Plastic additive 3D printing auxiliary extrusion mechanism
By combining multi-stage heating and stirring mechanisms, the problems of material degradation and uneven extrusion caused by heating in a single temperature zone in traditional plastic additive 3D printing are solved, achieving more uniform material flow and higher printing quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-10
AI Technical Summary
Traditional plastic additive 3D printing uses a single-temperature zone heating mode for its extrusion mechanism, which leads to easy thermal decomposition of plastic, deterioration of material properties, uneven extrusion flow, and affects the strength and precision of the printed parts.
It adopts a multi-stage heating mode, including a softening chamber, a primary preheating chamber, a final heating chamber, and a melt holding chamber. Combined with a stirring mechanism, it gradually heats up and stirs the plastic granules to avoid direct melting at high temperatures and ensure uniform material flow.
It improves the fluidity and interlayer bonding strength of plastics, reduces printing defects, and enhances the smoothness and dimensional accuracy of printed parts.
Smart Images
Figure CN223982177U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to 3D printing technical field, concretely relates to a kind of plastic additive 3D printing auxiliary extrusion mechanism. BACKGROUND
[0002] The core of plastic additive manufacturing is to accumulate layer by layer by heating, extruding plastic filament or particles. But the traditional extrusion mechanism adopts single temperature zone heating mode, that is, the plastic particles are directly subjected to high temperature by heating block to make them melt. But plastic is easy to decompose under high temperature, which leads to the decrease of the strength of printed parts. Some engineering plastics may cause local carbonization due to high crystallinity under sudden heating, which leads to the deterioration of material performance. At the same time, the melt viscosity fluctuates significantly with temperature, and direct high-temperature heating can easily cause uneven extrusion flow, which shows as wire drawing, interlayer void or overflow, affecting the size accuracy. SUMMARY
[0003] The utility model aims at providing a kind of plastic additive 3D printing auxiliary extrusion mechanism, which can slowly convey plastic particles, so as to avoid the problem of deterioration and uneven extrusion of plastic caused by directly applied high temperature.
[0004] The technical solutions adopted by the utility model are as follows:
[0005] A kind of plastic additive 3D printing auxiliary extrusion mechanism, comprising an extrusion shell, the extrusion shell includes a softening bin, the bottom end of the softening bin is fixed with a primary preheating bin, the bottom end of the primary preheating bin is fixed with a final heating bin, the bottom of the final heating bin is fixed with a melting maintenance bin, and the bottom of the melting maintenance bin is fixed with an extrusion pipe;
[0006] An extrusion stirring mechanism is installed inside the extrusion shell, the extrusion stirring mechanism includes a first motor, the first motor is fixed on the top of the softening bin, a first rotating rod is fixed on the output end of the first motor and located inside the softening bin, the primary preheating bin and the final heating bin, a first conveying spiral plate is fixed on the outside of the first rotating rod, and the outside of the first conveying spiral plate is attached to the inside of the softening bin, the primary preheating bin and the final heating bin.
[0007] One side of the top of the softening bin is fixed with a feeding port.
[0008] Further, the inside of the softening bin, the primary preheating bin, the final heating bin and the melting maintenance bin is provided with a temperature insulation cavity, low-temperature heating wires are installed in the temperature insulation cavity of the softening bin, medium-temperature heating wires are installed in the temperature insulation cavity of the primary preheating bin, and high-temperature heating wires are installed in the temperature insulation cavities of the final heating bin and the melting maintenance bin.
[0009] Further, a partition plate is fixed between the final heating bin and the melting maintaining bin, the bottom of the first rotating rod penetrates through the partition plate and is rotationally connected with the partition plate, and a discharging gap is formed in one end of the partition plate.
[0010] Further, the extrusion stirring mechanism further comprises a second motor, the second motor is fixed at the bottom of the melting maintaining bin, an output end of the second motor is fixed with a second rotating rod, the top of the second rotating rod is rotationally connected with the bottom of the first rotating rod, a second stirring rod is fixed outside the second rotating rod, and a second conveying spiral plate is fixed outside the second rotating rod.
