Cutting device and slitting machine

Abstract

A cutting device comprises a first shaft rod, a second shaft rod, a knife rest, a blade and a fixing frame. The first shaft rod and the second shaft rod extend in the first direction and are fixed to the fixing frame, and a feeding interval is formed between the first shaft rod and the second shaft rod. The knife rest is fixedly installed on the first shaft rod in a sliding mode in the first direction, the knife rest comprises a fixing plate, a cover plate and a magnetic attraction part, the magnetic attraction part is installed on the fixing plate or the cover plate, the cover plate is fixed to the fixing plate under the magnetic attraction effect, and the cover plate and the fixing plate clamp and fix a blade. A plurality of limiting grooves are formed in the second shaft rod in the first direction, and the blades can be inserted into the corresponding limiting grooves. The blade can be replaced only by overcoming magnetic force and taking down the cover plate, and the operation is simple and rapid.

Description

Technical Field

[0001] This application relates to the field of material slitting technology, specifically to a slitting machine. Background Technology

[0002] A slitting machine is a widely used device that cuts wide rolls of material into narrower rolls. Conventional slitting machines use a ring-shaped blade for cutting, with the upper and lower blades rotating in coordination. However, when cutting thinner films, this method can lead to the ring blade failing to cut the film immediately, causing the film to be squeezed and deformed by the rotating blade, resulting in defective products. Furthermore, this type of slitting machine requires the upper and lower blades to work together, necessitating significant time to adjust the blade spacing.

[0003] To overcome the aforementioned shortcomings, a straight-blade slitting method was designed. During operation, the straight blade does not rotate; the material, under the traction of the slitting machine, comes into perpendicular contact with the blade edge and is slit into narrower widths. This design is particularly effective when slitting thinner films. However, existing straight-blade slitting machines have complex blade holder structures, high production costs, and cumbersome straight blade replacement methods, making operation inconvenient. Summary of the Invention

[0004] The purpose of this application is to overcome the aforementioned defects or problems in the prior art and to provide a cutting device with a simple blade replacement method and low manufacturing cost.

[0005] To achieve the above objectives, the following technical solution is adopted:

[0006] A cutting device for cutting material conveyed along a second direction perpendicular to a first direction includes a first shaft, a second shaft, a tool holder, a blade, and a fixing frame. The first shaft and the second shaft extend along the first direction and are fixedly connected to the fixing frame, forming a gap between them for conveying material along the second direction. The tool holder is slidably mounted on the first shaft along the first direction. The tool holder includes a fixing plate, a cover plate, and a magnetic suction component. The fixing plate has a blade mounting portion at one end away from the first shaft. The magnetic suction component is mounted on the fixing plate or the cover plate and is used to fix the cover plate to the blade mounting portion by magnetic attraction, and to clamp and fix the blade by the cover plate and the fixing plate. The second shaft has a plurality of limiting grooves arranged along the first direction, and the opening of each limiting groove faces the tool holder, so that the blade corresponding to the position of the limiting groove can be inserted into the limiting groove.

[0007] Furthermore, the fixing plate has a first through hole and a screw hole at the end connected to the first shaft. The fixing plate is slidably installed on the first shaft in a first direction through the first through hole, and the screw hole connects the outer wall of the fixing plate with the outer wall of the first through hole.

[0008] Furthermore, the fixing plate includes screws, which fix the fixing plate to the first shaft through the screw holes.

[0009] Furthermore, the blade mounting portion or cover plate is provided with a receiving cavity.

[0010] Furthermore, the magnetic attraction component is a magnet, and the magnet is installed in the accommodating cavity.

[0011] Furthermore, the blade mounting portion is provided with a protruding column.

[0012] Furthermore, the cover plate is provided with a second through hole corresponding to the protruding post, and the blade is provided with a third through hole corresponding to the protruding post.

[0013] Furthermore, the fixing plate and the cover plate are made of steel.

[0014] Furthermore, there are several blade holders and blades.

[0015] In addition, a slitting machine is provided, including the cutting device described in any of the above claims.

