Printing head and 3D printing equipment

Abstract

The invention discloses a printing head and 3D printing equipment, 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 in the first direction of the heat dissipation piece, the hot end assembly comprises a heating piece and a nozzle, and the nozzle is provided with a consumable channel penetrating in the first direction; the consumable channel is connected with the feeding pipe, the heating piece is arranged on the nozzle, and the quick-release assembly is located between the heat dissipation piece and the nozzle and detachably connected to the heat dissipation piece and the nozzle. The disassembly and assembly efficiency of the printing head is improved, the maintenance convenience is improved, and the machining efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a print head and a 3D printing device. Background Art

[0002] A 3D printer is a rapid prototyping process equipment that generally uses filamentary materials, which are molten through temperature control, extruded through a print head, and laid out along a set path under program control to achieve three-dimensional rapid prototyping.

[0003] Before the wire is heated and enters a molten state, it needs to be kept cool to avoid clogging of the feed tube, thereby ensuring continuous feeding of the print head. Therefore, a heat sink is installed on the outside of the feed tube. If the print head is worn or the feed tube is clogged, the feed tube and the print head on the hot end need to be replaced. During the replacement process, the heat sink often needs to be disassembled. However, the existing heat sink is connected to the feed tube with an interference fit, which is not only difficult to disassemble, but also easy to damage the feed tube, resulting in low replacement efficiency and processing efficiency. Summary of the invention

[0004] The main purpose of the present invention is to provide a print head and a 3D printing device, aiming to improve the efficiency of disassembly and assembly of the print head, improve the convenience of maintenance, and improve the processing efficiency.

[0005] To achieve the above object, the present invention provides a print head, the print head comprising: A cooling assembly, the cooling assembly comprising a heat sink and a feed pipe extending in a first direction along the heat sink; a hot end assembly, the hot end assembly comprising a heating element and a nozzle, the nozzle having a consumables channel penetrating along the first direction, the consumables 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 the quick-release assembly is detachably connected to the heat sink and the nozzle.

[0006] In one embodiment, 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.

[0007] In one embodiment, 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 screw passes through the connecting ring to tighten the nozzle.

[0008] In one embodiment, a contact plane is provided on one side of the connecting ring facing the locking knob, and the locking knob is spirally connected to the connecting ring and contacts the contact plane. And / or, the connecting ring is provided with a mounting hole along the first direction, the nozzle passes through the mounting hole, and the hole wall of the mounting hole is threadedly connected to the nozzle.

[0009] In one embodiment, the connecting ring is provided with at least two mounting bosses, and each of the mounting bosses is symmetrically arranged around the axis direction of the feed pipe; The quick-release assembly includes at least two connecting seats, and each connecting seat is detachably connected to one of the mounting bosses.

[0010] In one embodiment, the nozzle is provided with a limiting groove, and the bottom wall of the limiting groove facing the locking knob is a plane; One end of the locking knob passes through the connecting ring and presses against the bottom wall of the limiting groove.

[0011] In one embodiment, the side wall of the limiting groove is inclined so that the cross-sectional area of ​​the limiting groove gradually decreases from adjacent to the locking knob to away from the locking knob.

[0012] In one embodiment, the quick-release assembly further comprises a positioning member, and the positioning member is movably disposed on the base; The nozzle is provided with a positioning groove, and the positioning groove and the limiting groove are arranged to be opposite to each other along the screwing direction of the locking knob, and the positioning member is limited in the positioning groove.

[0013] In one embodiment, the positioning member is provided with a step portion, a thin section of the step portion is limited in the limiting groove, and a thick section of the step portion is threadedly connected to the base; And / or, the surface where the base abuts against the positioning member is a plane.

[0014] In one embodiment, the quick-release assembly further comprises a locking nut, wherein the locking nut is screwed to the locking knob and pressed against the connecting ring; The screwing direction of the anti-loosening nut is the same as the screwing direction of the locking knob.

[0015] In one embodiment, the connection base includes a support platform and an extension arm, and the support platform is detachably connected to the base; The extension arm is connected to the support platform and extends in a direction away from the support platform so as to be detachably connected to the heat sink.

[0016] 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; The extension arm is connected to the heat sink through the second bolt.

[0017] In one embodiment, the quick-release assembly further 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 an isolation pad, which is sleeved on the first bolt and located between the first bolt and the base; And / or, the quick-release assembly further includes an isolation pad, which is sleeved on the second bolt and located between the second bolt and the heat sink.

[0018] In one embodiment, the material of the connection seat is polyetheretherketone added with 15% to 30% glass fiber; And / or, the print head further comprises a throat, the throat is sleeved on the outer wall of the feed pipe, and the heat sink is sleeved on the outer wall of the throat; And / or, the feed pipe is made of stainless steel or alloy steel.

