A cutting device for 3D printer
By designing a shearing device for 3D printers, using a conical hole structure and driving mechanism to achieve efficient shearing, the problems of high cost of shearing devices and degraded material performance in the prior art are solved, and printing accuracy and efficiency are improved.
Patent Information
- Application Number
- CN202510020334.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-04-04
AI Technical Summary
The shearing devices in existing 3D printers have high costs, reduced material performance, mechanical wear and damage to fibers, resulting in reduced printing accuracy and damaged material performance.
A shearing device including a shearing mechanism and a control mechanism is designed. The shearing mechanism consists of a first limiting block, a second limiting block, a cutting block, a blade and a base. A conical hole is provided on the blade, and the blade is driven to move through the drive mechanism to cut it.
It improves the shearing effect of 3D printing materials, improves printing accuracy and efficiency, and reduces equipment maintenance costs and impact on material performance.
Smart Images
Figure CN119748871A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of 3D printing equipment, and in particular to a shearing device for a 3D printer. Background Art
[0002] The tool head of a 3D printer is the core component that realizes the function of melting thermoplastic materials and accurately depositing them onto the printing platform to build a three-dimensional object layer by layer. Its performance and structural design play a decisive role in printing quality and efficiency. Common 3D printer tool heads are composed of multiple parts such as extrusion mechanism, heating end, nozzle, cooling system, temperature control system, motion system, shearing device, etc. Among them, the shearing device plays a vital role in the 3D printing process. When printing complex geometric shapes, changing material properties, or printing composite materials, it is responsible for cutting off and controlling the flow of molten materials, which plays an indispensable role in improving printing accuracy and reducing material drawing. Moreover, the design principle and scheme of the shearing device directly affect the performance of carbon fiber during the printing process.
[0003] At present, there are many types of shearing devices used in continuous carbon fiber 3D printers and corresponding problems. Although the laser shearing device has certain cutting capabilities, its manufacturing and maintenance costs are high, and high temperatures are generated during the cutting process. This high temperature environment may have an adverse effect on the properties of the base material around the fiber, thereby affecting the quality and performance of the final product. The thermal shearing device heats the continuous carbon fiber to a high temperature through a resistance wire or a heating coil to break it, but this method will cause the material performance to deteriorate, and the maintenance cost of the heating element is also high.
[0004] Commonly used mechanical shearing devices also have many disadvantages. In actual use, mechanical wear is an unavoidable problem. Long-term use will lead to a decrease in the accuracy of the device and affect the cutting effect. Moreover, during the cutting process, the mechanical shearing device is prone to damage the fiber, seriously affecting the performance of the material, making it difficult for the printed product quality to meet the ideal standard.
[0005] In addition, the shearing device control system of most 3D printer tool heads is located at the proximal end, which undoubtedly increases the mass of the tool head. The increase in the weight of the tool head will bring a series of negative effects. On the one hand, the larger weight will produce greater inertia during the movement of the print head, especially when moving quickly or changing direction. This inertia can easily cause vibration during printing, which greatly reduces the printing accuracy. On the other hand, a heavier tool head will significantly increase the load on the printer and drive motor, accelerate the wear and aging of mechanical parts, and greatly reduce the service life of the equipment.
[0006] At the same time, as the mass and components of the tool head increase, the flexibility of the tool nozzle will also be significantly affected. This reduction in flexibility has a number of adverse effects on the printing effect: First, in terms of material restrictions, the low-flexibility tool nozzle system is difficult to switch materials conveniently, which seriously limits the diversity and application scope of printing materials, and limits the application of 3D printing in different fields; second, in terms of printing complexity, the low-flexibility tool head is limited in its ability to handle complex geometric shapes and details, and cannot meet the growing demand for high-quality and diversified printed products; third, in terms of the trouble of changing the head, the inconvenience of changing the head will increase the time and difficulty of changing the tool nozzle, which directly leads to a decrease in printing efficiency. Summary of the invention
[0007] The purpose of the present invention is to provide a shearing device for a 3D printer to solve the problems existing in the above-mentioned prior art and improve the shearing effect of 3D printing materials.