[0016] Compared with existing technologies, the above solution has the following beneficial effects:

[0017] A cutting device is used to cut material conveyed along a second direction perpendicular to a first direction. A first shaft and a second shaft both extend along the first direction and are fixed to a frame, forming a gap between them for conveying material along the second direction. Under the traction of the slitting machine, the material passes through the feeding gap between the two shafts. The second shaft is located below, supporting the material; the first shaft is located above, and a blade holder and blades are mounted on the first shaft to cut the material. The blade holder slides along the first shaft in the first direction and is fixed to the first shaft after sliding to the desired position. When the slitting machine is working, it cuts the material into different specifications according to different needs. The sliding of the blade holder along the first shaft in the first direction allows for convenient and quick adjustment of the blade holder and blades to the required position for material cutting.

[0018] The blade holder includes a fixed plate, a cover plate, and a magnetic suction component. In existing technologies, material slitting typically involves upper and lower circular blades shearing against each other or direct slitting with a straight blade. While the upper and lower circular blades shearing method is suitable for cutting thicker, harder materials, blade changes are cumbersome, and when cutting tape, the friction between the blades and the tape's edge causes the blade's angled edge to scrape against the adhesive layer, resulting in poor material edges. Existing straight blades improve the material slitting method, avoiding this scraping issue, but their complex structure, high manufacturing cost, and cumbersome blade changes further complicate the process. In this application, the blade is fixed to the blade holder using a magnetic suction method. The magnetic suction component is mounted on the fixed plate or cover plate, and the cover plate is fixed to the blade mounting part by the magnetic attraction of the component. The blade is located between the cover plate and the blade mounting part; when the cover plate is fixed to the blade mounting part, the cover plate and fixed plate cooperate to clamp and fix the blade. No special tools are needed to change the blades; simply overcome the magnetic force to remove the cover plate. The operation is simple and quick, improving production efficiency. Furthermore, ordinary workers can operate the system with a short training session, eliminating the need for specialized technicians and reducing labor costs.

[0019] The second shaft has multiple limiting grooves along the first direction, with the groove openings facing the blade holder. The blades can be inserted into the corresponding limiting grooves. During slitting, the second shaft supports the material. Without these limiting grooves, the material slides across the surface of the second shaft, and the blades approach the surface to cut the material passing through it. When the material to be cut is very thin, adjusting the blades becomes cumbersome. If the blades are too far from the second shaft, they cannot cut the material or can only cut the upper part. If the blades are too close, they will damage the second shaft, which in turn will damage the first blade, resulting in poor material cutting. With the limiting grooves on the second shaft, the blades can be inserted into the corresponding grooves. During slitting, regardless of the material's thickness, it will be cut by the blades as it passes through the feeding gap formed by the first and second shafts, improving production efficiency. Simultaneously, during cutting, the release of the material's own stress applies a force to the blades in the left-right direction, causing the blades to oscillate in that direction. The distance between two adjacent groove walls along the first direction of the limiting groove is a small dimension. When the blade swings left and right, the swing distance is limited to a small range, which improves the overall stability of operation and increases production efficiency.

[0020] The fixing plate has a first through hole and a screw hole at the end connected to the first shaft. The screw hole penetrates the outer wall of the fixing plate and the outer wall of the first through hole, allowing the first shaft to pass through the first through hole. A through hole is machined at one end of the fixing plate, allowing the fixing plate to slide along the first shaft in a first direction through the first through hole. This design simplifies the manufacturing of the through hole, allows for quick adjustment of the fixing plate's position, minimizes damage to the through hole, and ensures high stability during use, thus reducing production costs and improving work efficiency.

[0021] When the screw passes through the screw hole and is tightened, the screw's entry end is in contact with the first shaft, and the screw's nut end is secured to the outer wall of the fixing plate, thus fixing the fixing plate and the first shaft together. In this design, the fixing components for the fixing plate and the first shaft are simple to manufacture; a single screw can complete the fixation, reducing production costs.

[0022] The blade mounting section or cover plate has a receiving cavity for accommodating the magnetic component. The magnetic component is housed within the receiving cavity, and does not protrude beyond the surface of the cavity. This design ensures that when the cover plate and blade mounting section are fixed, their contact surfaces are both planar, meaning the blade's contact surfaces with both the cover plate and the blade mounting section are flat, rather than being attached to a protruding magnetic component. This increases the contact area between the blade and the cover plate and blade mounting section, increasing the friction between the contact surfaces and making the blade less prone to movement. Simultaneously, the blade not directly contacting the magnetic component also reduces the risk of damage to the magnetic component, improving production efficiency.

