High efficiency heating 3d printing head

Abstract

The utility model aims at providing a kind of high -efficient heating 3D printing head, including heating block and heat insulation component, heat insulation component includes inner tube and outer tube, inner tube is screwed on heating block, the outside wall of inner tube is provided with several interval distribution's contact block, the inner side wall of outer tube is provided with several clamping grooves, and the partial structure of each contact block is one-to-one corresponding with each clamping groove clamped, to make each contact block common support outer tube coaxially and be set on inner tube, and make the inner side wall of outer tube and the outside wall of inner tube form annular gap of two ends communication.

Description

Technical Field

[0001] This utility model relates to the technical field of 3D printing, and in particular to a high-efficiency heated 3D printing head. Background Technology

[0002] In the process of modern manufacturing transforming towards intelligent and personalized manufacturing, Fused Deposition Modeling (FDM) is one of the most widely used technologies in 3D printing. In existing FDM 3D print head structures, the throat is a key component for the transport and transition of filamentary material. One end is connected to the feeding mechanism to receive the filamentary printing material, while the other end connects to the nozzle, transporting the material into the nozzle cavity for heating and melting. During the heating process, to prevent heat from the heating module from being conducted to the throat and prematurely heating the printing material, which would cause the material to soften and accumulate inside the throat, existing solutions typically install a heat sink fin on the throat and a fan for cooling. This mitigates the throat problem and prevents the printing material from being preheated before entering the nozzle.

[0003] However, existing heating tubes have the following shortcomings in practical use: Because heating tubes are typically made of materials with good thermal conductivity, such as metal, and lack effective thermal insulation in their overall structure, a large amount of heat generated during heating module operation is rapidly conducted through the heating tube to the heat dissipation fins connected to it for cooling. To ensure that the material in the nozzle cavity reaches a stable melting temperature and meets printing process requirements, the heating module needs to continuously output more heat to compensate for the heat lost through the heating tube. This not only increases the energy consumption of the equipment and printing costs but also causes the heating module to operate under high load for extended periods, accelerating the aging and wear of internal components and shortening the lifespan of the heating module. Therefore, this application proposes a high-efficiency heated 3D printing head. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-efficiency heating 3D printing head that reduces heat loss and improves heating efficiency.

[0005] The objective of this utility model is achieved through the following technical solution: A high-efficiency heated 3D printing head, comprising: Heating blocks; and A heat insulation assembly includes an inner tube and an outer tube. The inner tube is screwed onto the heating block. A plurality of spaced-apart contact blocks are provided on the outer side wall of the inner tube. A plurality of slots are provided on the inner side wall of the outer tube. Parts of the structure of each contact block are engaged with each slot in a corresponding manner, so that each contact block together supports the outer tube to be coaxially fitted onto the inner tube, and an annular gap with both ends connected is formed between the inner side wall of the outer tube and the outer side wall of the inner tube.

[0006] Optionally, each of the contact blocks is distributed at an equal angle along the outer side wall of the inner tube, and each of the contact blocks is divided into at least two groups, with a gap between each of the contact blocks in the two groups, and each of the slots is respectively engaged with each of the contact blocks in each group.

[0007] Optionally, the outer tube includes a first clamping ring, a second clamping ring, and a ring tube. The ring tube is sleeved on the inner tube. Each of the slots is respectively opened on the first clamping ring and the second clamping ring, and each slot is respectively engaged with each group of contact blocks in a one-to-one correspondence.

[0008] Optionally, the inner diameters of the first clamping ring and the second clamping ring are smaller than the inner diameter of the ring tube, and the inner diameters of the first clamping ring and the second clamping ring are both larger than the outer diameter of the inner tube.

[0009] Optionally, the inner tube includes a smooth portion and a threaded portion, each of the contact blocks is located in the smooth portion, and the threaded portion is screwed to the heating block.

[0010] Optionally, the outer tube further includes a spiral tube, which is coaxially disposed on the first clamping ring and communicates with the first clamping ring. The heat insulation component further includes a heat dissipation block, which is screwed onto the spiral tube.

[0011] Optionally, the high-efficiency heated 3D printing head further includes a nozzle, which is screwed onto the heating block.