[0019] In one embodiment, the heat sink comprises a heat sink body and a plurality of heat sinks, wherein the plurality of heat sinks are arranged in parallel and at intervals on the heat sink body; The heat dissipation element is provided with a heat insulation groove, and the heat insulation groove runs through the heat dissipation body and the heat dissipation fin.

[0020] In one embodiment, the feed pipe includes a main body section and a connecting section, and the main body section is connected to the heat sink; One end of the connecting section is connected to the main section, and the other end of the connecting section is connected to the nozzle. The thickness of the tube wall of the connecting section is smaller than the thickness of the tube wall of the main section.

[0021] The present invention also provides a 3D printing device, which includes the print head as described above.

[0022] The print head of the technical solution of the present 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, the heat sink is arranged on the feed pipe, the hot end component includes a heating element and a nozzle, the nozzle is connected to the feed pipe, the heating element is arranged on the nozzle, and the quick-release component is located between the heat sink and the nozzle. By arranging the quick-release component between the heat sink and the nozzle and making the quick-release component detachably connected to the heat sink and the nozzle at the same time, the disassembly and assembly efficiency between the heat sink and the nozzle is improved, thereby improving the maintenance convenience of the print head and improving the overall processing efficiency of the print head. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a print head in one embodiment of the present invention; Figure 2 is a schematic cross-sectional view of a print head in one embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged view of the middle A; Figure 4 is a cross-sectional schematic diagram of a print head from another viewing angle in one embodiment of the present invention; Figure 5 It is a structural schematic diagram of a quick-release assembly in one embodiment of the present invention; Figure 6 It is an exploded schematic diagram of a quick-release assembly in one embodiment of the present invention; Figure 7 It is a schematic diagram of the structure of a feed pipe and a hot end assembly in one embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a feed pipe in one embodiment of the present invention; Fig. 9 FIG. 4 is a schematic structural diagram of a heat sink in an embodiment of the present invention.

[0025] Description of Figure Numbers: 100, print head; 1, cooling assembly; 11, feed pipe; 111, main section; 1111, first mounting section; 1112, second mounting section; 112, connecting section; 12, heat sink; 121, heat sink body; 122, heat sink; 123, heat insulation groove; 2, hot end assembly; 21, heating element; 22, nozzle; 221, front nozzle; 222, rear extrusion tube; 223, thermal seat; 2231, limit groove; 2232, positioning groove ; 3. Quick-release assembly; 31. Base; 311. Connecting ring; 3111. Abutment plane; 3112. Mounting hole; 3113. Mounting boss; 312. Locking knob; 3121. Screw; 32. Connecting seat; 321. Support platform; 322. Extension arm; 323. Mounting slot; 33. First bolt; 34. Second bolt; 35. Isolation pad; 36. Positioning piece; 361. Step portion; 37. Anti-loosening nut; 4. Throat; 5. Protective cover.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Please refer to Figures 1 to 7 As shown, the present invention proposes a print head 100, which includes a cooling component 1, a hot end component 2 and a quick-release component 3. The cooling component 1 includes a feed pipe 11 and a heat sink 12, and the heat sink 12 is arranged on the feed pipe 11. The hot end component 2 includes a heating component 21 and a nozzle 22, and the nozzle 22 is connected to the feed pipe 11. The heating component 21 is arranged on the nozzle 22. The quick-release component 3 is located between the heat sink 12 and the nozzle 22, and the quick-release component 3 is configured to isolate the heat transferred from the nozzle 22 to the heat sink 12.

[0031] In this embodiment, the print head 100 is applied to a 3D printing device, and the print head 100 is a key component of the 3D printing device. The print head 100 is arranged at the filament output end of the 3D printing device, and a fine channel is formed inside the print head 100. The fine channel formed by the print head 100 can, on the one hand, guide the filament to pass through and heat the filament to convert the solid filament into a fluid filament by heat, so as to ensure that the material can be extruded evenly during the printing process and can be deposited according to a preset path; on the other hand, the print head 100 can also control the temperature of heating the channel to control the extrusion speed and extrusion temperature of the filament to achieve different printing effects.

[0032] 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 wire material transmitted from the material tray and guide the wire feeding through the hollow internal chamber formed by the feed pipe 11.

[0033] At the same time, the print head 100 also includes a hot end component 2, which includes a nozzle 22 and a heating element 21. The nozzle 22 is connected to the feed pipe 11, and the nozzle 22 is communicated with the hollow chamber of the feed pipe 11 so that the wire material inside the feed pipe 11 can enter the nozzle 22. The heating element 21 is arranged in the outer area of ​​the nozzle 22 and is arranged around the nozzle 22. The heating element 21 can be a ceramic heating sleeve or a ring heating wire or other structure, which is not limited here. The nozzle 22 is heated by the heating element 21 so that the nozzle 22 heats the internal wire material, thereby converting the wire material into a flowable molten fluid and flowing out from the nozzle 22.

