3D printing induction heating nozzle

Abstract

The invention provides a 3D printing induction heating sprayer which comprises a water cooling block and a nozzle, and a wire feeding channel is vertically formed in the water cooling block; the nozzle is detachably installed on the lower side of the water cooling block and communicates with the wire feeding channel. The induction heating coil is coaxially arranged on the peripheral side of the nozzle in a sleeving mode, and an annular air supply channel is formed between the induction heating coil and the nozzle; an air outlet of the annular air supply channel faces a preset circular area below the nozzle or faces the induction heating coil; the double-layer supporting piece is arranged to support the induction heating coil on the periphery of the nozzle, the annular air supply channel is formed between the induction heating coil and the nozzle, the cooling capacity of a printed model is improved, meanwhile, the arrangement difficulty of the air supply channel is effectively reduced, and the upper limit of the temperature heating capacity of the 3D printer nozzle is remarkably improved; and the induction heating coil is low in overheating short circuit risk, long in service life and beneficial to cost reduction and efficiency improvement of enterprises.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and more particularly to a 3D printing induction heating nozzle. Background Technology

[0002] In recent years, as an emerging rapid prototyping technology, 3D printing has been widely used in various aspects of production and life due to its advantages such as rapid prototyping, compatibility with multiple materials, personalization customization, and low cost.

[0003] Currently, with the rise in demand for high-performance material printing and the continuous increase in printing speed, the requirements for cooling efficiency of printed models are also increasing. Related industries tend to improve cooling efficiency by installing large-size, high-power cooling fans near the nozzle, reducing the fan intake temperature, lowering airflow resistance, and concentrating the cooling airflow direction. However, in these technologies, since the nozzle needs to operate within the heating chamber, installing large-size fans shortens the nozzle's travel in the X and Y directions, resulting in limited space for the printed model. For high-performance material 3D printers with high chamber temperatures, the air temperature near the nozzle is heated by the chamber (>80℃), making it difficult to obtain low-temperature airflow. Moreover, as is well known, the nozzle area of ​​3D printers is mostly compact and has limited space, and includes a large heat spreader for heating the hot end of the nozzle. The airflow from the cooling fan usually needs to bypass the heat spreader through a complex airflow path before being guided to the vicinity of the nozzle, resulting in significant pressure loss and difficulty in concentrating the airflow direction. In summary, the applicable scope and cooling capacity of the printed model cooling methods in these technologies are limited, and their deployment is difficult, requiring further improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a 3D printing induction heating nozzle that, by optimizing its heating method and cooling air duct structure, improves the cooling capacity of the printed model while effectively reducing its production and deployment difficulty, and ensuring the applicability of the corresponding 3D printer.

[0005] The technical solution provided by this invention is as follows: This invention provides a 3D printing induction heating nozzle, comprising: The water-cooled block has a vertical wire feeding channel inside; The nozzle is installed on the lower side of the water-cooled block and is connected to the wire feeding channel; An induction heating coil is coaxially sleeved around the nozzle, naturally forming an annular air supply channel between the coil and the nozzle; the outlet of the annular air supply channel faces a preset circular area below the nozzle or towards the induction heating coil. The water-cooled block is provided with a cooling air duct, the outlet of the cooling air duct is connected to the annular air supply channel, and the inlet of the cooling air duct is connected to a ventilation source.

[0006] This invention provides a 3D printing induction heating nozzle. Firstly, it uses an induction heating coil to heat the hot end of the nozzle, replacing the "heating rod combined with a heat spreader block" scheme in related technologies. Because the induction heating coil has a simple structure and is coaxially positioned relative to the nozzle, a straight and unobstructed annular airflow channel naturally forms between the coil and the nozzle. This achieves direct airflow, reduces air pressure loss, and effectively reduces the volume of the hot end of the nozzle, thus ensuring the nozzle's travel in the X and Y directions. The printing model's forming space is no longer limited, allowing the 3D printer to be suitable for printing models of a wider range of sizes, effectively guaranteeing its applicability and enhancing its practicality. Simultaneously, the annular airflow channel layout is simpler, making production and assembly easier and less costly. Secondly, a cooling duct connected to the inlet of the annular airflow channel is located within a water-cooled block. The cooling water circulation system within the water-cooled block cools the airflow blown out by the air source, or the inlet of the cooling duct can be directly connected to a low-temperature air source, making it easy to obtain low-temperature cooling airflow. This significantly improves the cooling capacity for the printed model.

