3D printer extrusion head suitable for granules

Abstract

The utility model discloses an extrusion head for a 3D printer suitable for granules, which does not need a traditional wire extrusion feeding mechanism, so that the structure of the extrusion head is simplified, and the risks of wire clamping and wire breaking of the extrusion head of a traditional fdm printer are avoided. The design of the lower flow guide block of the circular truncated cone-shaped structure is beneficial to guiding particles to the spray head more smoothly, so that the printing process is smoother, the possibility of blockage of the spray head is reduced, the maintenance work is simplified, the screw pitch of the auger blade and the progressive decrease design of the inclination angle are arranged, the feeding mechanism is optimized, and the production efficiency is improved. The hot melt particle material can be more uniformly and stably conveyed to the spray head, stripes on the surface of a printed object are reduced, so that the requirement for subsequent treatment is reduced, the surface smoothness of the printed object is improved, the particle material can be fully heated to be molten through the multiple electric heating plates, the material flow process is optimized, the printing efficiency is improved, and the printing quality is improved. And the printing speed is improved, and the method is more suitable for constructing large parts.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to an extrusion head for a 3D printer suitable for granular materials. Background Technique

[0002] In the traditional fused deposition modeling (FDM) 3D printing technology, there are several major technical challenges and defects. First of all, the problem of material leakage after shutdown is a common phenomenon, which is usually caused by the plastic dripping out of the nozzle when the extruder moves to a new position, especially during or after the printing process. This kind of material leakage not only causes material waste, but also may affect the quality and appearance of the printed object.

[0003] In addition, there are also defects in the wire feeding mechanism of traditional FDM printers. Since the wire feeding motor is usually placed at the far end of the printer, the wire needs to be sent to the extrusion head through a long conduit, which increases the risk of wire jamming and breaking. At the same time, the nozzle of the FDM printer is prone to blockage and is more difficult to maintain.

[0004] Other common defects of FDM printers include:

[0005] 1. Surface quality: The surface of the printed item has obvious stripes and needs subsequent processing to obtain a smooth appearance;

[0006] 2. Printing speed: Relatively slow and not suitable for building large parts;

[0007] 3. Material cost: The price of raw materials is relatively high, increasing the printing cost.

[0008] In view of these problems, the utility model proposes an improved design of the extrusion head for a 3D printer, aiming to solve the problem of material leakage after shutdown and optimize the wire feeding mechanism to improve the printing efficiency and quality. Content of the Utility Model

[0009] The purpose of the utility model is to provide an extrusion head for a 3D printer suitable for granular materials, so as to solve the problems existing in the prior art proposed in the above background technique.

[0010] To achieve the above purpose, the utility model provides the following technical solution: An extrusion head for a 3D printer suitable for granular materials includes a feeding part, a processing part and a material conveying part;

[0011] The feeding part is integrally connected with the processing part. The inside of the feeding part is hollow, the top of the feeding part is open, and the inside of the feeding part is communicated with the inside of the processing part. A number of groups of guide material dispersion plates are arranged at equal intervals up and down inside the feeding part;

[0012] The inside of the processing part is hollowly arranged. A driving motor is installed at the top of the processing part, and a spray head is fixedly connected to the bottom of the processing part. The motor shaft of the driving motor passes through the top of the processing part and is fixedly connected with an auger blade. The auger blade is vertically arranged inside the processing part. A first electric heating plate is arranged on the inner wall surface at the upper end of the processing part. A second electric heating plate, a lower flow guide block, and an extrusion hot end are fixedly arranged in sequence from top to bottom inside the lower end of the processing part. A third electric heating plate is fixedly arranged inside the extrusion hot end;

[0013] The feeding part is arranged directly above the feeding part, and a protective cover is flip-connected to the top of the feeding part through a hinge.

[0014] Preferably, the bottom of the feeding part is inclined, and a preheating electric heating plate is arranged on the inclined part of the inner bottom of the feeding part.

[0015] Preferably, the material guiding and dispersing plates are inclined, the lengths of several groups of material guiding and dispersing plates increase from top to bottom, and the edges of several groups of material guiding and dispersing plates close to the auger blade are located at the same vertical position.

[0016] Preferably, the pitch of the auger blade decreases regularly from top to bottom in sequence.

[0017] Preferably, the inclination angle of the blades of the auger blade decreases regularly from top to bottom in sequence.

