A fiber filament shearing device for continuous fiber reinforced composite 3D printing

Abstract

The utility model provides a kind of continuous fiber reinforced composite 3D printing's fiber silk cutting device. Continuous fiber reinforced composite 3D printing's fiber silk cutting device includes print head body, the bottom of print head body is fixed with metal throat pipe, the surface of metal throat pipe is sleeved with telescopic radiating fin body, the surface of metal throat pipe is equipped with several scales, and the surface of metal throat pipe is equipped with nut for adjusting the length of radiating fin body, the continuous fiber reinforced composite 3D printing's fiber silk cutting device provided by the utility model, by setting several scales on the surface of metal throat pipe and the nut for adjusting the length of radiating fin body, flexible adjustment of the length of telescopic radiating fin body is realized, suitable for the surface of print head under different printing tasks and environmental temperature, carries out heat dissipation treatment.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing, and in particular to a fiber cutting device for 3D printing of continuous fiber reinforced composite materials. Background Technology

[0002] In the field of continuous fiber reinforced composite material 3D printing technology, the print head is a core component, and its performance and stability play a crucial role in the printing quality. During the printing process, the print head generates a lot of heat. If this heat cannot be dissipated in a timely and effective manner, it will cause the internal temperature of the print head to rise, thereby affecting the melting and extrusion of the material. In severe cases, it may even damage the print head and reduce its service life.

[0003] Currently, existing print heads in continuous fiber reinforced composite 3D printing fiber cutting devices have several shortcomings in terms of heat dissipation. On the one hand, while some print heads are equipped with heat dissipation structures, the length of the heat dissipation fins is fixed and cannot be flexibly adjusted according to actual printing conditions. The heat generated by the print head varies under different printing tasks and ambient temperatures, and the fixed fin length is insufficient to meet diverse heat dissipation needs. When the printing task is heavy and generates a lot of heat, the heat dissipation fins may be too short to dissipate heat in time, leading to excessively high print head temperatures. Conversely, when the printing task is light and generates less heat, excessively long heat dissipation fins may cause unnecessary energy waste and increase energy consumption.

[0004] On the other hand, existing methods for installing and adjusting heat sink fins are not convenient or precise enough. Some heat sink fins require complex tools and procedures for installation, which not only increases the difficulty and time cost of installation but also easily leads to insecure installation, affecting the heat dissipation effect. Moreover, when adjusting the length of heat sink fins, there is a lack of precise indicators and positioning structures, making it difficult for operators to accurately adjust the heat sink fins to the appropriate length, thus affecting the stability and consistency of heat dissipation performance.

[0005] Therefore, it is necessary to provide a new fiber cutting device for 3D printing of continuous fiber reinforced composite materials to solve the above-mentioned technical problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a fiber cutting device for 3D printing of continuous fiber reinforced composite materials.

[0007] The fiber cutting device for continuous fiber reinforced composite material 3D printing provided by this utility model includes: a print head body, a metal throat tube fixed at the bottom of the print head body, a telescopic heat dissipation fin body sleeved on the surface of the metal throat tube, a number of scales on the surface of the metal throat tube, and a nut for adjusting the length of the heat dissipation fin body on the surface of the metal throat tube.

[0008] Preferably, the telescopic heat dissipation fin body includes a heat dissipation cylinder and heat dissipation fins. One end of the heat dissipation cylinder is fixedly connected to one end of the heat dissipation fins, and both the heat dissipation cylinder and the heat dissipation fins are sleeved on the surface of the metal throat tube. The heat dissipation fins are located below the heat dissipation cylinder. The metal throat tube has a thread at two-thirds of its length, and the nut is threaded to the surface of the metal throat tube through the thread.

[0009] Preferably, the inner wall of the heat sink is provided with a graphite layer.

[0010] Preferably, several of the scales are sequentially formed on the surface of the first thread from top to bottom, for adjusting the sleeve position of the heat dissipation fins.