[0034] Among them, since the nozzle 22 is connected to the feed tube 11, when the heating element 21 heats the nozzle 22, the heat of the nozzle 22 will inevitably be transferred to the feed tube 11, so that the wire material at the feed tube 11 will also be deformed by the heat, thereby causing the efficiency of the wire material moving in the feed tube 11 to decrease. When the temperature is higher, the melted wire material will block the feed tube 11, making it impossible for the wire material to be transferred from the feed tube 11 to the nozzle 22.

[0035] Based on the above problems, the print head 100 is provided with 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 or heat sink fins, or an active heat dissipation structure such as a heat sink fan or a water-cooled heat dissipation 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 feed pipe 11 caused by the nozzle 22, and ensure the smooth transmission of the filament.

[0036] Furthermore, based on the heat sink 12 being arranged on the nozzle 22, since the feed tube 11 is long and thin, the heat sink 12 is completely installed at the feed tube 11, and the feed tube 11 is easy to break. Therefore, in order to ensure the installation strength of the heat sink 12, the heat sink 12 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 print head 100. However, such an arrangement makes it easy for the heat of the nozzle 22 to be transferred to the heat sink 12. Based on this, the print head 100 is also provided with a quick-release assembly 3, and the quick-release assembly Part 3 is arranged between the nozzle 22 and the heat sink 12. The quick-release component 3 can be arranged on the nozzle 22 or on the heat sink 12, or the quick-release component 3 is connected to both the nozzle 22 and the heat sink 12. No limitation is made here. At the same time, the quick-release component 3 is detachably connected to the heat sink 12 and the nozzle 22 at the same time, so as to achieve rapid detachable assembly and disassembly of the heat sink 12 and the nozzle 22, so as to improve the disassembly and assembly efficiency between the heat sink 12 and the nozzle 22, thereby improving the maintenance convenience of the print head 100 and improving the overall processing efficiency of the print head 100.

[0037] In one embodiment, if 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 .

[0038] In this embodiment, the base 31 is detachably connected to the nozzle 22. The base 31 is a quick-release component, such as being connected to the nozzle 22 through a bolt structure, or being connected to the nozzle 22 through a snap-fit ​​structure, so as to achieve a quick and detachable connection between the quick-release assembly 3 and the nozzle 22. At the same time, the quick-release assembly 3 also includes a connecting seat 32. The connecting seat 32 is detachably connected to the base 31 on the one hand, such as through a bolt connection or a snap-fit ​​connection, and is detachably connected to the heat sink 12 on the other hand, such as through a bolt connection or a snap-fit ​​connection, so that the quick-release assembly 3 as a whole can be detachably connected to both the nozzle 22 and the heat sink 12.

[0039] It can be understood that the base 31 can be a heat-insulating material or a conventional material. The base 31 is connected to the nozzle 22, the connecting seat 32 is connected to the base 31 and the heat sink 12, and the connecting seat 32 is located between the base 31 and the heat sink 12, wherein 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 installation dependence of the heat sink 12 on 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, and the connecting seat 32 can be a special quick-release component 3 with a layered quick-release component 3 or a porous quick-release component 3, such as a heat-insulating board, a heat-insulating sheet, a heat-insulating pad, a heat-insulating blanket, a heat-insulating block, etc., or it can be a special material that blocks heat transfer, such as foam material, fiber material, or a material with a reflective coating on the surface.

[0040] Furthermore, the base 31 is detachably connected to the nozzle 22 on the one hand, and is detachably connected to the connecting seat 32 on the other hand. The base 31 can also realize quick disassembly and assembly of the heat sink 12, the feed pipe 11 and the nozzle 22, and quick disassembly and assembly of the connecting seat 32, the base 31 and the heat sink 12, thereby simplifying the installation process of the print head 100, improving assembly and manufacturing efficiency, and facilitating quick replacement of key components such as the heat sink 12, the feed pipe 11, the nozzle 22 and the quick-release assembly 3, thereby facilitating daily maintenance.

[0041] In one embodiment, if 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 spirally connected to the connecting ring 311, and the locking knob 312 can penetrate the connecting ring 311 and press against the nozzle 22.

[0042] In this embodiment, the connecting ring 311 is an annular structure, which is sleeved on one end of the nozzle 22 adjacent to the heat sink 12 and on the heat conductive seat 223. The support platform 321 in the connecting seat 32 is detachably connected to the connecting ring 311 by a first bolt 33, and at least two connecting seats 32 are arranged on the connecting ring 311 to surround the nozzle 22. A threaded adjustment hole is provided on the connecting ring 311, and the locking knob 312 is provided with a screw 3121. The screw 3121 is threadedly provided in the threaded adjustment hole and is 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 conductive seat 223.

