A 3D printing nozzle

Abstract

This utility model relates to a 3D printing nozzle, including a heat dissipation pipe. A pneumatic head is located at the upper end of the heat dissipation pipe, and a nozzle is located at the lower end. A throat connecting the pneumatic head and the nozzle is located inside the heat dissipation pipe. Several heat dissipation fins are arranged on the outer side of the heat dissipation pipe, with gaps between them. A frame is arranged outside the heat dissipation fins, supporting an induction coil and a temperature sensor. The induction coil surrounds the heating area of ​​the nozzle. The nozzle is made of a magnetically conductive metal, and the temperature sensor's measuring end abuts against the outer wall of the nozzle. This utility model achieves rapid electromagnetic induction heating of the nozzle by directly surrounding the induction coil below the nozzle and using a closed-loop control system with a temperature sensor. Heat is instantly conducted from the inside out, reducing the heating time from the traditional 1-3 minutes to 10-15 seconds. Simultaneously, the heat dissipation pipe and fins continuously cool the throat area, preventing thermal degradation, ensuring uniform filament output, and significantly improving printing efficiency and material utilization.

Description

Technical Field

[0001] This utility model relates to the field of 3D printer technology, and in particular to a 3D printing nozzle. Background Technology

[0002] Current fused deposition modeling (FDM) 3D printers generally use resistance heating rods or ceramic heating blocks to preheat the nozzle. Heat is conducted from the outside in, and the heating rate is limited by the material's thermal conductivity and thermal inertia, typically requiring 1-3 minutes to reach the target temperature. With increasing printing speeds and the need for multiple material switching, this waiting time has become a bottleneck restricting production capacity and printing accuracy: slow heating during cold starts and material changes leads to high equipment idle rates; prolonged high-temperature standby can easily cause material thermal degradation and nozzle clogging. Utility Model Content

[0003] In order to overcome the shortcomings of the above-mentioned background technology, the present invention provides a 3D printing nozzle for rapid heating of the nozzle to improve printing efficiency.

[0004] The technical implementation scheme of this utility model is as follows: a 3D printing nozzle includes a heat dissipation pipe, a pneumatic head is provided at the upper end of the heat dissipation pipe, and a discharge nozzle is provided at the lower end. A throat connecting the pneumatic head and the discharge nozzle is provided inside the heat dissipation pipe. Several heat dissipation fins are provided on the outside of the heat dissipation pipe, with gaps between the heat dissipation fins. A frame is provided on the outside of the heat dissipation fins. An induction coil and a temperature sensor are supported by the frame. The induction coil is arranged around the heating area of ​​the discharge nozzle. The discharge nozzle is made of magnetic metal. The temperature measuring end of the temperature sensor abuts against the outer wall of the discharge nozzle.

[0005] More preferably, the frame includes a hollow frame body and a frame front end. The frame body surrounds the outside of the heat sink and is fixedly connected to the heat sink. The frame front end is installed at the lower end of the frame body by a quick-release buckle and surrounds the outside of the induction coil.

[0006] More preferably, a wiring groove is formed on the outer side of the heat dissipation pipe for routing the wires of the induction coil and temperature sensor.

[0007] More preferably, a heat sink is provided on the outer side of the frame body, and a controller is provided on the 3D printing nozzle. The controller is connected to a temperature sensor, a heat sink, and an induction coil, and is used to control the rotation speed of the heat sink and the power output of the induction coil according to the signal from the temperature sensor.

[0008] More preferably, the discharge nozzle is made of 420 stainless steel, 440C stainless steel, or H13 tool steel.

[0009] More preferably, the outer wall of the discharge nozzle has a concave shape adapted to the temperature measuring end of the temperature sensor.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] 1. This utility model uses an induction coil directly around the bottom of the nozzle, combined with a temperature sensor for closed-loop control, to achieve rapid electromagnetic induction heating of the nozzle; heat is conducted instantaneously from the inside out, reducing the heating time from the traditional 1-3 minutes to 10-15 seconds. At the same time, the heat dissipation pipe and heat sink continuously cool the throat section, preventing thermal degradation, ensuring uniform filament output, and significantly improving printing efficiency and material utilization.

[0012] 2. This utility model, through its hollow frame body and quick-release buckles, enables the rapid assembly and disassembly of the entire nozzle, making maintenance convenient.

[0013] 3. This utility model uses a wiring groove on the outer wall of the heat dissipation pipe to centrally hide the induction coil and sensor cable, reducing the risk of tangling and making the wiring neat and safe.

[0014] 4. This utility model uses an external heat sink and a closed-loop controller for real-time PID power adjustment, resulting in stable heating and rapid cooling, thus avoiding overheating and material blockage.

[0015] 5. This utility model uses a high-hardness, magnetically conductive discharge nozzle that is resistant to high temperatures and anti-adhesion, increasing the lifespan of the nozzle by more than double when printing high-melting-point materials.

[0016] 6. This utility model improves the accuracy of temperature measurement by having the outer wall of the discharge nozzle concave and closely fitting with the temperature sensor probe. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a partially enlarged view of the present invention.

[0019] Figure 3 This is a cross-sectional view of the heat dissipation pipe of this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the frame body of this utility model with a heat sink installed.