[0011] Preferably, the printhead body includes a quick-release adapter frame, the top of which has a feed port for carbon fiber to pass through, and an observation port is provided on one side of the quick-release adapter frame.

[0012] Preferably, a motor is fixed on the side of the quick-release adapter away from the observation port, a cutter is fixed on the rotor of the motor, a cutter cylinder is sleeved on the outside of the cutter, one end of the cutter cylinder is fixedly connected to the surface of the motor, and both the cutter cylinder and the cutter are located inside the quick-release adapter.

[0013] Preferably, the surface of the cutter barrel is provided with a second feed inlet, and the second feed inlet is coaxially arranged with the first feed inlet.

[0014] Preferably, the top of the heat sink is recessed inward to form a third inlet, the third inlet is located below the second inlet, and the third inlet, the second inlet and the first inlet are coaxially arranged from bottom to top.

[0015] Preferably, a fan is fixed to one side of the quick-release adapter, and the fan is located on one side of the metal throat.

[0016] Preferably, the bottom of the metal throat is provided with a heating component for heating the carbon fiber;

[0017] The heating assembly includes a heating block, a heating rod, and a thermocouple. The heating block is fixed to the bottom of the quick-release adapter. The heating rod and the thermocouple are respectively embedded in the heating block. One end of the metal throat passes through the center of the top of the heating block and extends into the interior of the heating block.

[0018] Compared with related technologies, the fiber cutting device for continuous fiber reinforced composite material 3D printing provided by this utility model has the following beneficial effects:

[0019] 1. This utility model achieves flexible adjustment of the length of the telescopic heat dissipation fins by setting several graduations on the surface of the metal throat and using nuts for adjusting the length of the heat dissipation fins. Under different printing tasks and ambient temperatures, operators can adjust the length of the heat dissipation fins to a suitable length according to the actual heat generated. When the printing task is heavy and generates a lot of heat, the heat dissipation fins can be lengthened to increase the heat dissipation area and dissipate heat in a timely and effective manner, avoiding excessively high printhead temperature, ensuring the melting and extrusion effect of the material, and improving print quality. When the printing task is light and generates less heat, the heat dissipation fins can be shortened to reduce unnecessary energy waste and lower energy consumption. This achieves precise heat dissipation adaptation and significantly improves heat dissipation efficiency.

[0020] 2. This utility model has several graduations on the surface of the metal throat tube, which allows the operator to accurately adjust the heat dissipation fins to the required length. This avoids the problem of inaccurate adjustment caused by the lack of adjustment for the extension length, and enables the print head to maintain good heat dissipation under different working conditions. This further improves the reliability and service life of the print head and reduces print head damage and maintenance costs caused by heat dissipation problems. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of the fiber cutting device for 3D printing of continuous fiber reinforced composite materials provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of feed inlet one;

[0023] Figure 3 A schematic diagram of the fiber cutting device for 3D printing of continuous fiber reinforced composite materials provided by this utility model;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the heat sink fin body;

[0025] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0026] The following are the labels in the diagram: 1. Quick-release adapter frame; 11. Feed port one; 12. Observation port; 2. Motor; 21. Cutter barrel; 211. Feed port two; 22. Cutter; 23. Heat sink; 231. Feed port three; 232. Graphite layer; 233. Heat sink fins; 24. Metal throat; 241. Thread one; 242. Scale; 25. Nut; 3. Fan; 4. Heating block; 41. Heating rod; 42. Thermocouple. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Please refer to the following: Figures 1 to 5 ,in, Figure 1 A schematic diagram of the overall structure of the fiber cutting device for 3D printing of continuous fiber reinforced composite materials provided by this utility model; Figure 2 This is a schematic diagram of the structure of feed inlet one; Figure 3 A schematic diagram of the fiber cutting device for 3D printing of continuous fiber reinforced composite materials provided by this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the heat sink fin body; Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0029] In some embodiments, such as Figures 1 to 5 As shown, it includes a printhead body, a metal throat 24 fixed at the bottom of the printhead body, a telescopic heat dissipation fin body sleeved on the surface of the metal throat 24, a number of scales 242 on the surface of the metal throat 24, and a nut 25 for adjusting the length of the heat dissipation fin body on the surface of the metal throat 24.

