Cutting device for lithium ion battery production

Abstract

The invention relates to the technical field of lithium battery production cutting, and discloses a lithium ion battery production cutting device which comprises a splitting machine, a cutter shaft connected to the splitting machine and a plurality of circular cutters connected to the cutter shaft, and two supports are fixedly connected to the top of a splitting machine body. According to the device, a U-shaped frame and a laser sensor are arranged on the outer side of each circular knife, circumferential notch detection can be carried out on the cutting edge of the circular knife through rotation of the circular knife, the detected notch can be marked through cooperation of a mark box, a mark plate and a second electric push rod, and accurate repair after disassembly is facilitated; and through mutual cooperation of the fixed shell, the telescopic shell, the movable shell and the liquid storage tank, under cooperation of the first pipeline and the second pipeline, marking liquid can be supplemented at any time, and insufficiency of the marking liquid is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production and cutting, and specifically provides a cutting device for lithium ion battery production. Background Art

[0002] Cutting in lithium ion battery production is a key process in the lithium battery manufacturing process. In order to continuously longitudinally cut the wide electrode material (positive or negative electrode) after coating and rolling into multiple narrow strip electrode sheets to meet the size requirements of subsequent winding or laminating, a slitter is used.

[0003] For example, the patent with the patent announcement number CN207494664U discloses a lithium battery electrode sheet slitting device, belonging to the technical field of slitter devices. The utility model includes a tool holder, on which a transmission shaft is provided. The transmission shaft is divided into an upper main shaft and a lower main shaft. A number of hydraulic locking tool seats are respectively connected to the upper main shaft and the lower main shaft. The hydraulic locking tool seats on the upper main shaft and the hydraulic locking tool seats on the lower main shaft are distributed in a one-to-one correspondence. An annular blade is fixed on the hydraulic locking tool seat.

[0004] Although the above device solves the problem of low production efficiency, it still has the following defects: When the disk cutting knife of the slitter processes the electrode sheet coating containing high-hardness particles (such as lithium cobaltate or silicon-based materials) for a long time, due to the direct contact and collision of these particles with the tool edge, it is easy to cause the gradual accumulation of microscopic notches. In addition, if the density of the electrode sheet coating is too high and the brittleness increases, the impact force generated by the fracture of the particles during the cutting process will further exacerbate the damage to the tool edge. Therefore, it is necessary to regularly check and maintain the tool, and remove the microscopic notches by grinding or replace the severely damaged blade. The current operation method is to disassemble the tool shaft and the tool for separate inspection and evaluation, and then determine the repair or replacement plan. However, this method lacks a direct detection mechanism for the position of the tool notch, resulting in inconvenience and low efficiency. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a cutting device for lithium ion battery production to solve the problems raised in the background art, so that the microscopic notches of the blade can be detected and located before repair.

[0006] To achieve the above object, the present invention provides the following technical solution: A cutting device for lithium-ion battery production, including a slitter, a cutter shaft connected to the slitter, and a plurality of circular knives connected to the cutter shaft. Two brackets are fixedly connected to the top of the slitter body. A connecting rod is fixedly provided between the two brackets. A plurality of U-shaped frames are fixedly connected to the bottom surface of the connecting rod. The two vertical plates of each U-shaped frame are respectively located on both sides of the circular knife. A laser sensor is provided on each U-shaped frame. The transmitting end and the receiving end of the laser sensor are fixedly connected to the two vertical plates of the U-shaped frame respectively. The transmitting end and the receiving end of the laser sensor are located on both sides of the cutting edge of the circular knife. One side of the U-shaped frame is connected to an installation shell. The end of the installation shell close to the circular knife is open. A marking structure is connected inside the installation shell.

[0007] Further, the marking structure includes a marking box. A marking plate is fixedly connected to the outer wall of the marking box. A second electric push rod is fixedly connected to the inner wall of the installation shell. The output end of the second electric push rod is fixedly connected to the marking box. A rotating plate is hinged at the opening of the installation shell. A liquid supply structure for supplying the marking plate is connected inside the installation shell.

