Printhead and 3D printing device

Abstract

The application discloses a printing head and a 3D printing device, and relates to the technical field of 3D printing. The printing head comprises a cooling assembly, a hot end assembly and a quick-release assembly. The cooling assembly comprises a heat dissipation piece and a feeding pipe penetrating through the heat dissipation piece along a first direction. The hot end assembly comprises a heating piece and a nozzle. The nozzle has a consumable channel penetrating through along the first direction. The consumable channel is connected with the feeding pipe. The heating piece is arranged on the nozzle. The quick-release assembly is located between the heat dissipation piece and the nozzle. The quick-release assembly is detachably connected with the heat dissipation piece and the nozzle. The application aims to improve the dismounting efficiency of the printing head, improve the maintenance convenience and improve the processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and in particular to a print head and a 3D printing device. Background Technology

[0002] 3D printers are a type of rapid prototyping equipment that typically uses filaments. The filaments are molten through temperature control, extruded through the print head, and laid out according to a set path under program control to achieve rapid three-dimensional prototyping.

[0003] Before the filament is heated and enters a molten state, it needs to be kept cool to avoid clogging of the feed tube, thus ensuring continuous feeding of the print head. Therefore, a heat dissipation device is installed outside the feed tube. If the feed tube and the print head on the hot end need to be replaced due to factors such as print head wear or feed tube blockage, the heat dissipation device often needs to be disassembled during the replacement process. However, the existing heat dissipation device is connected to the feed tube by an interference fit, which not only makes disassembly difficult but also easily damages the feed tube, resulting in low replacement efficiency and processing efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a printhead and a 3D printing device that improves the efficiency of printhead assembly and disassembly, enhances maintenance convenience, and increases processing efficiency.

[0005] To achieve the above objectives, the present invention provides a printhead comprising:

[0006] A cooling assembly, the cooling assembly including a heat sink and a feed pipe extending along a first direction of the heat sink;

[0007] A hot-end assembly, comprising a heating element and a nozzle, the nozzle having a consumable channel extending along the first direction, the consumable channel being connected to the feed pipe, and the heating element being disposed on the nozzle; and

[0008] A quick-release assembly is located between the heat sink and the nozzle, and the quick-release assembly is detachably connected to the heat sink and the nozzle.

[0009] In one embodiment, the quick-release assembly includes a base and a connecting seat;

[0010] The base is detachably connected to the nozzle, and the connecting seat is detachably connected to the base and the heat sink.

[0011] In one embodiment, the base includes a connecting ring and a locking knob, the connecting ring being sleeved on the nozzle, and the connecting seat being detachably connected to the connecting ring;

[0012] The locking knob is screwed to the connecting ring, and the locking knob screws through the connecting ring to press against the nozzle.

[0013] In one embodiment, the connecting ring has an abutting surface on the side facing the locking knob, and the locking knob is screwed to the connecting ring and abuts against the abutting surface;

[0014] And / or, the connecting ring is provided with a mounting hole along the first direction, the nozzle passes through the mounting hole, and the wall of the mounting hole is threadedly connected to the nozzle.

[0015] In one embodiment, the connecting ring is provided with at least two mounting bosses, and each mounting boss is symmetrically arranged around the axis of the feed pipe;

[0016] The quick-release assembly includes at least two of the connecting seats, each of which is detachably connected to a mounting boss.

[0017] In one embodiment, the nozzle is provided with a limiting groove, and the bottom wall of the limiting groove facing the locking knob is flat;

[0018] One end of the locking knob passes through the connecting ring and abuts against the bottom wall of the limiting groove.

[0019] In one embodiment, the sidewall of the limiting groove is inclined so that the cross-sectional area of ​​the limiting groove gradually decreases from the vicinity of the locking knob to the distance from the locking knob.

[0020] In one embodiment, the quick-release assembly further includes a positioning element movably disposed on the base;

[0021] The nozzle is provided with a positioning groove, and the positioning groove and the limiting groove are arranged opposite to each other along the turning direction of the locking knob, and the positioning element is limited in the positioning groove.

[0022] In one embodiment, the positioning member has a stepped portion, the thin section of the stepped portion is confined in the limiting groove, and the thick section of the stepped portion is threadedly connected to the base;

[0023] And / or, the surface of the base that abuts against the positioning member is a plane.

[0024] In one embodiment, the quick-release assembly further includes a lock nut, which is screwed onto the locking knob and abuts against the connecting ring;

[0025] The direction of turning the anti-loosening nut is the same as the direction of turning the locking knob.

[0026] In one embodiment, the connecting seat includes a support platform and an extension arm, the support platform being detachably connected to the base;

[0027] The extension arm is connected to the support platform and extends away from the support platform to be detachably connected to the heat sink.

[0028] In one embodiment, the quick-release assembly further includes a first bolt and a second bolt, and the support platform is connected to the base via the first bolt;

[0029] The extension arm is connected to the heat sink via the second bolt.

[0030] In one embodiment, the quick-release assembly further includes a spacer pad, which is sleeved on the first bolt and located between the connector and the base;

[0031] And / or, the quick-release assembly further includes a spacer pad, which is fitted over the first bolt and located between the first bolt and the base;

[0032] And / or, the quick-release assembly further includes an isolation pad that is fitted over the second bolt and located between the second bolt and the heat sink.

[0033] In one embodiment, the connector is made of polyetheretherketone with 15% to 30% glass fiber added.

[0034] And / or, the print head further includes a throat tube, the throat tube being sleeved on the outer wall of the feed tube, and the heat dissipation component being sleeved on the outer wall of the throat tube;

[0035] And / or, the material of the feed pipe is stainless steel or alloy steel.

[0036] In one embodiment, the heat sink includes a heat sink body and a plurality of heat sinks, wherein the plurality of heat sinks are arranged in parallel and spaced apart from each other on the heat sink body;

[0037] The heat sink is provided with a heat insulation groove, which penetrates the heat sink body and the heat sink fin.