[0012] Compared with the prior art, the present invention has at least the following advantages: This invention relates to a high-efficiency heated 3D printing head. The smooth inner tube is equipped with several contact blocks (or strips) distributed at equal angles. Each contact block's end engages with a corresponding slot on a first and second clamping ring located at both ends of the annular tube. This point / line contact replaces surface contact, significantly reducing the contact area between the inner and outer tubes, weakening heat conduction at the source, and minimizing heat loss from the heating block to the outer tube. Furthermore, an annular gap (or perforation) connecting the inner and outer tubes creates a natural ventilation channel, allowing airflow to remove some heat. The heat sink and spiral tube work together to form "dual heat dissipation." The high thermal conductivity heat sink quickly dissipates residual heat through fins, while the insulation structure blocks heat conduction to non-heated areas, concentrating the heat from the heating block for material melting. This reduces heat loss and improves heating efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a high-efficiency heated 3D printing head according to one embodiment of the present invention; Figure 2 This is an exploded view of the high-efficiency heated 3D printing head according to one embodiment of the present invention. Figure 3 This is a schematic diagram of the cross-sectional structure of a high-efficiency heated 3D printing head according to one embodiment of the present invention; Figure 4 for Figure 3 A magnified schematic diagram of the structure of part A in the diagram; Figure 5 This is a structural schematic diagram of the ring pipe installation position according to one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the second clamping ring and the contact block engaging in one embodiment of the present invention; Figure 7 for Figure 6 A magnified schematic diagram of the partial structure of B in the diagram; Figure 8 This is a schematic diagram of the cross-sectional structure of the second clamping ring and the inner tube according to one embodiment of the present invention; Figure 9 This is a schematic diagram of the cross-sectional structure of the annular pipe and the inner pipe according to one embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the second clamping ring according to one embodiment of the present invention; Figure 11 This is a structural schematic diagram showing the contact strip setting position according to one embodiment of the present invention; Figure 12 for Figure 11 A magnified schematic diagram of the structure of C.

[0015] Explanation of reference numerals in the attached figures: 1. High-efficiency heated 3D printing head; 10. Heating block; 20. Inner tube; 200. Smooth part; 2000. Contact block; 201. Threaded part; 21. Outer tube; 210. First clamping ring; 2100. Slot; 211. Second clamping ring; 212. Ring tube; 22. Spiral tube; 30. Heat sink; 40. Nozzle; 50. Contact strip; 51. Perforation. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model.

[0017] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0020] like Figures 1 to 12As shown, in one embodiment, a high-efficiency heated 3D printing head 1 includes a heating block 10 and a heat insulation component. The heat insulation component includes an inner tube 20 and an outer tube 21. The inner tube 20 is screwed onto the heating block 10. A plurality of spaced contact blocks 2000 are provided on the outer side wall of the inner tube 20. A plurality of slots 2100 are provided on the inner side wall of the outer tube 21. Parts of the structure of each contact block 2000 are engaged with each slot 2100 in a corresponding manner, so that each contact block 2000 together supports the outer tube 21 to be coaxially fitted onto the inner tube 20, and an annular gap with both ends connected is formed between the inner side wall of the outer tube 21 and the outer side wall of the inner tube 20.

[0021] It should be noted that the inner tube 20 and the outer tube 21 are two coaxially assembled tubular structures. The inner tube 20 serves as the connecting carrier between the heat insulation component and the heating block 10. One end of the inner tube 20 is machined with an external thread structure, which is screwed and fixed to the heating block 10 through a corresponding internal thread hole, thereby achieving a stable assembly of the heat insulation component and the heating block 10. At the same time, on the outer wall of the inner tube 20, a number of contact blocks 2000 are uniformly and integrally formed along its circumference. Each contact block 2000 is... The outer tube 20 has a block-like structure protruding outward from its outer wall, with each contact 2000 having a consistent height and uniform spacing. The inner wall of the outer tube 21 has several slots 2100, each matching the shape and size of a contact 2000, corresponding to the positions of the contacts 2000. These slots allow the protruding structures of each contact 2000 to be inserted into the corresponding slots 2100, providing stable support to the outer tube 21. This ensures that the outer tube 21 can be coaxial with the inner tube 20. The outer tube 21 is positioned outside the inner tube 20, providing circumferential positioning between the outer tube 21 and the inner tube 20 to prevent relative rotation. Since the contact block 2000 only provides partial contact support, the inner wall of the outer tube 21 and the outer wall of the inner tube 20 will not be completely fitted together, thus forming an annular gap with both ends connected to the outside. In this way, the point contact of each contact block 2000 replaces surface contact, reducing the heat transfer area. The annular gap with both ends connected creates a natural ventilation channel, allowing outside air to flow within the gap and carry away the heat transferred from the inner tube 20 to the outer tube 21. This significantly reduces the conduction of heat from the heating block 10 to other non-heated areas of the printhead (such as the printhead drive components and mounting base). This ensures that the heat from the heating block 10 is concentrated for heating the printing material, improving heating efficiency, and prevents non-heated areas from aging components and experiencing performance degradation due to heat, extending the overall lifespan of the printhead. It also reduces energy waste caused by heat loss.