[0007] Meanwhile, by actively controlling the temperature of the water-cooled block (i.e., the cold end of the nozzle), the cooling intensity can be automatically controlled, resulting in a wide cooling airflow temperature range, which helps to further improve the applicability of the corresponding 3D printer. Furthermore, this shortens the nozzle cooling response time and significantly improves material leakage issues. In addition, the annular airflow channel also serves to assist in isolating the heat source of the induction heating coil, effectively reducing the risk of overheating and short circuits in the induction heating coil, and helping to extend the overall service life. In summary, this 3D printing induction heating nozzle exhibits excellent overall performance and low cost, effectively promoting cost reduction and efficiency improvement for enterprises.

[0008] In some embodiments, a support member is also included, which is coaxially sleeved on the nozzle from bottom to top and detachably connected to the water-cooling block, while the nozzle is detachably mounted on the water-cooling block. The induction heating coil is mounted on the support member.

[0009] The present invention provides a 3D printing induction heating nozzle, which uses a support component to achieve a detachable connection between the induction heating coil, the nozzle and the water cooling block. The 3D printing induction heating nozzle has an ingenious structure and is easy to assemble, which helps to improve the ease of assembly of the 3D printing induction heating nozzle and thus improve its production efficiency.

[0010] In some embodiments, the support member includes a double-layer support sleeve, the double-layer support sleeve including a first cylinder and a second cylinder that are coaxially arranged from the inside out and fixedly connected, and the induction heating coil is coaxially arranged on the second cylinder, so that the annular air supply channel is formed between the first cylinder and the second cylinder. The first cylinder has an inner edge formed inward along its own radial direction, and the second cylinder has an outer edge formed outward along its own radial direction; The nozzle, along its own axial direction from bottom to top, includes a small-diameter section and a large-diameter section. When the support member is fitted with the nozzle from bottom to top, the inner edge coaxially abuts against the lower end face of the large diameter section from bottom to top, so that when the outer edge is detachably installed on the lower side of the water-cooling block, the inlet of the nozzle connects to the wire feeding channel from bottom to top, and the inlet of the annular air supply channel connects to the cooling air duct.

[0011] This invention provides a 3D-printed induction heating nozzle with a double-layer support sleeve structure. The induction heating coil is coaxially mounted on the second sleeve, naturally forming an annular air supply channel between the first and second sleeves. Integrating the annular air supply channel with the support sleeve effectively improves the overall integration of the 3D-printed induction heating nozzle, facilitating its miniaturization. Simultaneously, the inner and outer edge structures of the support sleeve enable rapid assembly of the nozzle and itself on the underside of the water-cooling block. The support sleeve structure is simple, easy to produce and assemble, and further helps enterprises reduce costs and increase efficiency.

[0012] In some embodiments, the support member further includes a support ring, which is coaxially and detachably disposed on the inner wall surface of the second cylinder and spaced apart from both the first cylinder and the second cylinder. The induction heating coil is coaxially sleeved on the outer wall surface of the support ring; The annular air supply channel is formed between the inner wall of the support ring and the outer wall of the first cylinder.

[0013] The present invention provides a 3D printing induction heating nozzle, which uses a support ring to achieve a detachable setting of the induction heating coil relative to the second cylinder. The components of the 3D printing induction heating nozzle are modularly designed, the induction heating coil layout is simple, production and assembly are convenient, and maintenance and replacement are easy, which helps to promote energy conservation and cost reduction for enterprises.

[0014] In some embodiments, the support ring includes a body and a mounting section coaxially connected from bottom to top, and the radial dimension of the body is larger than the radial dimension of the induction heating coil; The mounting section slides and engages with the inner wall of the second cylinder along the axis of the second cylinder; the induction heating coil is coaxially sleeved on the outer wall of the main body, and a heat dissipation space is formed between the induction heating coil and the inner wall of the second cylinder; The upper end of the mounting section is formed with a pressing edge along its own radial direction. The pressing edge is used to abut against the upper end face of the second cylinder when the mounting section is coaxially slid and embedded in the second cylinder from top to bottom.

[0015] The present invention provides a 3D printing induction heating nozzle, which, by setting the radial dimensions of the body and the mounting section and cooperating with the pressing edge structure at the upper end of the mounting section, achieves stable suspension of the induction heating coil between the first cylinder and the second cylinder, effectively ensuring the ease of installation of the induction heating coil.

[0016] In some embodiments, the lower end of the support ring extends radially outward with a support ring; The lower end of the induction heating coil abuts against the upper end face of the support ring.

[0017] The present invention provides a 3D printed induction heating nozzle, wherein a support ring is used to prevent the induction heating coil from falling off the support ring, thereby improving the overall structural stability of the 3D printed induction heating nozzle.

[0018] In some embodiments, the lower end of the second cylinder is provided with a sealing plate, and the lower end of the first cylinder and the lower end of the second cylinder are sealed and fixedly connected by the sealing plate; The lower end of the support ring is spaced apart from the sealing plate so that the annular air supply channel connects to the heat dissipation space; An air outlet is provided in the middle of the second cylinder, corresponding to the position of the heat dissipation space.

