A die apparatus for a steel coil

Abstract

The application provides a steel coil cutter die device, and relates to the field of steel coil slitting equipment. The device comprises a feeding mechanism, a pressing mechanism and a cutting mechanism. The cutting mechanism comprises a machine base and fixed and movable cutters arranged in the machine base. The fixed cutter is fixedly arranged on the top of the machine base. Both sides of the top of the machine base are provided with an installation groove. The bottom of the installation groove is provided with a hydraulic cylinder. A fixed seat is arranged in one installation groove, and a redirection seat is arranged in the other installation groove. The side of the fixed seat facing the redirection seat is provided with a first insertion groove, and the side of the redirection seat facing the fixed seat is provided with a second insertion groove. One end of the movable cutter is arranged in the first insertion groove and can rotate in the first insertion groove. The other end of the movable cutter is arranged in the second insertion groove and can move up and down in the second insertion groove. The application has the effects of reducing the wear speed of the movable cutter and prolonging the service life of the movable cutter.

Description

Technical Field

[0001] This application relates to the field of steel coil slitting equipment, and in particular to a die device for steel coils. Background Technology

[0002] To facilitate the transportation of strip steel, the strip steel is wound into coils, and then uncoiled and cut before use to obtain sheet steel of the required size.

[0003] Chinese patent document CN209190853U discloses a cross-cutting mechanism, specifically comprising an upper cutter and a lower cutter. The upper cutter is mounted on an upper cutter holder, and the lower cutter is mounted on a lower cutter holder. The upper cutter holder is vertically movable above the lower cutter holder. The key feature is that the upper and lower cutters engage in a shearing cooperation, with the upper cutter mounted on the upper cutter holder by an elastic component. Under the action of elastic force, the cutting edge of the upper cutter closely adheres to the cutting edge of the lower cutter during shearing. This patent achieves the cutting of steel through the shearing cooperation of the upper and lower cutters.

[0004] However, in the aforementioned patent, the tilt state of the upper or lower cutter is unique, which makes the cutting edges of the upper and lower cutters that first come into contact with the steel prone to excessive wear, resulting in reduced flatness of the cut and even inability to cut quickly. Summary of the Invention

[0005] In order to improve the problem of concentrated wear and rapid wear rate of existing fixed-mount cutting tools during the cutting process, this application provides a cutting die device for steel coils.

[0006] This application provides a die-cutting device for steel coils, which adopts the following technical solution: A die-cutting device for steel coils includes a feeding mechanism, a pressing mechanism, and a cutting mechanism. The feeding mechanism feeds a sheet material to the pressing mechanism, the pressing mechanism presses the sheet material, and the cutting mechanism cuts the sheet material. The cutting mechanism includes a base and a fixed cutter and a movable cutter disposed within the base. The fixed cutter is fixedly disposed on the top of the base. Each side of the top of the base is provided with a mounting groove. A hydraulic cylinder is disposed at the bottom of the mounting groove. A fixed seat is disposed in one mounting groove and a redirecting seat is disposed in the other mounting groove. A first slot is disposed on the side of the fixed seat facing the redirecting seat, and a second slot is disposed on the side of the redirecting seat facing the fixed seat. One end of the movable cutter is located in the first slot and can rotate within the first slot, while the other end of the movable cutter is located in the second slot and can move up and down within the second slot.

[0007] By adopting the above technical solution, the unwound sheet metal is conveyed to the pressing mechanism via the feeding mechanism. When the sheet metal width between the pressing mechanism and the cutting mechanism meets the requirements, the feeding mechanism stops feeding, the pressing mechanism presses the sheet metal, and then the cutting mechanism cuts the sheet metal. The shearing action formed by the fixed cutter and the movable cutter enables rapid cutting of the sheet metal. After the movable cutter has been used for a period of time, changing its position in the second slot changes its tilt angle, thus changing the initial contact point between the movable cutter and the sheet metal. This prevents the movable cutter from cutting the sheet metal at the same position for an extended period, which could damage the cutting edge. This ensures a smooth cut while reducing wear on the movable cutter and extending its service life.

[0008] Optionally, the fixed cutter and the movable cutter are offset in the vertical direction, and the plate is located between the fixed cutter and the movable cutter.

