Stable steel coil slitting equipment

Abstract

The invention relates to the technical field of steel coil machining, in particular to stable steel coil slitting equipment which comprises a rack, an upper slitting cutting mechanism and a lower slitting cutting mechanism are arranged on the rack in the vertical direction at intervals, the upper slitting cutting mechanism comprises a slitting roller arranged in the horizontal direction, and a plurality of fixing discs are fixed to the periphery of the slitting roller; a mounting disc is arranged between every two adjacent fixed discs; four arc-shaped slitting cutters are uniformly distributed on the periphery of the mounting disc in the circumferential direction of the mounting disc, and moving frames are arranged at the two ends of the mounting disc respectively; radial unfolding and folding mechanisms are connected between the two oppositely-arranged arc-shaped slitting cutters and one moving frame and between the other two oppositely-arranged arc-shaped slitting cutters and the other moving frame. Through cooperation of the arc-shaped slitting cutter, the moving frame and the radial unfolding and folding mechanism, rapid switching between two mainstream slitting distances can be achieved, manual checking of the cutter distance and manual dismounting or mounting of the slitting cutter are not needed, the shutdown time of a production line is greatly shortened, and the production efficiency is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel coil processing, in particular to a stable steel coil slitting equipment. BACKGROUND

[0002] In the steel coil production process, wide steel coils need to be cut into steel strips of different widths by a slitting equipment first, so as to adapt to the processing requirements of downstream forming processes such as stamping, bending and welding, and the machining precision and efficiency directly determine the product quality and production rhythm of subsequent steel applications.

[0003] The existing steel coil slitting equipment mainly consists of a rack, upper and lower symmetrical slitting cutting mechanisms and a driving mechanism; wherein, the two groups of slitting cutting mechanisms are equipped with horizontally extending slitting rollers, and a plurality of circular slitting knives are fixed on the outer periphery of the slitting rollers in the axial direction. During slitting operation, the steel coil is conveyed horizontally between the upper and lower slitting knives, and the wide steel coil is synchronously cut into a plurality of narrow steel strips of preset width through the shearing action of the knives, completing the slitting process.

[0004] In actual production scenarios, 200mm and 100mm are the most mainstream specifications for steel coil slitting; among them, steel strips of 200mm width are mainly used for automobile body structural parts (such as frame longitudinal beams, door reinforcement bars), photovoltaic support main beams and other application scenarios with high structural strength requirements. Steel strips of 100mm width are suitable for the manufacture of light-weight, high-precision components such as household appliance interior parts (such as washing machine drawer guide rails) and precision hardware parts (such as small spring sheets), and the two specifications cover nearly 60% of the demand for civil and industrial steel strips.

[0005] However, the circular slitting knives of the existing slitting equipment are rigidly fixed to the outer periphery of the slitting roller by bolts, and when switching between the 200mm and 100mm specifications, the user needs to manually disassemble all the circular slitting knives on the upper and lower slitting rollers one by one (including removing the fixing bolts and taking out the knife assemblies), then recalculates the knife spacing according to the target slitting width, and then installs the appropriate knife assembly one by one. The whole process of changing and adjusting the knives is long, not only the operation is complicated and the labor cost is high, but also it will cause the production line to be shut down for a long time, which seriously affects the production efficiency. Therefore, we propose a stable steel coil slitting equipment to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a stable steel coil slitting equipment to solve the problem of long knife adjustment time when switching between the 200mm and 100mm specifications in the prior art presented in the background.