[0019] This invention provides a 3D printing induction heating nozzle. In practical applications, the cooling airflow in the annular air supply channel enters the heat dissipation space through the gap between the lower end of the support ring and the sealing plate, cooling the induction heating coil within the heat dissipation space. The airflow then exits the heat dissipation space through the air outlet, thus assisting in the rapid cooling of the induction heating coil. Simultaneously, the annular air supply channel and its internal cooling airflow isolate the induction heating coil from the isolation nozzle, effectively reducing the risk of overheating and short circuits in the induction heating coil. The corresponding cooling system boasts high cooling efficiency, excellent effect, and strong safety. Furthermore, the overall structure is simple, easy to deploy, and helps to stably promote cost reduction and efficiency improvement for enterprises.

[0020] In some embodiments, the lower end of the second cylinder is provided with a sealing plate; the sealing plate is inclined toward the nozzle near the side edge of the first cylinder and forms an air guide plate; The lower end of the first cylinder is connected to the air guide plate by a plurality of spaced connecting pieces, so that an air outlet is formed between the air guide plate and the lower end of the first cylinder. The lower end of the support ring abuts against the end of the sealing plate near the air guide plate, so that the annular air supply channel is connected to the air outlet.

[0021] The present invention provides a 3D printing induction heating nozzle. In practical applications, the cooling airflow in the annular air supply channel is blown out through the air outlet and, under the action of the air guide plate, is concentrated and blown towards a preset circular area below the nozzle, thereby achieving uniform heat dissipation for the printed model. By forming the air guide plate on the sealing plate and setting the lower end of the support ring to abut against the sealing plate, the design of "low resistance and concentrated direct blowing" of the cooling airflow can be achieved. While ensuring the cooling effect on the printed model, it effectively ensures the convenience of the layout of the annular air supply channel and the air outlet.

[0022] In some embodiments, a water-cooling channel is provided inside the water-cooling block surrounding the wire feeding channel; The water-cooling channel is arranged in parallel with the cooling air duct.

[0023] The present invention provides a 3D printing induction heating nozzle in which the cooling air duct and the water cooling channel in the water cooling block are arranged in parallel, which helps to ensure the cooling effect of the cold end of the nozzle on the airflow in the cooling air duct.

[0024] In some embodiments, the cooling duct is provided with a heat exchange structure for cooling the airflow from the air source to the annular air supply channel.

[0025] The present invention provides a 3D printing induction heating nozzle that integrates a heat exchange structure in the cooling air duct, which helps to further reduce the temperature of the cooling airflow, thereby ensuring a stable cooling effect on the printed model during the printing process.

[0026] Compared with the prior art, the 3D printing induction heating nozzle provided by the present invention has at least one of the following beneficial effects: 1. This invention opens parallel water-cooling channels on the water-cooling block, or integrates a heat exchange structure in the cooling air duct, while ensuring the low temperature of the water-cooling block, i.e. the cold end of the printhead, and reducing the intake temperature of the cooling airflow, and reducing the printhead volume and its occupation of printing space; the corresponding cooling air duct structure is ingenious and multi-functional, effectively promoting cost reduction and efficiency improvement for enterprises.

[0027] 2. In this invention, the induction heating coil is mounted on a support ring, which is detachably connected to a double-layer support sleeve. The double-layer support sleeve is also detachably connected to the nozzle and water-cooling block. In practical applications, by switching between double-layer support sleeves with air outlets or air inlets as needed, the corresponding cooling of the induction heating coil or the printed model can be achieved. Furthermore, by replacing double-layer support sleeves with guide plates of different tilt angles according to the required molding material, the 3D printing induction heating nozzle can be adapted to different sized printed models, further expanding its applicability. This 3D printing induction heating nozzle is easy to assemble, has a wide range of applications, is highly practical, and effectively ensures a good user experience.

[0028] 3. The 3D printing induction heating nozzle of the present invention has high overall integration, occupies little space, and hardly affects the X and Y direction travel of the nozzle, making it suitable for printing models of a large range of sizes and effectively ensuring the applicability of the nozzle. Attached Figure Description

[0029] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this solution.

[0030] Figure 1 This is a side view of the overall structure of the 3D printing induction heating nozzle, which is the main feature of this embodiment of the invention. Figure 2 This is a schematic diagram illustrating one possible configuration of the support member in an embodiment of the present invention. Figure 3 This is a schematic diagram illustrating another configuration of the support member in an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating the principle of a cooling duct with a heat exchange structure, which is a key feature of this invention. Figure 5 This is a top view of the overall structure of the 3D printing induction heating nozzle, which is the main embodiment of the present invention. Figure 6 yes Figure 5 The cross-sectional view along the GG direction is mainly used to illustrate one of the configurations of the support component; Figure 7 yes Figure 5 The cross-sectional view along the GG direction is mainly used to illustrate another form of support structure. Figure 8 This is an isometric view of the overall structure of the 3D printing induction heating nozzle, which is a key feature of this embodiment of the invention. Figure 9 , Figure 10 This is a side view that mainly illustrates the air vent configuration of this embodiment of the invention.