[0023] The magnetic component is a magnet, which is installed in the receiving cavity. Under the magnetic attraction of the magnet, the blade is clamped and fixed by the cover plate and the fixing plate. When installing the blade, simply overcome the magnetic force and remove the cover plate to replace the blade. The fixing plate and the cover plate clamp and fix the blade by the magnetic attraction of the magnet, which not only allows the blade to stably cut materials, but also makes the blade replacement simple and quick.

[0024] The blade mounting section features a protruding column. When the cover plate and fixing plate clamp and fix the blade, the cover plate and blade are secured to the protruding column, preventing them from sliding downwards due to gravity. Simultaneously, during slitting machine operation, the material, under the slitting machine's traction, passes through the feeding interval between the first and second shafts, meaning the material continuously contacts the blade, applying pressure in the second direction, causing the blade to rotate. The blade mounting section is equipped with a non-cylindrical protruding column or two or more cylindrical protruding columns, preventing the blade from rotating due to pressure in the second direction when it is fixed to the blade mounting section.

[0025] The cover plate and the blade are provided with through holes corresponding to the protruding column. The cover plate and the blade are fixed to the blade mounting part through the through holes, so that the cover plate and the blade are not easy to move relative to the blade mounting part.

[0026] The fixing plate and the cover plate are made of steel. The cover plate is made of steel and can be attracted and attached to the fixing plate by the magnetic components. The fixing plate is made of steel and makes the entire fixing plate magnetic when accommodating the magnetic components, so that the cover plate and the fixing plate are attached more tightly and firmly.

[0027] There are several tool holders and blades available, and different numbers of tool holders and blades can be installed according to different needs to improve production efficiency.

[0028] The slitting machine manufactured using the above technical solutions allows for convenient and quick blade replacement. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments, the accompanying drawings used are briefly described below:

[0030] Figure 1 Here is a schematic diagram of the cutting device structure in the embodiment;

[0031] Figure 2 Here is a schematic diagram of the tool holder and blade structure in the embodiment;

[0032] Figure 3 Here is a schematic diagram of the front structure of the fixing plate in the embodiment;

[0033] Figure 4 Here is a schematic diagram of the side structure of the fixing plate in the embodiment;

[0034] Figure 5 Here is a schematic diagram of the cover plate structure in the embodiment;

[0035] Figure 6 See: Schematic diagram of the blade structure in the embodiment.

[0036] Explanation of key figure labels:

[0037] First shaft 1; Second shaft 2; Tool holder 3; Blade 4; Fixing frame 5; Fixing plate 31; Cover plate 32; Magnetic suction component 33; Blade mounting part 34; Limiting groove 21; First through hole 311; Screw hole 312; Protruding column 313; Receiving cavity 314; Screw 315; Second through hole 321; Third through hole 41. Detailed Implementation

[0038] Unless otherwise specified, the terms “first,” “second,” or “third,” etc., in the claims and description are used to distinguish different objects and not to describe a particular order.

[0039] Unless otherwise specified, in the claims and description, the terms “center,” “lateral,” “longitudinal,” “horizontal,” “vertical,” “top,” “bottom,” “inner,” “outer,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “clockwise,” “counterclockwise,” etc., indicate the orientation or positional relationship based on the orientation and positional relationship shown in the drawings, and are only for the purpose of simplifying the description, and do not imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation.

[0040] Unless otherwise specified in the claims and description, the terms "fixed connection" or "fixed connection" shall be interpreted broadly to mean any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection, and fixed connection by other means or components.

[0041] In the claims and description, unless otherwise specified, the terms "comprising," "having," and variations thereof mean "including but not limited to."

[0042] In the claims and description, unless otherwise specified, the term "have" means that a technical feature that follows is part of a technical feature that precedes it.

[0043] The technical solutions in the embodiments will now be described clearly and completely with reference to the accompanying drawings.

[0044] See Figure 1 , Figure 1 A slitting machine cutting device is shown, used for cutting material conveyed along a second direction perpendicular to a first direction. In this embodiment, the left-right direction of the cutting device is the first direction, and the front-back direction perpendicular to the left-right direction of the cutting device is the second direction. The cutting device includes a first shaft 1, a second shaft 2, a blade holder 3, a blade 4, and a fixing frame 5. The first shaft 1 and the second shaft 2 extend along the first direction and are fixed to the fixing frame 5. A material conveying interval is formed between the first shaft 1 and the second shaft 2, and the material conveying direction is the second direction when the slitting machine is working. The first shaft 1 and the second shaft 2 are arranged in a vertical direction, with the first shaft 1 located above the second shaft 2, forming a material conveying interval between the two shafts, allowing material to pass below the first shaft 1 and above the second shaft 2. In this embodiment, the vertical direction is based on the direction in which the cutting device is placed, and the direction from the cutting device to the ground is the vertical direction.