[0008] Further, the liquid supply structure includes a liquid storage tank. A first pipeline is fixedly connected to the outer wall of the liquid storage tank. A first one-way valve is connected to the first pipeline. A fixed shell and a movable shell are connected inside the installation shell. A telescopic shell is fixedly connected between the movable shell and the fixed shell. The fixed shell is fixedly connected to the inner wall of the installation shell. The movable shell is slidably connected to the inner wall of the installation shell. A second pipeline is fixedly connected between the outer wall of the movable shell and the marking box. A second one-way valve is connected to the second pipeline. An absorbent block is embedded in the marking box. The absorbent block abuts against the marking plate. The end of the first pipeline passes through the installation shell and is connected to the fixed shell.

[0009] Further, a rotating mechanism for driving the cutter shaft to rotate at a constant speed is connected to the slitter frame. The rotating mechanism includes a rack plate and a gear. A gear is fixedly sleeved on the outer side of one end of the cutter shaft. A moving groove is opened on the slitter frame. A moving plate is slidably connected in the moving groove. A rack plate meshing with the gear is fixedly connected to the outer wall of the moving plate. A first electric push rod is fixedly installed on the outer wall of the slitter. The output end of the first electric push rod is fixedly connected to the bottom surface of the moving plate.

[0010] Further, protective boxes are fixedly connected to the inner walls of the two vertical plates of the U-shaped frame. The outer end of the protective box is open. The protective box is located outside the laser sensor. A protective plate is slidably connected to the outside of the protective box.

[0011] Further, a lifting component for driving the protective plate to lift and open is connected to the slitter frame. The lifting component includes an L-shaped frame slidably connected to the slitter frame. One end of the rack plate is fixedly connected to a follower plate, and the follower plate abuts against the end of the L-shaped frame. The surfaces of the follower plate and the L-shaped frame that abut against each other are both inclined. An inclined frame is fixedly connected to the top surface of the L-shaped frame, and a push plate is fixedly connected to the top of the inclined frame. A U-shaped sliding rod is fixedly connected between the two protective plates on each U-shaped frame, and a push plate fixedly connected to the push plate is fixedly connected to the outer wall of each U-shaped sliding rod.

[0012] Further, a slider is fixedly connected to the outer wall of the L-shaped frame, a spring is fixedly connected to the top surface of the slider, two symmetrically arranged sliding grooves are formed in the slitter frame, the slider is slidably connected in the sliding groove, and the other end of the spring abuts against the inner wall of the sliding groove.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In the slicing device for lithium-ion battery production, by arranging a U-shaped frame and a laser sensor outside each circular knife, and using the rotation of the circular knife, the circumferential notch detection of the blade of the circular knife can be carried out. Through the cooperation of the marking box, the marking plate and the second electric push rod, the detected notch can be marked, which is convenient for precise repair after disassembly; In the slicing device for lithium-ion battery production, through the mutual cooperation of the fixed shell, the telescopic shell, the movable shell and the liquid storage tank, and with the cooperation of the first pipeline and the second pipeline, the marking liquid can be replenished at any time to prevent the shortage of the marking liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the whole of the present invention seen from the left side; Figure 2 It is a three-dimensional structural schematic diagram of the whole of the present invention seen from the right side; Figure 3 It is a three-dimensional structural schematic diagram of the knife shaft, the circular knife and the first electric push rod of the present invention; Figure 4 It is a three-dimensional sectional structural schematic diagram of the connecting rod and the mixing installation shell of the present invention; Figure 5 It is a three-dimensional sectional structural schematic diagram of the installation shell, the marking box and the telescopic shell of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the liquid absorption block and the marking plate of the present invention; Figure 7 It is a three-dimensional structural schematic diagram of the knife shaft, the gear and the rack plate of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the follower plate, the L-shaped frame and the push plate of the present invention; Figure 9For the present invention Figure 1 Schematic diagram of the three-dimensional enlarged structure at position A in the present invention.