[0031] Explanation of reference numerals in the attached figures: 1. Water-cooled block; 11. Wire feeding channel; 12. Cooling air duct; 13. Water-cooled channel; 2. Nozzle; 21. Small diameter section; 22. Large diameter section; 23. Reduction diameter section; 3. Induction heating coil; 4. Annular air supply channel; 5. Heat exchange structure; 6. Support component; 61. Double-layer support sleeve; 611. First cylinder; 6111. Inner edge; 612. Second cylinder; 6121. Outer edge; 613. Sealing plate; 62. Support ring; 621. Body; 6211. Support ring; 622. Mounting section; 6221. Pressing edge; 7. Heat dissipation space; 8. Air guide plate; 81. Air outlet; 9. Air outlet. Detailed Implementation

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0033] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0034] In related technologies, cooling fans are typically installed near the nozzle of 3D printers to force heat dissipation from the extruded material, enabling it to cool and solidify rapidly, thus solving problems such as warping, interlayer collapse, and overhang collapse. In recent years, with the rise in demand for printing high-performance materials (such as PEEK, PEEK-CF, etc.) and the continuous improvement of printing speed, the requirements for model cooling efficiency have also increased. Currently, most industry solutions to improve model cooling involve replacing fans with higher-powered ones, reducing fan intake temperature, and lowering cooling airflow resistance to concentrate airflow direction. However, since the nozzle operates within the heating chamber, installing large fans encroaches on the nozzle's X and Y travel, limiting the model's forming space. Furthermore, in 3D printing scenarios with high chamber temperatures, the air near the nozzle is heated by the chamber (>80°C), making it difficult to lower the fan intake temperature. Moreover, the hot end area of ​​3D printer nozzles is often compact, with limited space and a large heat spreader. The airflow from the cooling fan must bypass the heat spreader through complex ducts before being guided to the nozzle, resulting in significant pressure loss and difficulty in concentrating the airflow direction. Therefore, the industry urgently needs to develop a highly integrated 3D printing induction heating nozzle with strong model cooling capabilities and easy deployment to promote further development in this field.

[0035] In one embodiment, reference is made to the accompanying drawings. Figures 1 to 10This invention provides a 3D printing induction heating nozzle, comprising a water-cooled block 1 and a nozzle 2 vertically mounted on its lower side. The water-cooled block 1 has a filament feeding channel 11 and a cooling air duct 12. The filament feeding channel 11 is located in the middle of the water-cooled block 1. The inlet of the nozzle 2 is connected to the outlet of the filament feeding channel 11. The inlet of the cooling air duct 12 is connected to a ventilation source. To heat the hot end of the nozzle, this embodiment also includes an induction heating coil 3. The induction heating coil 3 is coaxially sleeved on the periphery of the nozzle 2, and naturally forms an annular air supply channel 4 between it and the outer wall of the nozzle 2. The inlet of the annular air supply channel 4 is connected to the outlet of the cooling air duct 12. The outlet of the annular air supply channel 4 is directed towards a preset circular area below the nozzle 2 to cool the printed model, or towards the induction heating coil 3 to cool the induction heating coil 3, depending on the cooling requirements.

[0036] In practical applications, depending on the actual situation, a cooling fan, a normal-temperature high-pressure air pump, etc., can be set as the air source, and then connected to the air source through a hose. During specific operations, the air source is turned on to provide cooling airflow to the cooling air duct 12 for cooling the printed model or the induction heating coil 3. After entering the cooling air duct 12, the cooling airflow undergoes sufficient heat exchange through the cooling water circulation system in the water-cooling block 1, and after being sufficiently cooled, it flows into the annular air supply channel 4 between the induction heating coil 3 and the outer wall of the nozzle 2, forming a uniform annular airflow, and then blows out evenly from the outlet of the annular air supply channel 4. When printing printing materials that require auxiliary cooling, the outlet of the annular air supply channel 4 faces the preset circular area below the nozzle 2 to efficiently cool the corresponding printed model. When printing printing materials that do not require auxiliary cooling, the outlet of the annular air supply channel 4 faces the direction of the induction heating coil to efficiently cool the induction heating coil 3.