[0011] Further, the first stirring rod is installed outside the first rotating rod and between each layer of the first conveying spiral plate.
[0012] The utility model discloses obtained technical effect is:
[0013] The utility model discloses realize multistage heating through softening bin, preliminary preheating bin, final heating bin and melting maintaining bin, and the gradual temperature rise can avoid the degradation or bubble production of plastic particles due to direct high-temperature melting, can be the liquidity of material more uniform, reduce printing defect, increase the bonding strength and the smoothness between layers.
[0014] The utility model discloses the action of first rotating rod, first conveying spiral plate and first stirring rod can continuously stir plastic particles in the conveying process, make plastic particles heat more evenly, and the second conveying spiral plate and the second stirring rod in the melting maintaining bin can further stir and extrude control to the molten plastic through the positive and negative rotation control. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is the structure schematic diagram of the utility model;
[0016] Figure 2 It is the local section structure schematic diagram of the utility model;
[0017] Figure 3 It is the local section structure schematic diagram of the extrusion shell of the utility model;
[0018] Figure 4 It is the structure schematic diagram of the extrusion stirring mechanism of the utility model.
[0019] In the drawings, the component list represented by each sign is as follows:
[0020] 1, extrusion shell; 2, extrusion stirring mechanism; 3, feeding port; 11, softening bin; 12, low-temperature heating wire; 13, primary preheating bin; 14, medium-temperature heating wire; 15, final heating bin; 16, high-temperature heating wire; 17, partition plate; 18, melt maintaining bin; 19, extrusion pipe; 21, first motor; 22, first rotating rod; 23, first conveying spiral plate; 24, first stirring rod; 25, second motor; 26, second rotating rod; 27, second conveying spiral plate; 28, second stirring rod. DETAILED DESCRIPTION
[0021] In order to make the purpose and advantages of the utility model more clear and apparent, the utility model is specifically described below in combination with examples. It should be understood that the following text is only used to describe one or several specific embodiments of the utility model and does not strictly limit the specific protection scope requested by the utility model.
[0022] As shown in Figures 1 to 4 A plastic additive 3D printing auxiliary extrusion mechanism, comprising an extrusion shell 1, the extrusion shell 1 comprises a softening bin 11, the bottom end of the softening bin 11 is fixed with a primary preheating bin 13, the bottom end of the primary preheating bin 13 is fixed with a final heating bin 15, the bottom of the final heating bin 15 is fixed with a melt maintaining bin 18, and the bottom of the melt maintaining bin 18 is fixed with an extrusion pipe 19.
[0023] An extrusion stirring mechanism 2 is installed inside the extrusion shell 1, the extrusion stirring mechanism 2 comprises a first motor 21, the first motor 21 is fixed at the top of the softening bin 11, the output end of the first motor 21 and located inside the softening bin 11, the primary preheating bin 13 and the final heating bin 15 are fixed with a first rotating rod 22, the outside of the first rotating rod 22 is fixed with a first conveying spiral plate 23, and the outside of the first conveying spiral plate 23 is in close contact with the inside of the softening bin 11, the primary preheating bin 13 and the final heating bin 15.
[0024] A feeding port 3 is fixed on one side of the top of the softening bin 11.
[0025] In use, the plastic particles are put into the inside of the extrusion shell 1 from the feeding port 3, the first rotating rod 22 and the first conveying spiral plate 23 are rotated together by the first motor 21, the first conveying spiral plate 23 can gradually transport the plastic particles from the softening bin 11 to the melt maintaining bin 18, and gradually pass through the softening bin 11, the primary preheating bin 13 and the final heating bin 15 for step-by-step heating, so that the plastic particles can be better melted, the conversion process from solid to melt state of the plastic can be accurately controlled by staged heating, material degradation or bubble generation caused by sudden temperature rise can be avoided, the material fluidity is more uniform, the interlayer bonding strength and surface finish of the printing are improved, and the melted plastic is extruded from the extrusion pipe 19.