[0007] The application is realized by the technical scheme that the stable steel coil slitting equipment comprises a rack, upper and lower slitting cutting mechanisms are arranged on the rack in a vertical direction, a driving mechanism is installed on the rack and is used for driving the upper and lower slitting cutting mechanisms to rotate in opposite directions; The upper slitting cutting mechanism comprises a slitting roller arranged in a horizontal direction, the slitting roller is rotationally connected to the rack and is in transmission connection with the driving mechanism, a plurality of fixed discs are fixed on the outer periphery of the slitting roller at equal intervals in the axial direction, annular slitting knives are fixed on the outer periphery of each fixed disc, and mounting discs are arranged between adjacent two fixed discs and are fixed on the outer periphery of the slitting roller. Four arc-shaped slitting knives are uniformly distributed on the outer periphery of each mounting disc in the circumferential direction, and two moving frames are arranged at the two ends of each mounting disc and can move away from or close to each other in the axial direction of the mounting disc. Radial expansion and contraction mechanisms are connected between the two arc-shaped slitting knives of each moving frame and between the other two arc-shaped slitting knives of the other moving frame, and are used for driving the two arc-shaped slitting knives to contract or expand in the radial direction of the mounting disc. When the two moving frames close to each other to the limiting position, the four arc-shaped slitting knives are located on the outer periphery of the mounting disc and jointly form an annular cutting structure. When the two moving frames move away from each other to the limiting position, the two arc-shaped slitting knives close to each other to the end face of the mounting disc.

[0008] Optionally, the cutting edges of the upper and lower slitting cutting mechanisms correspond to each other in the vertical direction and engage with each other.

[0009] Optionally, the driving mechanism comprises a driving motor installed on the rack, the output end of the driving motor is in transmission connection with the slitting roller, and the slitting roller is in transmission connection with the lower slitting cutting mechanism through a belt wheel assembly and a transmission belt.

[0010] Optionally, the spacing between the annular cutting structure and the two adjacent annular slitting knives is equal.

[0011] Optionally, the slitting roller is internally provided with a cavity, a threaded rod is rotationally connected in the slitting roller, and the threaded rod is coaxially arranged with the slitting roller. A threaded segment corresponding to each moving frame is arranged on the threaded rod, each moving frame is threadedly connected to the corresponding threaded segment, and a clearance hole is formed in the slitting roller for the moving frame to move in the axial direction of the slitting roller.

[0012] Optionally, an operating rod is rotationally connected to the proximal end of the slitting roller, the axis of the operating rod is perpendicular to the axis of the slitting roller, one end of the operating rod extends into the slitting roller and is connected to the threaded rod through a reverser.

[0013] Optionally, the radial unfolding mechanism includes two connecting rods radially distributed along the mounting plate. The ends of the two connecting rods that are far apart from each other are fixedly connected to two oppositely arranged arc-shaped slitting blades, and the ends of the two connecting rods that are close to each other are slidably connected to the moving frame.

[0014] Optionally, a sliding column is rotatably connected to the end of each connecting rod near the movable frame, and the axis of each sliding column is perpendicular to the axis of the mounting plate. A sliding groove is fixed on the end face of the mounting plate for each sliding column to slide one by one, and each sliding groove extends along the moving direction of the moving frame.

[0015] Optionally, the chute includes a first inclined chute and a second inclined chute arranged sequentially along the moving direction of the moving frame, and the first inclined chute and the second inclined chute cooperate to form a V-shaped structure; As the sliding column slides along the first and second inclined grooves in sequence, the corresponding arc-shaped slitting blade first expands radially along the mounting plate and then contracts radially along the mounting plate.

[0016] Optionally, the outer diameter of the annular cutting structure is the same as the outer diameter of the annular slitting blade; When the curved slitting blade retracts to the end face of the mounting plate, the outer edge of the curved slitting blade does not extend beyond the outer edge of the mounting plate.

[0017] Compared with the prior art, the present invention provides a stable steel coil slitting device, which has the following beneficial effects: 1. This invention, through the cooperation of an arc-shaped slitting knife, a moving frame, and a radial unfolding and retracting mechanism, enables rapid switching between two mainstream slitting spacings. It eliminates the need for manual calculation of knife spacing, disassembly or installation of slitting knives, significantly reducing production line downtime and substantially improving production efficiency.