[0037] In one embodiment, based on the above embodiments, specifically referring to... Figure 2 and Figure 3 As is well known in the industry, a water-cooling channel 13 is typically formed around the wire feeding channel 11 within the water-cooled block 1. The cooling water circulation system within the water-cooling channel 13 is used to cool the wire feeding channel 11 and the printing material within it, forming the cold end of the printhead. In this embodiment, to improve the heat exchange efficiency of the cooling airflow at the cold end of the printhead, the cooling duct 12 is preferably formed inside the water-cooled block 1 and arranged parallel to the water-cooling channel 13. In embodiments of the present invention, a heat exchange structure 5 can also be provided within the cooling duct 12 of the water-cooled block 1. The heat exchange structure 5 is used to further cool the cooling airflow passing through the cooling duct 12, ensuring a stable low-temperature cooling airflow is provided to the annular air supply channel 4. Of course, referring to… Figure 4 In an embodiment of the present invention, the cooling air duct 12 may also be provided on the outer wall of the water-cooled block 1. For example, a shell is provided on the outer wall of the water-cooled block 1, and the cooling air duct 12 is formed between the shell and the outer wall of the water-cooled block 1. In this case, a heat exchange structure 5 is provided in the cooling air duct 12, which makes the operation more convenient.

[0038] In this embodiment, refer to Figure 4 The heat exchange structure 5 preferably includes a semiconductor cooling chip, which is installed on one side of the airflow direction within the cooling duct 12, with its heat dissipation fins extending to the middle of the cooling duct 12. The semiconductor cooling chip is easy to install and facilitates automated temperature control, thereby enabling precise temperature control of the corresponding cooling process. Of course, other heat dissipation structures can also be used, and this invention does not impose specific limitations on them. In one embodiment, the inlet of the cooling duct 12 can be directly connected to a low-temperature air source to directly obtain a low-temperature cooling airflow. This invention does not impose specific limitations on the method of obtaining the low-temperature cooling airflow, nor should it be considered a specific limitation on the scope of protection of this invention.

[0039] For the hot end of the nozzle, refer to Figures 2 to 7 To improve the ease of installation of the induction heating coil 3, this embodiment also includes a support member 6. The support member 6 is coaxially sleeved on the outer wall of the nozzle 2 from bottom to top, and when it is detachably connected to the lower side of the water-cooling block 1 from bottom to top, it drives the nozzle 2 to achieve detachable installation relative to the water-cooling block 1. In this embodiment, the nozzle 2 has an overall cylindrical structure; see reference. Figure 6 and Figure 7 The support member 6 is configured as a double-layer support sleeve 61, which specifically includes a first cylinder 611 and a second cylinder 612 coaxially sleeved from the inside out. The first cylinder 611 and the second cylinder 612 are fixedly connected at intervals by sealing plates 613 at their lower ends. The induction heating coil 3 is installed on the second cylinder 612, and the annular air supply channel 4 is naturally formed between the first cylinder 611 and the induction heating coil 3. Furthermore, to facilitate the assembly of the water-cooled block 1 and the support member 6, in this embodiment, the second cylinder 612 is formed with an outer edge 6121 along its own radial direction to achieve a detachable connection between the support member 6 and the water-cooled block 1 through the outer edge 6121.

[0040] In the embodiments of the present invention, reference is made to Figure 8 A number of mounting holes can be arranged in a circular array on the outer edge 6121, and then the outer edge and the water-cooling block 1 can be locked together by bolts or other fasteners to achieve detachable installation of the support member 6 on the lower side of the water-cooling block 1; of course, a mounting slot can also be opened at the position corresponding to the nozzle 2 at the lower end of the water-cooling block 1, and a slot can be opened on the outer wall of the opening of the mounting slot. The support member 6 and the water-cooling block 1 can be detachably connected by the snap-fit ​​cooperation between the outer edge 6121 and the slot; the present invention does not impose specific restrictions on the cooperation and installation form of the support member 6 relative to the water-cooling block 1.

[0041] Furthermore, to achieve a detachable connection between the support member 6 and the nozzle 2, refer to... Figure 6 and Figure 7In this embodiment, the nozzle 2 includes a small diameter section 21 and a large diameter section 22 sequentially from bottom to top along its own axial direction; correspondingly, the first cylinder 611 has an inner edge 6111 formed radially inward; during assembly, the first cylinder 611 slides from bottom to top onto the nozzle 2, and the inner edge 6111 slides relative to the outer wall of the nozzle 2 along its own axial direction until the upper end face of the inner edge 6111 abuts against the lower end face of the large diameter section 22; then, when the second cylinder 612 is stably connected to the water-cooled block 1 through the outer edge 6121, due to the pushing action of the inner edge 6111 on the large diameter section 22 from bottom to top, the first cylinder 611 simultaneously presses the nozzle 2 against the lower side of the water-cooled block 1 from bottom to top.