[0026] Furthermore, the extrusion tube 19 integrates an electric heating module, which can prevent extrusion blockage caused by plastic hardening during the extrusion process.
[0027] Please refer to the following: Figure 2 and Figure 3 As shown, the softening chamber 11, the primary preheating chamber 13, the final heating chamber 15 and the melt holding chamber 18 are provided with heat insulation cavities. Low-temperature heating wire 12 is installed in the heat insulation cavity of the softening chamber 11, medium-temperature heating wire 14 is installed in the heat insulation cavity of the primary preheating chamber 13, and high-temperature heating wire 16 is installed in the heat insulation cavities of the final heating chamber 15 and the melt holding chamber 18.
[0028] In the above, the low-temperature heating wire 12 enables the softening chamber 11 to generate a temperature sufficient for pre-softening of the plastic particles, and the plastic particles are pre-softened while being conveyed in the softening chamber 11. The medium-temperature heating wire 14 enables the primary preheating chamber 13 to generate a temperature sufficient for primary preheating, allowing the plastic particles to undergo initial melting in the primary preheating chamber 13. The high-temperature heating wire 16 enables the final heating chamber 15 and the melt holding chamber 18 to reach the final heating temperature, allowing the plastic particles to completely melt in the final heating chamber 15 and the melt holding chamber 18, thereby achieving better extrusion.
[0029] Please refer to it again. Figure 2 As shown, a partition 17 is fixed between the final heating chamber 15 and the melt holding chamber 18. The bottom of the first rotating rod 22 passes through the partition 17 and is rotatably connected to the partition 17. A material discharge notch is provided at one end of the partition 17.
[0030] In the above, the notch provided below the partition 17 is used to squeeze the molten plastic into the molten holding chamber 18 when the first conveying spiral plate 23 rotates.
[0031] Please refer to the following: Figure 2 and Figure 4 As shown, the extrusion stirring mechanism 2 also includes a second motor 25, which is fixed to the bottom of the melt holding chamber 18. A second rotating rod 26 is fixed to the output end of the second motor 25. The top of the second rotating rod 26 is rotatably connected to the bottom of the first rotating rod 22. A second stirring rod 28 is fixed to the outer side above the second rotating rod 26. A second conveying spiral plate 27 is fixed to the outer side below the second rotating rod 26. The outer side of the second conveying spiral plate 27 is in contact with the inner side of the bottom of the second stirring rod 28.
[0032] As described above, the molten plastic entering the second stirring rod 28 is rotated in the opposite direction by the second motor 25 to drive the second rotating rod 26 before extrusion. The second stirring rod 28 stirs the molten plastic to make it melt more evenly and maintain its molten state. When extruding the plastic, the second motor 25 drives the second rotating rod 26 to rotate in the forward direction. Under the conveying of the second conveying spiral plate 27, the molten plastic above the second conveying spiral plate 27 is conveyed to the extrusion tube 19 and extruded.
[0033] Please refer to the following: Figure 2 and Figure 4 As shown, a first stirring rod 24 is installed on the outside of the first rotating rod 22 and between each layer of the first conveying spiral plate 23;
[0034] As described above, the first stirring rod 24 can stir the plastic while the first conveying spiral plate 23 is conveying the plastic, so that it is heated more evenly.