[0038] In one embodiment, the feed pipe includes a main body section and a connecting section, the main body section being connected to the heat sink;

[0039] One end of the connecting section is connected to the main body section, and the other end of the connecting section is connected to the nozzle. The wall thickness of the connecting section is less than the wall thickness of the main body section.

[0040] The present invention also proposes a 3D printing device, which includes a print head as described above.

[0041] The printhead of this invention includes a cooling component, a hot end component, and a quick-release component. The cooling component includes a feed pipe and a heat sink, with the heat sink disposed on the feed pipe. The hot end component includes a heating element and a nozzle, with the nozzle connected to the feed pipe and the heating element disposed on the nozzle. The quick-release component is located between the heat sink and the nozzle. By placing the quick-release component between the heat sink and the nozzle, and making the quick-release component detachably connected to both the heat sink and the nozzle, the disassembly and assembly efficiency between the heat sink and the nozzle is improved, thereby enhancing the ease of printhead maintenance and improving the overall processing efficiency of the printhead. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the printhead structure in one embodiment of the present invention;

[0044] Figure 2 This is a cross-sectional schematic diagram of the print head in one embodiment of the present invention;

[0045] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0046] Figure 4 This is a cross-sectional schematic diagram of the print head from another perspective in one embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the quick-release component in one embodiment of the present invention;

[0048] Figure 6 This is an exploded view of the quick-release component in one embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the structure of the feed pipe and the hot end assembly in one embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the feed pipe structure in one embodiment of the present invention;

[0051] Figure 9 This is a schematic diagram of the heat sink in one embodiment of the present invention.

[0052] Explanation of icon numbers:

[0053] 100. Printhead; 1. Cooling assembly; 11. Feed pipe; 111. Main body section; 1111. First mounting section; 1112. Second mounting section; 112. Connecting section; 12. Heat sink; 121. Heat sink body; 122. Heat sink fin; 123. Heat insulation groove; 2. Hot end assembly; 21. Heating element; 22. Nozzle; 221. Front nozzle; 222. Rear extrusion tube; 223. Heat-conducting seat; 2231. Limiting groove; 2232. Positioning groove 3. Quick-release assembly; 31. Base; 311. Connecting ring; 3111. Abutting surface; 3112. Mounting hole; 3113. Mounting boss; 312. Locking knob; 3121. Screw; 32. Connecting seat; 321. Support platform; 322. Extension arm; 323. Mounting groove; 33. First bolt; 34. Second bolt; 35. Isolation pad; 36. Positioning component; 361. Stepped part; 37. Anti-loosening nut; 4. Throat tube; 5. Protective cover.

[0054] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0057] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0058] Please refer to Figures 1 to 7 As shown, the present invention proposes a printhead 100, which includes a cooling assembly 1, a hot end assembly 2, and a quick-release assembly 3. The cooling assembly 1 includes a feed pipe 11 and a heat sink 12, with the heat sink 12 disposed on the feed pipe 11. The hot end assembly 2 includes a heating element 21 and a nozzle 22, with the nozzle 22 connected to the feed pipe 11 and the heating element 21 disposed on the nozzle 22. The quick-release assembly 3 is located between the heat sink 12 and the nozzle 22 and is configured to isolate the heat transferred from the nozzle 22 to the heat sink 12.

[0059] In this embodiment, the print head 100 is applied to a 3D printing device and is a key component of the 3D printing device. The print head 100 is located at the filament output end of the 3D printing device. The print head 100 has tiny channels inside. These tiny channels can guide the filament through and heat it, causing the solid filament to transform into a fluid filament, ensuring that the material can be uniformly extruded during the printing process and deposited along a preset path. On the other hand, the print head 100 can also control the extrusion speed and temperature of the filament by controlling the temperature of the channel heating, thereby achieving different printing effects.

[0060] In this embodiment, the cooling assembly 1 includes a feed pipe 11 and a heat sink 12. The feed pipe 11 is the main structure of the cooling assembly 1. The feed pipe 11 is a cylindrical tubular structure. The feed pipe 11 is used to receive the filament material transmitted from the feed tray and guide the filament feeding through the hollow internal cavity formed by the feed pipe 11.

[0061] Meanwhile, the printhead 100 also includes a hot end assembly 2, which includes a nozzle 22 and a heating element 21. The nozzle 22 is connected to the feed pipe 11 and communicates with the hollow chamber of the feed pipe 11 so that the filament inside the feed pipe 11 can enter the nozzle 22. The heating element 21 is located in the outer area of ​​the nozzle 22 and surrounds the nozzle 22. The heating element 21 can be a ceramic heating sleeve or a ring heating wire, etc., which is not limited here. The nozzle 22 is heated by the heating element 21 so that the nozzle 22 heats the filament inside, thereby turning the filament into a flowable molten fluid and flowing out from the nozzle 22.

[0062] Since the nozzle 22 is connected to the feed pipe 11, when the heating element 21 heats the nozzle 22, the heat from the nozzle 22 will inevitably be conducted to the feed pipe 11, causing the filament in the feed pipe 11 to deform due to heat. This results in a decrease in the efficiency of the filament moving in the feed pipe 11. When the temperature is higher, the filament will melt and block the feed pipe 11, making it impossible for the filament to be transferred from the feed pipe 11 to the nozzle 22.

[0063] Based on the above problems, the printhead 100 has a heat sink 12 at the feed pipe 11. The heat sink 12 can be a passive heat dissipation structure such as a heat sink tower or heat sink fins, or an active heat dissipation structure such as a heat dissipation fan or water cooling channel. The heat sink 12 is arranged around the feed pipe 11 to dissipate heat and cool the feed pipe 11, reduce the temperature rise of the nozzle 22 on the feed pipe 11, and ensure smooth transmission of the filament.

