An impact-resistant special-shaped flexible material cutting device

Abstract

The present invention relates to a cutting device for impact-resistant special-shaped flexible materials, aiming to solve the problems of low cutting accuracy, low cutting efficiency and unstable cutting caused by the fact that the cutting tool of the existing cutting device is vulnerable to aperiodic random impacts. It includes a frame, a stepping movement mechanism, a rotary tool mechanism, a shock-absorbing device, a tool holder, a driving plate, a tool shaft and a limiting plate. The tool holder is installed at the lower part of the shock-absorbing device and includes a rectangular block and a U-shaped frame arranged at the lower part of the rectangular block. Fixed outer magnetic rings are respectively arranged on the two side plates of the U-shaped frame; the driving plates are respectively attached to the outer sides of the two side plates, and a plurality of driving electromagnets are evenly distributed on the inner circumferential surfaces of the driving holes of the two driving plates; a blade is installed in the middle of the tool shaft, and fixed inner magnetic rings are sleeved on the tool shaft corresponding to the fixed outer magnetic rings one by one. The fixed inner magnetic rings and the fixed outer magnetic rings are arranged with opposite polarities to repel each other, and mover magnets are arranged on the tool shaft corresponding to each driving electromagnet in the two driving holes one by one. After the driving electromagnet is powered on, it drives the mover magnet to rotate.

Description

Technical Field

[0001] The present invention relates to a cutting device for impact-resistant special-shaped flexible materials. Background Art

[0002] Special-shaped flexible materials refer to flexible materials with uneven thickness, toughness, hardness, etc. at various parts. During high-efficiency cutting operations, materials with different toughness and hardness have different forms of acting forces on the cutting tool during the cutting operation. Especially when cutting uneven materials, the cutting tool will be subjected to non-periodic random impacts, which will greatly affect the cutting quality of high-efficiency cutting operations.

[0003] Therefore, there is an urgent need for a cutting device that can adapt to various special-shaped flexible materials and has stable, high-precision, and efficient cutting. Summary of the Invention

[0004] The purpose of the present invention is to provide a cutting device for impact-resistant special-shaped flexible materials, so as to solve the technical problems that the cutting tool is easily subjected to non-periodic random impacts when cutting special-shaped flexible materials by the existing cutting device, resulting in low cutting precision, low cutting efficiency, and unstable cutting.

[0005] The technical solution of the present invention is as follows:

[0006] The cutting device for impact-resistant special-shaped flexible materials includes:

[0007] A frame;

[0008] A stepping movement mechanism, installed on the frame, including an output end that can move in three mutually perpendicular directions of X, Y, and Z, and can drive the tool holder to freely displace according to a set program;

[0009] A rotary tool mechanism, suspended on the output end, including a bracket and a connecting shaft rotatably assembled on the bracket. The axis of the connecting shaft is vertically arranged, and a rotary tool driving mechanism for driving the connecting shaft to rotate around its axis is also installed on the bracket;

[0010] A shock absorption device, installed at the lower part of the connecting shaft, and the shock absorption device includes buffer structures arranged in three directions of X, Y, and Z;

[0011] A tool holder, installed at the lower part of the shock absorption device, including a rectangular block and a U-shaped frame arranged at the lower part of the rectangular block. The U-shaped frame includes two side plates arranged in parallel at intervals. Installation through holes are respectively arranged on the two side plates of the U-shaped frame, the two installation through holes are coaxially arranged, and fixed outer magnetic rings are installed in the installation through holes;

[0012] There are two drive plates, which are respectively attached to the outside of the two side plates. The two drive plates are respectively provided with drive holes, which are coaxially arranged with the mounting through hole. A plurality of drive electromagnets are evenly distributed on the inner circumference of the drive holes; as a drive device for the rotation of the blade, the blade shaft in the suspended state can be driven to rotate by magnetic force;

[0013] The knife shaft has a blade installed in the middle, and the knife shaft is inserted into the installation through hole and the driving hole. The knife shaft is sleeved with a fixed inner magnetic ring corresponding to the fixed outer magnetic ring. The fixed inner magnetic ring and the fixed outer magnetic ring are arranged with opposite polarities to repel each other. The knife shaft is provided with a mover magnet corresponding to each driving electromagnet in the two driving holes. When the driving electromagnet is energized, the mover magnet is driven to rotate.

[0014] The limit plate is used to limit the knife shaft in the axial direction to limit the axial displacement of the knife shaft.