[0022] like Figures 2 to 4 , Figure 6 , Figures 8 to 9As shown, in one embodiment, each contact block 2000 is distributed at equal angles along the outer side wall of the inner tube 20, and each contact block 2000 is divided into at least two groups, with a gap between each contact block 2000 in the two groups, and each slot 2100 is respectively engaged with each group of contact blocks 2000 in a one-to-one correspondence.

[0023] It should be noted that the contacts 2000 are distributed at equal angular intervals along the circumferential direction of the outer wall of the inner tube 20 to ensure that the contacts 2000 are subjected to balanced force in the circumferential direction. At the same time, all contacts 2000 are divided into at least two groups, such as upper and lower groups along the axial direction of the inner tube 20. Each group contains several contacts 2000 distributed at equal angular intervals in the circumferential direction. A certain interval is maintained between groups along the axial direction of the inner tube 20. Correspondingly, each slot 21 on the inner wall of the outer tube 21... The contacts 2000 are also distributed in the same number and position as the contact blocks 2000. Each group of slots 2100 is respectively engaged with a corresponding group of contact blocks 2000 on the inner tube 20. That is, each contact block 2000 in a group is embedded in a corresponding slot 2100 on the inner side wall of the outer tube 21, achieving a precise fit between each group of contact blocks 2000 and slot 2100. In this way, the circumferentially equidistant distribution of the contact blocks 2000 allows the inner tube 20 to support the outer tube 21 during installation. The force is evenly applied to all directions of the inner wall of the outer tube 21, preventing eccentricity and tilting of the outer tube 21 due to uneven support force. This further ensures the coaxiality of the inner tube 20 and the outer tube 21. Dividing the contact blocks 2000 into at least two groups with intervals between them extends the axial support range of the contact blocks 2000 relative to the outer tube 21, ensuring stable support for the outer tube 21 at different axial positions. This effectively prevents swaying problems caused by the long axial length of the outer tube 21, improving the overall structural stability of the insulation component. Furthermore, the intervals between the groups, in conjunction with the intervals of the contact blocks 2000 themselves, further increase the ventilation area of ​​the annular gap between the inner tube 20 and the outer tube 21, allowing for smoother airflow and higher heat dissipation efficiency. This also reduces the stress load on individual contact blocks 2000, minimizing the risk of deformation and breakage due to excessive long-term stress, and extending the service life of the insulation component. like Figures 2 to 5 , Figure 12 As shown, in one embodiment, the outer tube 21 includes a first clamping ring 210, a second clamping ring 211 and a ring tube 212. The ring tube 212 is sleeved on the inner tube 20. Each slot 2100 is respectively opened on the first clamping ring 210 and the second clamping ring 211. Each slot 2100 is respectively engaged with each group of contact blocks 2000.