[0021] The meanings of the labels in the attached diagram are as follows: 1. Heat pipe, 11. Wiring trough, 12. Heat sink, 2. Pneumatic head, 3. Discharge nozzle, 31. Concave, 4. Throat, 5. Frame, 51. Frame body, 52. Front end of frame, 6. Induction coil, 7. Temperature sensor, 8. Heat sink. Detailed Implementation

[0022] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0023] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-4 As shown, the 3D printing nozzle in this embodiment uses a heat dissipation pipe 1 as its main body. The upper end of the heat dissipation pipe 1 is connected to a pneumatic head 2 via a thread, and a discharge nozzle 3 is connected via a high-temperature threaded seal. A throat 4 coaxially passes through the heat dissipation pipe 1, connecting the pneumatic head 2 and the discharge nozzle 3 to form a filament passage. Several heat dissipation fins 12 are integrally cut into the outer circumference of the heat dissipation pipe 1, with a gap of 2mm between the fins to ensure heat dissipation efficiency. A hollow frame 5 is assembled on the outside of the heat dissipation fins 12. The frame 5 is made of high-temperature resistant nylon composite material, which has both insulation and structural strength. Multiple wiring grooves 11 are milled on the outer wall of the heat dissipation pipe 1. The wires of the induction coil 6 and the temperature sensor 7 are led along the grooves to avoid tangling.

[0026] The frame 5 consists of a hollow frame body 51 and a frame front end 52. The frame body 51 surrounds the heat sink 12 and is secured with screws. The frame front end 52 is snapped into the lower end of the body via quick-release clips, completely protecting the induction coil 6. Disassembly can be completed quickly by simply pressing the clips. A miniature blower radiator 8 is installed on the outside of the frame body 51. Its PWM controller receives the signal from the temperature sensor 7 in real time and uses PID to adjust the fan speed and the power of the induction coil 6, so that the nozzle temperature fluctuation is ≤±1℃.

[0027] The discharge nozzle 3 is made of 420 stainless steel (440C or H13 tool steel can also be used). Its outer wall has a recess 31. The probe end of the temperature sensor 7 is embedded in this recess, fitting tightly against the metal wall. The temperature sensor 7 is a type K thermocouple, with its sensing end embedded in the recess 31 of the outer wall of the discharge nozzle 3 to a depth of approximately 1.5mm. High-temperature thermal grease can be applied to ensure efficient heat transfer. The temperature sensor 7 is supported at the front end 52 of the frame by a mounting bracket.

[0028] The induction coil 6 is made of copper wire and is wrapped non-contactly around the heating zone of the discharge nozzle 3. The inner diameter of the coil is slightly larger than the outer diameter of the discharge nozzle 3, and the distance between the two is approximately 0.5 mm. The two ends of the induction coil 6 are connected to the controller via the wiring groove 11. The induction coil 6 is also supported on the front end 52 of the frame.

[0029] During operation, the controller drives the induction coil 6 at a high frequency of 20kHz, and the nozzle 3 rises from room temperature to the set temperature within 10-15 seconds. Excess heat is quickly dissipated by the heat sink 12 and the radiator 8 to prevent thermal degradation of the material. The entire printhead is small in size, heats up quickly, and has precise temperature control, which can significantly improve printing efficiency and material utilization.

[0030] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications, improvements, and substitutions without departing from the inventive concept, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A 3D printing nozzle, characterized in that, The device includes a heat sink (1), with a pneumatic head (2) at the upper end and a discharge nozzle (3) at the lower end. A throat (4) connecting the pneumatic head (2) and the discharge nozzle (3) is provided inside the heat sink (1). Several heat sinks (12) are provided on the outside of the heat sink (1), with gaps between the heat sinks (12). A frame (5) is provided on the outside of the heat sinks (12), and an induction coil (6) and a temperature sensor (7) are supported on the frame (5). The induction coil (6) is arranged around the heating area of ​​the discharge nozzle (3). The discharge nozzle (3) is made of magnetic metal. The temperature measuring end of the temperature sensor (7) abuts against the outer wall of the discharge nozzle (3).

2. The 3D printing nozzle of claim 1, wherein, The frame (5) includes a hollow frame body (51) and a frame front end (52). The frame body (51) surrounds the outside of the heat sink (12) and is fixedly connected to the heat sink (12). The frame front end (52) is installed at the lower end of the frame body (51) by a quick-release buckle and surrounds the outside of the induction coil (6).

3. The 3D printing nozzle of claim 2, wherein, A wiring groove (11) is formed on the outside of the heat dissipation pipe (1) for wiring of the induction coil (6) and temperature sensor (7).

4. The 3D printing nozzle of claim 3, wherein, A heat sink (8) is provided on the outside of the frame body (51), and a controller is provided on the 3D printing nozzle. The controller is connected to a temperature sensor (7), a heat sink (8) and an induction coil (6) and is used to control the rotation speed of the heat sink (8) and the power output of the induction coil (6) according to the signal of the temperature sensor (7).

5. The 3D printing nozzle of claim 4, wherein, The discharge nozzle (3) is made of 420 stainless steel, 440C stainless steel, or H13 tool steel.

6. The 3D printing nozzle of claim 5, wherein, The outer wall of the discharge nozzle (3) has a recess (31) adapted to the temperature measuring end of the temperature sensor (7).

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