[0042] Preferably, in this embodiment, the nozzle 2 further includes a reduced diameter section 23, which is coaxially disposed between the small diameter section 21 and the large diameter section 22. When the outer edge 6121 abuts against the lower end face of the large diameter section 22 from bottom to top, the lower end of the outer edge 6121 corresponds to the section of the reduced diameter section 23. This prevents the outer edge 6121 of the double-layer support sleeve 61 from detaching directly from the nozzle 2 after detaching from the large diameter section 22 when installing or removing the double-layer support sleeve 61 and the nozzle 2, thereby improving production safety. In addition, an elastic support structure can also be provided in the reduced diameter section 23 of the nozzle 2. In actual assembly, after the double-layer support sleeve 61 is fitted onto the nozzle 2 and the inner edge 6111 abuts against the lower end of the large diameter section 22, the elastic support structure is fitted onto the reduced diameter section 23 of the nozzle 2 from bottom to top, and the outer circular surface of the elastic support structure is kept abutting against the wall surface of the first cylinder 611 near the nozzle 2, thereby improving the installation stability of the double-layer support sleeve 61 relative to the nozzle 2.

[0043] Furthermore, to ensure accurate and stable connection between the nozzle 2 and the wire feeding channel 11, in this embodiment, the upper end face of the large-diameter section 22 of the nozzle 2 is much higher than the upper end faces of the inner edge 6111 and the outer edge 6121. During assembly, the large-diameter section 22 of the nozzle 2 is inserted deep into the mounting slot in the water-cooling block 1, and then pressed against the bottom wall of the mounting slot from bottom to top. Similarly, it is preferable that the upper end face of the inner edge 6111 is higher than the upper end face of the outer edge 6121 to achieve a stable and sealed connection between the upper opening of the annular air supply channel 4 and the cooling channel.

[0044] Furthermore, refer to Figure 6 and Figure 7 In this embodiment, the support member 6 further includes a support ring 62, which is detachably installed on the inner wall of the second cylinder 612. The induction heating coil 3 is installed on the support ring 62 to achieve its modular arrangement relative to the double-layer support sleeve 61. Specifically, the support ring 62 is coaxially embedded in the second cylinder 612 and spaced apart from the first cylinder 611. The induction heating coil 3 is coaxially installed on the support ring 62. Furthermore, to ensure the stability and unobstructed flow of the annular air supply channel 4 and the ease of laying out the induction heating coil 3, in this embodiment, the induction heating coil 3 is coaxially sleeved on the outer wall of the support ring 62.

[0045] More specifically, in this embodiment, the support ring 62 includes a body 621 and an mounting section 622 arranged coaxially from bottom to top. The induction heating coil 3 is coaxially sleeved on the outer wall of the body 621. The annular air supply channel 4 is formed between the inner wall of the support ring 62 and the outer wall of the first cylinder 611. To prevent the induction heating coil 3 from falling off the support ring 62, a support ring 6211 extends radially outward from the lower end of the body 621, and the lower end of the induction heating coil 3 abuts against the upper end surface of the support ring 6211. When the mounting section 622 is embedded between the first cylinder 611 and the second cylinder 612, its outer wall surface slides and engages with the inner wall surface of the second cylinder 612, and its upper end is formed with a pressing edge 6221 along its own radial direction. After the mounting section 622 slides down relative to the inner wall of the second cylinder 612 along the axis of the second cylinder 612, it is placed on the inner wall surface of the second cylinder 612 through the pressing edge 6221, thereby realizing the detachable assembly of the support ring 62 and the induction heating coil 3 on it with the second cylinder 612.

[0046] To avoid damage to the second cylinder 612 by the induction heating coil 3 and to reduce the risk of overheating and short circuit of the induction heating coil 3, in this embodiment, the radial dimension of the main body 621 is larger than the radial dimension of the mounting section 622. After the induction heating coil 3 is assembled on the rear main body 621, the radial dimension of the main body 621 is also larger than the radial dimension of the induction heating coil 3, so as to ensure that the induction heating coil 3 is spaced apart from the inner wall of the second cylinder 612 and to form a heat dissipation space 7 between the induction heating coil 3 and the inner wall of the second cylinder 612.

[0047] Considering that when printing different model materials, some materials ejected from the nozzle require auxiliary cooling while others do not, in the embodiments of the present invention, different forms of support members 6 are provided in conjunction with the same water-cooling block 1; and the difference between the different forms of support members 6 lies only in the structural form of the double-layer support sleeve 61 and its cooperation with the support ring 62.