[0030] The telescopic heat sink body includes a heat sink cylinder 23 and heat sink fins 233. One end of the heat sink cylinder 23 is fixedly connected to one end of the heat sink fins 233. Both the heat sink cylinder 23 and the heat sink fins 233 are sleeved on the surface of the metal throat tube 24. The heat sink fins 233 are located below the heat sink cylinder 23. The metal throat tube 24 has a thread 241 formed at two-thirds of its length. The nut 25 is threaded to the surface of the metal throat tube 24 through the thread 241.

[0031] The heat sink 23 is made of rubber or silicone, which has a certain degree of flexibility and facilitates the adjustment of the length of the heat sink fins. That is, when the heat sink fins are adjusted, the heat sink 23 deforms and shrinks.

[0032] Specifically, during use, by tightening nut 25, nut 25 is threadedly connected to thread 241 on the surface of metal throat tube 24. When it is necessary to adjust the length of the heat dissipation fin body, if the printing task is heavy and a lot of heat is generated, the operator tightens nut 25 clockwise. Nut 25 moves upward along thread 241. Due to the interaction between nut 25 and the end of heat dissipation cylinder 23, it will push heat dissipation cylinder 23 and heat dissipation fins 233 to move upward as a whole. At this time, heat dissipation cylinder 23 deforms and contracts to adapt to the change in length. The length of heat dissipation fins 233 extending out of metal throat tube 24 increases, thereby increasing the heat dissipation area and dissipating heat more quickly, avoiding excessive printhead temperature.

[0033] Conversely, when the printing task is light and generates less heat, the operator turns the nut 25 counterclockwise. The nut 25 moves downward along the thread 241, and the heat sink 23 moves downward as a whole under its own elasticity. The length of the heat sink fins 233 extending out of the metal throat 24 is reduced, which reduces unnecessary energy waste and lowers energy consumption.

[0034] In addition, the surface of the metal throat tube 24 is provided with several scales 242, which are used to adjust the length of the heat dissipation fin body. Operators can accurately adjust the heat dissipation fin body to the required length according to the scales 242, thereby improving printing quality and the service life of the print head.

[0035] In some embodiments, such as Figures 3 to 5 As shown, the inner wall of the heat sink 23 is provided with a graphite layer 232;

[0036] Specifically, the graphite layer 232 has a certain degree of flexibility and good thermal conductivity. In practical applications, coating and fixing the graphite layer into the inner wall of the heat sink 23 can significantly improve its thermal conductivity.

[0037] In some embodiments, such as Figures 3 to 5 As shown, several scales 242 are sequentially opened on the surface of thread 241 from top to bottom, used to adjust the sleeve position of heat dissipation fins 233.

[0038] The heat dissipation fins 233 are preferably made of copper and are arranged in a spiral pattern to increase the contact area between the heat dissipation fins 233 and the air.

[0039] Specifically, when the operator adjusts the position of the heat dissipation fins 233 by turning the nut 25, the heat dissipation fins 233 can be adjusted to the required length according to the scale 242. For example, when the heat dissipation fins 233 need to extend a certain length to achieve the best heat dissipation effect, the operator can refer to the scale 242 and turn the nut 25 to the corresponding scale 242 position.

[0040] In some embodiments, such as Figures 1 to 3As shown, the printhead body includes a quick-release adapter 1. The top of the quick-release adapter 1 has a feed port 11 for carbon fiber to pass through. The quick-release adapter 1 has an observation port 12 on one side.

[0041] A motor 2 is also fixed on the side of the quick-release adapter 1 away from the observation port 12. A cutter 22 is fixed on the rotor of the motor 2. A cutter cylinder 21 is sleeved on the outside of the cutter 22. One end of the cutter cylinder 21 is fixedly connected to the surface of the motor 2. Both the cutter cylinder 21 and the cutter 22 are located inside the quick-release adapter 1.