[0008] To achieve the above object, the present invention provides the following solutions:
[0009] The present invention provides a shearing device for a 3D printer, comprising a shearing mechanism and a control mechanism, wherein the shearing mechanism comprises a first limit block, a second limit block, and a material lowering block, a blade and a base which are sequentially arranged from top to bottom, wherein the blade is arranged horizontally, the top surface of the blade is in sliding contact with the bottom surface of the material lowering block, and the bottom surface of the blade is in sliding contact with the top surface of the base; the first limit block, the blade and the second limit block are sequentially arranged along a first horizontal direction;
[0010] The blanking block is provided with a first blanking hole, the blade is provided with a conical hole, and the base is provided with a second blanking hole, the first blanking hole is coaxial with the second blanking hole, the diameter of the top opening of the conical hole is equal to the diameter of the bottom opening of the first blanking hole, the diameter of the bottom opening of the conical hole is equal to the diameter of the top opening of the second blanking hole, the top edge of the conical hole serves as a blade tip, and the generatrix length of the conical hole is greater than or equal to the diameter of the 3D printing material to be cut;
[0011] In the initial state, one end of the blade abuts against the side wall of the first limiting block, and the tapered hole, the first feed hole and the second feed hole are coaxial; in the shearing state, there is a gap between the blade and the first limiting block, and the width of the gap is equal to the diameter of the top opening of the tapered hole;
[0012] The control mechanism includes a driving mechanism and a reset mechanism, wherein the driving mechanism is used to drive the blade in the initial state to move a set distance relative to the base along the first horizontal direction toward the side away from the first limit block, and the set distance is equal to the diameter of the top opening of the conical hole; the reset mechanism is used to drive the blade in the shearing state to move the set distance relative to the base along the first horizontal direction toward the side close to the first limit block.
[0013] Preferably, the first limiting block and the second limiting block are respectively fixedly connected to the base.
[0014] Preferably, the first limiting block, the second limiting block and the base are integrally formed.
[0015] Preferably, the second discharge hole includes an inverted conical hole and a through hole distributed in sequence from top to bottom, the bottom end of the inverted conical hole is connected to the top end of the through hole, the diameter of the top opening of the inverted conical hole is equal to the diameter of the bottom opening of the conical hole, and the diameter of the bottom opening of the inverted conical hole, the diameter of the through hole and the diameter of the top opening of the conical hole are equal.
[0016] Preferably, the shearing mechanism is arranged on the tool head of the 3D printer.
[0017] Preferably, the driving mechanism includes a driving device, a winding drum, a wire core and a connecting tube, the driving device is fixedly connected to the main body of the 3D printer, the winding drum is fixedly connected to the output shaft of the driving device, the driving device is used to drive the winding drum to rotate, the wire core portion is wound on the winding drum, one end of the connecting tube is fixedly connected to the main body of the 3D printer, and the other end is fixedly connected to the tool head, the wire core portion passes through the connecting tube, and the free end of the wire core is fixedly connected to the blade.
[0018] Preferably, the connecting tube comprises a consumable tube, a spring tube and a Teflon hose which are sequentially sleeved from the inside to the outside, and the consumable tube is detachably connected to the spring tube.
[0019] Preferably, the material of the wire core is flexible high modulus fiber.
[0020] Preferably, the driving device adopts a steering gear.
[0021] Preferably, the reset mechanism adopts a reset spring, one end of which abuts against an end of the blade away from the first limit block, and the other end of which abuts against a side wall of the second limit block.
[0022] Compared with the prior art, the present invention has achieved the following technical effects:
[0023] The shearing device for a 3D printer provided by the present invention effectively solves the problems existing in the prior art by designing a shearing mechanism and a control mechanism, improves the shearing effect of 3D printing materials, enhances printing accuracy and efficiency, reduces equipment maintenance costs and the impact on material properties, and has good application prospects.