[0024] It should be noted that the first clamping ring 210 and the second clamping ring 211 have the same structure. The first clamping ring 210, the second clamping ring 211, and the ring tube 212 are made of high-temperature resistant and low thermal conductivity materials (such as ceramics, high-temperature resistant plastics, etc.). The ring tube 212 is a hollow tubular structure, and its inner diameter is adapted to the overall contour formed by the outer wall of the inner tube 20 and the contact block 2000. The ring tube 212 can be directly sleeved on the outside of the inner tube 20. After sleeved, the inner wall of the ring tube 212 and the outer wall of the inner tube 20 form an annular gap through the contact block 2000. The first clamping ring 210 and the second clamping ring 211 are both annular structures. The first clamping ring 210 and the second clamping ring 211 are respectively assembled at both ends of the axial direction of the ring tube 212. (e.g., fixed to both ends of the ring tube 212 by means of snap-fit ​​connection or threaded connection). Each slot 2100 is respectively opened on the inner side wall of the first clamping ring 210 and the inner side wall of the second clamping ring 211. The number and position of the slots 2100 on the inner side wall of the first clamping ring 210 correspond one-to-one with one set of contact blocks 2000 on the inner tube 20, and the number and position of the slots 2100 on the inner side wall of the second clamping ring 211 correspond one-to-one with another set of contact blocks 2000 on the inner tube 20. During assembly, each slot 2100 on the inner side wall of the first clamping ring 210 is engaged with the corresponding set of contact blocks 2000, and each slot 2100 on the inner side wall of the second clamping ring 211 is engaged with the other set of contact blocks 2000, thereby realizing the external... The outer tube 21 is stably connected to the inner tube 20. Thus, the outer tube 21, through the separate structure of the first clamping ring 210, the second clamping ring 211, and the ring tube 212, reduces the processing difficulty of the outer tube 21. It eliminates the need to machine the groove 2100 as a whole on the inner wall of the long, narrow ring tube 212; instead, it only needs to machine the groove 2100 on the inner side of the two short, ring-shaped clamping rings. This reduces processing errors, improves the accuracy of the groove 2100 machining, and ensures compatibility with the contact block 2000. Furthermore, the separate design facilitates the assembly and maintenance of the outer tube 21. If the groove 2100 is worn or the ring tube 212 is damaged, the first clamping ring 210, the second clamping ring 211, or the ring tube 212 can be replaced individually. 12. The outer tube 21 does not need to be replaced entirely, reducing maintenance costs. At the same time, the first clamping ring 210 and the second clamping ring 211 are respectively engaged with the inner tube 20 contact block 2000 at both ends of the ring tube 212, which can form an axial limit on the ring tube 212 and prevent the ring tube 212 from sliding and shifting along the axial direction of the inner tube 20 during use, further improving the stability of the assembly of the outer tube 21 and the inner tube 20. In addition, the combination structure of the clamping ring and the ring tube 212 can flexibly adjust the length of the ring tube 212 according to actual needs. Only by replacing the ring tube 212 of different lengths, it can be adapted to the spacing between the inner tube 20 and the contact block 2000 groups of different axial lengths, enhancing the versatility and flexibility of the outer tube 21 structure.

[0025] like Figures 3 to 6 , Figures 8 to 9As shown, in one embodiment, the inner diameters of the first clamping ring 210 and the second clamping ring 211 are smaller than the inner diameter of the ring tube 212, and the inner diameters of the first clamping ring 210 and the second clamping ring 211 are both larger than the outer diameter of the inner tube 20.

[0026] It should be noted that the inner diameters of the first clamping ring 210 and the second clamping ring 211 are consistent, and both are smaller than the inner diameter of the ring tube 212. This results in the diameter of the hollow channel formed by the inner wall of the ring tube 212 being larger than the diameter of the hollow channel formed by the inner walls of the first clamping ring 210 and the second clamping ring 211. Simultaneously, the inner diameters of both the first clamping ring 210 and the second clamping ring 211 are larger than the outer diameter of the inner tube 20, resulting in the diameter of the outer wall of the inner tube 20 being smaller than the diameter of the hollow channel formed by the inner walls of the first clamping ring 210 and the second clamping ring 211. The channel diameter is specified. The first clamping ring 210 and the second clamping ring 211 are fixed to the axial ends of the annular tube 212 by means of snap-fit ​​connection or threaded connection, respectively. Both have grooves 2100 on their inner sidewalls that engage with the corresponding contact blocks 2000 of the inner tube 20. This ensures that when the clamping rings are fixed to the ends of the annular tube 212, their inner sidewalls form a certain "recessed" structure relative to the inner sidewall of the annular tube 212. This prevents the annular gap between the inner side of the annular tube 212 and the inner tube 20 from being blocked, thus ensuring unobstructed airflow within the gap. It should be noted that each contact block 2000 is divided into three groups, with a gap between the three groups. For ease of description, the three groups of contact blocks 2000 are defined as the first group, the second group, and the third group according to their arrangement order. Parts of the structure of the first group and the structure of the third group are respectively engaged with the slots 2100 on the first clamping ring 210 and the second clamping ring 211. The second group abuts against the inner sidewall of the outer tube 21 along the circumference. In this way, at least three layers of support are formed inside the ring tube 212 to prevent the ring tube 212 from radially deforming due to external impact or long-term use, and further enhance the stability of the ring tube 212 assembly. The inner diameters of the first clamping ring 210 and the second clamping ring 211 are larger than the outer diameter of the inner tube 20, so that only the part of the structure of each contact block 2000 away from the inner tube 20 engages with each slot 2100. This also creates a gap between the inner wall of the first clamping ring 210 and the second clamping ring 211 and the outer wall of the inner tube 20, allowing the two ends of the gap between the ring tube 212 and the inner tube 20 (which has an inward-curving structure) to communicate with the external environment. In this way, partial contact is achieved through the contact blocks 2000, reducing the heat transfer area and decreasing the heating efficiency of the heating block 10.