[0043] It can be understood that the outer wall of the rear end extrusion tube 222 is usually provided with a thermal conductive seat 223, and the structural strength of the rear end extrusion tube 222 is prioritized, so the heat sink 12 is usually connected to the thermal conductive seat 223. In the present application, the heat sink 12 is installed on the thermal conductive seat 223 through the base 31 and the connecting seat 32, so that the heat sink 12 can be effectively fixed, and the structural strength and stability of the heat sink 12 and the print head 100 as a whole are improved, especially the stability during the printing process, and the quick release assembly 3 and the nozzle 22 are detachably connected through the connecting ring 311 and the locking knob 312, and the nozzle 22 and the heat sink 12 are quickly separated in the direction, thereby improving the convenience of disassembly and assembly.

[0044] In one embodiment, if Figure 6 As shown, the connecting ring 311 is provided with an abutting plane 3111 on the side facing the locking knob 312, and the locking knob 312 is spirally connected to the connecting ring 311 and abuts against the abutting plane 3111; it can be understood that the connecting ring 311 is provided with an abutting plane 3111 on the side facing the locking knob 312, so that when the locking knob 312 is spirally connected to the connecting ring 311, it can directly abut against the abutting plane 3111, thereby preventing the locking knob 312 from loosening during the long-term movement of the print head 100, effectively improving the abutting strength between the locking knob 312 and the connecting ring 311, and ensuring the abutting strength of the locking knob 312 against the nozzle 22.

[0045] Optionally, the connecting ring 311 is provided with a mounting hole 3112 , the mounting hole 3112 is sleeved on the nozzle 22 , and the hole wall of the mounting hole 3112 is threadedly connected to the nozzle 22 .

[0046] In one embodiment, if 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 axial direction of the feed pipe 11, and the mounting boss 3113 extends in a direction away from the feed pipe 11; the quick-release assembly 3 includes at least two connecting seats 32, and each connecting seat 32 is detachably connected to a mounting boss 3113.

[0047] It can be understood that the connecting ring 311 is provided with at least two mounting bosses 3113 around the ring body, and 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 boss 3113 extends in a direction away from the feed pipe 11 to provide an installation space for the connecting seat 32, thereby facilitating the connection between the connecting seat 32 and the two connecting rings 311, and making each connecting seat 32 detachable and connected to a 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.

[0048] In one embodiment, if 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 presses against the bottom wall of the limiting groove 2231 .

[0049] When the heat sink 312 is in the state of being moved forward, the end face of the screw 3121 of the locking knob 312 is also formed on the upper surface of the heat sink 312, and the upper surface of the heat sink 312 is in the state of being moved forward, so that the heat sink 312 is in the state of being moved forward, and the heat sink 312 is in the state of being moved forward.

[0050] In one embodiment, the side wall of the limiting groove 2231 is inclined so that the cross-sectional area of ​​the limiting groove 2231 gradually decreases from being adjacent to the locking knob 312 to being away from the locking knob 312 .

[0051] It can be understood that at least two side walls of the limiting groove 2231 along the extension direction of the tube body of the rear end extrusion tube 222 are inclined, and expand outward from the bottom wall of the limiting groove 2231, so that the groove cross-sectional area of ​​the limiting groove 2231 is gradually reduced from the vicinity of the locking knob 312 to the distance from the locking knob 312. In this way, when the screw rod 3121 of the locking knob 312 extends into the limiting groove 2231, the inclined side wall of the limiting groove 2231 can guide the screw rod 3121 of the locking knob 312 to abut against the limiting groove 22 The bottom wall of 31 realizes the centering of the locking knob 312 and the thermal seat 223. At the same time, when the front nozzle 221 extrude the molten material, the front nozzle 221 will be pressurized and the pressure will be transmitted to the rear extrusion tube 222 and the thermal 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 to avoid displacement in this direction, so as to maintain the connection strength and stability between the heat sink 12 and the thermal seat 223.

[0052] In one embodiment, if Figure 2 , Figure 3 as well as Figure 5 , Figure 6As shown, the quick-release assembly 3 also includes a positioning member 36, which is movably arranged on the base 31; the nozzle 22 is provided with a positioning groove 2232, and the positioning groove 2232 and the limiting groove 2231 are arranged to be opposite to each other along the screwing direction of the locking knob 312, and the positioning member 36 is limited in the positioning groove 2232.

[0053] It can be understood that the positioning member 36 is spirally connected to the connecting ring 311 on the base 31, and a positioning groove 2232 is arranged on the thermal seat 223 opposite to the limit groove 2231. One end of the positioning member 36 passes through the connecting ring 311 and extends into the positioning groove 2232, and is positioned and abutted with the positioning groove 2232. By setting the positioning groove 2232 and the positioning member 36, the accurate position of the locking knob 312 relative to the connecting ring 311 is ensured, and the locking knob 312 is prevented from being installed upside down during the assembly process, thereby reducing the probability of separation between the connecting ring 311 and the thermal seat 223 during the processing and printing process due to the upside down installation.