[0018] 2. Through the cooperation of the sliding column and the sliding groove, when two adjacent arc-shaped slitting blades are offset from each other along the axial direction of the mounting plate, the arc-shaped slitting blades first expand radially along the mounting plate and then contract radially. Compared with the two adjacent arc-shaped slitting blades being directly offset axially, the "expansion first" allows the two adjacent arc-shaped slitting blades to form a safe clearance distance, reducing the interference friction of the blade body or cutting edge. Attached Figure Description

[0019] Figure 1 This is the left view of the present invention; Figure 2 This is a right view of the present invention; Figure 3 This is a schematic diagram of the fixing disk of the present invention; Figure 4 This is a schematic diagram of one side of the installation disk of the present invention; Figure 5 This is a schematic diagram of the other side of the installation disk of the present invention; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a diagram showing the state of the arc-shaped slitting knife of the present invention when it is in use; Figure 8 This is a diagram showing the state of the arc-shaped slitting knife of the present invention when it is unfolded; Figure 9 This is a diagram showing the state of the arc-shaped slitting knife of the present invention when it is retracted.

[0020] In the diagram: 1. Frame; 2. Upper slitting and cutting mechanism; 201. Slitting roller; 202. Fixed plate; 203. Annular slitting knife; 204. Mounting plate; 205. Arc-shaped slitting knife; 3. Lower slitting and cutting mechanism; 4. Drive mechanism; 5. Moving frame; 6. Radial unfolding and retracting mechanism; 601. Connecting rod; 602. Sliding column; 603. Sliding groove; 7. Threaded rod; 8. Clearance hole. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1 to 9 A stable steel coil slitting device includes a frame 1, which provides a stable mounting foundation and support frame for the various functional components of the device. An upper slitting cutting mechanism 2 and a lower slitting cutting mechanism 3 are arranged vertically at intervals on the frame 1. It should be noted that the structure of the lower slitting cutting mechanism 3 is the same as that of the upper slitting cutting mechanism 2, only the installation position is different. Simultaneously, the cutting blades of the upper slitting cutting mechanism 2 and the lower slitting cutting mechanism 3 are vertically aligned and interlocked. The gap between the blades can be finely adjusted according to the thickness of the steel coil, thereby achieving continuous and uniform cutting during the steel coil conveying process and ensuring the flatness of the cut of the narrow steel strip. In addition, a drive mechanism 4 is installed on the frame 1, which serves as the power source for the device, driving the upper slitting cutting mechanism 2 and the lower slitting cutting mechanism 3 to rotate in opposite directions, forming a relative shearing motion.

[0023] To specifically address the issue of excessively long changeover times caused by manual blade disassembly and replacement when switching between the two mainstream steel coil slitting specifications of 200mm and 100mm in existing steel coil slitting equipment, the following design is proposed: The upper slitting and cutting mechanism 2 includes a slitting roller 201 arranged horizontally, which is the core load-bearing component. The slitting roller 201 is rotatably connected to the frame 1 and is transmitted to the drive mechanism 4, enabling stable rotation under the action of driving force, providing a reliable foundation for subsequent slitting operations. Several fixed discs 202 are fixed at equal intervals along the axial direction on the outer periphery of the slitting roller 201, and an annular slitting knife 203 is fixed on the outer periphery of each fixed disc 202. The cutting edge is precision ground to ensure the flatness of the steel strip cut during slitting.

[0024] An mounting plate 204 is provided between two adjacent fixed plates 202. Each mounting plate 204 is fixed to the outer periphery of the slitting roller 201 and is symmetrically distributed with the two fixed plates 202, forming an alternating arrangement structure of "fixed plate-mounting plate-fixed plate". Four arc-shaped slitting blades 205 are evenly distributed along the circumference of the outer periphery of the mounting plate 204. The cutting edge of the arc-shaped slitting blades 205 is aligned with the cutting direction of the annular slitting blade 203, and the material and heat treatment process are the same as those of the annular slitting blade 203 to ensure uniform slitting performance.