[0042] The surface of the cutter barrel 21 is provided with a second feed port 211, and the second feed port 211 is coaxially arranged with the first feed port 11.

[0043] The cutter 22 is cylindrical, and the cutter tube 21 has two feed ports 211 at both the upper and lower ends. The size of the upper feed port 211 is smaller than that of the lower feed port 211, which facilitates the insertion of carbon fiber filaments.

[0044] Specifically, the observation port 12 is used to observe the inside of the cutter 22 and the blade barrel 21. When there is a jam or the blade of the cutter 22 needs to be replaced, it can be observed through the observation port 12.

[0045] Furthermore, the second feed port 211 is coaxially arranged with the first feed port 11. When in use, the carbon fiber filament is inserted into the first feed port 11 and enters the second feed port 211. The motor 2 is used to drive the cutter 22 to rotate in the cutter barrel 21 and cut the carbon fiber filament through the transverse cutting force.

[0046] In some embodiments, such as Figures 1 to 5 As shown, the top of the heat sink 23 is recessed inward to form a feed inlet 3 231. The feed inlet 3 231 is located below the feed inlet 211, and the feed inlet 3 231, the feed inlet 211 and the feed inlet 11 are coaxially arranged from bottom to top.

[0047] The bottom of the metal throat 24 is equipped with a heating component for heating the carbon fiber;

[0048] The heating assembly includes a heating block 4, a heating rod 41, and a thermocouple 42. The heating block 4 is fixed to the bottom of the quick-release adapter 1. The heating rod 41 and the thermocouple 42 are respectively embedded in the heating block 4. The heating rod 41 is responsible for generating heat to heat the carbon fiber filaments inside the metal throat 24. The thermocouple 42 is used to monitor the temperature of the heating area in real time and feed the temperature signal back to the control system of the external device for precise control of the heating temperature. One end of the metal throat 24 passes through the center of the top of the heating block 4 and extends into the interior of the heating block 4, so that the carbon fiber filaments can fully contact the heat generated by the heating rod 41 inside the metal throat 24, achieving efficient heating.

[0049] Specifically, one end of the carbon fiber filament passes through the feed inlet 11, feed inlet 211 and feed inlet 32312 in sequence, and extends to the bottom of the metal throat 24 to reach the heating assembly for heating treatment. This structural design allows the carbon fiber filament to enter the heating area step by step along a predetermined path from the moment it enters the device, ensuring the continuity and stability of the heating process.

[0050] Furthermore, regarding thermocouple 42:

[0051] Thermocouple 42 is a temperature measuring element that operates based on the thermoelectric effect. It consists of a closed circuit composed of two metal conductors of different materials. When there is a temperature difference between the measuring end (hot end) and the reference end (cold end) of thermocouple 42, a thermoelectric electromotive force (EMF) is generated in the circuit. The magnitude of this EMF is proportional to the temperature difference. In this device, the measuring end of thermocouple 42 is located inside the heating block 4, close to the heating rod 41 and the metal throat 24, enabling it to sense the temperature of the heating area in real time. As the temperature of the heating area changes, the temperature difference between the measuring end and the reference end of the thermocouple also changes, thereby generating a corresponding thermoelectric EMF signal. At this time, thermocouple 42... 2. The generated thermoelectric potential signal is transmitted to the temperature control system in the external device through a wire connection. The two metal conductors of the thermocouple are connected to the wires respectively, transmitting the thermoelectric potential signal to the temperature control system in the form of an electrical signal. After receiving the thermoelectric potential signal from the thermocouple, the temperature control system processes it. Since there is a certain correspondence between the thermoelectric potential signal and the temperature, the control system converts the signal into an actual temperature value according to a pre-set algorithm. The converted temperature value can be displayed on the display screen of the control system in the external device, allowing the operator to intuitively understand the temperature of the heating area.