[0054] In one embodiment, if Figure 6 As shown, the positioning member 36 is provided with a step portion 361, the thin section of the step portion 361 is limited in the limiting groove 2231, and the thick section of the step portion 361 is threadedly connected to the base 31; optionally, the surface where the base 31 and the positioning member 36 abut is a plane.

[0055] It can be understood that the positioning member 36 is a positioning bolt, and a step portion 361 is provided at the end of the positioning member 36. The step 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 the cross-sectional area of ​​the thick section, so as to form a step 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 limited in the limiting groove 2231 of the nozzle 22, so as to enhance the positioning and limiting capabilities of the positioning member 36 on the nozzle 22 and the connecting ring 311, and ensure the connection strength between the connecting ring 311 and the nozzle 22.

[0056] In one embodiment, if Figure 1 , Figure 2 as well as Figure 5 , Figure 6 As shown, the quick-release assembly 3 further includes a locking nut 37 , which is screwed to the locking knob 312 and pressed against the connecting ring 311 ; the screwing direction of the locking nut 37 is the same as that of the locking knob 312 .

[0057] It can be 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 spirally connected to the threaded adjustment hole, and the second thread is located in the middle area of ​​the first thread away from the end of the screw 3121, and the loosening nut is spirally connected 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 anti-loosening nut 37 and making the anti-loosening nut 37 press against the connecting ring 311, the locking knob 312 and the connecting ring 311 can be doubly prevented from loosening, thereby avoiding loosening of the locking knob 312 and the connecting ring 311 due to frequent pressure and vibration of the nozzle 22, thereby ensuring the stability of the connection between the heat sink 12 and the thermal conductive seat 223.

[0058] In one embodiment, if Figure 1 , Figures 4 to 6 As shown, the connection 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 .

[0059] In this embodiment, the support platform 321 is detachably connected to the base 31, such as by bolt connection or snap connection, and the support platform 321 is a structural support component of the connecting seat 32, and can also be a structure such as a base frame or a mounting platform, and the extension arm 322 is connected to the support platform 321, and the extension arm 322 extends from the support platform 321 in a direction away from the support platform 321, and the extension arm 322 is detachably connected to the heat sink 12 away from the end connected to the support platform 321, such as by bolt connection or snap connection, wherein the extension arm 322 and the support platform 321 enclose a mounting groove 323, and part of the heat sink 12 abuts against the extension arm 322 and the support platform 321, so that the heat sink 12 is limitedly installed in the mounting groove 323.

[0060] At the same time, the quick-release assembly 3 may include two connecting seats 32, the two connecting seats 32 are relatively arranged on the base 31, and the installation grooves 323 of the two connecting seats 32 are relatively arranged and interconnected 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 arranged on both sides of the heat sink 12 so that the heat sink 12 is limited in the installation space.

[0061] It can be understood that the installation 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 disassembly and assembly of the quick-release assembly 3 and the heat sink 12. In addition, while improving the installation firmness of the heat sink 12 by 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.

[0062] In one embodiment, if Figures 4 to 6 As shown, the quick-release assembly 3 further includes a first bolt 33 and a second bolt 34 , the support platform 321 is connected to the base 31 via the first bolt 33 ; the extension arm 322 is connected to the heat sink 12 via the second bolt 34 .

[0063] The support platform 321 and the base 31 are both provided with threaded holes, so that the support platform 321 can be detachably connected to the base 31 by the first bolt 33, and the extension arm 322 and the heat sink 12 are both provided with threaded holes, so that the extension arm 322 can be detachably connected to the heat sink 12 by the second bolt 34. In particular, since the heat sink 12 has a large overall weight, it is easy to cause shaking due to loose installation during the movement and printing of the print head 100, resulting in a decrease in the printing accuracy of the nozzle 22. Therefore, on the basis of setting the support platform 321 and the extension arm 322, the first bolt 33 and the second bolt 34 are set to ensure the connection strength between the support platform 321 and the base 31 and the extension arm 322 and the heat sink 12, thereby ensuring the connection strength between the heat sink 12 and the nozzle 22 located at the bottom, to ensure the overall installation firmness of the heat sink 12, and also to facilitate the disassembly and assembly of the connecting seat 32 and the base 31 and the disassembly and assembly of the connecting seat 32 and the heat sink 12.

[0064] Furthermore, the first bolt 33 and the second bolt 34 can also be configured as a quick-release assembly 3 having a porous structure or a composite structure, or as a heat-insulating material such as stainless steel, polymer, or fiber material, so as to reduce heat conduction between the base 31 and the connecting seat 32 , and between the connecting seat 32 and the heat sink 12 .

[0065] In one embodiment, the first bolt 33 and the second bolt 34 are made of stainless steel; it is understandable that the first bolt 33 and the second bolt 34 are made of stainless steel. Compared with traditional carbon steel bolts, bolts made of stainless steel have lower thermal conductivity and better thermal insulation performance, which can effectively isolate heat conduction from the base 31 to the connecting seat 32 and from the connecting seat 32 to the heat sink 12, thereby reducing heat conduction from the nozzle 22 to the heat sink 12, and the stainless steel material has a high strength, which can ensure the connection strength between the base 31 and the connecting seat 32 and between the connecting seat 32 and the heat sink 12, and ensure the connection stability of the heat sink 12.