[0025] To enable switching between the two specifications, movable frames 5 are respectively provided at both ends of the mounting plate 204. The two movable frames 5 can move away from or towards each other along the axial direction of the mounting plate 204, and can rotate synchronously with the slitting roller 201. At the same time, radial unfolding and retracting mechanisms 6 are connected between the two oppositely arranged arc-shaped slitting knives 205 and one movable frame 5, and between the other two oppositely arranged arc-shaped slitting knives 205 and the other movable frame 5. The radial unfolding and retracting mechanisms 6 are used to drive the two oppositely arranged arc-shaped slitting knives 205 to retract or unfold radially along the mounting plate 204.

[0026] When the two movable frames 5 approach each other to the limit position, the four arc-shaped slitting blades 205 are located on the outer periphery of the mounting plate 204 and together form an annular cutting structure. The outer diameter of the annular cutting structure is the same as the outer diameter of the annular slitting blades 203. Through the cooperation of the annular cutting structure and the annular slitting blades 203, the steel coil is cut into smaller steel strips.

[0027] When the two movable frames 5 move away from each other to the limit position, the two opposing arc-shaped slitting blades 205 retract to the end face of the mounting plate 204. At this time, the outer edge of the arc-shaped slitting blade 205 does not exceed the outer edge of the mounting plate 204, and can only be slit by the annular slitting blade 203, thereby slitting the steel coil into large-size steel strips.

[0028] In this embodiment, the spacing between the annular cutting structure and the two adjacent annular slitting blades is equal. Specifically, the spacing between two adjacent annular slitting blades 203 is 200mm, adapting to the slitting requirements of large-size steel strips. The annular cutting structure formed by the four arc-shaped slitting blades 205 has a spacing of 100mm between it and the two adjacent annular slitting blades 203, which can adapt to the slitting requirements of small sizes. Through this preset spacing design, two mainstream sizes can be covered without additional adjustments to the blade layout, laying the structural foundation for rapid switching.

[0029] Using the above design, when it is necessary to slit 100mm small-gauge steel strips, the two moving frames 5 approach each other along the axial direction to the limit position. At this time, the radial unfolding mechanism 6 synchronously drives the four arc-shaped slitting blades 205 to jointly enclose and form a complete annular cutting structure around the outer periphery of the mounting plate 204. Since the outer diameter of this annular cutting structure is consistent with the outer diameter of the annular slitting blade 203, it can engage with the corresponding blade of the lower slitting mechanism 3, and work with the annular slitting blade 203 to achieve continuous slitting at 100mm intervals.

[0030] When switching to 200mm large-specification steel strip slitting, the two moving frames 5 move axially away from each other to their limit positions. The radial unfolding and retracting mechanism 6 drives the two sets of oppositely arranged arc-shaped slitting blades 205 to retract radially inward, eventually reaching both ends of the mounting plate 204. At this time, the outer edges of each arc-shaped slitting blade 205 do not exceed the outer edge of the mounting plate 204, avoiding interference with the steel coil or other components. Only the annular slitting blade 203 engages with the corresponding blade of the lower slitting and cutting mechanism 3, achieving 200mm spacing slitting. With this design, there is no need to disassemble or replace any blades; the two specifications can be quickly switched simply by adjusting the axial position of the moving frames 5, fundamentally solving the problem of excessively long changeover times in traditional equipment.

[0031] The following is a description of the drive mechanism 4: The drive mechanism 4 includes a drive motor (not shown in the figure) mounted on the frame 1. The output end of the drive motor is connected to the slitting roller 201. The slitting roller 201 and the lower slitting and cutting mechanism 3 are connected by a pulley assembly (including a drive pulley, a driven pulley and several guide pulleys, wherein the diameter ratio of the drive pulley to the driven pulley is 1:1 to ensure that the speed of the upper and lower slitting rollers is completely consistent) and a drive belt.

