Slitting lower cutter structure and slitting equipment

Abstract

The embodiment of the invention provides a slitting lower cutter structure and slitting equipment, and relates to the technical field of mechanical equipment. The lower cutter assembly comprises a lower cutter shaft and at least two lower blades arranged on the lower cutter shaft, and the at least two lower blades are sequentially arranged in the axial direction of the lower cutter shaft; the driving assembly is arranged on the supporting base and is configured to drive the lower cutter shaft to move in the axial direction of the lower cutter shaft so as to adjust the position of the lower blade, and therefore when the lower blade in the slitting position is abraded, the lower cutter shaft does not need to be detached, the lower cutter shaft is directly moved to switch a new lower blade, and the cutter adjusting time is greatly shortened.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical equipment, and in particular to a slitting lower knife structure and slitting equipment. Background Art

[0002] The slitting equipment is mainly used to slit sheet materials to achieve the required size. During slitting, the lower blade is very easy to wear. In order to ensure the slitting effect, the lower blade needs to be replaced regularly or when the lower blade is worn.

[0003] At present, the integral lower cutter shaft generally fixes the lower blade at the cutting position of the lower cutter shaft through a spacer. Once the lower blade is worn, the entire lower cutter shaft needs to be disassembled and the spacer removed before the lower blade can be replaced, which takes a long time to replace the blade. Summary of the invention

[0004] The embodiments of the present application provide a slitting lower blade structure and a slitting device, which are used to solve the problem that the replacement of the lower blade of the existing slitting device takes a long time.

[0005] In a first aspect, an embodiment of the present application provides a slitting lower knife structure, comprising:

[0006] Support seat;

[0007] A lower knife assembly comprises a lower knife shaft and at least two lower blades arranged on the lower knife shaft, wherein the at least two lower blades are arranged in sequence along the axial direction of the lower knife shaft;

[0008] The driving assembly is disposed on the supporting seat, and the driving assembly is configured to drive the lower cutter shaft to move along the axial direction of the lower cutter shaft to adjust the position of the lower cutter.

[0009] In a possible implementation manner, the lower knife assembly further includes:

[0010] A lower knife seat, both ends of the lower knife shaft are rotatably connected to the lower knife seat, and the driving assembly is configured to drive the lower knife seat to move along the axial direction of the lower knife shaft to move the lower knife shaft;

[0011] A limit assembly is configured to limit the position of the lower knife seat in a direction perpendicular to the axial direction of the lower knife shaft when the lower knife seat is driven to move by the driving assembly.

[0012] In a possible implementation, the limiting component includes:

[0013] A first limiting member, located at one side of the lower knife seat;

[0014] A second limiting member, located at a side of the lower knife seat away from the first limiting member;

[0015] a first driving member, disposed on the first limiting member and connected to the lower knife seat, wherein the first driving member is configured to apply pressure to the lower knife seat so that the lower knife seat maintains contact with the second limiting member;

[0016] Wherein, the first limiting member and the second limiting member are used to be connected to a frame on which the slitting lower knife structure is installed, or to be connected to the support seat.

[0017] In a possible embodiment, the lower knife assembly also includes a base plate, which is located on the side of the lower knife seat away from the lower knife shaft and is connected to the lower knife seat, and at least one slider is provided on the base plate, and the slider is slidably connected to the support seat, and the driving assembly is connected to the slider, and the driving assembly is configured to drive the slider to move so as to drive the lower knife shaft to move.

[0018] In a possible implementation manner, a slide rail is provided on the support seat, the slide rail extends along the axial direction of the lower cutter shaft, and the sliding block is slidably connected to the slide rail.

[0019] In a possible implementation, the driving assembly is a linear motor, the stator of the linear motor is disposed on the support seat, and the mover of the linear motor is disposed on the slider.

[0020] In a possible implementation manner, at least three partitions are disposed on the lower blade shaft, and at least two lower blades are disposed between two adjacent partitions.