[0015] In the figure: 1, slitter; 2, knife shaft; 3, circular knife; 4, support; 5, connecting rod; 6, U-shaped frame; 7, moving groove; 8, gear; 9, first electric push rod; 10, moving plate; 11, rack plate; 12, inclined frame; 13, following moving plate; 14, L-shaped frame; 15, upward pushing plate; 16, U-shaped sliding rod; 17, pushing plate; 18, liquid storage tank; 19, installation shell; 20, protective box; 21, laser sensor; 22, protective plate; 23, first pipeline; 24, first one-way valve; 25, fixed shell; 26, telescopic shell; 27, moving shell; 28, second electric push rod; 29, marking box; 30, liquid absorbing block; 31, marking plate; 32, rotating plate; 33, second pipeline; 34, second one-way valve; 35, slider; 36, spring; 37, sliding groove. Specific embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0017] Please refer to Figures 1 - 9 , a cutting device for lithium-ion battery production, including a slitter 1, a knife shaft 2 connected to the slitter 1, and a plurality of circular knives 3 connected to the knife shaft 2. Two supports 4 are fixedly connected to the top of the body of the slitter 1. A connecting rod 5 is fixedly provided between the two supports 4. The bottom surface of the connecting rod 5 is fixedly connected with a plurality of U-shaped frames 6. The two vertical plates of each U-shaped frame 6 are respectively located on both sides of the circular knife 3. A laser sensor 21 is provided on each U-shaped frame 6. The emitting end and the receiving end of the laser sensor 21 are respectively fixedly connected to the two vertical plates of the U-shaped frame 6. The emitting end and the receiving end of the laser sensor 21 are located on both sides of the cutting edge of the circular knife 3. One side of the U-shaped frame 6 is connected with an installation shell 19. One end of the installation shell 19 close to the circular knife 3 is open, and a marking structure is connected inside the installation shell 19.

[0018] In the cutting device for lithium-ion battery production of the present invention, when the plurality of circular knives 3 of the slitter 1 have been used for a period of time, it is necessary to repair the plurality of circular knives 3 of the slitter 1. At this time, the laser sensor 21 can be started, so that the emitting end and the receiving end of the laser sensor 21 are aligned with the cutting edge of the circular knife 3. Then, the knife shaft 2 is rotated to drive the circular knife 3 to rotate, so that the circular knife 3 rotates slowly. Here, the rotation of the knife shaft 2 does not require starting the drive motor of the knife shaft 2. Since the drive motor does not need to be started, the knife shaft 2 will not be locked, so the knife shaft 2 and the circular knife 3 can be rotated manually.

[0019] It should be noted here that the laser sensor 21 is a mature existing technology, and the laser sensor 21 has high resolution and the ability to recognize tiny targets. Therefore, the laser sensor 21 can achieve microsecond-level response and 0.05% level accuracy, and can detect the notch on the blade of the circular knife 3.

[0020] When the circular knife 3 is rotating, the laser sensor 21 will detect the blade of the circular knife 3. When a notch is detected, the marking structure in the mounting shell 19 will act to mark the position of the notch within a certain range, which is convenient for later workers to perform targeted maintenance.

[0021] As a preferred technical solution of the present invention, the marking structure includes a marking box 29. The outer wall of the marking box 29 is fixedly connected with a marking plate 31. The inner wall of the mounting shell 19 is fixedly connected with a second electric push rod 28. The output end of the second electric push rod 28 is fixedly connected with the marking box 29. A rotating plate 32 is hingedly arranged at the opening of the mounting shell 19, and a liquid supply structure for supplying the marking plate 31 is connected in the mounting shell 19.

[0022] Specifically, when the laser sensor 21 detects a notch, it will immediately drive the second electric push rod 28 to bring out the marking box 29 to slide, so that the marking box 29 slides out of the mounting shell 19, and the marking plate 31 is aligned with the outer wall of the circular knife 3 to contact, so that the position of the notch on the circular knife 3 is marked. In this way, when later maintenance workers repair the circular knife 3, they can directly find the notch and perform targeted maintenance on it.

[0023] It should be noted here that the laser sensor 21 driving the second electric push rod 28 to push out the marking box 29 can be controlled by the slitter 1 or an external controller. This technology is a mature existing technology, so it will not be elaborated in detail here.

[0024] The setting of the rotating plate 32 can protect the marking plate 31 and prevent the liquid on the marking plate 31 from drying up. The rotating plate 32 can be set as a torsion spring rotating shaft, so that it can seal the inside of the mounting shell 19 as much as possible in the vertical state. When the marking box 29 is moved out, the rotating plate 32 can be pushed open, and when the marking box 29 is reset, the rotating plate 32 rotates and resets.