[0045] The blade holder 3 is slidably mounted on the first shaft 1 along a first direction. The blade holder 3 slides along the first shaft 1 in the first direction and can be fixed to the first shaft 1 after sliding to the desired position. The material to be divided passes under the first shaft 1 along a second direction under the traction of the slitting machine. The first shaft 1 does not rotate during operation, and the position of the blade holder 3 remains unchanged after it is fixed. At this time, the blade 4 is located below the first shaft 1, with the cutting edge of the blade 4 corresponding to the second direction. When the material passes through the feeding interval along the second direction, it will be divided by the blade 4. When the blade holder 3 is located at different positions on the first shaft 1 along the first direction, it can divide the material into different widths.

[0046] Figure 2 , Figure 3 The diagram shows a tool holder 3 and a blade 4. The tool holder 3 includes a fixing plate 31, a cover plate 32, and a magnetic suction component 33. The fixing plate 31 has a blade mounting portion 34 at the end away from the first shaft 1. The magnetic suction component 33 is mounted on the fixing plate 31 or the cover plate 32, and fixes the cover plate 32 to the blade mounting portion 34 through magnetic attraction. The cover plate 32 and the fixing plate 31 then clamp and fix the blade 4. In this embodiment, the magnetic suction component 33 is mounted on the blade mounting portion 34 of the fixing plate 31, and the magnetic suction component 33 magnetically attracts the cover plate 32. Under magnetic attraction, the cover plate 32 cooperates with the blade mounting portion 34 to clamp and fix the blade 4. The blade 4 is a straight blade, with one end clamped and fixed by the blade mounting portion 34 and the cover plate 32, and the other end protruding from the tool holder 3. During use, the blade 4 wears down due to continuous contact with the material, reducing its cutting performance. This necessitates replacement of the blade 4. Furthermore, when cutting different materials, blades 4 need to be replaced with those suitable for each material. Therefore, frequent replacement of the blade 4 is required in production. In this application, replacing the blade 4 does not require special tools. Simply overcome the magnetic force of the magnetic component 33, remove the cover plate 32, replace the blade 4, and then close the cover plate 32. The cover plate 32, under magnetic force, clamps and secures the blade 4 with the blade mounting part 34, thus completing the replacement. In the prior art, replacing ring-shaped blades requires disassembling each ring individually and then calibrating the interval between the upper and lower blades, a cumbersome process. In the prior art, when using straight blades, the blades are fixed to the blade holder using screws or other fasteners. Replacing the blade requires loosening and tightening screws or disassembling other fasteners, a cumbersome and inefficient process. This embodiment provides a simple and quick blade replacement process, improving replacement efficiency.

[0047] The second shaft 2 is provided with multiple limiting grooves 21 along the first direction, with the opening of each limiting groove 21 facing the blade holder 3, so that the blade 4 corresponding to the position of the limiting groove 21 can be inserted into the limiting groove 21. When the slitting machine pulls material through the feeding interval between the first shaft 1 and the second shaft 2, the second shaft supports the material, and the blade 4 located at this position cuts the material. If the second shaft 2 does not have limiting grooves 21, the cutting edge of the blade 4 can only be located on the surface close to the second shaft 2, and there may be a gap between the cutting edge of the blade 4 and the surface of the second shaft 2. When cutting very thin materials, the material may pass through the gap between the cutting edge of the blade 4 and the surface of the second shaft 2, thus failing to cut the material. With limiting grooves 21 on the second shaft 2, the blade 4 is inserted into the corresponding limiting groove 21. This design ensures that there is no gap between the cutting edge of the blade 4 and the surface of the second shaft 2, and the material passing through the feeding interval between the first shaft 1 and the second shaft 2 will be cut by the blade 4, improving the slitting yield. Blade 4 is a straight blade. When the material passes through blade 4, it is cut by blade 4. The stress is released when the material is cut, and pressure is applied to blade 4 in the left and right directions. According to the lever principle, the cutting edge of blade 4 is far away from the clamping and fixing parts of blade mounting part 34 and cover plate 32, that is, the lever arm is large. At this time, blade 4 will swing in the left and right direction during the material cutting process, resulting in inaccurate cutting dimensions. The cutting edge of blade 4 extends into the limiting groove 21, and the left and right swing distance of blade 4 is limited within the left and right direction of the limiting groove 21. This prevents blade 4 from damaging the material due to excessive left and right swing, thereby improving the slitting accuracy and yield.