[0027] like Figure 2 , Figure 6 , Figures 11 to 12 As shown, in one embodiment, the inner tube 20 includes a smooth portion 200 and a threaded portion 201. Each contact block 2000 is located in the smooth portion 200, and the threaded portion 201 is screwed to the heating block 10.

[0028] It should be noted that the contact blocks 2000 are all integrally formed or fixedly installed on the outer wall of the smooth part 200 by welding or other stable methods. The threaded part 201 is tightly screwed to the heating block 10 to facilitate the disassembly, maintenance or replacement of the inner tube 20 in the future. The smooth surface of the smooth part 200 can reduce heat dissipation to the outside, so as to avoid excessive heat accumulation in the gap between the outer tube 21 and the inner tube 20, thereby reducing the heat transfer of the inner tube 20.

[0029] like Figures 2 to 3 , Figure 11 As shown, in one embodiment, the outer tube 21 further includes a spiral tube 22, which is coaxially disposed on the first clamping ring 210 and communicates with the first clamping ring 210. The heat insulation component also includes a heat dissipation block 30, which is screwed onto the spiral tube 22.

[0030] It should be noted that the heat sink 30 is made of a material with excellent thermal conductivity (such as aluminum alloy, copper alloy, etc.), and its interior has a threaded hole adapted to the screw tube 22. The threaded hole penetrates the heat sink 30, making the heat sink 30 a block structure with a hollow channel. At the same time, the outer wall of the heat sink 30 can be machined with several radially extending heat dissipation fins (the fins are evenly spaced to increase the heat dissipation area). Furthermore, the screw tube 22 is a hollow tube with threads machined on its outer wall, and the screw tube 22 is coaxially fixed with the first clamping ring 210 (e.g., integrally formed or welded). And so on), and the screw tube 22 is connected to the first clamping ring 210; the heat sink 30 is screwed and fixed to the screw tube 22 through its internal threaded hole. After screwing, the heat sink 30 and the screw tube 22 are coaxial, and the hollow channel of the heat sink 30 is connected to the hollow channel of the screw tube 22 and the hollow channel of the first clamping ring 210. The end of the inner tube 20 away from the heating block 10 can extend into the hollow channel of the heat sink 30; in this way, the screwing connection between the heat sink 30 and the screw tube 22 allows the heat sink 30 to be quickly assembled and disassembled, which is convenient for changing different specifications according to printing needs in the later stage. The use of heat sinks 30 (with different heat dissipation areas and materials) enhances the flexibility and maintainability of the components. Heat sinks 30 utilize highly thermally conductive materials and are equipped with heat dissipation fins, efficiently absorbing heat transferred from the inner tube 20 and the spiral tube 22, and quickly dissipating the heat to the outside air through the fins. This, combined with the annular gap between the inner tube 20 and the outer tube 21 for ventilation and heat dissipation, forms a "dual heat dissipation" structure, significantly improving the heat dissipation efficiency of the heat insulation components. This further reduces the conduction of heat from the heating block 10 to non-heated areas of the printhead (such as the feeding components and drive components), preventing heat loss to non-heated areas. The heat-generating components may age or degrade due to heat. Meanwhile, the block structure of the heat sink 30 can provide stable support for the end of the spiral tube 22 and the inner tube 20 away from the heating block 10. Combined with the first clamping ring 210 limiting the ring tube 212, the axial structural stability of the entire heat insulation assembly is significantly enhanced, preventing the inner tube 20 and the spiral tube 22 from shifting due to long-term stress or vibration. In addition, the hollow channel of the heat sink 30 is connected to the channels of each component, which will not obstruct the airflow and printing material delivery. While strengthening heat dissipation and structural support, it ensures the normal operation of the print head.

[0031] like Figures 1 to 3 , Figure 11 As shown, in one embodiment, the high-efficiency heated 3D printing head 1 further includes a nozzle 40, which is screwed onto the heating block 10.