[0025] As a preferred technical solution of the present invention, the liquid supply structure includes a liquid storage tank 18. The outer wall of the liquid storage tank 18 is fixedly connected with a first pipeline 23. A first one-way valve 24 is connected to the first pipeline 23. A fixed shell 25 and a movable shell 27 are connected inside the installation shell 19. A telescopic shell 26 is fixedly connected between the movable shell 27 and the fixed shell 25. The fixed shell 25 is fixedly connected to the inner wall of the installation shell 19, and the movable shell 27 is slidably connected to the inner wall of the installation shell 19. A second pipeline 33 is fixedly connected between the outer wall of the movable shell 27 and the marking box 29. A second one-way valve 34 is connected to the second pipeline 33. A liquid suction block 30 is embedded in the marking box 29. The liquid suction block 30 abuts against the marking plate 31. The end of the first pipeline 23 passes through the installation shell 19 and is connected to the fixed shell 25.

[0026] Specifically, when the marking box 29 is pushed out, it drives the second pipeline 33, the second one-way valve 34 and the movable shell 27 to slide inside the installation shell 19. When the movable shell 27 moves, it drives the telescopic shell 26 to expand. At this time, the fixed shell 25 remains stationary. When the telescopic shell 26 expands, it drives negative pressure liquid suction to suck liquid from the first pipeline 23. The first one-way valve 24 only allows liquid to pass unidirectionally. At this time, the second one-way valve 34 on the second pipeline 33 blocks the second pipeline 33. Therefore, when the telescopic shell 26 expands, the liquid will be sucked into the fixed shell 25 from the first pipeline 23; when the movable shell 27 resets and drives the telescopic shell 26 to be compressed, the first one-way valve 24 blocks the first pipeline 23, so that the liquid is squeezed into the second pipeline 33 and enters the liquid suction block 30. The liquid suction block 30 can be a sponge block or the like. The capillary pipeline in the sponge block is used to fully fill the marking plate 31 with the marking liquid, making the marking liquid on the marking plate 31 more sufficient and the marking effect better.

[0027] As a preferred technical solution of the present invention, a rotating mechanism for driving the knife shaft 2 to rotate at a constant speed is connected to the frame of the slitter 1. The rotating mechanism includes a rack plate 11 and a gear 8. A gear 8 is fixedly sleeved on the outer side of one end of the knife shaft 2. A moving groove 7 is formed on the frame of the slitter 1. A moving plate 10 is slidably connected in the moving groove 7. A rack plate 11 meshing with the gear 8 is fixedly connected to the outer wall of the moving plate 10. A first electric push rod 9 is fixedly installed on the outer wall of the slitter 1. The output end of the first electric push rod 9 is fixedly connected to the bottom surface of the moving plate 10.

[0028] Specifically, in order to enable the tool shaft 2 to rotate at a constant speed when rotating, when the tool shaft 2 needs to rotate, the first electric push rod 9 can be started. When the first electric push rod 9 is started, the laser sensor 21 is synchronously started. The output end of the first electric push rod 9 acts to drive the moving plate 10 to slide in the moving groove 7 and drive the rack plate 11 to slide, so that the rack plate 11 meshes with the gear 8, thereby driving the gear 8 to rotate and driving the tool shaft 2 to rotate. By using the uniform push of the first electric push rod 9, the rack plate 11 moves uniformly. When the first electric push rod 9 moves to a certain position, the rack plate 11 just meshes with the gear 8 to rotate one circle. The gear 8 rotating one circle drives the tool shaft 2 to rotate one circle, so that each circular knife 3 on the tool shaft 2 rotates one circle at a constant speed. Since the transmitting end and the receiving end of the laser sensor 21 are located on both sides of the blade of the circular knife 3 itself, after the circular knife 3 rotates one circle, the fixed laser sensor 21 just detects the notch of the blade of the circular knife 3.