[0015] Furthermore, the driving hole is a hexagonal hole, and a driving electromagnet is respectively arranged on the six sides of the driving hole. The cross-sections of the two sections on the knife shaft corresponding to the two driving holes are hexagonal, and a movable magnet is respectively arranged on the six sides of the hexagon.

[0016] Furthermore, the shock absorbing device includes a shock absorbing box, which has a rectangular shock absorbing cavity inside. The rectangular block is arranged in the shock absorbing cavity. The upper surface of the rectangular block is connected to the top wall of the shock absorbing cavity by a top compression spring. An upper permanent magnet is arranged on the lower surface of the rectangular block. A lower permanent magnet corresponding to the upper permanent magnet is arranged on the bottom wall of the shock absorbing cavity. The polarities of the opposite sides of the upper and lower permanent magnets are opposite to each other to provide repulsive forces to each other. A side compression spring is arranged between the side wall of the shock absorbing cavity and the corresponding side of the rectangular block.

[0017] Furthermore, an electromagnetic lock is installed at the bottom of the shock absorbing box, and an electromagnet is arranged inside the electromagnetic lock. The electromagnet is arranged close to the U-shaped frame to lock the shock absorbing box relative to the tool holder when shock absorption is not required. The electromagnetic lock is arranged so that it can determine whether to start the shock absorption device according to the usage scenario. When cutting uniform and stable materials, the shock absorption box can be disabled; when cutting non-uniform materials, the shock absorption device can be activated due to severe shaking.

[0018] Furthermore, the rotary cutter driving mechanism comprises a driving motor, a driving synchronous pulley, a synchronous belt and a driven synchronous pulley which are sequentially connected in transmission, and the driven synchronous pulley is fixed on the connecting shaft.

[0019] Furthermore, the stepping movement mechanism includes a synchronous belt transmission mechanism that can move along the X direction and a screw transmission mechanism that can move along the Y and Z directions respectively.

[0020] Further, a limiting plate is arranged between the driving plate and the corresponding side plate. An avoidance hole for the tool shaft to pass through is arranged on the limiting plate, and a limiting table is arranged on the tool shaft. The limiting plate restricts the axial movement of the tool shaft through the abutting fit between the hole edge of the avoidance hole and the limiting table.

[0021] Advantages of the present invention: When the anti-impact special-shaped flexible material cutting device of the present invention is in use, each driving electromagnet on the driving plate is started, so as to generate magnetic force and couple with each moving magnet on the tool shaft, and then drive the tool shaft to rotate along its axis, driving the blade to rotate to cut the material. When the blade generates non-periodic impacts due to the different toughness, strength, hardness, density, etc. of the cut material, the jump of the tool shaft gradually disappears due to the cancellation of the repulsive force between the fixed outer magnetic ring and the fixed inner magnetic ring. Moreover, the greater the impact received, the greater the repulsive force between the inner and outer magnetic rings, achieving the purpose of self-adaptive anti-impact load and ensuring the anti-impact performance of the blade. Furthermore, when the tool shaft deviates from the central position due to non-periodic impact, since its driving method is driven by a driving electromagnet, even if it deviates from the central position, it is still driven by the driving electromagnet, ensuring the relative stability of the driving, that is, effective driving can still be carried out under the conditions of large impact, large deformation, and deviation of the axis. In addition, after the stepping movement mechanism is started, the blade can be driven to freely move along the X, Y, and Z directions according to the set program. The cutting direction of the blade can be changed through the tool turning mechanism. When the stepping movement mechanism drives the blade to move, a large movement acceleration is generated during the acceleration and deceleration process, or when the tool is subjected to non-periodic random impacts due to cutting special-shaped flexible materials with different toughness, different strength, different thickness, and different hardness, the damping device can automatically play a role, and the jitter in the X, Y, and Z directions is eliminated by springs with respectively determined damping coefficients. Since the cutting tool itself operates in the low-frequency region during the cutting operation, most of the high-frequency jitters received are noise. The appropriate transfer function is set through the spring suspension system to suppress the jitter noise, achieve low-pass filtering of the mechanism, ensure the stability of the tool during high-speed operation, and isolate the large-inertia motion mechanism from the small-inertia tool end, which is beneficial to achieving high-stability processing. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of the specific embodiment of the anti-impact special-shaped flexible material cutting device of the present invention;