[0032] It should be noted that the nozzle 40 is made of a high-temperature resistant, wear-resistant material with excellent thermal conductivity (such as brass, stainless steel, or ceramic). It has an overall conical structure, with a connecting section with external threads at one end and an extrusion section with a gradually narrowing diameter at the other end. The nozzle 40 has a material channel inside that runs through the connecting section and the extrusion section, and the channel diameter gradually decreases from the connecting section to the extrusion section. The heating block 10 is screwed to the threaded part 201 of the inner tube 20 on one side through internal threads, and screwed to the nozzle 40 on the other side, forming a complete material conveying path from the heat sink 30, the spiral tube 22, the inner tube 20 to the heating block 10. In this way, the printing material can pass through the heat sink 30, the spiral tube 22, the inner tube 20 to the heating block 10 in sequence, and be extruded from the nozzle 40 after being heated by the heating block 10.

[0033] like Figures 11 to 12 As shown, in one embodiment, the contact block 2000 is a long strip structure, and each contact block 2000 is arranged on the outer side wall of the inner tube 20 along the circumferential direction.

[0034] It should be noted that, for the sake of distinction, the elongated contact block 2000 is defined as contact strip 50. Each contact strip 50 is distributed at equal angles along the circumference and extends along the axial direction of the inner tube 20, so that each contact strip 50 and the inner tube 20 form a gear-like structure. The end face of each contact strip 50 away from the inner tube 20 abuts against the inner wall of the outer tube 21, so that a number of circumferentially distributed perforations 51 are formed between the inner wall of the outer tube 21 and the outer wall of the inner tube 20. The two ends of each contact strip 50 extend from both sides of the ring tube 212, and part of the structure of each contact strip 50 is engaged with the slots 2100 on the first clamping ring 210 and the second clamping ring 211, so that the two ends of each perforation 51 are connected to the external environment. In this way, the heat transfer area is reduced by replacing surface contact with line contact of each contact strip 50, and the perforations 51 connected at both ends form multiple natural ventilation channels. Outside air can flow in each perforation 51 and carry away the heat transferred from the inner tube 20 to the outer tube 21, thereby significantly reducing the conduction of heat from the heating block 10 to other non-heated areas of the printhead (such as the printhead drive components, mounting base, etc.), ensuring that the heat from the heating block 10 is concentrated for heating the printing material and improving heating efficiency.

[0035] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high-efficiency heated 3D printing head, characterized in that, include: Heating block; and A heat insulation assembly includes an inner tube and an outer tube. The inner tube is screwed onto the heating block. A plurality of spaced-apart contact blocks are provided on the outer side wall of the inner tube. A plurality of slots are provided on the inner side wall of the outer tube. Parts of the structure of each contact block are engaged with each slot in a corresponding manner, so that each contact block together supports the outer tube to be coaxially fitted onto the inner tube, and an annular gap with both ends connected is formed between the inner side wall of the outer tube and the outer side wall of the inner tube.

2. The high-efficiency heated 3D printing head according to claim 1, characterized in that, Each of the contact blocks is distributed at an equal angle along the outer side wall of the inner tube, and each of the contact blocks is divided into at least two groups, with a gap between each of the contact blocks in the two groups. Each of the slots is respectively engaged with each of the contact blocks in each group.

3. The high-efficiency heated 3D printing head according to claim 2, characterized in that, The outer tube includes a first clamping ring, a second clamping ring, and a ring tube. The ring tube is sleeved on the inner tube, and each of the slots is respectively opened on the first clamping ring and the second clamping ring.

4. The high-efficiency heated 3D printing head according to claim 3, characterized in that, The inner diameters of the first clamping ring and the second clamping ring are smaller than the inner diameter of the ring tube, and the inner diameters of the first clamping ring and the second clamping ring are both larger than the outer diameter of the inner tube.

5. The high-efficiency heated 3D printing head according to claim 4, characterized in that, The inner tube includes a smooth portion and a threaded portion, each of the contact blocks is located in the smooth portion, and the threaded portion is screwed to the heating block.

6. The high efficiency heated 3D printing head of claim 4, wherein, The outer tube also includes a spiral tube, which is coaxially disposed on the first clamping ring and communicates with the first clamping ring. The heat insulation component also includes a heat dissipation block, which is screwed onto the spiral tube.

7. The high-efficiency heated 3D printing head according to claim 6, characterized in that, The high-efficiency heated 3D printing head also includes a nozzle, which is screwed onto the heating block.

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