[0021] In a possible implementation, a dust removal assembly is further included, and the dust removal assembly is located on one side of the lower blade of the lower knife shaft for slitting.

[0022] In a possible implementation manner, fixing members are provided at both ends of the support seat, and the fixing members are used to be connected to a frame on which the slitting lower knife structure is installed.

[0023] In a possible implementation manner, an adjusting member is provided on the fixing member, and the adjusting member is configured to adjust the position of the fixing member so that the position of the fixing member is matched with the rack.

[0024] In a second aspect, an embodiment of the present application provides a slitting device, comprising an upper slitting knife structure and a lower slitting knife structure as described in any one of the first aspects, wherein the lower slitting knife structure cooperates with the upper slitting knife structure to perform slitting.

[0025] In the slitting lower knife structure and slitting equipment provided in the embodiments of the present application, the slitting lower knife structure is provided with a support seat, a lower knife assembly and a driving assembly. The lower knife assembly includes a lower knife shaft and at least two lower blades. The lower blades are arranged on the lower knife shaft in sequence along the axial direction of the lower knife shaft, and the driving assembly is provided on the support seat and can drive the lower knife shaft to move relative to the support seat. Specifically, when the lower blade in the slitting position for slitting is worn, the lower knife shaft can be driven by the driving assembly to move a certain distance along the axial direction of the lower knife shaft, and another intact lower blade can be moved to the slitting position to replace the original worn lower blade for slitting. Compared with the existing integral lower knife shaft, the present application directly arranges at least two lower blades on the lower knife shaft for alternating use, which can avoid frequent disassembly of the lower knife shaft to replace the lower blade without causing jumping, thereby effectively shortening the time for replacing the lower blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] Figure 1 A three-dimensional diagram of the slitting lower knife structure provided in this application;

[0028] Figure 2 for Figure 1 A front view of the slitting lower knife structure;

[0029] Figure 3 for Figure 1 A rear view of the slitting lower knife structure;

[0030] Figure 4 A three-dimensional diagram of the slitting lower knife structure provided in an embodiment of the present application after the second limiting member is removed;

[0031] Figure 5 for Figure 4 A front view of the slitting lower knife structure.

[0032] Reference numerals:

[0033] 100-support seat; 110-fixing member; 120-adjusting member;

[0034] 200-lower knife assembly; 210-lower knife shaft; 220-lower blade; 230-lower knife seat; 240-bottom plate; 250-limiting assembly; 251-first driving member; 252-first limiting member; 253-second limiting member; 260-sliding block; 270-connecting plate; 280-slide rail;

[0035] 300- driving assembly;

[0036] 400-dust removal assembly;

[0037] 500-divider.

[0038] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0040] The slitting equipment is mainly used for slitting sheet materials, such as battery tabs, paper sheets, films, etc. It generally includes an upper knife shaft and a lower knife shaft. The upper knife shaft is provided with a lower blade, and the lower knife shaft is provided with a lower blade. The upper blade and the lower blade cooperate to perform slitting.

[0041] Among them, during slitting, the lower blade is very easy to wear. In order to ensure the slitting effect, the lower blade needs to be replaced regularly or when the lower blade is worn.

[0042] There are currently two common types of lower blade shafts. One is the air expansion shaft type, which uses the air expansion shaft as the lower blade shaft. The lower blade spacer is mounted on the air expansion shaft to separate and position the lower blade. When replacing or moving the lower blade, the air expansion shaft shrinks and the lower blade spacer can be moved to replace the lower blade. After replacement, the air expansion shaft is tightened to fix the lower blade.

[0043] In actual application of this method, the overall axial and radial runout of the lower knife spacer is large, and some parts can be as high as more than 10um. The repeatability positioning accuracy of the lower knife spacer is also quite different, and can be as high as more than 5um, which will reduce the overall slitting effect and is not conducive to materials with high precision requirements, such as slitting battery electrodes.