[0009] By adopting the above technical solution, it is ensured that the fixed cutter and the movable cutter can perform a shearing action on the board, improve the cutting effect, and prevent the board from bending at the cut.

[0010] Optionally, the first slot is provided with a rotating seat, and one end of the movable cutter is hinged to the rotating seat; The slot of the second slot is located on one side of the redirector seat. The other side of the redirector seat is provided with two limiting holes and one sliding hole. The two limiting rods are arranged at intervals in the vertical direction. The sliding hole connects the two limiting holes. Both the limiting holes and the sliding hole are connected to the second slot. A limiting rod is inserted into one of the limiting holes. A rotating rod is sleeved on the side of the limiting rod facing the movable cutter. The other end of the movable cutter is hinged to the rotating rod.

[0011] By adopting the above technical solution, the side wall where the slot of the second slot is located and the side wall where the limiting hole is located are two opposite side walls. When it is necessary to adjust the tilt angle of the movable cutter, pull the limiting rod away from the redirecting seat, so that the part of the rotating rod that is sleeved in the limiting rod is exposed. When the limiting rod is completely disengaged from the limiting hole, one end of the rotating rod is located in the second slot and hinged to the movable cutter, and the other end of the rotating rod passes through the limiting hole and extends to the outside of the redirecting seat. Then, push the limiting rod and the rotating rod upward. Through the sliding between the limiting rod and the rotating rod, the tilt direction of the movable cutter can be changed. Finally, insert the limiting rod back into the limiting hole to fix the movable cutter. By adjusting the tilt angle of the movable cutter, the wear of the movable cutter is reduced.

[0012] Optionally, the end face of the limiting rod facing the rotating rod is provided with a receiving groove, and the end of the rotating rod not connected to the movable cutter is inserted into the receiving groove and slides in the receiving groove.

[0013] By adopting the above technical solution, the limiting rod plays a role in limiting the rotation rod, ensuring that the movable cutter can be in a fixed state after the tilt angle of the movable cutter is adjusted.

[0014] Optionally, the limiting hole is square, the inner diameter of the limiting hole is larger than the width of the sliding hole, the limiting rod is adapted to be inserted into the limiting hole, and the outer diameter of the rotating rod is smaller than the inner diameter of the limiting hole and can slide in the sliding hole.

[0015] By adopting the above technical solution, with the cooperation of the limiting rod and the limiting hole, the limiting rod cannot enter the sliding hole, and at the same time, the rotating rod cannot rotate in the vertical direction. This ensures that after the movable cutter moves vertically downward, it can form a shearing action with the fixed cutter, thereby quickly cutting the board.

[0016] Optionally, the bottom of the receiving groove is provided with a tension spring, one end of which is connected to the bottom of the receiving groove, and the other end of which is connected to the end of the rotating rod. The end face of the limiting rod facing away from the movable cutter has a through hole, and the end face of the rotating rod connected to the tension spring has a threaded hole. A locking bolt is inserted into the limiting rod. The head of the locking bolt passes through the through hole and is screwed into the threaded hole. The tail of the locking bolt presses against the end of the limiting rod.

[0017] By adopting the above technical solution, when the limiting rod is pulled outward, the tension spring is in a stretched state. Thus, after the rotating rod slides from one limiting hole into the sliding hole and then into another limiting hole, releasing the limiting rod allows for rapid reset. After the limiting rod is reinserted into the limiting hole, the locking bolt is screwed into the threaded hole. Due to the inclined design of the movable cutter, it generates an oblique pulling force on the rotating rod, causing the limiting rod on the outside of the rotating rod to tilt slightly, thus locking the limiting rod within the limiting hole. At this point, rotating the locking bolt pulls the movable cutter towards the inside of the second slot, reliably fixing the movable cutter.

[0018] Optionally, the through hole and the threaded hole are coaxially arranged, and the inner diameter of the through hole is larger than the outer diameter of the locking bolt.

[0019] By adopting the above technical solution, it is easier to quickly screw in the locking bolt, thereby improving the locking speed of the movable cutter.

