surface of the fixing plate 8. A plurality of sliders are provided on the lower end surface of the moving bottom plate 409, and the moving bottom plate 409 is slidably installed on the linear guide rails 410 by means of the plurality of sliders. The transverse movement motor 411 is also installed on the upper end surface of the fixing plate 8. The transverse movement motor 411 is located on one side in the length direction of the linear guide rails 410. The driving end of the transverse movement motor 411 is horizontally connected to the moving bottom plate 409. The transverse movement motor 411 is used to drive the moving bottom plate 409 to slide along the linear guide rails 410, so as to realize the adjustment of the positions of the upper cutter blade 404 and the lower cutter blade 405 relative to the pole piece.
[0034] In addition, please refer to Figure 1 and Figure 2 , the rolling-pre-slicing-slicing integrated machine further includes a plurality of main supporting rollers. At least two main supporting rollers are arranged between the rolling component and the pre-cutting component 3, at least two main supporting rollers are arranged between the pre-cutting component 3 and any slicing component 4, and at least two main supporting rollers are arranged between the slicing component 4 and any winding component 5. The plurality of main supporting rollers can support the pole piece passing through each process, so that the pole piece is kept in a straightened state, and at the same time, the situation that the pole piece sags due to too long a transmission path is avoided.
[0035] In addition, auxiliary supporting rollers 7 are arranged between the pre-cutting component 3 and any slicing component 4. The auxiliary supporting rollers 7 are arranged corresponding to the line-tracing sensor 6 and are located on the side of the pole piece away from the line-tracing sensor 6. The auxiliary supporting rollers 7 support the pole piece, so that the pole piece in the relative area of the line-tracing sensor 6 is kept in an exhibition state, ensuring the accuracy of the detection result of the pole piece.
[0036] Please refer to Figure 2 , the image acquisition device includes a CCD camera 9 and a camera light source 10. The CCD camera 9 and the camera light source 10 are located on the same side of the pole piece. The camera light source 10 is arranged on the front side of the CCD camera 9 along the transmission direction of the pole piece. The camera light source 10 provides an illumination area for the area on one side of the pole piece. The image acquisition end of the CCD camera 9 faces the illumination area. The camera light source 10 can ensure the clarity of the image signal of the pole piece acquired by the CCD camera 9. A CCD (Charge Coupled Device) camera is also called a CCD image sensor, which converts image pixels into digital signals. There are many neatly arranged capacitors on the CCD, which can sense light and convert the image into a digital signal. Under the control of an external circuit, each small capacitor can transfer the charge it carries to its adjacent capacitor.
[0037] Preferably, the illumination area is located on the opposite side of the pole piece away from any main supporting roller. The main supporting roller can make the pole piece in the illumination area in a flattened state, ensuring the accuracy of the image acquisition by the CCD camera 9.
[0038] Please refer to Figure 7 , as another embodiment, a deviation rectifying mechanism 11 is further provided between the pre-cutting assembly 3 and any slitting assembly 4. The deviation rectifying mechanism 11 is arranged on the front side of the line-tracing sensor 6 along the transmission direction of the pole piece. At this time, the transverse movement mechanism may not be provided, and the slitting assembly 4 is in a fixed form, and the position adjustment of the single pole piece after pre-slitting can also be realized. Cooperating with the CCD camera 9 and the line-tracing sensor 6, the closed-loop control of the slitting width of the pole piece is realized.
[0039] Specifically, please refer to Figure 5 , it is defined that the number of slitting assemblies 4 is two, and the number of winding assemblies 5 is four. After passing through the pre-cutting assembly 3, the pole piece is pre-slit into four strips, namely A / B, C / D, E / F, and G / H. In order to avoid the burrs of the cut edges exceeding the standard due to mutual friction during operation, the four pole pieces after pre-slitting need to stagger and move, that is, one of A / B and one of E / F move in one direction, and the other one of C / D and one of G / H move in the other direction. Before slitting after pre-slitting, there will be two pole pieces on the same main idler roller.
[0040] Please refer to Figure 6 , for the battery pole piece after slitting, also in order to avoid the burrs of the cut edges exceeding the standard due to mutual friction during operation, the four pole pieces after slitting need to stagger and move, that is, A and E move in one direction and are finally wound by one winding assembly 5; in addition, B and E move in the other direction and are finally wound by another winding assembly 5.