[0066] Alternatively, if Figure 4 and Figure 6As shown, the screwing direction of the first bolt 33 is the same as the extension direction of the tube body of the feed pipe 11, and the screwing direction of the second bolt 34 is perpendicular to the screwing direction of 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, and it is preferred to set the screwing direction of the first bolt 33 to be the same as the extension direction of the tube body of the feed pipe 11, so that the support platform 321 can open a threaded hole along the extension direction of the tube body of the feed pipe 11, and be connected to the base 31 through the first bolt 33. At the same time, the first bolt 33 is used to connect the heat sink 12 and the connecting seat 32, and it is preferred to set the screwing direction of the second bolt 34 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 through the second bolt 34 at a direction perpendicular to the extension direction of the tube body of the feed pipe 11, that is, at the side wall of the heat sink 12, thereby reducing the influence of other components on the disassembly and assembly of the heat sink 12, and making the disassembly and assembly between the quick-release assembly 3 and the heat sink 12 more convenient and quick.

[0067] In one embodiment, if 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.

[0068] 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 the 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 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, a heat insulation sheet, a heat insulation pad, a heat insulation blanket, or a heat insulation The block or the like has a layered or porous heat-insulating structure, or it can block the heat transfer through its special materials, such as foam material, fiber material or material with a reflective coating on the surface, etc., and the isolation pad 35 can also be a multi-layer or porous buffer structure. At the same time, the isolation pad 35 is arranged on the first bolt 33 and / or the second bolt 34, and can also prevent the first bolt 33 and / or the second bolt 34 from loosening, and 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.

[0069] Specifically, there may be an installation gap in the area where the base 31 and the support platform 321 of the connecting seat 32 are connected, which makes it easy for heat to be transferred from the base 31 to the heat sink 12. Therefore, an isolation pad 35 can be set between the connecting seat 32 and the base 31. The isolation pad 35 can only cover the area where the support platform 321 abuts the base 31, or it can cover the area on the side of the entire base 31 facing the heat sink 12, which is not limited here.

[0070] 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 is inevitable that the heat at the nozzle 22 will be transferred to the connecting seat 32 and the heat sink 12. Therefore, an isolation pad 35 can be set between the first bolt 33 and the base 31 to isolate the heat transfer.

[0071] 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 insulating member 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 enhance the heat dissipation capacity of the heat sink 12 to the feed pipe 11.

[0072] At the same time, when the heat sink 12 is connected to the feed pipe 11, the heat sink 12 and the nozzle 22 can be directly connected through the isolation pad 35, thereby reducing the mechanical load from the heat sink 12 borne by the feed pipe 11 and reducing the force on the feed pipe 11, thereby improving the service life of the feed pipe 11 and the mechanical installation strength of the overall print head 100.

[0073] In one embodiment, the material of the connection seat 32 is polyetheretherketone with 15% to 30% glass fiber added; it is understood that polyetheretherketone has good high temperature resistance, especially in high temperature and high humidity environment, it can still maintain stable performance. After adding glass fiber, the thermal deformation temperature can be increased to 280-300°C, effectively isolating the transfer of heat. At the same time, after adding 15% to 30% glass fiber, the overall compression, bending and tensile strength and dimensional stability of the connection seat 32 can be enhanced, and the overall structural strength of the quick release component 3 and the print head 100 can be improved. Optionally, the material of the feed pipe 11 can be titanium alloy, aluminum alloy, aluminum-magnesium alloy, copper alloy and other alloy materials; it is understood that titanium alloy has high strength and rigidity, can withstand high pressure, and titanium alloy also has good high temperature resistance and good thermal diffusion ability, so that it can stably transport materials and resist high temperature, and quickly transfer the heat conducted from the nozzle 22 to the heat sink 12, improve the cooling and heat dissipation of the heat sink 12 to the feed pipe 11, and reduce the temperature rise of the feed pipe 11. Alternatively, if Figure 2 , Figure 4 as well as Figure 7As shown, the print head 100 also includes a throat 4, which is sleeved on the outer wall of the feed pipe 11, and the heat sink 12 is sleeved on the outer wall of the throat 4; it can be understood that the throat 4 is arranged on the outer wall of the feed pipe 11, and at the same time, part of the structure of the heat sink 12 is sleeved on the outer wall of the throat 4, and the throat 4 and the nozzle 22 are spaced apart. By arranging the throat 4, the area of ​​the feed pipe 11 adjacent to the nozzle 22 can be thermally isolated, and the temperature rise in the area of ​​the feed pipe 11 adjacent to the nozzle 22 can be reduced. At the same time, the throat 4 can also improve the heat transfer between the feed pipe 11 in this area and the heat sink 12, improve the heat dissipation performance of the heat sink 12 in this area, and further reduce the temperature rise in this area.