[0024] Furthermore, the shearing mechanism of the present invention comprises a first limit block, a second limit block, and a blanking block, a blade and a base which are sequentially distributed from top to bottom. When the blade is driven to move for shearing, the top end of the tapered hole on the blade cooperates with the bottom end of the first blanking hole on the blanking block to shear the 3D printing material. Moreover, due to the structural characteristics of the tapered hole, it has at least the following advantages:
[0025] ① Improve cutting efficiency: The inclined side wall of the tapered hole (i.e., the bevel blade) allows the blade to gradually enter the material during the cutting process, thereby reducing the instantaneous cutting resistance; the gradual entry makes the cutting smoother and reduces the force required during the cutting process; the bevel blade allows the printing consumables to be gradually separated during cutting, reducing the possibility of material deformation, breakage, and burrs, ensuring the accuracy and quality of the cutting;
[0026] ② Improve and maintain sharpness: The beveled blade is sharper than the flat blade. The bevel makes the tip of the blade thinner, making it easier to cut into the material, providing a cleaner and more precise cut. The bevel design can evenly distribute the wear during the cutting process, thereby maintaining the sharpness of the blade for a longer time.
[0027] ③ The beveled blade provides better control of the cutting direction; using a beveled blade makes it easier to control the cutting path, especially in fine cutting and engraving operations; at the same time, the beveled blade can better bite the material when cutting, reduce the possibility of blade slippage, and improve the safety and accuracy of cutting;
[0028] ④Uniform stress distribution The beveled blade can distribute stress more evenly during the cutting process, avoid stress concentration, reduce the risk of blade damage and breakage, and extend the service life of the blade;
[0029] ⑤The design of the beveled blade makes it suitable for a variety of different materials, from soft materials such as paper and plastic to hard materials such as metal and wood, providing a wider range of applications; the beveled blade is not only suitable for straight cutting, but also for curves and fine cutting, increasing the versatility of the blade.
[0030] Furthermore, the shearing mechanism in the present invention has a simple structure and the blade is easy to replace; the blade is arranged horizontally, and its top surface is in sliding contact with the bottom surface of the feed block, and the bottom surface is in sliding contact with the top surface of the base. This sliding connection method enables the blade to move smoothly during operation, ensuring the stability and accuracy of the shearing action, which is beneficial to improving the shearing effect and printing quality.
[0031] Furthermore, the first limit block, the blade and the second limit block are distributed in sequence along the first horizontal direction. This layout effectively limits the movement range of the blade, so that the position of the blade in the initial state and the shearing state can be accurately controlled, further ensuring the reliability and accuracy of the shearing operation.
[0032] Furthermore, a first feeding hole is set in the feeding block, a conical hole is set on the blade, and a second feeding hole is set on the base, and the three holes are coaxial. At the same time, the top opening diameter of the conical hole is equal to the bottom opening diameter of the first feeding hole, and the bottom opening diameter of the conical hole is equal to the top opening diameter of the second feeding hole. This design ensures that the 3D printing material can pass through these holes smoothly without clogging.
[0033] Furthermore, the top edge of the tapered hole serves as a blade tip, and the generatrix length of the tapered hole is greater than or equal to the diameter of the 3D printing material to be cut. This design enables the blade to use the blade tip at the top of the tapered hole to quickly cut the material when cutting the material, thereby ensuring the cutting effect and efficiency, while also avoiding excessive extrusion and damage to the material, which is beneficial to ensuring the performance of the printed material.
[0034] Furthermore, in the initial state, one end of the blade abuts against the side wall of the first limit block, and the tapered hole, the first feed hole and the second feed hole are coaxial. This state ensures the stability and continuity of the material during normal transportation; in the shearing state, there is a gap between the blade and the first limit block, and the width of the gap is equal to the diameter of the top opening of the tapered hole. This design enables the blade to accurately cut the material when moving to shear the material, and will not affect the shearing effect due to the gap being too large or too small, thereby improving the shearing accuracy and reliability.