[0035] The working principle of this utility model is as follows: Plastic granules enter the softening chamber 11 through the feeding port 3. The low-temperature heating wire 12 controls the temperature inside the softening chamber 11 to a range where the plastic can be pre-softened. The first motor 21 drives the first rotating rod 22 to rotate, and the plastic granules are conveyed to the primary preheating chamber 13 by the rotation of the first conveying spiral plate 23. At the same time, the first stirring rod 24 sweeps over the plastic granules, stirring them to make them soften evenly. The medium-temperature heating wire 14 in the primary preheating chamber 13 further heats the primary preheating chamber 13, so that the softened plastic granules are initially melted when they pass through the primary preheating chamber 13, and held by the first conveying spiral plate 23 and the first stirring rod 24. Continuous conveying and stirring, the high-temperature heating wire 16 in the final heating chamber 15 can completely melt the plastic. The feeding notch set in the partition 17 can squeeze the molten plastic into the melt-only holding chamber 18 during the continuous conveying and stirring of the first conveying spiral plate 23 and the first stirring rod 24. The molten plastic in the melt-holding chamber 18 is kept in a molten state by the high-temperature heating wire 16. The second motor 25 controls the second rotating rod 26 to rotate forward and backward as needed. The second rotating rod 26 can convey the molten plastic to the extrusion tube 19 through the second conveying spiral plate 27 for extrusion. The second rotating rod 26 can maintain the stirring of the molten plastic in the melt-holding chamber 18 and prevent local cooling and separation.
[0036] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.
Claims
1. A plastic additive 3D printing assisted extrusion mechanism, characterized in that: Including extrusion shell (1), the extrusion shell (1) includes softening bin (11), the bottom end of softening bin (11) is fixed with primary preheating bin (13), the bottom end of primary preheating bin (13) is fixed with final heating bin (15), the bottom of final heating bin (15) is fixed with melt maintaining bin (18), the bottom of melt maintaining bin (18) is fixed with extrusion pipe (19); Extrusion stirring mechanism (2), the extrusion stirring mechanism (2) is installed in the inside of extrusion shell (1), the extrusion stirring mechanism (2) includes first motor (21), the first motor (21) is fixed at the top of softening bin (11), the output end of first motor (21) and the inside of softening bin (11), primary preheating bin (13) and final heating bin (15) are fixed with first rotating rod (22), the outside of first rotating rod (22) is fixed with first conveying spiral plate (23), the outside of first conveying spiral plate (23) is attached with the inside of softening bin (11), primary preheating bin (13) and final heating bin (15); The side of the top of softening bin (11) is fixed with feeding port (3).
2. A plastic additive 3D printing assisted extrusion mechanism according to claim 1, characterized in that: The inside of softening bin (11), primary preheating bin (13), final heating bin (15) and melt maintaining bin (18) is provided with temperature insulation cavity, low-temperature electric heating wire (12) is installed in the temperature insulation cavity of softening bin (11), medium-temperature electric heating wire (14) is installed in the temperature insulation cavity of primary preheating bin (13), high-temperature electric heating wire (16) is installed in the temperature insulation cavity of final heating bin (15) and melt maintaining bin (18).
3. A plastic additive 3D printing assisted extrusion mechanism according to claim 1, characterized in that: The bottom of first rotating rod (22) penetrates through baffle (17) and is rotationally connected with baffle (17), and a discharging gap is formed in one end of baffle (17).
4. A plastic additive 3D printing auxiliary extrusion mechanism according to claim 1, characterized in that: The extrusion stirring mechanism (2) further includes second motor (25), the second motor (25) is fixed at the bottom of melt maintaining bin (18), the output end of second motor (25) is fixed with second rotating rod (26), the top of second rotating rod (26) is rotationally connected with the bottom of first rotating rod (22), second stirring rod (28) is fixed on the outside of the upper portion of second rotating rod (26), second conveying spiral plate (27) is fixed on the outside of the lower portion of second rotating rod (26), and the outside of second conveying spiral plate (27) is attached with the inside of the bottom of second stirring rod (28).
5. A plastic additive 3D printing assisted extrusion mechanism as claimed in claim 1, wherein: First stirring rod (24) is installed on the outside of first rotating rod (22) and between each layer of first conveying spiral plate (23).