[0018] Preferably, the inner side of the lower flow guide block is of a frustum-shaped structure.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. The extrusion head for a 3D printer applicable to granular materials does not require a traditional wire extrusion feeding mechanism, simplifies the structure of the extrusion head, avoids the risks of wire jamming and wire breaking of the extrusion head of a traditional FDM printer. The design of the lower flow guide block with a frustum-shaped structure helps to more smoothly guide the granular materials to the spray head, making the printing process more smooth, reducing the possibility of spray head blockage, and simplifying the maintenance work;

[0021] 2. The extrusion head for a 3D printer applicable to granular materials optimizes the feeding mechanism by setting the decreasing design of the pitch and inclination angle of the auger blade, helps to more evenly and stably convey the molten granular materials to the spray head, reduces the stripes on the surface of the printed article, thereby reducing the need for subsequent processing and improving the surface smoothness of the printed article;

[0022] 3. The extrusion head for a 3D printer applicable to granular materials can fully heat the granular materials to melting through multiple electric heating plates, optimizes the material flow process, improves the printing efficiency, enables the printing speed to be increased, and is more suitable for constructing large parts;

[0023] 4. The extrusion head for 3D printers applicable to pellet materials effectively improves and solves the problem of material leakage after shutdown, reduces material waste, and maintains the quality and appearance of printed objects.

[0024] 5. The extrusion head for 3D printers applicable to pellet materials can better handle different types of pellet materials, including those materials that are difficult to handle by traditional FDM printers, thus expanding the material selection range for 3D printing. Brief Description of the Drawings

[0025] Figure 1 FIG. is a schematic structural diagram of an extrusion head for 3D printers applicable to pellet materials according to the present utility model;

[0026] Figure 2 FIG. is another schematic structural diagram of an extrusion head for 3D printers applicable to pellet materials according to the present utility model;

[0027] Figure 3 FIG. is a front structural sectional view of an extrusion head for 3D printers applicable to pellet materials according to the present utility model;

[0028] Figure 4 FIG. is a front view of the auger blade of an extrusion head for 3D printers applicable to pellet materials according to the present utility model;

[0029] Figure 5 FIG. is an axonometric view of the auger blade shaft of an extrusion head for 3D printers applicable to pellet materials according to the present utility model;

[0030] Figure 6 FIG. is a schematic diagram of an extrusion head for 3D printers applicable to pellet materials according to the present utility model when applied to a 3D printer.

[0031] In the figure:

[0032] 1. Feeding part; 11. Guide and dispersion plate; 12. Preheating electric heating plate;

[0033] 2. Processing part; 21. Driving motor; 22. Auger blade;

[0034] 23. First electric heating plate; 24. Second electric heating plate; 25. Lower diversion block;

[0035] 26. Extrusion hot end; 27. Third electric heating plate; 28. Nozzle;

[0036] 3. Material conveying part; 31. Protective cover. Detailed Embodiment

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] In the description of the utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] In the description of the utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] Please refer to Figure 1-6 , the present utility model provides a technical solution: an extrusion head for a 3D printer applicable to granular materials, including a feeding part 1, a processing part 2, and a material conveying part 3.

[0041] The feeding part 1 is integrally connected to the processing part 2. The inside of the feeding part 1 is hollow, the top of the feeding part 1 is open, and the inside of the feeding part 1 is communicated with the inside of the processing part 2. A plurality of groups of material guiding and dispersing plates 11 are arranged at equal intervals up and down inside the feeding part 1.

[0042] The material guiding and dispersing plates 11 are inclined. The lengths of the plurality of groups of material guiding and dispersing plates 11 increase from top to bottom, and the edges of the plurality of groups of material guiding and dispersing plates 11 close to the auger blade 22 are located at the same vertical position. Specifically, the edges of the plurality of groups of material guiding and dispersing plates 11 far from the auger blade 22 are located at different vertical positions. When the granular materials fall from the top opening of the feeding part 1, the granular materials can fall onto different material guiding and dispersing plates 11, so as to more effectively guide the granular materials to move obliquely downward, effectively disperse the transportation of the materials, avoid the over-concentration of the materials, and reduce the problems of blockage and uneven material flow.

[0043] The bottom of the feeding part 1 is inclined, and a preheating electric hot plate 12 is arranged on the inclined part of the inner bottom of the feeding part 1. Specifically, the bottom of the feeding part 1 is inclined, which helps to convey the granular materials at the inner bottom of the feeding part 1 into the processing part 2. The preheating electric hot plate 12 can preheat the granular materials before they enter the processing part 2, thereby improving the printing efficiency and the stability of the material flow.

[0044] The inner side of the processing part 2 is hollow. A driving motor 21 is installed at the top of the processing part 2, and a nozzle 28 is fixedly connected to the bottom of the processing part 2. The motor shaft of the driving motor 21 passes through the top of the processing part 2 and is fixedly connected to an auger blade 22. The auger blade 22 is vertically arranged inside the processing part 2. The inner wall surface of the upper end of the processing part 2 is provided with a first electric hot plate 23. The second electric hot plate 24, a lower deflector 25, and an extrusion hot end 26 are fixedly arranged in sequence from top to bottom inside the lower end of the processing part 2. A third electric hot plate 27 is fixedly arranged inside the extrusion hot end 26.

[0045] Specifically, the driving motor 21 drives the auger blade 22 to continuously rotate, so as to convey the melted granular materials to the inner bottom of the processing part 2, and then the materials are conveyed to the nozzle 28 through the extrusion hot end 26 and ejected.