[0044] The other is the electrode cutting lower blade shaft which is more commonly used in the lithium battery industry. The lower blade shaft is an integral lower blade shaft. A lower blade is arranged at the cutting position and the lower blade is positioned by a lower blade spacer. Once the lower blade is worn, it is necessary to remove the lower blade shaft and the lower blade spacer before replacing the blade. The operation is cumbersome, time-consuming and labor-intensive.

[0045] In order to avoid the above-mentioned problems, the embodiments of the present application provide a slitting lower knife structure and a slitting device. A plurality of lower blades are arranged on the lower knife shaft in the slitting lower knife structure. When the lower blade at the slitting position is worn, the lower knife shaft can be moved to move the unworn lower blade to the slitting position to continue slitting without the need to frequently disassemble the lower knife shaft. Only when all the lower blades on the lower knife shaft are worn out, they can be all replaced at one time. Therefore, they can be disassembled once and used continuously for a long time, which effectively reduces the time required for replacing the lower blade. At the same time, there will be no problem of lower blade jumping, which helps to improve the quality of the product after slitting.

[0046] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0047] In some embodiments of this application, see Figure 1 , Figure 2 and Figure 3 As shown, the slitting lower knife structure includes a support seat 100, a lower knife assembly 200 and a driving assembly 300.

[0048] The support seat 100 is used to connect with a device such as a frame for installing a slitting lower knife structure. The driving assembly 300 is arranged on the support seat 100. The lower knife assembly 200 includes a lower knife shaft 210. At least two lower blades 220 are arranged on the lower knife shaft 210, and the lower blades 220 are arranged in sequence and spaced apart along the extension direction of the lower knife shaft 210.

[0049] The number and interval of the lower blades 220 can be determined according to actual conditions.

[0050] Exemplarily, 20 lower blades 220 can be set corresponding to each slitting position, and the spacing between adjacent lower blades 220 is 5 mm. Each time the lower blade 220 in the slitting position needs to be switched for slitting, the lower blade shaft 210 can be directly pushed 5 mm along its axial direction through the driving assembly 300. The 20 lower blades 220 can adapt to the demand of using the slitting lower blade structure for 2 years or even longer, thereby achieving the purpose of not having to disassemble the lower blade shaft 210 for replacing the lower blade 220 for at least 2 years, effectively reducing the blade adjustment time.

[0051] Specifically, during use, if the lower blade 220 in the slitting position is worn and affects slitting, the driving assembly 300 is started to drive the lower blade shaft 210 to move a certain distance relative to the support seat 100 in the axial direction of the lower blade shaft 210, that is, in the X direction, so that the unworn lower blade 220 moves to the slitting position, so that slitting can be carried out normally.

[0052] It is understandable that after the worn lower blade 220 moves, it will be offset from the upper blade on the upper blade shaft of the slitting device, thereby not affecting the normal slitting of materials such as pole pieces.

[0053] In some embodiments of the present application, the lower knife assembly 200 further includes a lower knife seat 230 and a limiting assembly 250 .

[0054] The extension direction of the lower knife seat 230 is the same as the extension direction of the lower knife shaft 210 , and both ends of the lower knife shaft 210 are rotatably connected to the lower knife seat 230 and supported by the lower knife seat 230 .

[0055] Exemplarily, bearing fixing seats can be set at both ends of the lower knife seat 230, and the lower knife shaft 210 is rotatably connected to the bearing fixing seats through bearings, and the lower knife shaft 210 can be connected to a motor or other equipment through a coupling, so as to drive the lower knife shaft 210 to rotate and cooperate with the upper knife shaft of the slitting equipment for slitting.

[0056] The limiting assembly 250 is connected to the lower knife seat 230. When the lower knife seat 230 is driven to move by the driving assembly 300, the limiting assembly 250 can limit the position of the lower knife seat 230 in a direction perpendicular to the axial direction of the lower knife shaft 210, that is, the position of the lower knife seat 230 in the Y direction, to prevent the lower knife seat 230 from shaking when it is driven to move by the driving assembly 300.