[0048] In a preferred embodiment, the end of the fixing plate 31 connected to the first shaft has a first through hole 311 and a screw hole 312. The screw hole 312 penetrates the outer wall of the fixing plate 31 and the outer wall of the first through hole 311. The fixing plate 31 is slidably fitted onto the first shaft 1 through the first through hole 311. One end of the fixing plate 31 has a through hole 311 extending in a first direction. The size of the first through hole 311 is suitable for slidably fitting onto the outside of the first shaft 1 and sliding along the first direction on the first shaft 1. When sliding to different parts of the first shaft 1, materials of different widths can be provided. The fixing plate 31 is slidably connected to the first shaft 1 through the first through hole 311, simplifying the connection method and reducing the manufacturing cost of the fixing plate 31.

[0049] In a preferred embodiment, the fixing plate 31 includes screws 315, which, through screw holes 312, fix the fixing plate 31 to the first shaft 1. The fixing plate 31 slides along the first shaft 1 in a first direction. When it slides to the desired position, the fixing plate 31 must be fixed to the first shaft 1 to prevent it from moving during material cutting, thus preventing the blade 4 from moving and improving cutting accuracy. Using screws 315 to fix the fixing plate 31 to the first shaft 1 simplifies the fixing method and further reduces manufacturing costs.

[0050] like Figure 4 As shown, in this embodiment, the blade mounting portion 34 is provided with a receiving cavity 314 for accommodating the magnetic suction component 33. The magnetic suction component 33 is a magnet, which is installed in the receiving cavity 314. The magnetic suction component 33 is installed on the blade mounting portion 34, and the cover plate 32 is fixed together with the blade mounting portion 34 under the magnetic attraction of the magnetic suction component 33, clamping and fixing the blade 4 located between the two.

[0051] When the slitting machine performs slitting operations, the material, under the traction of the slitting machine, continuously contacts the blade 4 along the second direction, continuously applying pressure to the blade 4 in the second direction. At this time, the blade 4 is prone to rotate along the second direction, that is, rotate in the same direction as the material conveying direction. Therefore, a protruding column 313 is provided in the blade mounting part 34. In this embodiment, two cylindrical protruding columns 313 are provided. In other embodiments, one non-cylindrical protruding column can be provided. If only one cylindrical protruding column 313 is provided, the blade 4 will still rotate along the second direction. Figure 5 and Figure 6 As shown, the cover plate 32 has a second through hole 321 corresponding to the protruding post 313, and the blade 4 has a third through hole 41 corresponding to the protruding post 313. When the blade 4 is fixed to the blade mounting part 34, the third through hole 41 of the blade 4 fits around the protruding post 313. Because there are two protruding posts 313, the blade 4 will not rotate around the protruding post 313, that is, the blade 4 will not rotate in the second direction due to the pressure applied by the material in the second direction. When the cover plate 32 is attracted and fixed to the blade mounting part 34 by a magnet, the second through hole 321 on the cover plate 32 fits around the protruding post 311.

[0052] In this embodiment, the fixing plate 31 and the cover plate 32 are made of steel. Steel has good hardness, is easy to process, is inexpensive, and can be attracted by magnets. The cover plate 32 is made of steel and is attached to the magnetic component 33 under the attraction of the magnetic component 33. The magnetic component 33 is installed on the blade mounting part 34, meaning the cover plate 32 is fixed to the blade mounting part 34. The fixing plate 31 is also made of steel. When the magnetic component 33 is installed on the blade mounting part 34, the entire fixing plate 31 becomes magnetic, allowing the cover plate 32 to be more securely fixed to it.

[0053] There are several blade holders 3 and blades 4. When slitting, different numbers of blade holders 3 and blades 4 can be used according to actual needs to divide the material into the required quantity.

[0054] In addition, this application also provides a slitting machine that includes the above-mentioned cutting device.