[0074] In one embodiment, if 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, and the base 31 is detachably connected to the heat-conducting seat 223.

[0075] In this embodiment, the structure of the heat-conducting seat 223 can be a tubular structure, a groove-shaped structure with three side walls, or a sheet-shaped structure (for example, the rear end extrusion tube 222 is a square tube structure, and one side wall of the rear end extrusion tube 222 is in contact with a single side of the sheet-shaped heat-conducting seat 223 for heating), etc., which is not limited here; the front end nozzle 221 and the rear end extrusion tube 222 are connected and interconnected, and the rear end extrusion tube 222 and the feed tube 11 have the same extension direction of the tube body, and are connected and communicated with each other, and the front end nozzle 221 is connected to the end of the rear end extrusion tube 222 away from the feed tube 11. The length of the rear end extrusion tube 222 along the extension direction of the tube body is greater than the length of the front end nozzle 221. At the same time, the nozzle 22 also includes a heat-conducting seat 223, which is threadedly connected to the rear end extrusion tube 222. The heating element 21, such as a ceramic heating sleeve or a ring heating wire, is sleeved on the outer periphery of the side of the heat-conducting seat 223 facing away from the front end nozzle 221. The heating element 21 heats the heat-conducting seat 223, so that the heat-conducting seat 223 heats the rear end extrusion tube 222, so as to heat the wire material in the rear end extrusion tube 222 to form a molten state and flow out from the front end nozzle 221.

[0076] It can be understood that the rear end extrusion tube 222 is located at the rear of the nozzle 22, and is usually connected to the material supply system, that is, the feed tube 11, so that the filament in the feed tube 11 enters the rear end extrusion tube 222, and is heated by the heating element 21 at the rear end extrusion tube 222 to heat and melt the filament. The front end nozzle 221 is responsible for extruding the molten material to form a printing layer. At the same time, the front end nozzle 221 can also adjust the thickness and pressure of the printing line to adapt to different printing scenarios and different printing requirements.

[0077] In one embodiment, if Figure 1 , Figure 2 , Figure 4 as well as Fig. 9 As shown, the heat sink 12 includes a heat sink body 121 and a plurality of heat sinks 122 , wherein the plurality of heat sinks 122 are arranged in parallel and at intervals on the heat sink body 121 ; the heat sink 12 is provided with a heat insulation groove 123 , which passes through the heat sink body 121 and the heat sink 122 .

[0078] It can be understood that the heat insulation groove 123 runs through the heat dissipation body 121 and the heat dissipation fin 122, and the heat insulation groove 123 is located on part of the heat dissipation body 121 and the heat dissipation fin 122. When the heat of the connecting seat 32 is transferred to the heat dissipation body 121 and the heat dissipation fin 122, due to the addition of the heat insulation groove 123, the heat transfer medium at this location is air, and the heat transfer efficiency of the air is reduced, so that the efficiency of heat transfer is also reduced, thereby reducing the heat transfer of the nozzle 22 to the heat dissipation element 12 through the connecting seat 32, reducing the heat absorption at the throat 4 and the feed pipe 11, and increasing the cooling speed of the wire material, which facilitates smooth wire feeding.

[0079] In one embodiment, if Figures 1 to 4 as well as Figure 7 , Figure 8 As shown, the feed pipe 11 includes a main section 111 and a connecting section 112, the main section 111 is connected to the heat sink 12; one end of the connecting section 112 is connected to the main section 111, and the other end of the connecting section 112 is connected to the nozzle 22, and the wall thickness of the connecting section 112 is less than the wall thickness of the main section 111.

[0080] In this embodiment, the feed pipe 11 is made of titanium alloy, and the feed pipe 11 is sequentially arranged into a main section 111 and a connecting section 112 along the extension direction of the tube body. The connecting section 112 and the main section 111 are interconnected and communicated with each other, wherein the main section 111 is connected to the heat sink 12, one end of the connecting section 112 is connected to the main section 111 and communicated with the main section 111, and the other end of the connecting section 112 is connected to the rear end extrusion tube 222 in the nozzle 22 by interference fit, and communicated with the rear end extrusion tube 222.

[0081] Among them, the tube wall thickness of the connecting section 112 is smaller than the tube wall thickness of the main section 111, and the tube wall thickness of the connecting section 112 is set at 0.3mm to 0.5mm (including the values ​​at both ends). Preferably, the tube wall thickness of the connecting section 112 is set to 0.4mm, and the tube wall thickness of the main section 111 is greater than the tube wall thickness of the connecting section 112. Since the tube wall thickness at the connecting section 112 is thinner, the volume of the titanium alloy at the connecting section 112 is smaller than the volume of the titanium alloy at the main section 111. Less material can more effectively block heat transfer, further isolate the heat conduction between the main section 111 where the feed pipe 11 is connected to the heat sink 12 and the nozzle 22, reduce the heat conducted from the rear end extrusion tube 222 to the main section 111 and the heat sink 12 through the connecting section 112, ensure 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 wire material.