[0057] Specifically, the lower knife shaft 210 is installed on the lower knife seat 230. When the driving component 300 drives the lower knife seat 230 to move along the X direction, the lower knife shaft 210 will move synchronously, thereby switching the lower blade 220 in the cutting position to achieve rapid replacement of the worn lower blade 220. During this process, the limit assembly 250 can limit the moving direction of the lower knife seat 230 to prevent the lower knife seat 230 from deflecting in the Y direction.

[0058] For further information, see Figure 1 , Figure 3 and Figure 4 As shown, the limiting assembly 250 includes a first limiting member 252 , a second limiting member 253 and a first driving member 251 .

[0059] The first limit member 252 and the second limit member 253 are respectively located on both sides of the extension direction of the lower knife seat 230, that is, on both sides of the X direction. The first driving member 251 is arranged on the first limit member 252 and is connected to the lower knife seat 230. The first driving member 251 can apply pressure to the lower knife seat 230 to keep the lower knife seat 230 in contact with the second limit member 253, thereby limiting the position of the lower knife seat 230 in the Y direction from both sides by the first driving member 251 and the second limit member 253, thereby preventing the lower knife seat 230 from shaking in the Y direction.

[0060] Among them, the first limit member 252 and the second limit member 253 are both used to connect with the support seat 100, or to connect with a structure such as a frame for installing the slitting lower knife structure. As long as the first limit member 252 and the second limit member 253 can maintain their positions unchanged during use, provide support for the first driving member 251, and limit the position of the lower knife seat 230, this embodiment does not limit it here.

[0061] It is understandable that the first driving member 251 can be a tightening cylinder or other equipment, as long as it can apply appropriate pressing force to push the lower knife seat 230 to maintain contact with the second limiting member 253 and limit the moving direction of the lower knife seat 230.

[0062] In some embodiments of this application, see Figure 1 , Figure 4 and Figure 5 As shown, the lower knife assembly 200 also includes a base plate 240, which is located on the side of the lower knife seat 230 away from the lower knife shaft 210 and is connected to the lower knife seat 230. At least one slider 260 is arranged on the base plate 240, and the slider 260 is slidably connected to the support seat 100. The driving assembly 300 is connected to the slider 260, and the driving assembly 300 can drive the slider 260 to move, so as to drive the lower knife shaft 210 to move.

[0063] Specifically, in the Z direction, the lower knife seat 230, the bottom plate 240 and the slider 260 are arranged in sequence up and down, and the bottom plate 240 can be connected to the slider 260 by the connecting plate 270. When the driving assembly 300 drives the slider 260 to move along the X direction, the bottom plate 240, the lower knife seat 230 located above the bottom plate 240, and the lower knife shaft 210 rotatably connected to the lower knife seat 230 can be driven by the connecting plate 270 to move synchronously along the X direction, thereby switching the lower blade 220 in the cutting position to achieve rapid switching of the lower blade 220.

[0064] Optionally, the first limit member 252 and the second limit member 253 can be set as an inverted L-shaped plate, which includes a horizontal plate and a vertical plate, the horizontal plate is parallel to the X direction, and the vertical plate is parallel to the Y direction. The size of the lower knife seat 230 is smaller than the size of the bottom plate 240. The horizontal plate is placed above the bottom plate 240, and the vertical plate is located on the side of the bottom plate 240. A driving force is applied to the first driving member 251 to push the lower knife seat 230 to move, so that at least one of the lower knife seat 230 and the bottom plate 240 abuts against the second limit member 253, thereby limiting the position of the lower knife shaft 210 in the Y direction.

[0065] Furthermore, balls may be added to the contact surfaces between the second limiting member 253 and the bottom plate 240 and the lower knife seat 230 to achieve rolling contact, so as to limit the position without affecting the movement of the lower knife seat 230 and the bottom plate 240 in the X direction.