[0064] Furthermore, based on the provision of a heat sink 12 on the nozzle 22, since the feed tube 11 is relatively long and has a thin wall, the feed tube 11 is prone to breakage if the heat sink 12 is completely installed on it. Therefore, to ensure the installation strength of the heat sink 12, it is usually connected to the nozzle 22 to improve the installation strength of the heat sink 12 and ensure the overall structural stability of the printhead 100. However, this arrangement also makes it easy for the heat from the nozzle 22 to be transferred to the heat sink 12. Based on this, the printhead 100 is also provided with a quick-release assembly 3. The quick-release component 3 is located between the nozzle 22 and the heat sink 12. The quick-release component 3 can be located on the nozzle 22, on the heat sink 12, or connected to both the nozzle 22 and the heat sink 12. There is no limitation here. At the same time, the quick-release component 3 can be detachably connected to both the heat sink 12 and the nozzle 22 to enable quick and easy disassembly and assembly of the heat sink 12 and the nozzle 22, thereby improving the disassembly and assembly efficiency between the heat sink 12 and the nozzle 22, thus improving the maintenance convenience of the print head 100 and the overall processing efficiency of the print head 100.

[0065] In one embodiment, such as Figures 1 to 6 As shown, the quick-release assembly 3 includes a base 31 and a connecting seat 32; the base 31 is detachably connected to the nozzle 22, and the connecting seat 32 is detachably connected to the base 31 and the heat sink 12.

[0066] In this embodiment, the base 31 is detachably connected to the nozzle 22. The base 31 is a quick-release component, which can be connected to the nozzle 22 by means of a bolt structure or by means of a snap-fit ​​structure, so as to realize the quick-release component 3 and the nozzle 22 to be quickly and detachably connected. At the same time, the quick-release component 3 also includes a connecting seat 32. The connecting seat 32 is detachably connected to the base 31 on one hand, such as by means of a bolt connection or a snap-fit ​​connection, and on the other hand, it is detachably connected to the heat sink 12, such as by means of a bolt connection or a snap-fit ​​connection, so that the quick-release component 3 as a whole can be detachably connected to both the nozzle 22 and the heat sink 12.

[0067] Understandably, the base 31 can be made of heat-insulating material or conventional material. The base 31 is connected to the nozzle 22, and the connecting seat 32 is connected to the base 31 and the heat sink 12. The connecting seat 32 is located between the base 31 and the heat sink 12. The base 31 is mainly used to connect the nozzle 22 and the connecting seat 32, thereby realizing the mutual connection between the nozzle 22 and the heat sink 12, so as to realize the installation and fixation of the heat sink 12, thereby reducing the dependence of the heat sink 12 on the installation of the feed pipe 11, reducing the pressure on the feed pipe 11, and improving the overall installation strength. At the same time, the connecting seat 32 is used to isolate the heat conducted from the nozzle 22 to the heat sink 12. The connecting seat 32 can be a heat insulation board, heat insulation sheet, heat insulation pad, heat insulation blanket, heat insulation block, etc., with a layered quick-release component 3 or a porous quick-release component 3. It can also be a material that blocks the transfer of heat, such as foam material, fiber material, or material with a reflective coating on the surface.

[0068] Furthermore, the base 31 is detachably connected to the nozzle 22 on one hand and to the connecting seat 32 on the other. The base 31 also enables quick assembly and disassembly of the heat sink 12, the feed tube 11, and the nozzle 22, as well as quick assembly and disassembly of the connecting seat 32, the base 31, and the heat sink 12. This simplifies the installation process of the printhead 100, improves assembly and manufacturing efficiency, and facilitates the quick replacement of key components such as the heat sink 12, the feed tube 11, the nozzle 22, and the quick-release assembly 3, making daily maintenance easier.

[0069] In one embodiment, such as Figures 1 to 3 as well as Figure 5 , Figure 6 As shown, the base 31 includes a connecting ring 311 and a locking knob 312. The connecting ring 311 is sleeved on the nozzle 22, and the connecting seat 32 is detachably connected to the connecting ring 311. The locking knob 312 is screwed to the connecting ring 311 and can pass through the connecting ring 311 to press against the nozzle 22.

[0070] In this embodiment, the connecting ring 311 is an annular structure, which is sleeved on one end of the nozzle 22 near the heat sink 12 and on the heat conduction seat 223. The support platform 321 in the connecting seat 32 is detachably connected to the connecting ring 311 by the first bolt 33, and at least two connecting seats 32 are provided on the connecting ring 311 to surround the nozzle 22. A threaded adjustment hole is provided on the connecting ring 311, and a screw 3121 is provided on the locking knob 312. The screw 3121 is threaded in the threaded adjustment hole and threadedly connected to the inner wall of the threaded adjustment hole. The locking knob 312 passes through the connecting ring 311 and abuts against the heat conduction seat 223.

[0071] It is understandable that the outer wall of the rear extrusion tube 222 is usually provided with a heat-conducting seat 223, and the structural strength of the rear extrusion tube 222 is given priority. Therefore, the heat sink 12 is usually connected to the heat-conducting seat 223. In this application, the heat sink 12 is installed on the heat-conducting seat 223 through the base 31 and the connecting seat 32, thereby effectively fixing the heat sink 12, improving the structural strength and stability of the heat sink 12 and the print head 100 as a whole, especially the stability during the printing process. Furthermore, the quick-release assembly 3 and the nozzle 22 are detachably connected through the connecting ring 311 and the locking knob 312, allowing for quick separation of the nozzle 22 and the heat sink 12, thus improving the ease of disassembly and assembly.

[0072] In one embodiment, such as Figure 6 As shown, the connecting ring 311 has an abutment surface 3111 on the side facing the locking knob 312. The locking knob 312 is screwed to the connecting ring 311 and abuts against the abutment surface 3111. It can be understood that the abutment surface 3111 on the side of the connecting ring 311 facing the locking knob 312 allows the locking knob 312 to directly abut against the abutment surface 3111 when it is screwed to the connecting ring 311. This prevents the locking knob 312 from loosening during the long-term movement of the print head 100, effectively improving the abutment strength between the locking knob 312 and the connecting ring 311, and ensuring the abutment strength between the locking knob 312 and the nozzle 22.