[0020] Optionally, both the fixed seat and the redirecting seat are provided with through grooves on the side facing the pressing mechanism, and both the fixed seat and the redirecting seat are provided with receiving cavities inside, the receiving cavities communicating with the through grooves and extending in the vertical direction. An air bladder is provided inside the accommodating cavity, and a slider is provided at the bottom of the air bladder, the slider extending to the outside of the through groove; The pressing mechanism includes a crossbar and several pressing heads. The crossbar is connected to two sliders. The several pressing heads are spaced apart at the bottom of the crossbar. Each pressing head has an air jet hole on the side facing the fixed cutter. The air jet hole is connected to the airbag through an air pipe.

[0021] By adopting the above technical solution, the redirecting seat and the fixed seat move up and down synchronously under the drive of the hydraulic cylinder. When the crossbar moves down with the redirecting seat and the fixed seat, the pressure head will first contact the plate and realize the pressing and stopping effect on the plate. At this time, the redirecting seat and the fixed seat continue to move down, which will cause the slider and the air bag to be squeezed, thereby forcing the gas in the air bag into the air pipe, and then delivering it to the air jet hole of the pressure head through the air pipe, and finally blowing it towards the fixed cutter through the air jet hole. In this way, it can effectively blow away the debris on the surface of the plate and prevent the moving cutter or the fixed cutter from breaking due to the debris.

[0022] Optionally, the inner diameter of the accommodating cavity is larger than the width of the through groove, one end of the slider is fitted with the inner wall of the accommodating cavity, and the other end of the slider is fitted with the inner wall of the through groove.

[0023] By adopting the above technical solution, the slider can slide within the accommodating cavity and through groove without detaching from the accommodating cavity, ensuring the reliable squeezing effect of the slider on the airbag.

[0024] Optionally, the top of the airbag is fixedly connected to the top of the inner wall of the accommodating cavity, the bottom of the airbag is fixedly connected to the outer wall of the slider, and the side wall of the airbag is fitted to the inner wall of the accommodating cavity.

[0025] By adopting the above technical solution, when the movable cutter moves downward, the slider and the airbag are squeezed together, thereby forcing the gas inside the airbag into the trachea. When the movable cutter moves upward, the weight of the crossbar, the pressure head, and the slider itself can pull the airbag, thereby allowing external gas to be drawn into the airbag.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. By moving the movable cutter up and down at one end within the second slot, the movable cutter rotates around the rotating base, thereby allowing for rapid adjustment of the movable cutter's tilt direction. This avoids prolonged use of the same position of the movable cutter in cutting notches on the board, effectively reducing wear on the movable cutter.

[0027] 2. While the hydraulic cylinder drives the movable cutter up and down, it can also press the pressure head against the board. At the same time, the mutual compression between the slider and the air bladder forces the gas in the air bladder into the air pipe, and then ejects it through the jet hole connected to the air pipe, effectively blowing away debris from the surface of the board and preventing debris from causing the movable or fixed cutter to break. Attached Figure Description