[0023] Figure 2 It is a three-dimensional structure diagram of the tool turning mechanism and the damping device;

[0024] Figure 3 It is Figure 2 front view;

[0025] Figure 4 It is Figure 2 right view;

[0026] Figure 5 is Figure 3 a sectional view taken along line A-A in

[0027] Figure 6 is Figure 4 a sectional view taken along line B-B in

[0028] In the figure: 1-frame, 2-step moving mechanism, 21-X-direction synchronous belt drive mechanism, 22-Y-direction lead screw drive mechanism, 23-Z-direction lead screw drive mechanism, 231-output slider (i.e., output end); 3-rotary tool mechanism, 31-bracket, 32-connecting shaft, 33-driving motor, 34-driving synchronous pulley, 35-synchronous belt, 36-driven synchronous pulley, 4-damping device, 41-damping box, 410-removable enclosing plate, 42-tool rest, 421-rectangular block, 422-U-shaped frame, 4221-side plate, 43-top compression spring, 44-upper permanent magnet, 45-lower permanent magnet, 46-side compression spring, 5-blade, 7-abnormal flexible material to be cut, 8-flexible cutting panel, 9-electromagnetic lock, 10-driving plate, 20-limiting plate, 30-driving electromagnet, 40-moving magnet, 50-tool shaft, 60-fixed outer magnetic ring, 70-fixed inner magnetic ring. Specific embodiments

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings below is not intended to limit the scope of the claimed present invention, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0031] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0032] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0033] An embodiment of a cutting device for an impact-resistant special-shaped flexible material of the present invention: As Figure 1 shown, in order to eliminate the problem of tool operation jitter during the cutting operation process, the proposed impact-resistant special-shaped flexible material cutting device includes a frame 1, a stepping movement mechanism 2, a rotary tool mechanism 3, a shock absorption device 4, a tool holder 42, a drive plate 10, a tool shaft 50, a limit plate 20, a controller, a blade 5, a tool drive mechanism, etc.

[0034] The frame 1 is a steel structure welded frame, which is rectangular as a whole.

[0035] The stepping movement mechanism 2 is installed on the frame 1 and includes an X-direction synchronous belt drive mechanism 21 that can move along the X direction, and a Y-direction lead screw drive mechanism 22 and a Z-direction lead screw drive mechanism 23 that can move along the Y and Z directions respectively. The Z-direction lead screw drive mechanism 23 includes an output end that can move along three mutually perpendicular directions of X, Y, and Z, that is, an output slider 231. That is, above the X-direction synchronous belt drive mechanism 21 on the frame 1 of the cuboid frame structure, a Y-direction lead screw drive mechanism 22 for realizing Y-direction movement is laid, and on the Y-direction lead screw drive mechanism 22, a Z-direction lead screw drive mechanism 23 for realizing Z-direction movement is installed.

[0036] The knife rotating mechanism 3 is suspended on the output slider 231, and includes a bracket 31 and a connecting shaft 32 rotatably assembled on the bracket 31, the axis of the connecting shaft 32 is vertically arranged, and a knife rotating driving mechanism for driving the connecting shaft 32 to rotate around its axis is also installed on the bracket 31, and the knife rotating driving mechanism includes a driving motor 33, a driving synchronous pulley 34, a synchronous belt and a driven synchronous pulley 36 which are sequentially connected in transmission, and the driven synchronous pulley 36 is fixed on the connecting shaft 32. One end of the long arm-shaped bracket 31 is fixed on the Z-direction screw transmission mechanism 23, and a driving motor 33 is fixed in a fixing hole near the fixed end, and the motor shaft of the driving motor 33 is fixedly connected to the driving synchronous pulley 34, and is connected to the driven synchronous pulley 36 fixed to the outer end of the bracket 31 through a synchronous belt to transmit power.