[0073] Optionally, the connecting ring 311 is provided with a mounting hole 3112, which is fitted onto the nozzle 22, and the wall of the mounting hole 3112 is threadedly connected to the nozzle 22.

[0074] In one embodiment, such as Figure 5 and Figure 6 As shown, the connecting ring 311 is provided with at least two mounting bosses 3113, each mounting boss 3113 is symmetrically arranged around the axis of the feed pipe 11, and the mounting bosses 3113 extend away from the feed pipe 11; the quick-release assembly 3 includes at least two connecting seats 32, each connecting seat 32 is detachably connected to a mounting boss 3113.

[0075] It is understood that the connecting ring 311 has at least two mounting bosses 3113 around its body. Each mounting boss 3113 is symmetrically arranged around the axis of the feed pipe 11, that is, the center of the mounting hole 3112. At the same time, the mounting bosses 3113 extend away from the feed pipe 11 to provide installation space for the connecting seat 32, thereby facilitating the connection between the connecting seat 32 and the two connecting rings 311. Each connecting seat 32 is detachably connected to one mounting boss 3113, so that at least two connecting seats 32 can be arranged around the connecting ring 311 to ensure the connection strength between the connecting ring 311 and the heat sink 12, and between the connecting ring 311 and the nozzle 22.

[0076] In one embodiment, such as Figure 3 As shown, the nozzle 22 is provided with a limiting groove 2231, and the bottom wall of the limiting groove 2231 is a plane; one end of the locking knob 312 passes through the connecting ring 311 and abuts against the bottom wall of the limiting groove 2231.

[0077] It is understandable that the heat-conducting seat 223 has a limiting groove 2231 on the side facing the screw 3121 of the locking knob 312. The bottom wall of the limiting groove 2231 facing the locking knob is flat, and the end face of the screw 3121 of the locking knob 312 facing the limiting groove 2231 is also flat. The screw 3121 of the locking knob 312 can pass through the connecting ring 311 and abut against the flat bottom wall of the limiting groove 2231. Through the mutual abutment of the planes, on the one hand, the screw 3121 of the locking knob 312 is not easy to damage the heat-conducting seat 223, and on the other hand, the surface abutment area is large, and the abutment force between the locking knob 312 and the heat-conducting seat 223 is strong. Therefore, the connecting ring 311 can be effectively locked on the heat-conducting seat 223, preventing the base 31 from rotating during the printing process, and also improving the connection strength between the heat sink 12 and the heat-conducting seat 223.

[0078] In one embodiment, the sidewall of the limiting groove 2231 is inclined so that the cross-sectional area of ​​the limiting groove 2231 gradually decreases from the vicinity of the locking knob 312 to the distance from the locking knob 312.

[0079] Understandably, at least two sidewalls of the limiting groove 2231 are inclined along the extension direction of the rear extrusion tube 222, and expand outward from the bottom wall of the limiting groove 2231, so that the cross-sectional area of ​​the limiting groove 2231 gradually decreases from the vicinity of the locking knob 312 to the distance from the locking knob 312. With this configuration, when the screw 3121 of the locking knob 312 extends into the limiting groove 2231, the inclined sidewalls of the limiting groove 2231 can guide the screw 3121 of the locking knob 312 to abut against the limiting groove 2231. The bottom wall of 31 enables the locking knob 312 to be aligned with the heat-conducting seat 223. At the same time, when the front nozzle 221 extrudes molten material, the front nozzle 221 will be pressurized and transmit the pressure to the rear extrusion tube 222 and the heat-conducting seat 223. At this time, the inclined side wall of the limiting groove 2231 can limit the connecting ring 311 and the locking knob 312 in the extension direction of the tube body of the rear extrusion tube 222, preventing them from being displaced in this direction, so as to maintain the connection strength and stability between the heat sink 12 and the heat-conducting seat 223.

[0080] In one embodiment, such as Figure 2 , Figure 3 as well as Figure 5 , Figure 6As shown, the quick-release assembly 3 also includes a positioning element 36, which is movably mounted on the base 31; the nozzle 22 is provided with a positioning groove 2232, which is positioned opposite to the limiting groove 2231 along the turning direction of the locking knob 312, and the positioning element 36 is limited in the positioning groove 2232.

[0081] It is understandable that the positioning component 36 is spirally connected to the connecting ring 311 on the base 31. A positioning groove 2232 is provided on the heat-conducting seat 223 opposite to the limiting groove 2231. One end of the positioning component 36 passes through the connecting ring 311 and extends into the positioning groove 2232, positioning and abutting against the positioning groove 2232. By setting the positioning groove 2232 and the positioning component 36, the accurate position of the locking knob 312 relative to the connecting ring 311 is ensured, avoiding the locking knob 312 being installed backwards during the assembly process, thereby reducing the probability that the connecting ring 311 and the heat-conducting seat 223 may separate during the processing and printing process due to backward installation.

[0082] In one embodiment, such as Figure 6 As shown, the positioning member 36 is provided with a stepped portion 361, the thin section of the stepped portion 361 is limited in the limiting groove 2231, and the thick section of the stepped portion 361 is threadedly connected to the base 31; optionally, the surface of the base 31 that abuts against the positioning member 36 is a plane.

[0083] It is understood that the positioning member 36 is a positioning bolt. The positioning member 36 is provided with a stepped portion 361 at the end. The stepped portion 361 includes a thin section and a thick section. Along the extension direction of the column of the positioning bolt, the cross-sectional area of ​​the thin section is smaller than that of the thick section, so as to form a stepped structure between the thin section and the thick section. When the thick section is threadedly connected to the connecting ring 311 of the base 31, the thin section extends into the mounting hole 3112 of the connecting ring 311 and is confined in the limiting groove 2231 of the nozzle 22, so as to improve the positioning and limiting ability of the positioning member 36 for the nozzle 22 and the connecting ring 311, and ensure the connection strength between the connecting ring 311 and the nozzle 22.