[0055] This application provides a slitting device, which includes a first shaft 1, a second shaft 2, a knife holder 3, a blade 4, and a fixing frame 5. The first shaft 1 and the second shaft 2 extend along a first direction and are fixed to the fixing frame 5, forming a material conveying interval between the two shafts. The material, under the traction of the slitting machine, passes through the material conveying interval along a second direction. The knife holder 3 includes a fixing plate 31, a cover plate 32, and a magnetic suction component 33. The fixing plate 31 has a blade mounting portion 34, and the magnetic suction component 33 is installed in the receiving cavity 314 of the blade mounting portion 34. The cover plate 32 is adapted to be fixed to the blade mounting portion 34. The blade 4 is located between the blade mounting portion 34 and the cover plate 32. Under the attraction of the magnetic suction component 33, the cover plate 32 cooperates with the blade mounting portion 34 to clamp and fix the blade 4. The fixing plate 31 has a first through hole 311 and a screw hole 312. The fixing plate 31 is slidably mounted on the first shaft 1 along the first direction through the first through hole 311. The fixing plate 31 includes screws 315, which can fix the fixing plate 31 to the first shaft 1 through screw holes 312. The blade mounting part 34 is also provided with two protruding columns 313. The cover plate 32 and the blade 4 are provided with through holes opposite to the protruding columns 313, making the structure composed of the three more stable. When replacing the blade 4, it is only necessary to overcome the magnetic force to remove the cover plate 32, replace the blade 4, and then replace the cover plate 32. The second shaft 2 is provided with multiple limiting grooves 21 along the first direction. The opening of each limiting groove faces the blade holder 3. The blade 4 can be inserted into the corresponding limiting groove 21, which can ensure that the material passing through the feeding interval is divided by the blade 4, and can also limit the swing of the blade 4 in the left and right directions, thereby improving production efficiency.

[0056] The description of the above specification and embodiments is used to explain the scope of protection of this application, but does not constitute a limitation on the scope of protection of this application.

Claims

1. A cutting device for cutting material conveyed along a second direction perpendicular to a first direction, characterized in that, It includes a first shaft (1), a second shaft (2), a tool holder (3), a cutting tool (4), and a fixing bracket (5); The first shaft (1) and the second shaft (2) extend along the first direction and are fixed to the fixed frame (5), and a gap is formed between them for conveying materials along the second direction; The tool holder (3) is fixedly and slidably mounted on the first shaft (1) along the first direction; The tool holder (3) includes a fixing plate (31), a cover plate (32), and a magnetic suction component (33). The fixing plate (31) has a blade mounting part (34) at one end away from the first shaft (1). The magnetic suction component (33) is installed on the fixing plate (31) or the cover plate (32) and is used to fix the cover plate (32) to the blade mounting part (34) by magnetic attraction, and to clamp and fix the blade (4) by the cover plate (32) and the fixing plate (31). The second shaft (2) is provided with a plurality of limiting grooves (21) along the first direction, and the opening of each limiting groove (21) faces the tool holder (3) so that the blade (4) corresponding to the position of the limiting groove (21) can be inserted into the limiting groove (21).

2. The cutting device as described in claim 1, characterized in that, The fixing plate (31) has a first through hole (311) and a screw hole (312) at one end connected to the first shaft (1). The fixing plate (31) is slidably installed on the first shaft (1) in a first direction through the first through hole (311). The screw hole (312) connects the outer wall of the fixing plate (31) with the outer wall of the first through hole (311).

3. The cutting device as described in claim 2, characterized in that, The fixing plate (31) includes screws (315), which fix the fixing plate (31) to the first shaft (1) through the screw holes (312).

4. The cutting device as described in claim 3, characterized in that, The blade mounting part (34) or the cover plate (32) is provided with a receiving cavity (314).

5. The cutting device as described in claim 4, characterized in that, The magnetic attraction component (33) is a magnet, which is installed in the accommodating cavity (314).

6. The cutting device as described in claim 5, characterized in that, The blade mounting part (34) is provided with a protruding column (313).

7. The cutting device as described in claim 6, characterized in that, The cover plate (32) is provided with a second through hole (321) corresponding to the protruding post (313), and the blade (4) is provided with a third through hole (41) corresponding to the protruding post (313).

8. The cutting device as described in claim 7, characterized in that, The fixing plate (31) and the cover plate (32) are made of steel.

9. The cutting device as described in claim 8, characterized in that, The tool holder (3) and the blade (4) are in several units.

10. A slitting machine, characterized in that, It employs a cutting device as described in any one of claims 1 to 9.

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