[0037] The shock absorbing device 4 includes a shock absorbing box 41 fixed to the lower end of the connecting shaft 32, and the shock absorbing box 41 has a rectangular shock absorbing cavity. The shock absorbing device 4 also includes a tool holder 42, and the tool holder 42 includes a rectangular block 421 arranged in the shock absorbing cavity and a U-shaped frame 422 arranged at the lower part of the rectangular block 421. The U-shaped frame 422 is used to install the blade 5 and the tool driving mechanism that drives the blade 5 to rotate. The upper surface of the rectangular block 421 is connected to the top wall of the shock absorbing cavity through a top compression spring 43. An upper permanent magnet 44 is arranged on the lower surface of the rectangular block 421. A lower permanent magnet 45 corresponding to the upper permanent magnet 44 is arranged on the bottom wall of the shock absorbing cavity. The upper and lower permanent magnets 45 have opposite polarities on opposite sides to provide repulsive forces to each other. A side compression spring 46 is arranged between the side wall of the shock absorbing cavity and the side corresponding to the rectangular block 421. The U-shaped frame includes two side plates 4221 arranged in parallel at intervals, and the two side plates 4221 of the U-shaped frame are respectively provided with mounting through holes, the two mounting through holes are coaxially arranged, and a fixed external magnetic ring 60 is installed in the mounting through holes. The shock absorbing box 41 includes upper, lower, left, right, front and rear panels, and at least one of the left, right, front and rear panels is detachably connected to the other panels.

[0038] There are two driving plates 10, which are respectively attached to the outsides of two side plates 4221. Driving holes are respectively provided on the two driving plates 10. The two driving holes are coaxially arranged with the mounting through holes. A plurality of driving electromagnets 30 are evenly distributed on the inner circumferential surfaces of the driving holes. A blade 5 is installed in the middle of the tool shaft 50. The tool shaft 50 is inserted through the mounting through holes and the driving holes. Fixed inner magnetic rings 70 are sleeved on the tool shaft 50 corresponding to the fixed outer magnetic rings 60 one by one. The fixed inner magnetic rings 70 and the fixed outer magnetic rings 60 are arranged with opposite polarities to repel each other. Rotor magnets 40 are arranged on the tool shaft 50 corresponding to each driving electromagnet 30 in the two driving holes one by one. After the driving electromagnet 30 is powered on, it drives the rotor magnet 40 to rotate. The limiting plate 20 is used to axially limit the tool shaft 50 to limit the axial displacement of the tool shaft 50. The limiting plate 20 is arranged between the driving plate 10 and the corresponding side plate 4221. An avoidance hole for the tool shaft 50 to pass through is provided on the limiting plate 20. A limiting platform is provided on the tool shaft 50. The limiting plate 20 limits the axial movement of the tool shaft 50 through the abutting cooperation between the hole edge of the avoidance hole and the limiting platform. The driving hole is a hexagonal hole. One of the driving electromagnets 30 is provided on each of the six side surfaces of the driving hole. The cross-sections of two sections of the tool shaft 50 corresponding to the two driving holes are hexagonal. One rotor magnet 40 is provided on each of the six side surfaces of the hexagon. An electromagnetic lock 9 is installed at the lower part of the shock absorption box. An electromagnet is arranged inside the electromagnetic lock 9. The electromagnet is arranged close to the U-shaped frame to relatively lock the shock absorption box with respect to the tool rest when shock absorption is not required.

[0039] The to-be-cut special-shaped flexible material 7 is placed on the cuboid flexible cutting panel 8. The flexible cutting panel 8 is placed on the fixed body of the X-direction synchronous belt transmission mechanism 21.

[0040] The driven synchronous pulley 36 is fixedly connected to the connecting shaft 32 and is coaxially connected to the through hole at the distal end of the bracket 31. The end surface at the lower end of the connecting shaft 32 is fixed at the center of the upper part of the rectangular shock absorption box 41. A T-shaped groove, that is, a shock absorption cavity, is opened inside the shock absorption box 41. The inside is connected to the T-shaped tool rest 42 through shock absorption springs above and on all sides (that is, the top compression spring 43 and the side compression spring 46). Suspension control magnets (that is, the upper permanent magnet 44) are symmetrically fixed on the outer sides of the lower surfaces of the two sides of the rectangular block 421. And at the corresponding positions, suspension control magnets with opposite polarities (that is, the lower permanent magnet 45) are fixedly installed below the inner side of the shock absorption box 41. Its cooperation with the shock absorption spring fixed above realizes the suspension positioning in the Z direction, and the shock absorption springs symmetrically arranged in the X direction realize the suspension positioning in the X direction. Similarly, the shock absorption springs symmetrically arranged in the Y direction realize the suspension positioning in the Y direction.

