3D printing particle extrusion device

Abstract

The utility model relates to 3D printing technical field discloses a kind of 3D printing granule extrusion device, including guide machine, the guide machine one side is fixedly connected with feed pipe, the guide machine outer wall is fixedly connected with fan, the guide machine bottom is fixedly connected with connecting pipe, the connecting pipe bottom end is fixedly connected with intercommunication block, the intercommunication block outer wall is provided with heating assembly, the intercommunication block bottom is fixedly connected with fixed shell, the fixed shell top is provided with spray material head, the spray material head top is provided with mounting assembly, the mounting assembly includes screw thread cylinder and multiple clamping columns, the screw thread cylinder bottom is fixedly connected in the top of the spray material head, the spray material head is connected in the inner wall of the fixed shell by screwing.The utility model in the present application, by pressing plate, clamping column and the quick dismounting structure of connecting ring, reach the effect of convenient replacement and cleaning spray material head, its screw thread plus the double fixing mode of buckle, the stability of spray material head installation is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing, and in particular to a 3D printing particle extrusion device. Background Technology

[0002] In the current wave of rapid development in 3D printing technology, 3D printing particle extrusion equipment, as one of the core pieces of equipment in the additive manufacturing field, undertakes the crucial task of heating and melting raw materials such as polymer particles and composite material particles, and then precisely extruding and layer-by-layering them through a nozzle to form a finished product. Its performance directly affects the precision, strength, and surface quality of the printed parts, and it is widely used in various fields such as industrial parts manufacturing, prototype design, and architectural model building. With the market's increasing demands for printing efficiency, material adaptability, and equipment durability, optimizing the structural design of the equipment and improving its operational stability and ease of maintenance has become an important direction for continuous exploration within the industry.

[0003] Current 3D printing particle extrusion devices use a single threaded connection structure to connect the nozzle to the main body. Specifically, the nozzle has external threads on its outer surface, and a matching internal thread on the inner side of the extrusion device's outlet. The nozzle is secured to the main body by screwing its external thread into the internal thread of the outlet, utilizing the meshing of the threads. This technology relies entirely on the self-locking properties of the threads. The nozzle is manually or with the aid of tools rotated until the threads are tightly engaged, ensuring a stable connection. No other auxiliary fixing or sealing components are included in this connection structure.

[0004] However, the existing threaded connection design is prone to loosening during long-term operation. Because the 3D printing particle extrusion device generates continuous vibration during operation, and the nozzle experiences significant temperature changes due to the melting material, thermal expansion and contraction can easily occur. These factors continuously affect the threaded connection, causing the originally tightly interlocking threads to gradually loosen. Once the nozzle loosens, it not only affects the stability of material extrusion and printing accuracy but also leads to material leakage, seriously threatening the long-term reliability of the equipment. Therefore, a new 3D printing particle extrusion device is proposed to address these issues. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a 3D printing particle extrusion device, which aims to improve the problem of loose threaded connection of the nozzle caused by long-term vibration or thermal expansion and contraction of the equipment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A 3D printing particle extrusion device includes a guide machine, a feed pipe fixedly connected to one side of the guide machine, a fan fixedly connected to the outer wall of the guide machine, a connecting pipe fixedly connected to the bottom of the guide machine, a connecting block fixedly connected to the bottom end of the connecting pipe, a heating component provided on the outer wall of the connecting block, a fixed shell fixedly connected to the bottom of the connecting block, a nozzle provided on the top of the fixed shell, and an installation component provided on the top of the nozzle. The mounting assembly includes a threaded cylinder and multiple locking pins. The bottom of the threaded cylinder is fixedly connected to the top of the nozzle. The nozzle is threadedly connected to the inner wall of the fixed housing. A connecting ring is fixedly connected to the top of the threaded cylinder. The multiple locking pins are slidably connected to the inner wall of the fixed housing and engage with the grooves on the outer wall of the connecting ring. Each locking pin has a pushing component on its outer wall.

[0007] As a further description of the above technical solution: Each of the pushing components includes a pressing plate, each of the pressing plates is located at the bottom of the locking post, and multiple support plates are fixedly connected to both sides of the fixing shell.

[0008] As a further description of the above technical solution: A rotating bar is fixedly connected between two adjacent support plates, and each pressing plate is rotatably connected to the outer wall of the rotating bar.

[0009] As a further description of the above technical solution: Each of the pressing plates is fixedly connected to one side of a connecting block, and each of the connecting blocks is fixedly connected to the inner wall of a connecting strip. Each of the connecting strips is rotatably connected to the inside of the locking post.