[0084] In one embodiment, such as Figure 1 , Figure 2 as well as Figure 5 , Figure 6 As shown, the quick-release assembly 3 also includes a lock nut 37, which is screwed onto the locking knob 312 and abuts against the connecting ring 311; the turning direction of the lock nut 37 is the same as the turning direction of the locking knob 312.

[0085] It is understood that the screw 3121 of the locking knob 312 includes a first thread and a second thread. The first thread is located at the end of the screw 3121 and is screwed to the thread adjustment hole. The second thread is located in the middle area of ​​the first thread away from the end of the screw 3121. The loosening nut is screwed to the second thread so that the anti-loosening nut 37 is located between the locking knob 312 and the connecting ring 311. By turning the knob to lock the anti-loosening nut 37 and pressing the anti-loosening nut 37 against the connecting ring 311, double anti-loosening can be achieved between the locking knob 312 and the connecting ring 311, avoiding the loosening of the locking knob 312 and the connecting ring 311 due to the frequent pressure and vibration of the nozzle 22, and ensuring the connection stability between the heat sink 12 and the heat conduction seat 223.

[0086] In one embodiment, such as Figure 1 , Figures 4 to 6 As shown, the connecting base 32 includes a support platform 321 and an extension arm 322. The support platform 321 is detachably connected to the base 31. The extension arm 322 is connected to the support platform 321 and extends away from the support platform 321 to be detachably connected to the heat sink 12.

[0087] In this embodiment, the support platform 321 is detachably connected to the base 31, such as by bolts or snap-fit ​​connections. The support platform 321 is a structural support component for the connecting seat 32, and can also be a base frame or mounting platform. The extension arm 322 is connected to the support platform 321 and extends from the support platform 321 in a direction away from the support platform 321. The end of the extension arm 322 away from the support platform 321 is detachably connected to the heat sink 12, such as by bolts or snap-fit ​​connections. The extension arm 322 and the support platform 321 enclose a mounting groove 323. Part of the heat sink 12 abuts against the extension arm 322 and the support platform 321 so that the heat sink 12 is limited and installed in the mounting groove 323.

[0088] Meanwhile, the quick-release assembly 3 may include two connecting seats 32, which are disposed opposite to each other on the base 31. The mounting slots 323 of the two connecting seats 32 are disposed opposite to each other and are connected to each other to form an installation space. The bottom of the heat sink 12 abuts against the two support platforms 321, and the two connecting seats 32 are disposed on both sides of the heat sink 12 so that the heat sink 12 is limited in the installation space.

[0089] Understandably, the mounting groove 323 formed by the support platform 321 and the extension arm 322 can limit and fix the heat sink 12, and facilitate the detachable connection of the connecting seat 32 to the heat sink 12, so as to realize the quick assembly and disassembly of the quick-release component 3 and the heat sink 12. Furthermore, while improving the installation firmness of the heat sink 12 through the support platform 321 and the extension arm 322, it can also reduce the heat conducted from the nozzle 22 to the heat sink 12 through the base 31.

[0090] In one embodiment, such as Figures 4 to 6 As shown, the quick-release assembly 3 also includes a first bolt 33 and a second bolt 34. The support platform 321 is connected to the base 31 by the first bolt 33; the extension arm 322 is connected to the heat sink 12 by the second bolt 34.

[0091] Understandably, both the support platform 321 and the base 31 are provided with threaded holes, allowing the support platform 321 to be detachably connected to the base 31 via the first bolt 33. Both the extension arm 322 and the heat sink 12 are provided with threaded holes, allowing the extension arm 322 to be detachably connected to the heat sink 12 via the second bolt 34. Since the heat sink 12 is relatively heavy, it is prone to shaking due to insecure installation during the printing process of the print head 100, which may lead to a decrease in the printing accuracy of the nozzle 22. Therefore, based on the support platform 321 and the extension arm 322, the first bolt 33 and the second bolt 34 are provided to ensure the connection strength between the support platform 321 and the base 31, as well as between the extension arm 322 and the heat sink 12. This ensures the connection strength between the heat sink 12 and the nozzle 22 located below, thus ensuring the overall installation stability of the heat sink 12. It also facilitates the disassembly and assembly of the connecting seat 32 and the base 31, as well as the disassembly and assembly of the connecting seat 32 and the heat sink 12.

[0092] Furthermore, the first bolt 33 and the second bolt 34 can also be configured as quick-release components 3 with porous or composite structures, or as heat-insulating materials such as stainless steel, polymer, or fiber materials, thereby reducing heat conduction between the base 31 and the connecting seat 32, and between the connecting seat 32 and the heat sink 12.

[0093] In one embodiment, the first bolt 33 and the second bolt 34 are made of stainless steel. It is understood that the first bolt 33 and the second bolt 34 are made of stainless steel. Compared with traditional carbon steel bolts, stainless steel bolts have a lower thermal conductivity and better heat insulation performance. They can effectively isolate the heat conduction from the base 31 to the connecting seat 32 and from the connecting seat 32 to the heat sink 12, thereby reducing the heat conduction between the nozzle 22 and the heat sink 12. In addition, stainless steel has high strength, which can ensure the connection strength between the base 31 and the connecting seat 32 and the heat sink 12, and ensure the connection stability of the heat sink 12.

[0094] Optionally, such as Figure 4 and Figure 6As shown, the first bolt 33 is screwed in the same direction as the extension direction of the feed pipe 11, and the second bolt 34 is screwed in a direction perpendicular to the first bolt 33. It can be understood that the first bolt 33 is used to connect the base 31 and the connecting seat 32. Preferably, the screwing direction of the first bolt 33 is set to be the same as the extension direction of the feed pipe 11, so that the support platform 321 can have a threaded hole along the extension direction of the feed pipe 11 and be connected to the base 31 via the first bolt 33. Simultaneously, the first bolt 33 is used to connect the heat sink 12 and the connecting seat 32. Preferably, the screwing direction of the second bolt 34 is set to be perpendicular to the screwing direction of the first bolt 33, so that the extension arm 322 and the heat sink 12 can be installed via the second bolt 34 at the side wall of the heat sink 12, perpendicular to the extension direction of the feed pipe 11. This reduces the impact of other components on the disassembly and assembly of the heat sink 12, making the disassembly and assembly between the quick-release assembly 3 and the heat sink 12 more convenient and faster.