[0041] The lower elongated side plates of the T-shaped tool holder 42 (i.e., the U-shaped frame 422) are symmetrically distributed, with coaxial through holes in the Y direction, in which the outer magnetic ring of the tool shaft 50 is fixed. The inner magnetic ring of the tool is fixedly installed at the center of the outer magnetic rings of the tool shafts 50 on both sides, with its polarity opposite to that of the outer magnetic ring of the tool. And the inner magnetic ring of the tool is fixed to the tool shaft 50. A cutting blade 5 is fixed at the center of the tool shaft 50. Therefore, the cutting blade 5 and the inner magnetic ring of the tool are fixedly connected through the tool shaft 50, and its radial non-contact positioning is realized through the outer magnetic ring of the tool, showing a non-linear load in the Z-direction load-bearing. That is, the greater the impact on the tool, the stronger the dynamic bearing capacity of the cutting blade 5 by the tool holder 42 and the greater the movement resistance, ensuring the anti-impact performance in the Z direction. On both outer sides of the fixed through holes at the lower end of the tool holder 42 in the axial direction of the tool shaft 50, limiting plates 20 are symmetrically fixed to realize the axial positioning of the tool shaft 50.

[0042] Both ends of the cylindrical tool shaft 50 are of hexagonal structure, and a circle of 6 mover magnets 40 are fixedly installed in a circumferential array on each side surface, corresponding one by one to the drive electromagnets 30 fixed on the hexagonal surfaces in the corresponding hexagonal slots of the drive plate 10. When an alternating current is applied, the drive electromagnets 30 fixed on the drive plate 10 drive the tool shaft to achieve non-contact rotational motion, and a certain redundancy of the center deviation of the motion axis is left, ensuring effective drive even in the case of large impact, large deformation and off-axis. The drive plate 10 is fixedly connected to the T-shaped tool holder 42.

[0043] On both sides in the Y direction of the lower surface of the shock-absorbing box 41, 2 rectangular plate-shaped electromagnetic locks 9 are fixedly installed, with electromagnets symmetrically arranged inside, having a certain gap with the drive plate 10. When the suspension system does not need to work, the drive electromagnetic locks 9 can be adsorbed and fixed to the drive plate 10, and the drive plate 10 is fixedly connected to the tool holder 42. That is, the fixed positioning between the shock-absorbing box 41 and the tool holder 42 is realized, making the suspension ineffective. A through hole for the U-shaped frame 422 to pass through is provided on the lower plate. The tool drive mechanism includes drive electromagnets 30 and mover magnets 40.

[0044] When the anti - impact special - shaped flexible material cutting device of the present invention is in use, each driving electromagnet 30 on the driving plate 10 is started, generating magnetic force to couple with each mover magnet 40 on the tool shaft 50, and then driving the tool shaft 50 to rotate along its axis, driving the blade 5 to rotate to cut the material. When the blade 5 is subjected to non - periodic impacts due to the different toughness, strength, hardness, density, etc. of the material being cut, the run - out of the tool shaft 50 gradually disappears by the cancellation of the repulsive force between the fixed outer magnetic ring 60 and the fixed inner magnetic ring 70. Moreover, the greater the impact received, the greater the repulsive force between the inner and outer magnetic rings, achieving the purpose of self - adapting to anti - impact loads and ensuring the anti - impact performance of the blade 5. Furthermore, when the tool shaft 50 deviates from the central position due to non - periodic impacts, since its driving method is driven by the driving electromagnet 30, even if it deviates from the central position, it is still driven by the driving electromagnet 30, ensuring the relative stability of the drive, that is, effective drive can still be carried out under the conditions of large impact, large deformation, and axis deviation. In addition, after starting the stepping movement mechanism, the blade 5 can be driven to move freely in the X, Y, and Z directions according to the set program. The cutting direction of the blade 5 can be changed through the tool - rotating mechanism. When the stepping movement mechanism drives the blade 5 to move, a large motion acceleration is generated during the acceleration and deceleration process, or when the tool is subjected to non - periodic random impacts due to cutting special - shaped flexible materials with different toughness, different strength, different thickness, and different hardness, the shock - absorbing device can automatically play a role, eliminating the jitter in the X, Y, and Z directions through springs with respectively determined damping coefficients. Since the cutting tool itself operates in the low - frequency region during the cutting operation, most of the high - frequency jitters received are noise. By setting an appropriate transfer function through the spring suspension system, jitter noise suppression is achieved, realizing low - pass filtering of the mechanism, ensuring the stability of the tool during high - speed operation, and realizing the isolation between the large - inertia motion mechanism and the small - inertia tool end, which is beneficial to achieving high - stability processing.