[0028] Figure 1 This is a schematic perspective view of this application; Figure 2 This is a reference diagram showing the assembly state of the pressing mechanism and the cutting mechanism; Figure 3 It is a schematic 3D diagram of the pressing mechanism and the cutting mechanism; Figure 4 This is a cross-sectional view of the internal structure of the cutting mechanism; Figure 5 yes Figure 4 Reference diagram showing the action state of the middle limit lever when pulled out; Figure 6 yes Figure 5 Reference diagram showing the upward sliding motion of the central rotating rod; Figure 7 This is a cross-sectional view of the internal structure of the mounting base. Figure 1 ; Figure 8 This is a cross-sectional view of the internal structure of the mounting base. Figure 2 ; In the diagram: 1. Feeding mechanism; 2. Pressing mechanism; 21. Crossbar; 22. Press head; 221. Air jet hole; 222. Air pipe; 3. Cutting mechanism; 31. Machine base; 311. Mounting slot; 312. Hydraulic cylinder; 32. Fixed cutter; 33. Movable cutter; 34. Fixed base; 341. First slot; 342. Rotating base; 343. Through slot; 344. Receiving cavity; 345. Airbag; 346. Slider; 35. Redirecting seat; 351. Second slot; 352. Limiting hole; 353. Sliding hole; 354. Limiting rod; 3541. Receiving groove; 3542. Tension spring; 3543. Through hole; 355. Rotating rod; 3550. Threaded hole; 356. Locking bolt; 4. Board material. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0030] Figure 1This is a schematic perspective view of this application. Figure 2 This is a reference diagram showing the assembly state of the pressing and cutting mechanisms. (See also...) Figure 1 and Figure 2 A die-cutting device for steel coils includes a feeding mechanism 1, a pressing mechanism 2, and a cutting mechanism 3. The uncoiled sheet 4 is fed to the pressing mechanism 2 through the feeding mechanism 1. When the sheet 4 exceeds the length of the cutting mechanism 3 by a sufficient amount, the feeding mechanism 1 stops feeding, and at the same time, the pressing mechanism 2 presses the sheet 4. Then the cutting mechanism 3 operates to cut the sheet 4. The cutting mechanism 3 includes a base 31, a fixed cutter 32, and a movable cutter 33. A mounting groove 311 is provided on both sides of the top of the base 31. A hydraulic cylinder 312 is provided at the bottom of the mounting groove 311. A fixed seat 34 is provided in one mounting groove 311, and a redirecting seat 35 is provided in the other mounting groove 311. The fixed seat 34 and the redirecting seat 35 reciprocate in the vertical direction under the drive of the corresponding hydraulic cylinder 312. In order to improve the driving effect of the fixed seat 34 and the redirecting seat 35, the push rod of one hydraulic cylinder 312 can be fixedly connected to the bottom of the fixed seat 34, and the push rod of the other hydraulic cylinder 312 can be fixedly connected to the bottom of the redirecting seat 35. The fixed base 34 has a first slot 341 on the side facing the redirector 35, and the redirector 35 has a second slot 351 on the side facing the fixed base 34. One end of the movable cutter 33 is located in the first slot 341, and the other end of the movable cutter 33 is located in the second slot 351. The fixed cutter 32 is located on the top of the base 31 and is offset from the movable cutter 33 in the vertical direction.

[0031] Figure 3 This is a schematic 3D diagram of the pressing mechanism and the cutting mechanism. Figure 4 This is a cross-sectional view of the internal structure of the cutting mechanism. See also... Figure 3 and Figure 4A rotating seat 342 is provided in the first slot 341. One end of the movable cutter 33 is hinged to the rotating seat 342, and the other end of the movable cutter 33 can rotate around the rotating seat 342. Two limiting holes 352 and one sliding hole 353 are provided on the outer wall of the redirector seat 35. The two limiting holes 352 are arranged at intervals along a vertical line, and the sliding hole 353 is used to connect the two limiting holes 352. At the same time, the two limiting holes 352 and the sliding hole 353 are all connected to the second slot 351. A limiting rod 354 is inserted in the limiting hole 352. The limiting hole 352 is square, and the limiting rod 354 is also quadrangular prism. The outer wall of the limiting rod 354 fits against the inner wall of the limiting hole 352. One end of the limiting rod 354 is located in the second slot 351, and the other end of the limiting rod 354 extends to the outside of the redirector seat 35 through the limiting hole 352. The end face of the limiting rod 354 located in the second slot 351 is provided with a receiving groove 3541. The receiving groove 3541 extends along the axial direction of the limiting rod 354. A rotating rod 355 is also provided in the second slot 351. One end of the rotating rod 355 is hinged to the movable cutter 33, and the other end of the rotating rod 355 is inserted into the receiving groove 3541. The other end of the rotating rod 355 is located outside the redirecting seat 35.

[0032] The plane of the rotating seat 342 is located between the planes of the two limiting holes 352. In this way, when the limiting rod 354 is inserted into either of the limiting holes 352, the movable cutter 33 can be tilted. When it is necessary to adjust the tilt of the movable cutter 33, pull the limiting rod 354 away from the redirector seat 35 until the limiting rod 354 moves out of the limiting hole 352. At this time, the rotating rod 355 is still inserted in the receiving groove 3541. Then push the limiting rod 354 upward so that the rotating rod 355 is lifted into the sliding hole 353 and slides upward in the sliding hole 353. Then the rotating rod 355 will enter another limiting hole 352. Finally, insert the limiting rod 354 into the limiting hole 352. Since the outer diameter of the rotating rod 355 is smaller than the inner diameter of the limiting hole 352 and the rotating rod 355 can slide in the sliding hole 353, the tilt direction of the movable cutter 33 can be changed and fixed after the change. As the tilting direction of the movable cutter 33 changes, the length of the rotating rod 355 extending to the outside of the sliding hole 353 will change. In other words, the rotating rod 355 has sufficient length to maintain its docking with the receiving groove 3541, thereby ensuring reliable adjustment of the tilting direction.