[0048] Below, we will elaborate on the structural forms of this 3D printing induction heating nozzle in 3D printing scenarios with different cooling requirements for printing materials. When printing materials that require auxiliary cooling, the support member 6 of Scheme 1 is used. In this case, the outlet of the annular air supply channel 4 needs to face the pre-set circular area below the nozzle 2; for details, refer to... Figure 6The outer edge of the sealing plate 613 on the support member 6 is sealed to the lower end of the second cylinder 612, while its inner edge near the first cylinder 611 is inclined downward toward the nozzle 2, forming a guide plate 8, so that an air outlet 81 is formed between the guide plate 8 and the lower end of the first cylinder 611. At this time, the lower end of the first cylinder 611 is fixedly connected to the guide plate 8 by several spaced connecting pieces, and the support ring 6211 on the support ring 62 abuts against the end of the sealing plate 613 near the guide plate 8, and the annular air supply channel 4 connects to the air outlet 81. In practical applications, the cooling airflow is guided to the air outlet 81 through the annular air supply channel 4, and after being guided by the guide plate 8, it is evenly blown toward the preset circular area below the nozzle 2, so as to uniformly dissipate heat from the printed model in this area.

[0049] When printing on materials that do not require auxiliary cooling, the support member 6 of scheme two is used. In this case, the outlet of the annular air supply channel 4 faces the induction heating coil 3; specifically, refer to... Figure 7 At this time, the upper sealing plate 613 of the support member 6 seals the lower end of the first cylinder 611 and the lower end of the second cylinder 612, and the lower end of the support ring 62 does not abut against the sealing plate 613. That is, the lower end of the support ring 62 and the sealing plate 613 are spaced apart, so that the annular air supply channel 4 connects to the heat dissipation space 7; in addition, refer to Figure 1 , Figures 6 to 10 An air outlet 9 is provided in the middle of the second cylinder 612 corresponding to the position of the heat dissipation space 7. In actual application, the cooling airflow in the annular air supply channel 4 enters the heat dissipation space 7 through the gap between the lower end of the support ring 62 and the sealing plate 613, cools the induction heating coil 3 in the heat dissipation space 7, and then flows out of the heat dissipation space 7 through the air outlet 9.

[0050] When performing 3D printing, depending on the required molding material, the support component 6 of Option 1 and Option 2 can be switched and assembled with the water-cooling block 1 to change the cooling object. Since the support component 6 and the water-cooling block 1 are easy to assemble, the corresponding switching operation is convenient and efficient, improving the user experience.

[0051] The implementation principle of this invention is as follows: In practical applications, when the molding material needs to be cooled, the support member 6 with the air guide plate 8 is assembled on the lower side of the water-cooled block 1, and the inlet of the cooling air duct 12 is connected to the air source; in specific operations, the air source is turned on, and the cooling airflow is introduced into the cooling air duct 12. The cooling airflow undergoes sufficient heat exchange through the cooling water circulation system in the water-cooled block 1, or at the same time undergoes sufficient cooling through the heat dissipation structure 5 such as the semiconductor cooling chip, and then flows into the annular air supply channel 4 to form a uniform annular airflow. After that, it is blown out from the air outlet 81 and blown towards the preset circular area below the nozzle 2 under the guiding action of the air guide plate 8, so as to efficiently cool the corresponding printed model; When the corresponding molding material does not require cooling, the support 6 with the air outlet 9 is assembled on the lower side of the water-cooled block 1, and the inlet of the cooling air duct 12 is connected to the air source. In specific operation, the air source is turned on, and the cooling airflow is introduced into the cooling air duct 12. The cooling airflow undergoes sufficient heat exchange through the cooling water circulation system in the water-cooled block 1, or at the same time undergoes sufficient cooling through the heat dissipation structure 5 such as the semiconductor cooling chip. Then, it flows into the annular air supply channel 4 and the heat dissipation space 7 in sequence, cooling the induction heating coil 3 in the heat dissipation space 7. After cooling, it flows out of the support 6 through the air outlet 9, thus achieving efficient cooling of the induction heating coil 3.

[0052] The 3D printing induction heating nozzle of this invention uses an induction heating coil 3 as the heating element and integrates the annular air supply channel 4 with the support member 6. This double-layer structure effectively reduces the space occupied by the hot end of the nozzle, ensuring the x and y direction travel of the nozzle. Simultaneously, by reusing the cold end of the nozzle, the cooling airflow temperature can be set to below room temperature, effectively improving the cooling efficiency of the printed model and the induction heating coil 3, achieving efficient cooling. When applied to high-performance material printing scenarios, this significantly improves the crystallinity control capability of the printed model. Furthermore, during the printing process, when the nozzle 2 needs cooling, reading the Gcode information assists in controlling the nozzle 2 temperature, significantly shortening the cooling time of the nozzle 2 and thus improving material leakage issues. This 3D printing induction heating nozzle has high overall integration, strong cooling capacity, convenient deployment, and excellent overall performance, effectively promoting cost reduction and efficiency improvement for enterprises.