[0029] As a preferred technical solution of the present invention, protective boxes 20 are fixedly connected to the inner walls of the two vertical plates of the U-shaped frame 6. The outer ends of the protective boxes 20 are open. The protective boxes 20 are located outside the laser sensors 21, and protective plates 22 are slidably connected to the outside of the protective boxes 20.

[0030] Specifically, in order to prevent the laser sensor 21 from being polluted by particulate dust of the electrode plate, the laser sensor 21 can be protected by using the protective box 20 and the protective plate 22.

[0031] As a preferred technical solution of the present invention, a lifting assembly for driving the protective plate 22 to lift and open is connected to the frame of the slitter 1. The lifting assembly includes an L-shaped frame 14 slidably connected to the frame of the slitter 1. The end of the rack plate 11 is fixedly connected with a follower plate 13. The follower plate 13 abuts against the end of the L-shaped frame 14. The surfaces of the follower plate 13 and the L-shaped frame 14 in contact are both inclined. An inclined frame 12 is fixedly connected to the top surface of the L-shaped frame 14. An upper push plate 15 is fixedly connected to the top of the inclined frame 12. A U-shaped sliding rod 16 is fixedly connected between the two protective plates 22 on each U-shaped frame 6. A top plate 17 fixedly connected to the top plate 17 is fixedly connected to the outer wall of each U-shaped sliding rod 16.

[0032] Specifically, when the first electric push rod 9 moves to drive the rack plate 11 to move, it will drive the follower plate 13 to drive the L-shaped frame 14 to move. When the L-shaped frame 14 moves, the top hypotenuse thereof will abut against the hypotenuse of the L-shaped frame 14. As the follower plate 13 moves, it will force the L-shaped frame 14 to slide and rise on the side wall of the frame. As the L-shaped frame 14 rises, it will drive the inclined frame 12 to rise, drive the upper push plate 15 to rise, drive a plurality of top plates 17 to rise, and then drive each U-shaped slide rod 16 to rise, and then drive each protection plate 22 to slide and rise in the protection box 20, exposing the transmitting end and the receiving end of the laser sensor 21. Subsequently, the rack plate 11 continues to move, driving the gear 8 to rotate, and the detection of the circular knife 3 can be achieved.

[0033] It should be noted that when the tool shaft 2 rotates normally to drive the circular knife 3 to perform cutting work, the rack plate 11 is not engaged with the gear 8. That is to say, when the tool shaft 2 is working, the gear 8 idles, which does not hinder the rotation of the tool shaft 2 in the working state. When the rack plate 11 moves, it can be directly engaged with the gear 8.

[0034] As a preferred technical solution of the present invention, a slider 35 is fixedly connected to the outer wall of the L-shaped frame 14, a spring 36 is fixedly connected to the top surface of the slider 35, and two symmetrically arranged sliding grooves 37 are formed on the frame of the slitter 1. The slider 35 is slidably connected in the sliding groove 37, and the other end of the spring 36 abuts against the inner wall of the sliding groove 37.

[0035] Specifically, when the end of the L-shaped frame 14 is pushed by the follower plate 13, the L-shaped frame 14 drives the slider 35 to move in the sliding groove 37 and compresses the spring 36. When the rack plate 11 continues to move, the top of the follower plate 13 will move on the lower surface of the L-shaped frame 14. When the rack plate 11 retracts and returns, the follower plate 13 retracts, and under the action of the spring 36, it presses the slider 35, causing the L-shaped frame 14 to fall and reset, and reset under the limitation of the slider 35 and the sliding groove 37. After resetting, it drives the protection plate 22 to descend, facilitating the next use.

[0036] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cutting device for lithium-ion battery production, comprising a slitter (1), a cutter shaft (2) connected to the slitter (1), and a plurality of circular knives (3) connected to the cutter shaft (2), characterized in that, At the top of the body of the slitter (1), two brackets (4) are fixedly connected. A connecting rod (5) is fixedly arranged between the two brackets (4). The bottom surface of the connecting rod (5) is fixedly connected with a plurality of U-shaped frames (6). The two vertical plates of each U-shaped frame (6) are respectively located on both sides of the circular knife (3). A laser sensor (21) is arranged on each U-shaped frame (6). The emitting end and the receiving end of the laser sensor (21) are respectively fixedly connected to the two vertical plates of the U-shaped frame (6). The emitting end and the receiving end of the laser sensor (21) are located on both sides of the blade of the circular knife (3). One side of the U-shaped frame (6) is connected with a mounting shell (19). One end of the mounting shell (19) close to the circular knife (3) is open, and a marking structure is connected inside the mounting shell (19).