[0035] Furthermore, the first limit block and the second limit block are respectively fixedly connected to the base. Preferably, the first limit block, the second limit block and the base are integrally formed. This connection method enhances the structural strength and stability of the entire shearing mechanism, reduces vibration and errors caused by loose connection between components, and is beneficial to improving the service life and working accuracy of the shearing device.
[0036] Furthermore, the second feeding hole includes an inverted tapered hole and a through hole distributed from top to bottom, the bottom of the inverted tapered hole is connected to the top of the through hole, the top opening diameter of the inverted tapered hole is equal to the bottom opening diameter of the tapered hole, and the bottom opening diameter of the inverted tapered hole, the diameter of the through hole and the top opening diameter of the tapered hole are equal. This design further optimizes the material feeding process, so that the cut material can pass through the second feeding hole smoothly, avoiding the accumulation and blockage of the material in the hole, and improving the smoothness of the printing process.
[0037] Furthermore, the shearing mechanism is arranged on the tool head of the 3D printer. This layout enables the shearing device to cut the printing material more directly and effectively, reduces interference and loss of the material during the transportation process, and improves the printing accuracy and efficiency.
[0038] Furthermore, the driving mechanism includes a driving device, a winding drum, a wire core and a connecting tube. The driving device is fixedly connected to the main body of the 3D printer, and the winding drum is fixedly connected to the output shaft of the driving device. The driving device drives the winding drum to rotate, and drives the blade to move through the wire core. This driving method has a simple structure and high transmission efficiency, and can accurately control the moving distance and speed of the blade, meeting the requirements of different printing materials and printing processes for cutting action.
[0039] Furthermore, the connecting tube includes a consumable tube, a spring tube and a Teflon hose which are sequentially sleeved from the inside to the outside, and the consumable tube and the spring tube are detachably connected. This multi-layered connecting tube not only ensures the smooth movement of the wire core, but also effectively protects it from being disturbed and damaged by the external environment. At the same time, the design of the detachable connection between the consumable tube and the spring tube facilitates the maintenance and replacement of the consumable tube when necessary, thereby reducing the cost of use. The spring tube is used to ensure the support of the connecting tube, and the Teflon hose is used to prevent the spring tube from being misaligned and causing the wire core to be entangled and blocked.
[0040] Furthermore, the material of the wire core is flexible high modulus fiber, which has good flexibility and high strength. While ensuring that the wire core can smoothly drive the blade to move, it will not affect the movement accuracy of the blade due to its own deformation, thereby ensuring the reliability and stability of the driving mechanism.
[0041] Furthermore, the driving device adopts a servo, which has the advantages of high control accuracy and fast response speed. It can accurately control the rotation angle and speed of the winding drum, thereby realizing precise control of the movement of the blade, meeting the high-precision requirements for cutting action in the 3D printing process.
[0042] Furthermore, the reset mechanism uses a reset spring, one end of which abuts against the end of the blade away from the first limit block, and the other end abuts against the side wall of the second limit block. This reset method is simple and reliable, and can quickly reset the blade to its initial state after the blade completes the shearing action, preparing for the next shearing operation, thereby improving the working efficiency and stability of the shearing device. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0044] Figure 1 It is a partial structural schematic diagram of a shearing device for a 3D printer of the present invention;
[0045] Figure 2 A schematic diagram of 3D printing material passing through the shearing mechanism of the present invention during the printing process;
[0046] Figure 3 A schematic diagram of the shearing mechanism of the present invention shearing off 3D printing materials;
[0047] Figure 4 It is a schematic diagram of the structure of the driving mechanism in the shearing device used for a 3D printer of the present invention;
[0048] Figure 5 It is a schematic structural diagram of a connecting tube in a shearing device for a 3D printer according to the present invention;
[0049] In the figure: 1. feed block; 2. first feed hole; 3. blade; 4. first limit block; 5. base; 6. second feed hole; 7. second limit block; 8. tapered hole; 9. return spring; 10. winding reel; 11. connecting tube; 111. consumable tube; 112. spring tube; 113. Teflon hose; 12. wire core; 13. tool head. DETAILED DESCRIPTION
[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0051] The purpose of the present invention is to provide a shearing device for a 3D printer to solve the problems existing in the above-mentioned prior art and improve the shearing effect of 3D printing materials.