[0045] The above - mentioned are only the preferred embodiments of the present invention, and are not used to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the content of the specification and drawings of the present invention should, by the same token, be included in the protection scope of the present invention.

Claims

1. Impact-resistant special-shaped flexible material cutting device, characterized in that, include: frame; The stepping moving mechanism is mounted on the frame and includes an output end that can move in three mutually perpendicular directions: X, Y, and Z; The rotary cutter mechanism is suspended on the output end and comprises a bracket and a connecting shaft rotatably mounted on the bracket, the axis of the connecting shaft is vertically arranged, and a rotary cutter driving mechanism for driving the connecting shaft to rotate around its axis is also mounted on the bracket; A shock absorbing device is installed at the lower part of the connecting shaft, and the shock absorbing device includes a buffer structure arranged along three directions of X, Y and Z; The tool holder is installed at the lower part of the shock absorbing device, and includes a rectangular block and a U-shaped frame arranged at the lower part of the rectangular block, the U-shaped frame includes two side plates arranged in parallel at an interval, and the two side plates of the U-shaped frame are respectively provided with mounting through holes, the two mounting through holes are coaxially arranged, and a fixed external magnetic ring is installed in the mounting through hole; There are two drive plates, which are respectively attached to the outside of the two side plates. The two drive plates are respectively provided with drive holes, which are coaxially arranged with the mounting through holes, and a plurality of drive electromagnets are evenly distributed on the inner circumference of the drive holes; The knife shaft has a blade installed in the middle, and the knife shaft is inserted into the installation through hole and the driving hole. The knife shaft is sleeved with a fixed inner magnetic ring corresponding to the fixed outer magnetic ring. The fixed inner magnetic ring and the fixed outer magnetic ring are arranged with opposite polarities to repel each other. The knife shaft is provided with a mover magnet corresponding to each driving electromagnet in the two driving holes. When the driving electromagnet is energized, the mover magnet is driven to rotate. The limit plate is used to limit the knife shaft in the axial direction to limit the axial displacement of the knife shaft.

2. The impact-resistant special-shaped flexible material cutting device according to claim 1, characterized in that, The driving hole is a hexagonal hole, and a driving electromagnet is respectively arranged on the six sides of the driving hole. The cross-sections of the two sections on the knife shaft corresponding to the two driving holes are hexagonal, and a mover magnet is respectively arranged on the six sides of the hexagon.

3. The impact-resistant special-shaped flexible material cutting device according to claim 1, characterized in that, The shock absorbing device includes a shock absorbing box, which has a rectangular shock absorbing cavity inside. The rectangular block is arranged in the shock absorbing cavity. The upper surface of the rectangular block is connected to the top wall of the shock absorbing cavity by a top compression spring. An upper permanent magnet is arranged on the lower surface of the rectangular block. A lower permanent magnet corresponding to the upper permanent magnet is arranged on the bottom wall of the shock absorbing cavity. The polarities of the opposite sides of the upper and lower permanent magnets are opposite to each other to provide repulsive forces to each other. A side compression spring is arranged between the side wall of the shock absorbing cavity and the side surface corresponding to the rectangular block.

4. The impact-resistant special-shaped flexible material cutting device according to claim 3, characterized in that, An electromagnetic lock is installed at the lower part of the shock absorbing box. An electromagnet is arranged inside the electromagnetic lock. The electromagnet is arranged close to the U-shaped frame to lock the shock absorbing box relative to the tool holder when shock absorption is not required.

5. The impact-resistant special-shaped flexible material cutting device according to claim 1, characterized in that, The rotary cutter driving mechanism comprises a driving motor, a driving synchronous belt wheel, a synchronous belt and a driven synchronous belt wheel which are sequentially connected in transmission, and the driven synchronous belt wheel is fixed on the connecting shaft.

6. The impact-resistant special-shaped flexible material cutting device according to claim 1, characterized in that, The stepping moving mechanism comprises a synchronous belt transmission mechanism which can move along the X direction and a screw transmission mechanism which can move along the Y and Z directions respectively.

7. The impact-resistant special-shaped flexible material cutting device according to claim 1, characterized in that, The limit plate is arranged between the driving plate and the corresponding side plate. The limit plate is provided with an avoidance hole for the knife shaft to pass through. The knife shaft is provided with a limit platform. The limit plate cooperates with the stopper of the limit platform along the hole of the avoidance hole to limit the axial movement of the knife shaft.

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