[0095] In one embodiment, such as Figure 4 and Figure 6 As shown, the quick-release assembly 3 also includes an isolation pad 35, which is sleeved on the first bolt 33 and located between the connecting seat 32 and the base 31; optionally, the quick-release assembly 3 also includes an isolation pad 35, which is sleeved on the first bolt 33 and located between the first bolt 33 and the base 31; optionally, the quick-release assembly 3 also includes an isolation pad 35, which is sleeved on the second bolt 34 and located between the second bolt 34 and the heat sink 12.

[0096] In this embodiment, the isolation pad 35 can be disposed between the connecting seat 32 and the base 31, and / or between the first bolt 33 and the base 31, and / or between the second bolt 34 and the heat sink 12. The isolation pad 35 can isolate heat transfer between the connecting seat 32 and the base 31, and / or between the first bolt 33 and the base 31, and / or between the second bolt 34 and the heat sink 12, so as to reduce the heat conducted from the nozzle 22 to the heat sink 12. For example, the isolation pad 35 can be a heat insulation board, heat insulation sheet, heat insulation pad, heat insulation blanket, or heat insulation material. The heat insulation structure, such as the block, has a layered or porous structure. It can also block the transfer of heat through its special materials, such as foam materials, fiber materials, or materials with reflective coatings on the surface. In addition, the isolation pad 35 can also be a multi-layered or porous buffer structure. At the same time, the isolation pad 35 is set on the first bolt 33 and / or the second bolt 34, which can also prevent the first bolt 33 and / or the second bolt 34 from loosening. The isolation pad 35 also has a certain buffering effect to reduce the impact on the connecting seat 32 when the nozzle 22 abuts the printing plane.

[0097] Specifically, there may be an installation gap in the area where the support platform 321 of the base 31 and the connecting seat 32 are connected, which may allow heat to be transferred from the base 31 to the heat sink 12. Therefore, an isolation pad 35 can be provided between the connecting seat 32 and the base 31. The isolation pad 35 may only cover the area where the support platform 321 and the base 31 abut, or it may cover the entire area of ​​the base 31 facing the heat sink 12. There is no limitation here.

[0098] In another embodiment, the base 31 is provided with a threaded hole, and the first bolt 33 is limited in the threaded hole. Since the first bolt 33 is made of metal, it will inevitably transfer the heat from the nozzle 22 to the connecting seat 32 and the heat sink 12. Therefore, an isolation pad 35 can be provided between the first bolt 33 and the base 31 to isolate the heat transfer.

[0099] In another embodiment, a second bolt 34 is provided between the connecting seat 32 and the heat sink 12. The second bolt 34 is also made of metal and will generate a certain amount of heat conduction. Therefore, a heat insulation component can be provided between the second bolt 34 and the heat sink 12 to isolate heat transfer, reduce the heat conducted from the nozzle 22 to the heat sink 12, and improve the heat dissipation capacity of the heat sink 12 to the feed pipe 11.

[0100] Meanwhile, when the heat sink 12 is connected to the feed tube 11, the heat sink 12 and the nozzle 22 can be directly connected through the isolation pad 35, thereby reducing the mechanical load on the feed tube 11 from the heat sink 12, reducing the force on the feed tube 11, thereby improving the service life of the feed tube 11 and the mechanical installation strength of the overall print head 100.

[0101] In one embodiment, the connector 32 is made of polyetheretherketone (PEEK) with 15% to 30% glass fiber added. It is understood that PEEK has excellent high-temperature resistance, especially maintaining stable performance under high temperature and high humidity conditions. Adding glass fiber increases the heat distortion temperature to 280–300°C, effectively isolating heat transfer. Simultaneously, the addition of 15% to 30% glass fiber enhances the overall compressive, bending, and tensile strength and dimensional stability of the connector 32, improving the overall structural strength of the quick-release assembly 3 and the printhead 100. Optionally, the feed tube 11 can be made of alloy materials such as titanium alloy, aluminum alloy, aluminum-magnesium alloy, or copper alloy. It is understood that titanium alloy has high strength and rigidity, capable of withstanding high pressure. Titanium alloy also has good high-temperature resistance and good heat diffusion capacity, enabling stable material delivery and resistance to high temperatures. It also quickly transfers heat from the nozzle 22 to the heat sink 12, improving the cooling effect of the heat sink 12 on the feed tube 11 and reducing the temperature rise of the feed tube 11. Optionally, such as Figure 2 , Figure 4 as well as Figure 7As shown, the printhead 100 also includes a throat 4, which is sleeved on the outer wall of the feed tube 11, and a heat sink 12 is sleeved on the outer wall of the throat 4. It can be understood that the throat 4 is set on the outer wall of the feed tube 11, and a part of the structure of the heat sink 12 is sleeved on the outer wall of the throat 4. The throat 4 is spaced apart from the nozzle 22. By setting the throat 4, the area of ​​the feed tube 11 adjacent to the nozzle 22 can be thermally isolated, reducing the temperature rise in the area of ​​the feed tube 11 adjacent to the nozzle 22. At the same time, setting the throat 4 can also improve the heat transfer between the feed tube 11 and the heat sink 12 in this area, improve the heat dissipation performance of the heat sink 12 in this area, and further reduce the temperature rise in this area.