[0066] Optionally, a slide rail 280 can be provided on the support seat 100, and the extension direction of the slide rail 280 is the same as the movement direction of the lower knife shaft 210, that is, the slide rail 280 extends along the X direction, and the slider 260 is slidably connected to the slide rail 280, so that when the slider 260 is driven to move by the driving component 300, it only moves along the slide rail 280, thereby guiding the movement of the slider 260 through the slide rail 280.

[0067] Optionally, the slider 260 can be I-shaped, and the structure of the slide rail 280 cooperates with the slider 260. In this way, when the slider 260 moves, the slide rail 280 can also limit the position of the slider 260 in the Z direction to prevent the entire lower knife assembly 200 from jumping on the support seat 100.

[0068] It is understandable that the slide rail 280 and the slider 260 may also be other structures that cooperate to provide guidance, and this embodiment does not limit this.

[0069] In some embodiments of the present application, the driving assembly 300 is a linear motor, the stator of the linear motor is disposed on the support seat 100 , and the mover of the linear motor is disposed on the slider 260 .

[0070] The linear motor is composed of a stator and a mover. The stator is fixed on the support seat 100 and extends along the X direction. When the stator is energized, a moving magnetic field can be generated. This magnetic field interacts with the magnetic field of the mover to generate a driving force, so that the mover can move along the direction of the stator, so that the slider 260 connected to the mover moves with the mover to drive the base plate 240, the lower knife seat 230, and the lower knife shaft 210 to move synchronously, thereby realizing the precise adjustment of the position of the lower knife shaft 210. In terms of positioning accuracy, the repeat positioning accuracy can be as high as 2um. Compared with the traditional replacement of the lower blade 220, the repeat positioning accuracy of manual positioning or motor ball screw positioning is about 5um, which greatly improves the repeat positioning accuracy.

[0071] It is understandable that the driving assembly 300 may also be a combination of a screw and a motor, or other structures that can drive the lower knife shaft 210 to perform linear motion, which is not limited in this embodiment.

[0072] Furthermore, a grating scale closed-loop system can be added to improve the repeatability of positioning accuracy.

[0073] Specifically, the grating ruler is a high-precision position measurement device, usually composed of a series of tight scales that can be read by optical sensors, so that tiny displacement changes can be detected by the grating ruler and the optical sensor. These tiny displacement changes can be continuously monitored and fed back to the controller. The controller adjusts the action of the linear motor according to the difference between the actual position provided by the grating ruler and the target position to automatically compensate for the error, so that the lower knife shaft 210 can be accurately moved to the target position, achieving higher repeatability and positioning accuracy, thereby effectively improving the slitting effect.

[0074] In different usage scenarios, there may be different slitting requirements, and the corresponding slitting position requirements may be different. In this regard, in this embodiment, at least three partitions 500 are arranged on the lower knife shaft 210, and at least two lower blades 220 are arranged between two adjacent partitions 500.

[0075] The lower blade 220 between two adjacent partitions 500 is used for cutting at one cutting position, so that at least two different cutting areas can be formed, corresponding to two different cutting positions for cutting to meet the usage requirements of different scenarios. In the area corresponding to each cutting position, the distance between adjacent lower cutters will not be too large. When switching the lower cutter, the drive assembly 300 will only drive the lower knife shaft 210 to move within a certain range, and will not move too large a distance, which will not affect the normal use of the cutting lower knife structure.

[0076] It is understandable that the specific number and position of the partitions 500 can be adjusted according to actual usage requirements.

[0077] Exemplarily, four dividers 500 are provided to form three cutting areas. The cutting area in the middle is more commonly used and can be provided with 20 lower blades 220, while the cutting areas on both sides are used less frequently and the number of lower cutters provided can be reduced.

[0078] In addition, the separator 500 may be composed of one lower blade spacer or multiple lower blade spacers, as long as the corresponding lower blade 220 can be fixed in the corresponding cutting area and no displacement occurs during use. This embodiment does not limit it.