[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0053] like Figures 1 to 5As shown, this embodiment provides a shearing device for a 3D printer, including a shearing mechanism and a control mechanism, the shearing mechanism includes a first limit block 4, a second limit block 7, and a material block 1, a blade 3 and a base 5 arranged in sequence from top to bottom, the blade 3 is arranged horizontally, the top surface of the blade 3 is in sliding contact with the bottom surface of the material block 1, and the bottom surface of the blade 3 is in sliding contact with the top surface of the base 5; the first limit block 4, the blade 3 and the second limit block 7 are arranged in sequence along the first horizontal direction;
[0054] A first blanking hole 2 is provided in the blanking block 1, a conical hole 8 is provided on the blade 3, and a second blanking hole 6 is provided on the base 5. The first blanking hole 2 is coaxial with the second blanking hole 6. The diameter of the top opening of the conical hole 8 is equal to the diameter of the bottom opening of the first blanking hole 2, and the diameter of the bottom opening of the conical hole 8 is equal to the diameter of the top opening of the second blanking hole 6. The top edge of the conical hole 8 serves as a blade tip, and the generatrix length of the conical hole 8 is greater than or equal to the diameter of the 3D printing material to be cut;
[0055] In the initial state, one end of the blade 3 abuts against the side wall of the first limit block 4, and the tapered hole 8, the first feed hole 2 and the second feed hole 6 are coaxial; in the shearing state, there is a gap between the blade 3 and the first limit block 4, and the width of the gap is equal to the diameter of the top opening of the tapered hole 8;
[0056] The control mechanism includes a driving mechanism and a reset mechanism. The driving mechanism is used to drive the blade 3 in the initial state to move a set distance relative to the base 5 along the first horizontal direction toward the side away from the first limit block 4, and the set distance is equal to the diameter of the top opening of the conical hole 8; the reset mechanism is used to drive the blade 3 in the shearing state to move a set distance relative to the base 5 along the first horizontal direction toward the side close to the first limit block 4.
[0057] The working principle of the shearing device for the 3D printer in this embodiment is as follows:
[0058] During normal printing, the 3D printing material passes through the first feed hole 2 of the feed block 1, the tapered hole 8 of the blade 3 and the second feed hole 6 of the base 5 in sequence. At this time, one end of the blade 3 abuts against the side wall of the first limit block 4, and the three holes are coaxial to ensure smooth material transportation; when the material needs to be sheared, the driving device fixedly connected to the 3D printer body drives the blade 3 to move along the first horizontal direction toward the side away from the first limit block 4 by a set distance equal to the opening diameter of the top end of the tapered hole 8, and uses the tip of the blade at the top of the tapered hole 8 to cut off the material; after the shearing is completed, the reset mechanism plays a role, and moves the blade 3 back to the initial position along the first horizontal direction toward the side close to the first limit block 4, and the sheared material is smoothly discharged through the second feed hole 6.
[0059] Specifically, the first limit block 4 and the second limit block 7 are respectively fixedly connected to the base 5. Preferably, the first limit block 4, the second limit block 7 and the base 5 are integrally formed. This connection method enhances the structural strength and stability of the entire shearing mechanism, reduces the vibration and error caused by loose connection between components, and is beneficial to improving the service life and working accuracy of the shearing device.