[0010] As a further description of the above technical solution: Each of the pressing plates is provided with a spring on one side, and one end of each spring is fixedly connected to the outer wall of the fixed shell, while the other end of each fixed shell is fixedly connected to one side of the pressing plate.

[0011] As a further description of the above technical solution: The heating assembly includes a heating plate one and a heating plate three. The inner walls of the heating plate one and the heating plate three are fixedly connected to the outer wall of the connecting block. A ceramic plate two is fixedly connected between the heating plate one and the heating plate three.

[0012] As a further description of the above technical solution: The inner wall of the second ceramic plate is fixedly connected to the outer wall of the connecting block, and the outer walls of the first heating plate, the second ceramic plate, and the third heating plate are fixedly connected with protective shells.

[0013] As a further description of the above technical solution: The outer wall of the protective shell is fixedly connected with multiple metal heat sinks, and one side of each metal heat sink has a wave-shaped structure.

[0014] This utility model has the following beneficial effects: 1. In this utility model, the quick-disassembly and assembly structure composed of a pressing plate, a locking post, and a connecting ring achieves the function of convenient replacement and cleaning of the spray head. Its dual fixing method of threads and buckles solves the problem of loosening of the spray head thread connection due to long-term vibration or thermal expansion and contraction of the equipment, and enhances the stability of the spray head installation and the reliability of long-term operation.

[0015] 2. In this utility model, by setting up a segmented heating component and an intermediate heat-insulating ceramic plate, the precise control of preheating and melting of the printing material is achieved, which solves the technical problem of blockage caused by premature melting of the material at the feed end due to uneven heat conduction in traditional extrusion devices. At the same time, the external corrugated heat dissipation plate and fan enhance the thermal stability of the equipment during long-term operation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a 3D printing particle extrusion device proposed in this utility model; Figure 2 This is a schematic diagram of the protective shell structure of a 3D printing particle extrusion device proposed in this utility model; Figure 3 This is a schematic diagram of the heating plate structure of a 3D printing particle extrusion device proposed in this utility model; Figure 4 This is a schematic diagram of the clamping column structure of a 3D printing particle extrusion device proposed in this utility model; Figure 5 for Figure 4 A magnified structural diagram at point A in the diagram.

[0017] Legend: 1. Guide machine; 2. Feed pipe; 3. Fan; 4. Connecting pipe; 5. Connecting block; 6. Fixed shell; 7. Spray head; 8. Heating plate one; 9. Ceramic plate two; 10. Heating plate three; 11. Protective shell; 12. Metal heat sink; 13. Threaded cylinder; 14. Connecting ring; 15. Clamping post; 16. Connecting block; 17. Pressing plate; 18. Rotating bar; 19. Support plate; 20. Spring; 21. Connecting bar. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figures 1-5This utility model provides an embodiment of a 3D printing particle extrusion device, including a guide machine 1. A feed pipe 2 is fixedly connected to one side of the guide machine 1, guiding external particle material smoothly into the device. A fan 3 is fixedly connected to the outer wall of the guide machine 1, using the fan 3 to provide forced air cooling to the guide machine 1 and its upper structure, effectively preventing excessive upward heat conduction. A connecting pipe 4 is fixedly connected to the bottom of the guide machine 1, creating a stable downward material conveying channel. A connecting block 5 is fixedly connected to the bottom of the connecting pipe 4, serving as the core heating and melting chamber. A heating component is provided on the outer wall of the connecting block 5, providing the heat required for melting the material and achieving particle extrusion. Precision heat treatment is applied. A fixed housing 6 is fixedly connected to the bottom of the connecting block 5 to support and protect the nozzle and mounting structure below. The top of the fixed housing 6 houses the ejector head 7, a key component in 3D printing. An mounting assembly is located on top of the ejector head 7. The overall design of this mounting assembly enables quick assembly and disassembly of the ejector head 7 and secure locking, greatly improving the maintainability of the equipment. The mounting assembly includes a threaded cylinder 13 and multiple locking pins 15. The threaded engagement of the threaded cylinder 13 provides the main axial tightening force to ensure the basic installation stability of the ejector head 7. The bottom of the threaded cylinder 13 is fixedly connected to the top of the ejector head 7, and the ejector head 7 is threadedly connected to the inner wall of the fixed housing 6. A connecting ring 14 with grooves is fixedly connected to the top of the threaded cylinder 13. The contact surface is used to lock the locking pins 15. Multiple locking pins 15 are slidably connected to the inner wall of the fixed housing 6 and engage with the groove on the outer wall of the connecting ring 14. The engagement between the locking pins 15 and the connecting ring 14 provides radial locking, which prevents the threaded cylinder 13 from accidentally rotating and loosening in the vibration environment during equipment operation. Each locking pin 15 has a pushing component on its outer wall. The operator can easily and conveniently control the extension and retraction of the locking pin 15 by pushing the component, achieving quick locking and releasing. Each pushing component includes a pressing plate 17, and each pressing plate 17 is located at the bottom of the locking pin 15. Multiple support plates 19 are fixedly connected to both sides of the fixed housing 6 to provide a stable mounting base for the rotating structure. A fixed connection is made between two adjacent support plates 19. A rotating bar 18 serves as the rotation axis for the pressing plates 17. Each pressing plate 17 is rotatably connected to the outer wall of the rotating bar 18, allowing the pressing plates 17 to rotate in coordination with the rotating bar 18. This efficiently transmits the pressing force applied by the user to the linkage mechanism. A connecting block 16 is fixedly connected to one side of each pressing plate 17, and a connecting strip 21 is fixedly connected to the inner wall of each connecting block 16. Each connecting strip 21 is rotatably connected to the inside of the locking post 15. Through the cooperation between the connecting strip 21 and the inside of the locking post 15, the rotational motion of the pressing plate 17 is smoothly converted into the linear sliding of the locking post 15, achieving flexible transmission control. A spring 20 is provided on one side of each pressing plate 17, and one end of multiple springs 20 is fixedly connected to the outer wall of the fixed shell 6.Each retaining shell 6 is fixedly connected at its other end to one side of the pressing plate 17. Utilizing the reliable return force provided by the spring 20, the locking pin 15 automatically returns to its original position and re-engages into the groove of the connecting ring 14 after the pressing plate 17 is released, enhancing the automation and immediacy of the locking function.