[0041] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A roll pressing - pre - slitting - slitting integrated machine, characterized in that, The invention comprises an unwinding component (1), a rolling component and a pre-cutting component (3) which are arranged in sequence, a plurality of slitting components (4) are arranged on the rear side of the pre-cutting component (3), a plurality of winding components (5) are arranged on the rear side of each slitting component (4), a tracking sensor (6) is arranged between the pre-cutting component (3) and any of the slitting components (4), a fixing plate (8) is arranged at the bottom of the slitting component (4), a transverse movement mechanism is arranged between the fixing plate (8) and the slitting component (4), the tracking sensor (6) controls the transverse movement mechanism to adjust the incision position of the slitting component (4) by identifying the edge position of the electrode sheet, and an image acquisition device is arranged between the slitting component (4) and any of the winding components (5), the image acquisition device is used to identify the size width of the electrode sheet after slitting and feed back to the tracking sensor (6).
2. The roll pressing - pre - slitting - slitting integrated machine according to claim 1, wherein, The rolling assembly comprises an upper roller (201) and a lower roller (202) of the rolling machine, wherein a rolling gap is formed between the upper roller (201) and the lower roller (202) of the rolling machine, and the rolling gap is used for rolling the pole piece output from the unwinding assembly (1).
3. The roll pressing-pre-shearing-slitting integrated machine according to claim 1, wherein, The slitting assembly (4) comprises a fixed seat, an upper knife shaft (403) and a lower knife shaft (406); the upper knife shaft (403) and the lower knife shaft (406) are installed in parallel on the fixed seat and are arranged at intervals from top to bottom; an upper knife blade (404) is arranged on the middle periphery of the upper knife shaft (403); a lower knife blade (405) is arranged on the middle periphery of the lower knife shaft (406); the blades of the upper knife blade (404) and the lower knife blade (405) are fitted together for slitting the electrode sheets; two slitting motors (401) are arranged on the outer side of the fixed seat from top to bottom; the two slitting motors (401) are respectively connected to the upper knife shaft (403) and the lower knife shaft (406) in a transmission manner.
4. The roll pressing - pre - slitting - slitting integrated machine according to claim 3, wherein, The transverse movement mechanism includes a movable base plate (409), a linear guide rail (410) and a transverse movement motor (411); the movable base plate (409) is fixed at the bottom of the fixed seat; the linear guide rail (410) is transversely installed on the upper end surface of the fixed plate (8); the movable base plate (409) is arranged on the linear guide rail (410); the transverse movement motor (411) is installed on the upper end surface of the fixed plate (8) and is located on one side of the linear guide rail (410); the driving end of the transverse movement motor (411) is connected to the movable base plate (409) for driving the movable base plate (409) to slide along the linear guide rail (410).
5. A roll pressing - pre - slitting - slitting integrated machine according to claim 1, characterized in that, The rolling-pre-slitting-slitting integrated machine also includes a plurality of main rollers, at least two of the main rollers are arranged between the rolling component and the pre-cutting component (3), at least two of the main rollers are arranged between the pre-cutting component (3) and any one of the slitting components (4), and at least two of the main rollers are arranged between the slitting component (4) and any one of the winding components (5).
6. The roll pressing-pre-shearing-shearing integrated machine according to claim 5, wherein An auxiliary idler (7) is arranged between the pre-cutting assembly (3) and any one of the slitting assemblies (4), and the auxiliary idler (7) is arranged corresponding to the line-tracing sensor (6) and is located on the side of the pole piece away from the line-tracing sensor (6).
7. The roll pressing-pre-shearing-slitting integrated machine according to claim 5, wherein The image acquisition device includes a CCD camera (9) and a camera light source (10). The CCD camera (9) and the camera light source (10) are located on the same side of the pole piece. The camera light source (10) is arranged on the front side of the CCD camera (9) along the transmission direction of the pole piece. The camera light source (10) provides an illumination area for the area on one side of the pole piece, and the image acquisition end of the CCD camera (9) faces the illumination area.
8. The roll pressing-pre-shearing-shearing integrated machine according to claim 7, wherein, The illumination area is located on the opposite side of the pole piece away from any one of the main idlers.
9. A roll pressing - pre - slitting - slitting integrated machine according to any one of claims 1 - 8, characterized in that, A deviation rectifying mechanism (11) is further arranged between the pre-cutting assembly (3) and any one of the slitting assemblies (4), and the deviation rectifying mechanism (11) is arranged on the front side of the line-tracing sensor (6) along the transmission direction of the pole piece.