[0060] In the optional scheme of this embodiment, it is more preferred that the second feed hole 6 includes an inverted tapered hole 8 and a through hole distributed in sequence from top to bottom, the bottom end of the inverted tapered hole 8 is connected to the top end of the through hole, the diameter of the top opening of the inverted tapered hole 8 is equal to the diameter of the bottom opening of the tapered hole 8, and the diameter of the bottom opening of the inverted tapered hole 8, the diameter of the through hole and the diameter of the top opening of the tapered hole 8 are equal. This design further optimizes the material feeding process, so that the cut material can pass through the second feed hole 6 smoothly, avoiding the accumulation and blockage of the material in the hole, and improving the fluency of the printing process.
[0061] In the optional scheme of this embodiment, it is more preferred that the cutting mechanism is arranged on the tool head 13 of the 3D printer. This layout enables the cutting device to cut the printing material more directly and effectively, reduces the interference and loss of the material during the transportation process, and improves the printing accuracy and efficiency.
[0062] In the optional scheme of this embodiment, it is more preferred that the driving mechanism includes a driving device, a winding drum 10, a wire core 12 and a connecting tube 11, the driving device is fixedly connected to the main body of the 3D printer, the winding drum 10 is fixedly connected to the output shaft of the driving device, the driving device is used to drive the winding drum 10 to rotate, the wire core 12 is partially wound on the winding drum 10, one end of the connecting tube 11 is fixedly connected to the main body of the 3D printer, and the other end is fixedly connected to the tool head 13, the wire core 12 partially passes through the connecting tube 11, and the free end of the wire core 12 is fixedly connected to the blade 3; the driving device drives the winding drum 10 to rotate, and drives the blade 3 to move through the wire core 12. This driving method has a simple structure and high transmission efficiency, and can accurately control the moving distance and speed of the blade 3, meeting the requirements of different printing materials and printing processes for shearing action.
[0063] In the optional scheme of this embodiment, it is more preferred that the connecting tube 11 includes a consumable tube 111, a spring tube 112 and a Teflon hose 113 which are sequentially sleeved from the inside to the outside, and the consumable tube 111 and the spring tube 112 are detachably connected. The connecting tube 11 not only ensures the smooth movement of the wire core 12, but also effectively protects it from being disturbed and damaged by the external environment. At the same time, the design of the detachable connection between the consumable tube 111 and the spring tube 112 facilitates the maintenance and replacement of the consumable tube 111 when necessary, thereby reducing the cost of use. The spring tube 112 is used to ensure the support of the connecting tube 11, and the Teflon hose 113 is used to prevent the spring tube 112 from being misaligned and causing the wire core 12 to be entangled and blocked. The material of the consumable tube 111 is plastic.
[0064] In the optional scheme of this embodiment, it is more preferred that the material of the wire core 12 is flexible high modulus fiber. This material has good flexibility and high strength. It can ensure that the wire core 12 can smoothly drive the blade 3 to move while not affecting the movement accuracy of the blade 3 due to its own deformation, thereby ensuring the reliability and stability of the driving mechanism.
[0065] Among the optional schemes of this embodiment, it is more preferred that the driving device adopts a servo, which has the advantages of high control accuracy and fast response speed. It can accurately control the rotation angle and speed of the winding drum 10, thereby realizing precise control of the movement of the blade 3, and meeting the high-precision requirements for cutting action during 3D printing.
[0066] In the optional scheme of this embodiment, it is more preferred that the reset mechanism adopts a reset spring 9, one end of which abuts against the end of the blade 3 away from the first limit block 4, and the other end abuts against the side wall of the second limit block 7. This reset method is simple and reliable, and can quickly reset the blade 3 to the initial state after the blade 3 completes the shearing action, so as to prepare for the next shearing operation, thereby improving the working efficiency and stability of the shearing device.
[0067] It is worth noting that, in addition to the reset spring 9, other forms of reset mechanisms can also be used in practical applications, such as using an electric push rod, a cylinder, a magnetic attraction device, etc. to reset the blade 3.