[0033] By adjusting the tilt direction of the movable cutter 33, the initial position of the movable cutter 33 in contact with the board 4 is adjusted. This effectively prevents the movable cutter 33 from wearing out too quickly due to prolonged contact with the board 4 at the same position and cutting a notch at that position, thus effectively extending the service life of the movable cutter 33.

[0034] Figure 5 yes Figure 4 Reference diagram of the action state of the middle limit lever being pulled out. Figure 6 yes Figure 5 A reference diagram showing the upward sliding motion of the central rotating lever. (See also...) Figure 5 and Figure 6 A tension spring 3542 is provided at the bottom of the receiving groove 3541. One end of the tension spring 3542 is connected to the bottom of the receiving groove 3541, and the other end of the tension spring 3542 is connected to the end of the rotating rod 355. The end of the limiting rod 354 facing away from the movable cutter 33 (i.e., the end located outside the redirector seat 35) has a through hole 3543. The end of the rotating rod 355 connected to the tension spring 3542 has a threaded hole 3550. The through hole 3543, the threaded hole 3550 and the tension spring 3542 are coaxially arranged. A locking bolt 356 is inserted into the limiting rod 354. The head of the locking bolt 356 passes through the through hole 3543 and is screwed into the threaded hole 3550. The tail of the locking bolt 356 presses against the end of the limiting rod 354. At the same time, the outer diameter of the locking bolt 356 is smaller than the inner diameter of the through hole 3543. In this way, the locking bolt 356 can be accurately and quickly inserted into the through hole 3543 and screwed into the threaded hole 3550. When adjusting the tilt direction of the movable cutter 33, the limiting rod 354 can be pulled quickly. Under the connection of the tension spring 3542, the rotating rod 355 can be effectively prevented from falling out of the receiving groove 3541 of the limiting rod 354. Furthermore, after the tilt direction is adjusted, under the pulling force of the tension spring 3542, the limiting rod 354 can be quickly reset and inserted into the limiting hole 352.

[0035] When the limiting rod 354 is inserted into the limiting hole 352, the cooperation between the limiting rod 354 and the limiting hole 352 prevents the rotating rod 355 from sliding, thus achieving the initial fixation of the movable cutter 33. Due to the inclined setting of the movable cutter 33, the movable cutter 33 will generate an inclined pulling force on the rotating rod 355 and the limiting rod 354, which will cause the limiting rod 354 to be stuck in the limiting hole 352. At this time, by screwing in the locking bolt 356, the movable cutter 33 can be pulled towards the inside of the second slot 351 under the support of the limiting rod 354, thus reliably fixing the movable cutter 33 between the first slot 341 and the second slot 351.

[0036] Figure 7 This is a cross-sectional view of the internal structure of the mounting base. Figure 1 , Figure 8 This is a cross-sectional view of the internal structure of the mounting base. Figure 2 See also Figure 7 and Figure 8 and combined Figure 6Both the fixed seat 34 facing the pressing mechanism 2 and the redirecting seat 35 facing the pressing mechanism 2 are provided with through grooves 343. Both the fixed seat 34 and the redirecting seat 35 are provided with accommodating cavities 344. The accommodating cavities 344 are connected to the through grooves 343 and both extend in the vertical direction. The inner diameter of the accommodating cavity 344 is larger than the width of the through groove 343. In this way, a space with an inverted convex radial cross section is formed between the through groove 343 and the accommodating cavity 344. An airbag 345 and a slider 346 are provided within the accommodating cavity 344. The top of the airbag 345 is fixedly connected to the top of the inner wall of the accommodating cavity 344, and the bottom of the airbag 345 is fixedly connected to the outer wall of the slider 346. The sidewall of the airbag 345 is fitted against the inner wall of the accommodating cavity 344. One end of the slider 346 is located inside the accommodating cavity 344 and is fitted against the inner wall of the accommodating cavity 344. The other end of the slider 346 extends to the outside of the through groove 343. In this way, one end of the airbag 345 is fixed, and the other end of the airbag 345 can be displaced under the action of the slider 346, thereby realizing the compression and exhaust of the airbag 345. The fit between the sidewall of the airbag 345 and the inner wall of the accommodating cavity 344 ensures that the airbag 345 can reliably deform during exhaust and will not be damaged due to pulling against the inner wall of the accommodating cavity 344.