[0032] When the drive motor starts, its output torque is transmitted to the upper roller in sequence, and then through the meshing transmission of the pulley assembly and the transmission belt, it drives the lower roller of the lower slitting and cutting mechanism 3 to rotate in the opposite direction. Through this reverse synchronous rotation, in conjunction with the upper and lower biting blades, a continuous shearing force can be formed on the steel coil that is horizontally conveyed to the cutting area, and the wide steel coil can be accurately cut into narrow steel strips of a preset width.

[0033] The following describes how the movable frame 5 moves along the axial direction of the mounting plate 204: The slitting roller 201 has an internal cavity for installing other components. A threaded rod 7 is rotatably connected inside the slitting roller 201. The threaded rod 7 is coaxially arranged with the slitting roller 201, which lays the foundation for the smooth movement of the moving frame 5.

[0034] The threaded rod 7 is provided with threaded sections corresponding to each movable frame 5. Each movable frame 5 is threadedly connected to the corresponding threaded section. The slitting roller 201 is provided with clearance holes 8 for the movable frame 5 to move along the axial direction of the slitting roller 201, so as to ensure that the movable frame 5 only moves axially and does not rotate synchronously with the threaded rod 7.

[0035] It should be noted that the threaded segments corresponding to the two movable frames 5 located at both ends of the mounting plate 204 are denoted as threaded segment A and threaded segment B, respectively, and the thread directions of threaded segment A and threaded segment B are opposite. Therefore, when the threaded rod 7 rotates around its own axis, threaded segment A and threaded segment B will generate opposite axial forces on the two movable frames 5, thereby causing the two movable frames 5 to move closer to or further away from each other.

[0036] Considering that the threaded rod 7 and the slitting roller 201 are coaxially arranged, in order to prevent the slitting roller 201 from rotating when the threaded rod 7 rotates, an operating rod is rotatably connected to one end of the slitting roller 201. The axis of the operating rod is perpendicular to the axis of the slitting roller 201. One end of the operating rod extends into the slitting roller 201 and is connected to the threaded rod 7 through a reversing device. The reversing device consists of two meshing bevel gears. One bevel gear is fixed to the operating rod, and the other bevel gear is fixed to the threaded rod 7. It can convert the radial rotation of the operating rod (around an axis perpendicular to the axis of the slitting roller 201) into the axial rotation of the threaded rod 7 (around the axis of the slitting roller 201). Since the force applied by the operating rod is radial along the slitting roller 201, the slitting roller 201 is only subjected to a very small circumferential component force, which is much smaller than the driving force of the drive mechanism 4 to drive the slitting roller 201 to rotate. Therefore, rotating the operating rod will not drive the slitting roller 201 to rotate synchronously, and the position of the moving frame 5 can be flexibly adjusted when the machine is stopped.

[0037] The radial spreading and contracting mechanism 6 is described below: The radial unfolding mechanism 6 includes two connecting rods 601 radially distributed along the mounting plate 204 (the two rods are at an angle of 180° to ensure that the arc-shaped slitting blades 205 are subjected to balanced force, avoiding blade deviation due to uneven force during slitting). The ends of the two connecting rods 601 that are far apart from each other are fixedly connected to two oppositely arranged arc-shaped slitting blades 205, and the ends of the two connecting rods 601 that are close to each other are slidably connected to the moving frame 5. It should be noted that the four connecting rods 601 on both ends of the mounting plate 204 form a cross-shaped layout (90° circumferential interval), corresponding one-to-one with the four arc-shaped slitting blades 205 evenly distributed on the outer periphery of the mounting plate 204, precisely matching the blade distribution requirements.

[0038] A sliding column 602 is rotatably connected to the end of each connecting rod 601 near the movable frame 5, and the axis of each sliding column 602 is perpendicular to the axis of the mounting plate 204. A sliding groove 603 is fixed on the end face of the mounting plate 204, allowing each sliding column 602 to slide individually, and each sliding groove 603 extends along the moving direction of the movable frame 5. When the movable frame 5 moves axially along the slitting roller 201, the connecting rod 601 synchronously drives the sliding column 602 to slide smoothly within the sliding groove 603, achieving effective power transmission.