[0053] When printing materials that require auxiliary cooling, the outlet of the annular air supply channel 4 faces the preset circular area below the nozzle 2 to efficiently cool the corresponding printed model; when printing materials that do not require auxiliary cooling, the outlet of the annular air supply channel 4 faces the induction heating coil 3 to efficiently cool the induction heating coil 3.

[0054] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A 3D printing induction heating nozzle, characterized in that, include: The water-cooled block has a vertical wire feeding channel inside; The nozzle is installed on the lower side of the water-cooled block and is connected to the wire feeding channel; An induction heating coil is coaxially sleeved around the nozzle, and naturally forms an annular air supply channel with the nozzle. The outlet of the annular air supply channel faces either a preset circular area below the nozzle or towards the induction heating coil. The water-cooled block is provided with a cooling air duct, the outlet of the cooling air duct is connected to the annular air supply channel, and the inlet of the cooling air duct is connected to a ventilation source.

2. The 3D printing induction heating nozzle according to claim 1, characterized in that, It also includes a support member, which is coaxially sleeved on the nozzle from bottom to top and detachably connected to the water-cooling block, and at the same time detachably installed the nozzle on the water-cooling block; The induction heating coil is mounted on the support member.

3. A 3D printing induction heating nozzle according to claim 2, characterized in that, The support member includes a double-layer support sleeve, which includes a first cylinder and a second cylinder that are coaxially arranged from the inside out and fixedly connected. The induction heating coil is coaxially arranged on the second cylinder so that the annular air supply channel is formed between the first cylinder and the second cylinder. The first cylinder has an inner edge formed inward along its own radial direction, and the second cylinder has an outer edge formed outward along its own radial direction; The nozzle, along its own axial direction from bottom to top, includes a small-diameter section and a large-diameter section. When the support member is fitted with the nozzle from bottom to top, the inner edge coaxially abuts against the lower end face of the large diameter section from bottom to top, so that when the outer edge is detachably installed on the lower side of the water-cooling block, the inlet of the nozzle connects to the wire feeding channel from bottom to top, and the inlet of the annular air supply channel connects to the cooling air duct.

4. A 3D printing induction heating nozzle according to claim 3, characterized in that, The support member also includes a support ring, which is coaxially and detachably disposed on the inner wall surface of the second cylinder, and is spaced apart from both the first cylinder and the second cylinder. The induction heating coil is coaxially sleeved on the outer wall surface of the support ring; The annular air supply channel is formed between the inner wall of the support ring and the outer wall of the first cylinder.

5. A 3D printing induction heating nozzle according to claim 4, characterized in that, The support ring includes a body and a mounting section coaxially connected from bottom to top, and the radial dimension of the body is larger than the radial dimension of the induction heating coil. The mounting section slides and engages with the inner wall of the second cylinder along the axis of the second cylinder; the induction heating coil is coaxially sleeved on the outer wall of the main body, and a heat dissipation space is formed between the induction heating coil and the inner wall of the second cylinder; The upper end of the mounting section is formed with a pressing edge along its own radial direction. The pressing edge is used to abut against the upper end face of the second cylinder when the mounting section is coaxially slid and embedded in the second cylinder from top to bottom.

6. A 3D printing induction heating nozzle according to claim 4 or 5, characterized in that, The lower end of the support ring extends outward along its own radial direction with a support ring; The lower end of the induction heating coil abuts against the upper end face of the support ring.

7. A 3D printing induction heating nozzle according to claim 5, characterized in that, The lower end of the second cylinder is provided with a sealing plate, and the lower end of the first cylinder and the lower end of the second cylinder are sealed and fixedly connected by the sealing plate; The lower end of the support ring is spaced apart from the sealing plate so that the annular air supply channel connects to the heat dissipation space; An air outlet is provided in the middle of the second cylinder, corresponding to the position of the heat dissipation space.

8. A 3D printing induction heating nozzle according to claim 5, characterized in that, The lower end of the second cylinder is provided with a sealing plate; the sealing plate is inclined toward the nozzle near the side edge of the first cylinder and forms an air guide plate; The lower end of the first cylinder is connected to the air guide plate by a plurality of spaced connecting pieces, so that an air outlet is formed between the air guide plate and the lower end of the first cylinder. The lower end of the support ring abuts against the end of the sealing plate near the air guide plate, so that the annular air supply channel is connected to the air outlet.

9. A 3D printing induction heating nozzle according to claim 1, characterized in that, The water-cooling block is provided with a water-cooling channel surrounding the wire feeding channel; The water-cooling channel is arranged in parallel with the cooling air duct.

10. A 3D printing induction heating nozzle according to claim 1 or 9, characterized in that, The cooling duct is equipped with a heat exchange structure, which is used to cool the airflow from the air source to the annular air supply channel.

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