2. The cutting device for lithium-ion battery production according to claim 1, characterized in that, The marking structure includes a marking box (29). A marking plate (31) is fixedly connected to the outer wall of the marking box (29). A second electric push rod (28) is fixedly connected to the inner wall of the mounting shell (19). The output end of the second electric push rod (28) is fixedly connected to the marking box (29). A rotating plate (32) is hinged at the opening of the mounting shell (19). A liquid supply structure for supplying the marking plate (31) is connected inside the mounting shell (19).

3. A cutting device for lithium-ion battery production according to claim 2, characterized in that, The liquid supply structure includes a liquid storage tank (18). A first pipeline (23) is fixedly connected to the outer wall of the liquid storage tank (18). A first one-way valve (24) is connected to the first pipeline (23). A fixed shell (25) and a moving shell (27) are connected inside the mounting shell (19). A telescopic shell (26) is fixedly connected between the moving shell (27) and the fixed shell (25). The fixed shell (25) is fixedly connected to the inner wall of the mounting shell (19). The moving shell (27) is slidably connected to the inner wall of the mounting shell (19). A second pipeline (33) is fixedly connected between the outer wall of the moving shell (27) and the marking box (29). A second one-way valve (34) is connected to the second pipeline (33). A liquid absorbing block (30) is embedded in the marking box (29). The liquid absorbing block (30) abuts against the marking plate (31). The end of the first pipeline (23) penetrates through the mounting shell (19) and is connected to the fixed shell (25).

4. A cutting device for lithium-ion battery production according to claim 3, characterized in that, A rotating mechanism for driving the knife shaft (2) to rotate at a constant speed is connected to the frame of the slitter (1). The rotating mechanism includes a rack plate (11) and a gear (8). A gear (8) is fixedly sleeved on the outer side of one end of the knife shaft (2). A moving groove (7) is formed in the frame of the slitter (1). A moving plate (10) is slidably connected in the moving groove (7). A rack plate (11) meshing with the gear (8) is fixedly connected to the outer wall of the moving plate (10). A first electric push rod (9) is fixedly installed on the outer wall of the slitter (1). The output end of the first electric push rod (9) is fixedly connected to the bottom surface of the moving plate (10).

5. The cutting device for lithium-ion battery production according to claim 4, characterized in that, Both inner walls of the two vertical plates of the U-shaped frame (6) are fixedly connected with protective boxes (20). The outer ends of the protective boxes (20) are open. The protective boxes (20) are located outside the laser sensors (21), and a protective plate (22) is slidably connected to the outside of the protective boxes (20).

6. The cutting device for lithium-ion battery production according to claim 5, characterized in that, A lifting assembly for driving the protective plate (22) to lift and open is connected to the frame of the slitter (1). The lifting assembly includes an L-shaped frame (14) slidably connected to the frame of the slitter (1). The end of the rack plate (11) is fixedly connected with a follower plate (13). The follower plate (13) abuts against the end of the L-shaped frame (14). The surfaces of the follower plate (13) and the L-shaped frame (14) in contact are both inclined. An inclined frame (12) is fixedly connected to the top surface of the L-shaped frame (14). The top of the inclined frame (12) is fixedly connected with a push plate (15). A U-shaped sliding rod (16) is fixedly connected between the two protective plates (22) on each U-shaped frame (6). A jacking plate (17) fixedly connected with the jacking plate (17) is fixedly connected to the outer wall of each U-shaped sliding rod (16).

7. The slicing device for lithium-ion battery production according to claim 6, characterized in that, A slider (35) is fixedly connected to the outer wall of the L-shaped frame (14). A spring (36) is fixedly connected to the top surface of the slider (35). Two symmetrically arranged sliding grooves (37) are formed in the frame of the slitter (1). The slider (35) is slidably connected in the sliding grooves (37). The other end of the spring (36) abuts against the inner wall of the sliding groove (37).

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