[0102] In one embodiment, such as Figure 2 , Figure 4 as well as Figure 7 As shown, the nozzle 22 includes a front nozzle 221, a rear extrusion tube 222, and a heat-conducting seat 223. The front nozzle 221 is connected to the rear extrusion tube 222. The heat-conducting seat 223 is connected to the rear extrusion tube 222 and is arranged around the rear extrusion tube 222. The heating element 21 is sleeved on the heat-conducting seat 223. The base 31 is detachably connected to the heat-conducting seat 223.

[0103] In this embodiment, the structure of the heat-conducting seat 223 can be a tubular structure, a grooved structure with three sidewalls, or a sheet-like structure (for example, the rear extrusion tube 222 is a square tube structure, and one sidewall of the rear extrusion tube 222 is in single-sided contact with the sheet-like heat-conducting seat 223 for heating), etc., and is not limited here; the front nozzle 221 and the rear extrusion tube 222 are connected and communicate with each other. The rear extrusion tube 222 and the feed tube 11 extend in the same direction and are connected and communicate with each other. The front nozzle 221 is connected to the end of the rear extrusion tube 222 away from the end connected to the feed tube 11. The length of the rear extrusion tube 222 along the tube body extension direction is greater than the length of the front nozzle 221. At the same time, the nozzle 22 also includes a heat-conducting seat 223, which is threadedly connected to the rear extrusion tube 222. A heating element 21, such as a ceramic heating sleeve or annular heating wire, is sleeved on the outer periphery of the heat-conducting seat 223 on the side away from the front nozzle 221. The heating element 21 heats the heat-conducting seat 223, thereby heating the rear extrusion tube 222, so as to heat the filament material in the rear extrusion tube 222 to form a molten state, which can flow out from the front nozzle 221.

[0104] Understandably, the rear extrusion tube 222 is located behind the nozzle 22 and is usually connected to the material supply system, i.e., the feed tube 11, so that the filament in the feed tube 11 enters the rear extrusion tube 222. The filament is heated and melted by the heating element 21 at the rear extrusion tube 222. The front nozzle 221 is responsible for extruding the molten material to form a printing layer. At the same time, the front nozzle 221 can also adjust the thickness and pressure of the printed lines to adapt to different printing scenarios and different printing needs.

[0105] In one embodiment, such as Figure 1 , Figure 2 , Figure 4 as well as Figure 9 As shown, the heat sink 12 includes a heat sink body 121 and a plurality of heat sinks 122, which are arranged in parallel and spaced apart on the heat sink body 121; the heat sink 12 is provided with a heat insulation groove 123, which penetrates the heat sink body 121 and the heat sinks 122.

[0106] It is understandable that the heat insulation groove 123 penetrates the heat dissipation body 121 and the heat sink 122, and the heat insulation groove 123 is located on part of the heat dissipation body 121 and the heat sink 122. When the heat from the connecting seat 32 is transferred to the heat dissipation body 121 and the heat sink 122, due to the addition of the heat insulation groove 123, the heat transfer medium at that point is air. The heat transfer efficiency of air is low, which reduces the heat transfer efficiency. This reduces the heat transfer from the nozzle 22 to the heat sink 12 through the connecting seat 32, reduces the heat absorption at the throat 4 and the feed pipe 11, increases the cooling speed of the filament, and facilitates smooth filament feeding.

[0107] In one embodiment, such as Figures 1 to 4 as well as Figure 7 , Figure 8 As shown, the feed pipe 11 includes a main body section 111 and a connecting section 112. The main body section 111 is connected to the heat sink 12. One end of the connecting section 112 is connected to the main body section 111, and the other end of the connecting section 112 is connected to the nozzle 22. The wall thickness of the connecting section 112 is less than the wall thickness of the main body section 111.

[0108] In this embodiment, the feed pipe 11 is made of titanium alloy. The feed pipe 11 is arranged in sequence as a main body section 111 and a connecting section 112 along the extension direction of the pipe body. The connecting section 112 and the main body section 111 are connected to each other and communicate with each other. The main body section 111 is connected to the heat sink 12. One end of the connecting section 112 is connected to the main body section 111 and communicates with the main body section 111. The other end of the connecting section 112 is interference-fitted to the rear extrusion tube 222 in the nozzle 22 and communicates with the rear extrusion tube 222.

[0109] The wall thickness of the connecting section 112 is less than that of the main section 111. The wall thickness of the connecting section 112 is set between 0.3mm and 0.5mm (inclusive), preferably 0.4mm. The wall thickness of the main section 111 is greater than that of the connecting section 112. Since the wall thickness of the connecting section 112 is thinner, the volume of titanium alloy at the connecting section 112 is smaller than that at the main section 111. Less material can more effectively block heat transfer, further isolating the heat conduction between the main section 111 (connected to the feed pipe 11 and the heat sink 12) and the nozzle 22. This reduces the heat conducted from the rear extrusion pipe 222 to the main section 111 and the heat sink 12 through the connecting section 112, ensuring the heat dissipation effect of the heat sink 12 on the main section 111 of the feed pipe 11, thereby ensuring the normal transmission of the filament.

[0110] In another embodiment of the present invention, the main body segment 111 includes a first mounting segment 1111 and a second mounting segment 1112. The second mounting segment 1112 is located between the first mounting segment 1111 and the connecting segment 112. The second mounting segment 1112 is connected to the first mounting segment 1111 and the connecting segment 112 at both ends of the pipe body, and the second mounting segment 1112, the first mounting segment 1111, and the connecting segment 112 are interconnected. The wall thickness of the second mounting segment 1112 is less than the wall thickness of the first mounting segment 1111 and greater than the wall thickness of the connecting segment 112. The pipe body forms a shape from the first mounting segment 1111 to the second mounting segment 1112 and then to the connecting segment 112. The stepped structure with gradually decreasing wall thickness can further reduce heat conduction from the nozzle 22 to the heat sink 12 surrounding the feed pipe 11. On the other hand, it also facilitates the installation of the throat 4 at the step between the second mounting section 1112 and the first mounting section 1111, improving the installation strength and stability between the main body section 111 of the feed pipe 11 and the throat 4, as well as between the throat 4 and the heat sink 12. At the same time, the mutual contact between the inner and outer walls of the throat 4 and the second mounting section 1112 and the heat sink 12 can also effectively increase the heat dissipation effect of the heat sink 12 on the main body section 111 of the feed pipe 11, thereby effectively reducing the overall temperature rise of the feed pipe 11 at the main body section 111.