[0039] Specifically, the slide 603 includes a first inclined groove 6031 and a second inclined groove 6032 sequentially arranged along the moving direction of the movable frame 5. The first inclined groove 6031 and the second inclined groove 6032 cooperate to form a V-shaped structure. The first inclined groove 6031 is inclined towards the outer periphery of the mounting plate 204, and the second inclined groove 6032 is inclined towards the center of the mounting plate 204.

[0040] As the sliding column 602 slides sequentially along the first inclined groove 6031 and the second inclined groove 6032, that is, when the two moving frames 5 move away from each other axially (adapting to the switching action of 200mm large-size slitting), the corresponding arc-shaped slitting blade 205 first expands radially along the mounting plate 204 (the distance between adjacent arc-shaped slitting blades 205 increases, forming a safe clearance space), and then retracts radially along the mounting plate 204. This "expand first, then retract" motion trajectory, compared with the traditional slitting equipment design where "adjacent arc-shaped slitting blades 205 are directly axially offset," allows adjacent blades to form a safe distance in advance through the initial expansion action, fundamentally avoiding interference friction of the blade body or cutting edge during the retraction process, and significantly reducing the blade wear rate (tests have shown that it can extend the tool life by more than 30%).

[0041] Finally, when the moving frame 5 reaches the farthest limit position, the two oppositely arranged arc-shaped slitting blades 205 retract to one end face of the mounting plate 204, and the other two oppositely arranged arc-shaped slitting blades 205 retract to the other end face. The outer edges of all arc-shaped slitting blades 205 do not exceed the outer edge of the mounting plate 204, effectively avoiding interference with the steel coil or other parts of the equipment, ensuring the slitting stability when only the annular slitting blade 203 is used alone, and providing a reliable structural guarantee for the slitting of 200mm large-specification steel strips.

[0042] Working principle: When the equipment is in its initial state, the movable frame 5 is in the default "small specification slitting" initial position (i.e., the two movable frames 5 move closer to each other along the axial direction of the mounting plate 204 to the nearest limit position). At this time, the four arc-shaped slitting blades 205 form a complete annular cutting structure around the outer perimeter of the mounting plate 204. The equipment can then directly slit 100mm small specification steel strips. Figure 7 As shown.

[0043] To switch to 200mm large-size steel strip slitting, the operator rotates the operating lever, which in turn rotates the threaded rod 7 via the reversing device, causing the two moving frames 5 to move away from each other along the axial direction of the mounting plate 204. The moving frames 5 then slide the sliding column 602 along the sliding groove 603, pulling the connecting rod 601 radially outward from the mounting plate 204, ensuring a safe clearance between adjacent arc-shaped slitting blades 205 to avoid friction. Figure 8 As shown. Then, it retracts radially inward along the mounting plate 204, as... Figure 9 As shown. When the moving frame 5 moves to the limit position, the two sets of opposing arc-shaped slitting blades 205 retract to the two ends of the mounting plate 204, with only the annular slitting blade 203 retaining its cutting function. At this time, the drive mechanism 4 is activated, causing the upper and lower rollers to rotate in opposite directions. The wide steel coil enters the cutting area, and the shearing force is generated only by the interlocking annular slitting blades 203, cutting the steel coil into narrow steel strips with a spacing of 200mm.