[0079] During the slitting process, debris may fly out. In order to prevent the debris from flying out, the slitting lower knife structure in this embodiment also includes a dust removal component 400. The dust removal component 400 is located at the slitting position. When the slitting is performed, the debris can be collected by negative pressure adsorption.

[0080] It can be understood that the dust removal component 400 can be a combination of a negative pressure fan, a pipe system, a dust box or a dust bag, etc., and its suction port is opposite to the cutting position. The debris generated by the cutting can be directly collected and sent to the dust box or dust bag through the pipe system for storage for subsequent processing.

[0081] Optionally, the dust removal assembly 400 can be fixed on the second limit member 253, and the lower knife seat 230 is driven by the first driving member 251 to always maintain contact with the second limit member 253, and the lower knife shaft 210 is arranged on the lower knife seat 230. Therefore, the dust removal assembly 400 is arranged on the second limit member 253, so that the distance between the dust removal assembly 400 and the cutting position can be kept unchanged, thereby stably adsorbing the debris.

[0082] Of course, the dust removal assembly 400 can also be fixed on the support seat 100 or on a frame for installing the slitting lower knife structure, as long as the working end of the dust removal assembly 400 does not move with the lower knife shaft 210 but always stays in the slitting position, this embodiment does not limit it here.

[0083] In addition, when there are multiple cutting positions corresponding to the cutting axis, a dust removal component 400 can be set for each cutting position, or only one can be set, but it is slidably connected to the second limiting member 253, and when cutting at different cutting positions, the dust removal component 400 can be moved to the corresponding cutting position.

[0084] In some embodiments of the present application, fixing members 110 are provided at both ends of the support seat 100, and the fixing members 110 are used to connect to the frame on which the slitting lower knife structure is installed.

[0085] Specifically, the fixing member 110 may be provided with mounting holes and other structures, and can be connected to a frame or a wall panel or other structures in an installation room where the cutting lower knife structure is installed through the mounting holes and other structures, so that the support seat 100 can stably support each component during use without shaking.

[0086] The fixing member 110 and the supporting base 100 may be integrally formed or separately provided, which is not limited in this embodiment.

[0087] Furthermore, an adjusting member 120 is provided on the fixing member 110 , and the adjusting member 120 is used to adjust the position of the fixing member 110 so that the position of the fixing member 110 is matched with the rack or the wall panel for connection.

[0088] Exemplarily, the adjusting member 120 can be composed of components such as a base, a support column, a load-bearing platform, a locking device, and a lifting mechanism. The base is used to contact a support platform such as the ground. The support column connects the base and the load-bearing platform. The lifting mechanism is used to drive the support column to extend and retract and adjust the height of the load-bearing platform. The locking device is used to limit the position of the adjusting member 120 after the load-bearing platform is adjusted to a required height, and the bottom of the fixing member 110 is connected to the load-bearing platform. When the lifting mechanism drives the load-bearing platform to move up and down in the Z direction, the fixing member 110 can change its height as the load-bearing platform moves up and down, and simultaneously change the height of the support seat 100, so that the fixing member 110 can be connected to structures such as a frame or wall panel.

[0089] Furthermore, the adjusting member 120 can also be enabled to adjust the position of the support seat 100 in the Y direction. At this time, the adjusting member 120 can be composed of common components such as a screw and a support platform, so that the adjusting member 120 can adjust the position of the fixing member 110 in the Z direction as well as the position of the fixing member 110 in the Y direction.

[0090] An embodiment of the present application also provides a slitting device, including an upper slitting knife structure and the lower slitting knife structure in the above embodiment, the upper slitting knife structure includes an upper blade, the upper blade is located at the slitting position, and cooperates with the lower blade 220 in the slitting position to perform slitting.

[0091] It is understandable that the slitting upper knife structure can adopt a structure in which a conventional upper knife shaft cooperates with an upper blade, which is well known to those skilled in the art and will not be described in detail in this embodiment.