[0111] The present invention also proposes a 3D printing device, which includes a print head 100 as described above. The print head 100 has a protective cover 5 around the heating element 21 to protect the internal nozzle 22 and the heating element 21, and also to prevent operators from being burned by the heating element 21. The specific structure of the print head 100 is as described in the foregoing embodiments. Since this 3D printing device adopts all the technical solutions of all the foregoing embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be elaborated further here.

[0112] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A printhead, characterized in that, The printhead includes: A cooling assembly, the cooling assembly including a heat sink and a feed pipe extending along a first direction of the heat sink; A hot-end assembly, comprising a heating element and a nozzle, the nozzle having a consumable channel extending along the first direction, the consumable channel being connected to the feed pipe, and the heating element being disposed on the nozzle; and A quick-release assembly is located between the heat sink and the nozzle, and is detachably connected to the heat sink and the nozzle. The quick-release assembly includes a base and a connecting seat. The base is detachably connected to the nozzle, and the connecting seat is detachably connected to the base and the heat sink. The nozzle includes a front nozzle, a rear extrusion tube, and a heat-conducting seat. The front nozzle is connected to the rear extrusion tube. The heat-conducting seat is connected to the rear extrusion tube and surrounds the rear extrusion tube. The heating element is sleeved on the heat-conducting seat, and the base is detachably connected to the heat-conducting seat.

2. The printhead as described in claim 1, characterized in that, The base includes a connecting ring and a locking knob. The connecting ring is sleeved on the nozzle, and the connecting seat is detachably connected to the connecting ring. The locking knob is screwed to the connecting ring, and the locking knob screws through the connecting ring to press against the nozzle.

3. The printhead as described in claim 2, characterized in that, The connecting ring has an abutting surface on the side facing the locking knob, and the locking knob is spirally connected to the connecting ring and abuts against the abutting surface; And / or, the connecting ring is provided with a mounting hole along the first direction, the nozzle passes through the mounting hole, and the wall of the mounting hole is threadedly connected to the nozzle.

4. The printhead as described in claim 2, characterized in that, The connecting ring is provided with at least two mounting bosses, and each mounting boss is symmetrically arranged around the axis of the feed pipe; The quick-release assembly includes at least two of the connecting seats, each of which is detachably connected to a mounting boss.

5. The printhead as described in claim 2, characterized in that, The nozzle is provided with a limiting groove, and the bottom wall of the limiting groove facing the locking knob is flat; One end of the locking knob passes through the connecting ring and abuts against the bottom wall of the limiting groove.

6. The printhead as described in claim 5, characterized in that, The sidewall of the limiting groove is inclined so that the cross-sectional area of ​​the limiting groove gradually decreases from the vicinity of the locking knob to the distance from the locking knob.

7. The printhead as described in claim 5, characterized in that, The quick-release assembly also includes a positioning element, which is movably disposed on the base. The nozzle is provided with a positioning groove, and the positioning groove and the limiting groove are arranged opposite to each other along the turning direction of the locking knob, and the positioning element is limited in the positioning groove.

8. The printhead as described in claim 7, characterized in that, The positioning member has a stepped portion, the thin section of the stepped portion is confined in the limiting groove, and the thick section of the stepped portion is threadedly connected to the base; And / or, the surface of the base that abuts against the positioning member is a plane.

9. The printhead as described in claim 2, characterized in that, The quick-release assembly also includes a lock nut, which is screwed onto the locking knob and abuts against the connecting ring; The direction of turning the anti-loosening nut is the same as the direction of turning the locking knob.

10. The printhead as claimed in any one of claims 1 to 9, characterized in that, The connecting seat includes a support platform and an extension arm, wherein the support platform is detachably connected to the base; The extension arm is connected to the support platform and extends away from the support platform to be detachably connected to the heat sink.

11. The printhead as claimed in claim 10, characterized in that, The quick-release assembly also includes a first bolt and a second bolt, and the support platform is connected to the base via the first bolt; The extension arm is connected to the heat sink via the second bolt.

12. The printhead as claimed in claim 11, characterized in that, The quick-release assembly also includes an isolation pad, which is sleeved on the first bolt and located between the connecting seat and the base; And / or, the quick-release assembly further includes a spacer pad, which is fitted over the first bolt and located between the first bolt and the base; And / or, the quick-release assembly further includes an isolation pad that is fitted over the second bolt and located between the second bolt and the heat sink.

13. The printhead as claimed in any one of claims 1 to 9, characterized in that, The connector is made of polyetheretherketone with 15% to 30% glass fiber added. And / or, the print head further includes a throat tube, the throat tube being sleeved on the outer wall of the feed tube, and the heat dissipation component being sleeved on the outer wall of the throat tube; And / or, the material of the feed pipe is stainless steel or alloy steel.

14. The printhead as claimed in any one of claims 1 to 9, characterized in that, The heat dissipation component includes a heat dissipation body and a plurality of heat dissipation fins, wherein the plurality of heat dissipation fins are arranged in parallel and spaced apart on the heat dissipation body; The heat sink is provided with a heat insulation groove, which penetrates the heat sink body and the heat sink fin.

15. The printhead as claimed in any one of claims 1 to 9, characterized in that, The feed pipe includes a main body section and a connecting section, wherein the main body section is connected to the heat dissipation component; One end of the connecting section is connected to the main body section, and the other end of the connecting section is connected to the nozzle. The wall thickness of the connecting section is less than the wall thickness of the main body section.

16. A 3D printing device, characterized in that, The 3D printing equipment includes a print head as described in any one of claims 1 to 15.

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