[0020] Reference Figures 1-3 The heating assembly includes heating plate 8 and heating plate 10. This split design allows for zoned heating and precise temperature control of the material. The inner walls of heating plate 8 and heating plate 10 are fixedly connected to the outer wall of the connecting block 5. A ceramic plate 9 is fixedly connected between heating plate 8 and heating plate 10. The inner wall of ceramic plate 9 is fixedly connected to the outer wall of the connecting block 5. The low thermal conductivity of ceramic plate 9 forms an effective thermal barrier, effectively isolating heat from the high-temperature zone to the low-temperature zone, thus preventing premature melting and blockage of the channel by the material at the feed inlet. The outer wall of the 310 is fixedly connected to a protective shell 11 to protect the internal heating element and prevent operators from accidentally touching the high-temperature surface, thereby improving the overall safety of the equipment. Multiple metal heat sinks 12 are fixedly connected to the outer wall of the protective shell 11 to increase the heat dissipation area of ​​the entire heating component and accelerate heat dissipation. Each metal heat sink 12 has a wave-shaped structure on one side. This wave-shaped structure maximizes the contact area with the surrounding air in a limited space, achieving a significant enhancement of natural convection and forced air cooling efficiency, thereby ensuring the heat balance and stable operation of the equipment during long-term printing.