[0046] The pitch of the auger blade 22 decreases regularly from top to bottom. Specifically, such a change in pitch helps to apply different thrusts to the granular materials at different stages, thereby optimizing the material flow and extrusion efficiency. The auger blade 22 between each pitch in the upper part has a larger storage and transportation space.

[0047] The inclination angle of the blade of the auger blade 22 decreases regularly from top to bottom. Specifically, this design helps to reduce the resistance during the material flow process and improve the working efficiency of the extrusion head on the one hand. On the other hand, after shutdown, the blade of the auger blade 22 closer to the lower part has a more stable function of temporarily storing materials, effectively reducing the problem of material leakage.

[0048] Specifically, by setting the decreasing design of the pitch and inclination angle of the auger blade 22, the feeding mechanism is optimized. The granular materials can be fully heated to melt by multiple electric hot plates, the material flow process is optimized, the printing efficiency is improved, the printing speed is increased, it is more suitable for constructing large parts, helps to convey the melted granular materials to the nozzle 28 more evenly and stably, reduces the stripes on the surface of the printed object, thereby reducing the need for subsequent processing and improving the surface smoothness of the printed object.

[0049] The inner side of the lower deflector 25 is a frustum-shaped structure. Specifically, the frustum-shaped structure of the lower deflector 25 is designed to more smoothly guide the granular materials to the nozzle 28, making the printing process smoother, reducing the possibility of blockage of the nozzle 28, simplifying the maintenance work, reducing material leakage and improving the printing accuracy.

[0050] The material conveying part 3 is arranged directly above the feeding part 1, and a protective cover 31 is hingedly connected to the top of the material conveying part 3 for flipping.

[0051] Specifically, refer to the attached Figure 6 instruction manual, the material conveying part 3 can be fixed on the top of the printer.

[0052] Specifically, the extrusion head for a 3D printer applicable to granular materials does not require a traditional wire extrusion feeding mechanism, simplifies the structure of the extrusion head, and avoids the risks of wire jamming and wire breakage in the extrusion head of a traditional FDM printer.

[0053] Specifically, the extrusion head for a 3D printer applicable to granular materials effectively improves and solves the problem of material leakage after shutdown, reduces material waste, maintains the quality and appearance of the printed object, can better handle different types of granular materials, including those difficult to handle by traditional FDM printers, thereby expanding the material selection range of 3D printing.

[0054] 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 recorded in the foregoing embodiments, or perform equivalent substitution on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An extrusion head for a 3D printer applicable to pellet materials, characterized in that: It includes a feeding part (1), a processing part (2) and a material conveying part (3); The feeding part (1) is integrally connected to the processing part (2). The inside of the feeding part (1) is hollow, the top of the feeding part (1) is open, and the inside of the feeding part (1) is communicated with the inside of the processing part (2). A number of groups of guiding and dispersing plates (11) are arranged at equal intervals up and down inside the feeding part (1); The inside of the processing part (2) is hollow. A driving motor (21) is installed at the top of the processing part (2), and a nozzle (28) is fixedly connected to the bottom of the processing part (2). The motor shaft of the driving motor (21) passes through the top of the processing part (2) and is fixedly connected to an auger blade (22). The auger blade (22) is vertically arranged inside the processing part (2). A first electric heating plate (23) is provided on the inner wall surface at the upper end of the processing part (2). A second electric heating plate (24), a lower diversion block (25), and an extrusion hot end (26) are fixedly arranged in sequence from top to bottom inside the lower end of the processing part (2). A third electric heating plate (27) is fixedly arranged inside the extrusion hot end (26); The material conveying part (3) is arranged directly above the feeding part (1), and a protective cover (31) is connected to the top of the material conveying part (3) through a hinge for flipping; 2. The extrusion head for a 3D printer applicable to pellet materials according to claim 1, characterized in that: The bottom of the feeding part (1) is inclined, and a preheating electric heating plate (12) is arranged on the inclined part of the inner bottom of the feeding part (1); 3. The extrusion head for a 3D printer applicable to pellet materials according to claim 1, wherein: The guiding and dispersing plates (11) are inclined. The lengths of a number of groups of guiding and dispersing plates (11) increase from top to bottom, and the edges of a number of groups of guiding and dispersing plates (11) close to the auger blade (22) are located at the same vertical position; 4. The extrusion head for a 3D printer applicable to pellet materials according to claim 1, wherein: The pitch of the auger blade (22) decreases regularly from top to bottom in sequence; 5. The extrusion head for a 3D printer applicable to pellet materials according to claim 1, wherein: The blade inclination angle of the auger blade (22) decreases regularly from top to bottom in sequence; 6. The extrusion head for a 3D printer applicable to pellet materials according to claim 1, wherein: The inner side of the lower diversion block (25) is of a frustum-shaped structure;

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