[0037] See Figure 2 and Figure 8 The pressing mechanism 2 includes a crossbar 21 and several pressing heads 22. One end of the crossbar 21 is connected to the slider 346 in the fixed seat 34, and the other end of the crossbar 21 is connected to the slider 346 in the redirecting seat 35.

[0038] See Figure 1 and Figure 2 Several pressure heads 22 are spaced apart at the bottom of the crossbar 21. The bottom of the pressure head 22 is located below the bottom of the movable cutter 33. In this way, when the hydraulic cylinder 312 drives the fixed seat 34 and the redirecting seat 35 to move downward synchronously, the pressure head 22 will first contact the plate 4, thereby achieving the pressing and stopping effect on the plate 4.

[0039] See Figure 1 and Figure 8As the fixed seat 34 and the redirecting seat 35 continue to move downwards, the positions of the pressure head 22, the crossbar 21, and the slider 346 remain fixed. With the movement of the fixed seat 34 and the redirecting seat 35, the slider 346 exerts a squeezing effect on the airbag 345. The bottom of the airbag 345 is equipped with an air tube 222, which extends to the outside of the through groove 343 after passing through the slider 346. The pressure head 22 has an air jet hole 221 on the side facing the fixed cutter 32. The air tube 222 is inserted into the pressure head 22 and communicates with the air jet hole 221. In this way, the gas inside the airbag 345 is squeezed into the air tube 222 (the air tube 222 is inside the receiving cavity 344). With sufficient length or elasticity to ensure that the air tube 222 does not break when the slider 346 moves and compresses the airbag 345, the air is then ejected from the air jet hole 221. Since the air jet hole 221 faces the fixed cutter 32 and the plate 4 is located between the fixed cutter 32 and the movable cutter 33, the gas ejected from the multiple air jet holes 221 can blow away the plate 4 before the movable cutter contacts it, effectively removing debris from the surface of the plate 4 and preventing the blades of the movable cutter 33 or the fixed cutter 32 from breaking after contacting hard debris, thus further improving the service life of the movable cutter 33 and the fixed cutter 32.

[0040] After the movable cutter 33 and the fixed cutter 32 complete the cutting of the plate 4, the hydraulic cylinder 312 will push the fixed seat 34 and the redirecting seat 35 to move upward synchronously. During this process, the weight of the crossbar 21, the pressure head 22 and the slider 346 will pull the airbag 345, which will increase the distance between the top and bottom of the airbag 345. In this way, external gas can be drawn into the airbag 345 through the jet hole 221 and the air pipe 222, so as to automatically replenish the gas in the airbag 345.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A die-cutting device for steel coils, characterized in that, It includes a feeding mechanism (1), a pressing mechanism (2) and a cutting mechanism (3). The feeding mechanism (1) feeds the plate (4) to the pressing mechanism (2), the pressing mechanism (2) presses the plate (4) down, and the cutting mechanism (3) cuts the plate (4). The cutting mechanism (3) includes a base (31) and a fixed cutter (32) and a movable cutter (33) disposed in the base (31). The fixed cutter (32) is fixedly disposed on the top of the base (31). A mounting groove (311) is provided on both sides of the top of the base (31). A hydraulic cylinder (312) is provided at the bottom of the mounting groove (311). A fixed seat (34) is provided in one mounting groove (311), and a redirecting seat (35) is provided in the other mounting groove (311). A first slot (341) is provided on the side of the fixed seat (34) facing the redirecting seat (35), and a second slot (351) is provided on the side of the redirecting seat (35) facing the fixed seat (34). One end of the movable cutter (33) is located in the first slot (341) and can rotate in the first slot (341), and the other end of the movable cutter (33) is located in the second slot (351) and can move up and down in the second slot (351); The first slot (341) is provided with a rotating seat (342), and one end of the movable cutter (33) is hinged to the rotating seat (342); The slot of the second slot (351) is located on one side of the redirector seat (35). The other side of the redirector seat (35) is provided with two limiting holes (352) and a sliding hole (353). The two limiting holes (352) are arranged at intervals in the vertical direction. The sliding hole (353) connects the two limiting holes (352). Both the limiting holes (352) and the sliding hole (353) are connected to the second slot (351). A limiting rod (354) is inserted into one of the limiting holes (352). A rotating rod (355) is sleeved on the side of the limiting rod (354) facing the movable cutter (33). The other end of the movable cutter (33) is hinged to the rotating rod (355).