[0052] In some embodiments, such as Figures 1 to 5 As shown, a fan 3 is fixed on one side of the quick-release adapter 1, and the fan 3 is located on one side of the metal throat 24.

[0053] Specifically, fan 3 is used to further improve the heat dissipation effect of heat sink 233, so as to avoid overheating and damage to the print head.

[0054] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0055] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fiber filament cutting device for 3D printing of continuous fiber reinforced composite materials, comprising a print head body, characterized in that, The bottom of the printhead body is fixed with a metal throat tube (24), and a telescopic heat dissipation fin body is sleeved on the surface of the metal throat tube (24). The surface of the metal throat tube (24) is provided with several scales (242), and the surface of the metal throat tube (24) is provided with a nut (25) for adjusting the length of the heat dissipation fin body. The telescopic heat dissipation fin body includes a heat dissipation cylinder (23) and heat dissipation fins (233). One end of the heat dissipation cylinder (23) is fixedly connected to one end of the heat dissipation fins (233). Both the heat dissipation cylinder (23) and the heat dissipation fins (233) are sleeved on the surface of the metal throat (24). The heat dissipation fins (233) are located below the heat dissipation cylinder (23). The metal throat (24) has a thread (241) formed at two-thirds of its length. The nut (25) is threaded to the surface of the metal throat (24) through the thread (241).

2. The fiber cutting device for 3D printing of continuous fiber reinforced composite materials according to claim 1, characterized in that, The inner wall of the heat sink (23) is provided with a graphite layer (232).

3. The fiber cutting device for 3D printing of continuous fiber reinforced composite materials according to claim 2, characterized in that, Several of the aforementioned scales (242) are sequentially opened from top to bottom on the surface of the thread one (241) for adjusting the sleeve position of the heat dissipation fins (233).

4. The fiber cutting device for 3D printing of continuous fiber reinforced composite materials according to claim 3, characterized in that, The printhead body includes a quick-release adapter (1), the top of which has a feed port (11) for carbon fiber to pass through, and an observation port (12) is provided on one side of the quick-release adapter (1).

5. The fiber cutting device for 3D printing of continuous fiber reinforced composite materials according to claim 4, characterized in that, A motor (2) is fixed on the side of the quick-release adapter (1) away from the observation port (12). A cutter (22) is fixed on the rotor of the motor (2). A cutter cylinder (21) is sleeved on the outside of the cutter (22). One end of the cutter cylinder (21) is fixedly connected to the surface of the motor (2). Both the cutter cylinder (21) and the cutter (22) are located inside the quick-release adapter (1).

6. The fiber cutting device for 3D printing of continuous fiber reinforced composite materials according to claim 5, characterized in that, The surface of the cutter barrel (21) is provided with a second feed port (211), and the second feed port (211) is coaxially arranged with the first feed port (11).

7. The fiber cutting device for 3D printing of continuous fiber reinforced composite materials according to claim 6, characterized in that, The top of the heat sink (23) is recessed inward to form a feed inlet three (231), the feed inlet three (231) is located below the feed inlet two (211), and the feed inlet three (231), feed inlet two (211) and feed inlet one (11) are coaxially arranged from bottom to top.

8. The fiber cutting device for 3D printing of continuous fiber reinforced composite materials according to claim 7, characterized in that, A fan (3) is fixed to one side of the quick-release adapter (1), and the fan (3) is located on one side of the metal throat (24).

9. The fiber cutting device for 3D printing of continuous fiber reinforced composite materials according to claim 8, characterized in that, The bottom of the metal throat (24) is provided with a heating component for heating carbon fibers; The heating assembly includes a heating block (4), a heating rod (41), and a thermocouple (42). The heating block (4) is fixed to the bottom of the quick-release adapter (1). The heating rod (41) and the thermocouple (42) are respectively embedded in the heating block (4). One end of the metal throat tube (24) passes through the center of the top of the heating block (4) and extends into the interior of the heating block (4).

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