[0092] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A slitting lower knife structure, characterized in that: include: Support seat (100); A lower knife assembly (200) comprises a lower knife shaft (210) and at least two lower blades (220) arranged on the lower knife shaft (210), wherein the at least two lower blades (220) are arranged in sequence along the axial direction of the lower knife shaft (210); The driving assembly (300) is disposed on the supporting seat (100), and the driving assembly (300) is configured to drive the lower blade shaft (210) to move along the axial direction of the lower blade shaft (210) to adjust the position of the lower blade (220).

2. The slitting lower knife structure according to claim 1, characterized in that: The lower knife assembly (200) further comprises: A lower knife seat (230), both ends of the lower knife shaft (210) being rotatably connected to the lower knife seat (230), and the driving assembly (300) being configured to drive the lower knife seat (230) to move along the axial direction of the lower knife shaft (210) so as to move the lower knife shaft (210); A limit assembly (250), wherein the limit assembly (250) is configured to limit the position of the lower knife seat (230) in a direction perpendicular to the axial direction of the lower knife shaft (210) when the lower knife seat (230) is driven to move by the driving assembly (300).

3. The slitting lower knife structure according to claim 2, characterized in that: The limiting component (250) comprises: A first limiting member (252) is located on one side of the lower knife seat (230); A second limiting member (253) is located on a side of the lower knife seat (230) away from the first limiting member (252); A first driving member (251) is disposed on the first limiting member (252) and connected to the lower knife seat (230), wherein the first driving member (251) is configured to apply pressure to the lower knife seat (230) so that the lower knife seat (230) maintains contact with the second limiting member (253); Wherein, the first limiting member (252) and the second limiting member (253) are used to be connected to a frame on which the slitting lower knife structure is installed, or to be connected to the support seat (100).

4. The slitting lower knife structure according to claim 2, characterized in that: The lower knife assembly (200) further comprises a base plate (240), wherein the base plate (240) is located on a side of the lower knife seat (230) facing away from the lower knife shaft (210) and is connected to the lower knife seat (230), a slider (260) is provided on the base plate (240), and the slider (260) is slidably connected to the support seat (100), and the driving assembly (300) is connected to the slider (260), and the driving assembly (300) is configured to drive the slider (260) to move so as to drive the lower knife shaft (210) to move.

5. The slitting lower knife structure according to claim 4, characterized in that: The support seat (100) is provided with a slide rail (280), the slide rail (280) extends along the axial direction of the lower knife shaft (210), and the sliding block (260) is slidably connected to the slide rail (280).

6. The slitting lower knife structure according to claim 4, characterized in that: The driving assembly (300) is a linear motor, the stator of the linear motor is arranged on the support seat (100), and the mover of the linear motor is arranged on the slider (260).

7. The slitting lower knife structure according to any one of claims 1 to 6, characterized in that: At least three partitions (500) are arranged on the lower blade shaft (210), and at least two lower blades (220) are arranged between two adjacent partitions (500).

8. The slitting lower knife structure according to any one of claims 1 to 6, characterized in that: It also includes a dust removal component (400), and the dust removal component (400) is located on one side of the lower blade (220) of the lower blade shaft (210) used for cutting.

9. The slitting lower knife structure according to any one of claims 1 to 6, characterized in that: Both ends of the support seat (100) are provided with fixing members (110), and the fixing members (110) are used to be connected to a frame on which the slitting lower knife structure is installed.

10. The slitting lower knife structure according to claim 9, characterized in that: The fixing member (110) is provided with an adjusting member (120), and the adjusting member (120) is configured to adjust the position of the fixing member (110) so that the position of the fixing member (110) is adapted to the frame.

11. A slitting device, characterized in that: It comprises an upper slitting knife structure and a lower slitting knife structure according to any one of claims 1 to 10, wherein the lower slitting knife structure cooperates with the upper slitting knife structure to perform slitting.

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