2. The die-cutting device for steel coils according to claim 1, characterized in that, The fixed cutter (32) and the movable cutter (33) are offset in the vertical direction, and the plate (4) is located between the fixed cutter (32) and the movable cutter (33).

3. The die-cutting device for steel coils according to claim 1, characterized in that, The limiting rod (354) has a receiving groove (3541) on one end face facing the rotating rod (355). The end of the rotating rod (355) that is not connected to the movable cutter (33) is inserted into the receiving groove (3541) and slides in the receiving groove (3541).

4. The die-cutting device for steel coils according to claim 3, characterized in that, The limiting hole (352) is square, and the inner diameter of the limiting hole (352) is larger than the width of the sliding hole (353). The limiting rod (354) is adapted to be inserted into the limiting hole (352). The outer diameter of the rotating rod (355) is smaller than the inner diameter of the limiting hole (352) and can slide in the sliding hole (353).

5. A die-cutting device for steel coils according to claim 4, characterized in that, The bottom of the receiving groove (3541) is provided with a tension spring (3542), one end of the tension spring (3542) is connected to the bottom of the receiving groove (3541), and the other end of the tension spring (3542) is connected to the end of the rotating rod (355). The limiting rod (354) has a through hole (3543) on one end face facing away from the movable cutter (33), and the rotating rod (355) has a threaded hole (3550) on one end face connected to the tension spring (3542). A locking bolt (356) is inserted into the limiting rod (354), the head of the locking bolt (356) passes through the through hole (3543) and is screwed into the threaded hole (3550) in a suitable manner, and the tail of the locking bolt (356) presses against the end of the limiting rod (354).

6. A die-cutting device for steel coils according to claim 5, characterized in that, The through hole (3543) is coaxially arranged with the threaded hole (3550), and the inner diameter of the through hole (3543) is larger than the outer diameter of the locking bolt (356).

7. A die-cutting device for steel coils according to claim 5, characterized in that, Both the fixed seat (34) facing the pressing mechanism (2) and the redirecting seat (35) facing the pressing mechanism (2) are provided with through grooves (343). Both the fixed seat (34) and the redirecting seat (35) are provided with accommodating cavities (344). The accommodating cavities (344) are connected to the through grooves (343) and both extend in the vertical direction. An airbag (345) is provided inside the accommodating cavity (344), and a slider (346) is provided at the bottom of the airbag (345), the slider (346) extending to the outside of the through groove (343); The pressing mechanism (2) includes a crossbar (21) and a plurality of pressing heads (22). The crossbar (21) is connected to two sliders (346). The plurality of pressing heads (22) are spaced apart at the bottom of the crossbar (21). The pressing head (22) has an air jet hole (221) on the side facing the fixed cutter (32). The air jet hole (221) is connected to the airbag (345) through an air pipe (222).

8. A die-cutting device for steel coils according to claim 7, characterized in that, The inner diameter of the accommodating cavity (344) is greater than the width of the through groove (343). One end of the slider (346) is in contact with the inner wall of the accommodating cavity (344), and the other end of the slider (346) is in contact with the inner wall of the through groove (343).

9. A die-cutting device for steel coils according to claim 7, characterized in that, The top of the airbag (345) is fixedly connected to the top of the inner wall of the accommodating cavity (344), the bottom of the airbag (345) is fixedly connected to the outer wall of the slider (346), and the side wall of the airbag (345) is in contact with the inner wall of the accommodating cavity (344).

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