[0021] Working Principle: During equipment operation, 3D printing granules first enter the interior of the guide machine 1 through the feed pipe 2. Driven by the guide machine 1, the material flows downward through the connecting pipe 4 and is fed into the connecting block 5. To achieve precise melting of the material, the heating component adopts a segmented heating method. When the material enters the upper area of ​​the connecting block 5, the heating plate 8 preheats it. This step can uniformly raise the temperature of the material to near the melting point, but does not completely melt it. Then, the material passes through the middle area composed of the ceramic plate 9. Due to its excellent heat insulation performance, the ceramic plate effectively forms a heat isolation zone, achieving precise control of the heating process. This solves the problem of premature melting and blockage of the material in the feed channel caused by rapid upward heat conduction in traditional extruders. When the preheated material finally reaches the lower area of ​​the connecting block 5, the high temperature generated by the heating plate 10 quickly and fully melts it into a fluid state suitable for printing, and then it is extruded through the nozzle 7. Throughout the heating process, the protective shell 11 wrapped around the outside and the multiple wave-shaped metal heat dissipation plates 12 on its surface work together with the fan 3 on the upper part of the machine. The wave structure of the metal heat dissipation plate 12 significantly increases the contact area with the air, thereby accelerating the dissipation of internal heat and enhancing the heat dissipation effect of the equipment during long-term stable operation. When the nozzle 7 needs to be cleaned or replaced, the operator simply needs to press the pressing plates 17 located on both sides of the fixed housing 6 inwards. Each pressing plate 17 will rotate inwards around the rotating bar 18, compressing the spring 20 in the process. Since the pressing plates 17 are connected to the locking pins 15 through the connecting block 16 and the connecting bar 21, the rotation of the pressing plates 17 will cause the locking pins 15 to slide inside the fixed housing 6, causing them to disengage from the groove on the outer wall of the connecting ring 14. When both locking pins 15 are fully retracted, the locking of the connecting ring 14 is released. At this time, the operator can easily rotate the nozzle 7 and remove it through the threaded engagement between the threaded cylinder 13 at its top and the fixed housing 6. When reinstalling, the operation is reversed. After rotating the nozzle 7 into place, the pressing plates 17 are released, and the elastic force of the spring 20 will automatically push the locking pins 15 back to their original position and securely lock them into the groove of the connecting ring 14. This design achieves circumferential locking of the threaded cylinder 13 through the tight engagement of the locking post 15 and the groove of the connecting ring 14, thus preventing the connection from loosening. It effectively solves the problem of the threaded connection of the nozzle 7 gradually loosening due to factors such as equipment vibration or thermal expansion and contraction during the printing process, thereby enhancing the stability of the nozzle 7 installation and the reliability of long-term operation.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A 3D printing particle extrusion device, comprising a guide machine (1), characterized in that: The guide machine (1) is fixedly connected to a feed pipe (2) on one side, a fan (3) is fixedly connected to the outer wall of the guide machine (1), a connecting pipe (4) is fixedly connected to the bottom of the guide machine (1), a connecting block (5) is fixedly connected to the bottom end of the connecting pipe (4), a heating component is provided on the outer wall of the connecting block (5), a fixed shell (6) is fixedly connected to the bottom of the connecting block (5), a spray head (7) is provided on the top of the fixed shell (6), and an installation component is provided on the top of the spray head (7). The mounting assembly includes a threaded cylinder (13) and multiple locking pins (15). The bottom of the threaded cylinder (13) is fixedly connected to the top of the nozzle (7). The nozzle (7) is threadedly connected to the inner wall of the fixed housing (6). A connecting ring (14) is fixedly connected to the top of the threaded cylinder (13). The multiple locking pins (15) are slidably connected to the inner wall of the fixed housing (6) and engage with the groove on the outer wall of the connecting ring (14). Each locking pin (15) has a pushing component on its outer wall.

2. The 3D printing particle extrusion device according to claim 1, characterized in that: Each of the pushing components includes a pressing plate (17), each of the pressing plates (17) is located at the bottom of the locking post (15), and multiple support plates (19) are fixedly connected to both sides of the fixing shell (6).

3. The 3D printing particle extrusion device according to claim 2, characterized in that: A rotating bar (18) is fixedly connected between two adjacent support plates (19), and each pressing plate (17) is rotatably connected to the outer wall of the rotating bar (18).

4. The 3D printing particle extrusion device according to claim 3, characterized in that: Each of the pressing plates (17) is fixedly connected to one side of a connecting block (16), and each of the connecting blocks (16) is fixedly connected to the inner wall of a connecting strip (21), and each of the connecting strips (21) is rotatably connected to the inside of the locking post (15).

5. The 3D printing particle extrusion device according to claim 4, characterized in that: Each of the pressing plates (17) is provided with a spring (20) on one side. One end of each of the springs (20) is fixedly connected to the outer wall of the fixed shell (6), and the other end of each of the fixed shells (6) is fixedly connected to one side of the pressing plate (17).

6. The 3D printing particle extrusion device according to claim 1, characterized in that: The heating assembly includes a heating plate one (8) and a heating plate three (10). The inner walls of the heating plate one (8) and the heating plate three (10) are fixedly connected to the outer wall of the connecting block (5). A ceramic plate two (9) is fixedly connected between the heating plate one (8) and the heating plate three (10).

7. A 3D printing particle extrusion device according to claim 6, characterized in that: The inner wall of the ceramic plate two (9) is fixedly connected to the outer wall of the connecting block (5), and the outer walls of the heating plate one (8), ceramic plate two (9) and heating plate three (10) are fixedly connected to a protective shell (11).

8. A 3D printing particle extrusion device according to claim 7, characterized in that: The outer wall of the protective shell (11) is fixedly connected with multiple metal heat sinks (12), and one side of each metal heat sink (12) has a wave-shaped structure.

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