[0068] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A shearing device for a 3D printer, characterized in that: The invention comprises a shearing mechanism and a control mechanism, wherein the shearing mechanism comprises a first limit block, a second limit block, and a material lowering block, a blade and a base which are sequentially arranged from top to bottom, the blade is arranged horizontally, the top surface of the blade is in sliding contact with the bottom surface of the material lowering block, and the bottom surface of the blade is in sliding contact with the top surface of the base; the first limit block, the blade and the second limit block are sequentially arranged along a first horizontal direction; The blanking block is provided with a first blanking hole, the blade is provided with a conical hole, and the base is provided with a second blanking hole, the first blanking hole is coaxial with the second blanking hole, the diameter of the top opening of the conical hole is equal to the diameter of the bottom opening of the first blanking hole, the diameter of the bottom opening of the conical hole is equal to the diameter of the top opening of the second blanking hole, the top edge of the conical hole serves as a blade tip, and the generatrix length of the conical hole is greater than or equal to the diameter of the 3D printing material to be cut; In the initial state, one end of the blade abuts against the side wall of the first limiting block, and the tapered hole, the first feed hole and the second feed hole are coaxial; in the shearing state, there is a gap between the blade and the first limiting block, and the width of the gap is equal to the diameter of the top opening of the tapered hole; The control mechanism includes a driving mechanism and a reset mechanism, wherein the driving mechanism is used to drive the blade in the initial state to move a set distance relative to the base along the first horizontal direction toward the side away from the first limit block, and the set distance is equal to the diameter of the top opening of the conical hole; the reset mechanism is used to drive the blade in the shearing state to move the set distance relative to the base along the first horizontal direction toward the side close to the first limit block.
2. The shearing device for a 3D printer according to claim 1, characterized in that: The first limiting block and the second limiting block are respectively fixedly connected to the base.
3. The shearing device for a 3D printer according to claim 2, characterized in that: The first limiting block, the second limiting block and the base are integrally formed.
4. The shearing device for a 3D printer according to claim 1, characterized in that: The second discharge hole includes an inverted conical hole and a through hole distributed in sequence from top to bottom, the bottom end of the inverted conical hole is connected to the top end of the through hole, the diameter of the top end opening of the inverted conical hole is equal to the diameter of the bottom end opening of the conical hole, and the diameter of the bottom end opening of the inverted conical hole, the diameter of the through hole and the diameter of the top end opening of the conical hole are equal.
5. The shearing device for a 3D printer according to claim 1, characterized in that: The shearing mechanism is arranged on the tool head of the 3D printer.
6. The shearing device for a 3D printer according to claim 5, characterized in that: The driving mechanism includes a driving device, a winding drum, a wire core and a connecting tube. The driving device is fixedly connected to the main body of the 3D printer, the winding drum is fixedly connected to the output shaft of the driving device, the driving device is used to drive the winding drum to rotate, the wire core portion is wound on the winding drum, one end of the connecting tube is fixedly connected to the main body of the 3D printer, and the other end is fixedly connected to the tool head, the wire core portion passes through the connecting tube, and the free end of the wire core is fixedly connected to the blade.
7. The shearing device for a 3D printer according to claim 6, characterized in that: The connecting tube comprises a consumable tube, a spring tube and a Teflon hose which are sequentially sleeved from the inside to the outside, and the consumable tube is detachably connected to the spring tube.
8. The shearing device for a 3D printer according to claim 6, characterized in that: The material of the wire core is flexible high modulus fiber.
9. The shearing device for a 3D printer according to claim 6, characterized in that: The driving device adopts a steering gear.
10. The shearing device for a 3D printer according to claim 1, characterized in that: The reset mechanism adopts a reset spring, one end of which abuts against an end of the blade away from the first limit block, and the other end of which abuts against the side wall of the second limit block.