[0044] Throughout the entire workflow, switching between the two specifications only requires adjusting the control lever (which takes a few minutes), eliminating the need for manual tool disassembly and replacement, thus solving the problem of time-consuming tool changeover in traditional equipment; at the same time, the "expand first, then retract" arc-shaped tool movement trajectory reduces tool wear and extends the service life of the equipment.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stable steel coil slitting machine, comprising a frame, characterized in that: The frame is provided with an upper slitting and lower slitting cutting mechanism at intervals along the vertical direction. A drive mechanism is installed on the frame to drive the upper slitting and lower slitting cutting mechanism to rotate in opposite directions. The upper slitting and cutting mechanism includes a slitting roller arranged in a horizontal direction, which is rotatably connected to the frame and driven by the drive mechanism; a number of fixed discs are fixed at equal intervals along the axial direction on the outer periphery of the slitting roller, and an annular slitting knife is fixed on the outer periphery of each fixed disc; a mounting disc is arranged between two adjacent fixed discs, and each mounting disc is fixed on the outer periphery of the slitting roller. Four arc-shaped slitting blades are evenly distributed along the circumference of the outer periphery of the mounting plate. Movable frames are provided at both ends of the mounting plate, and the two movable frames can move away from or towards each other along the axial direction of the mounting plate. Radial retraction mechanisms are connected between two oppositely arranged arc-shaped slitting blades and a movable frame, and between two other oppositely arranged arc-shaped slitting blades and another movable frame. The radial retraction mechanisms are used to drive the two oppositely arranged arc-shaped slitting blades to retract or expand radially along the mounting plate. When the two moving frames approach each other to the limit position, the four arc-shaped slitting blades are located on the outer periphery of the mounting plate and together form a ring-shaped cutting structure. When the two moving frames move away from each other to the limit position, the two oppositely positioned arc-shaped slitting blades retract to the end face of the mounting plate.

2. The stable steel coil slitting equipment according to claim 1, characterized in that: The cutting blades of the upper slitting and lower slitting mechanisms are vertically aligned and interlocked.

3. The stable steel coil slitting equipment according to claim 1, characterized in that: The drive mechanism includes a drive motor mounted on the frame, the output end of which is connected to the slitting roller, and the slitting roller is connected to the lower slitting and cutting mechanism via a pulley assembly and a drive belt.

4. The stable steel coil slitting equipment according to claim 1, characterized in that: The annular cutting structure is equidistant from the two adjacent annular slitting blades on the left and right.

5. A stable steel coil slitting device according to any one of claims 1-4, characterized in that: The slitting roller has a cavity inside, and a threaded rod is rotatably connected inside the slitting roller. The threaded rod is coaxially arranged with the slitting roller. The threaded rod is provided with threaded sections corresponding to each moving frame, and each moving frame is threadedly connected to the corresponding threaded section. The slitting roller is provided with clearance holes for the moving frames to move along the axial direction of the slitting roller.

6. The stable steel coil slitting equipment according to claim 5, characterized in that: An operating lever is rotatably connected to one end of the slitting roller. The axis of the operating lever is perpendicular to the axis of the slitting roller. One end of the operating lever extends into the slitting roller and is connected to a threaded rod via a reversing device.

7. The stable steel coil slitting equipment according to claim 1, characterized in that: The radial unfolding and unfolding mechanism includes two connecting rods radially distributed along the mounting plate. The ends of the two connecting rods that are far apart from each other are fixedly connected to two oppositely arranged arc-shaped slitting blades, and the ends of the two connecting rods that are close to each other are slidably connected to the moving frame.

8. A stable steel coil slitting device according to claim 7, characterized in that: Each connecting rod has a sliding column rotatably connected to one end near the movable frame, and the axis of each sliding column is perpendicular to the axis of the mounting plate. A sliding groove is fixed on the end face of the mounting plate for each sliding column to slide one by one, and each sliding groove extends along the moving direction of the moving frame.

9. A stable steel coil slitting device according to claim 8, characterized in that: The chute includes a first inclined chute and a second inclined chute arranged sequentially along the moving direction of the moving frame, and the first inclined chute and the second inclined chute cooperate to form a V-shaped structure. As the sliding column slides along the first and second inclined grooves in sequence, the corresponding arc-shaped slitting blade first expands radially along the mounting plate and then contracts radially along the mounting plate.

10. A stable steel coil slitting device according to claim 1, characterized in that: The outer diameter of the annular cutting structure is the same as the outer diameter of the annular slitting blade. When the curved slitting blade retracts to the end face of the mounting plate, the outer edge of the curved slitting blade does not extend beyond the outer edge of the mounting plate.

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