[0082] In another embodiment of the present invention, the main body section 111 includes a first mounting section 1111 and a second mounting section 1112, the second mounting section 1112 is located between the first mounting section 1111 and the connecting section 112, the second mounting section 1112 is connected to the first mounting section 1111 and the connecting section 112 along both ends of the tube body, and the second mounting section 1112 is connected to the first mounting section 1111 and the connecting section 112, wherein the wall thickness of the second mounting section 1112 is less than the wall thickness of the first mounting section 1111 and is greater than the wall thickness of the connecting section 112, and the wall thickness of the second mounting section 1112 is less than the wall thickness of the first mounting section 1111 and is greater than the wall thickness of the connecting section 112, and the wall thickness of the second mounting section 1112 is greater than the wall thickness of the connecting section 112, and the wall thickness of the second mounting section 1112 is greater than the wall thickness of the connecting section 112, and the wall thickness of the second mounting section 1112 is greater than the wall thickness of the connecting section 112. The stepped structure with gradually decreasing tube wall thickness can, on the one hand, further reduce the heat conduction from the nozzle 22 to the heat sink 12 arranged around the feed pipe 11, and on the other hand, facilitate the installation of the throat 4 at the step between the second mounting section 1112 and the first mounting section 1111, thereby improving the installation strength and stability between the main 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, through the mutual abutment between the inner and outer side walls of the throat 4 and the second mounting section 1112 and the heat sink 12, the heat dissipation effect of the heat sink 12 on the main section 111 of the feed pipe 11 can also be effectively increased, thereby effectively reducing the overall temperature rise of the feed pipe 11 at the main section 111.

[0083] The present invention further provides a 3D printing device, which includes the print head 100 as described above, and the print head 100 is provided with a protective cover 5 on the periphery of the heating element 21 to protect the internal nozzle 22 and the heating element 21, and also to prevent the operator from being scalded by the heating element 21. The specific structure of the print head 100 refers to the above-mentioned embodiment. Since the present 3D printing device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0084] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A print head, characterized in that: The print head comprises: A cooling assembly, the cooling assembly comprising a heat sink and a feed pipe extending in a first direction along the heat sink; a hot end assembly, the hot end assembly comprising a heating element and a nozzle, the nozzle having a consumables channel penetrating along the first direction, the consumables 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 the quick-release assembly is detachably connected to the heat sink and the nozzle.

2. The print head according to claim 1, wherein: 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.

3. The print head according to claim 2, wherein: The base comprises 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 screw passes through the connecting ring to tighten the nozzle.

4. The print head according to claim 3, wherein: A contact plane is provided on one side of the connecting ring facing the locking knob, and the locking knob is spirally connected to the connecting ring and contacts the contact plane. And / or, the connecting ring is provided with a mounting hole along the first direction, the nozzle passes through the mounting hole, and the hole wall of the mounting hole is threadedly connected to the nozzle.

5. The print head according to claim 3, wherein: The connecting ring is provided with at least two mounting bosses, and each of the mounting bosses is symmetrically arranged around the axis direction of the feed pipe; The quick-release assembly includes at least two connecting seats, and each connecting seat is detachably connected to one of the mounting bosses.

6. The print head according to claim 3, wherein: The nozzle is provided with a limiting groove, and the bottom wall of the limiting groove facing the locking knob is a plane; One end of the locking knob passes through the connecting ring and presses against the bottom wall of the limiting groove.

7. The print head according to claim 6, wherein: The side wall of the limiting groove is inclined so that the cross-sectional area of ​​the limiting groove gradually decreases from being adjacent to the locking knob to being away from the locking knob.

8. The print head according to claim 6, wherein: The quick-release assembly further comprises a positioning member, and the positioning member is movably disposed on the base; The nozzle is provided with a positioning groove, and the positioning groove and the limiting groove are arranged to be opposite to each other along the screwing direction of the locking knob, and the positioning member is limited in the positioning groove.

9. The print head according to claim 8, wherein: The positioning member is provided with a step portion, a thin section of the step portion is limited in the limiting groove, and a thick section of the step portion is threadedly connected to the base; And / or, the surface where the base abuts against the positioning member is a plane.

10. The print head according to claim 3, wherein: The quick-release assembly further comprises a locking nut, which is screwed to the locking knob and pressed against the connecting ring; The screwing direction of the anti-loosening nut is the same as the screwing direction of the locking knob.

11. The print head according to any one of claims 2 to 10, characterized in that The connecting base includes a supporting platform and an extension arm, and the supporting platform is detachably connected to the base; The extension arm is connected to the support platform and extends in a direction away from the support platform so as to be detachably connected to the heat sink.

12. The print head according to claim 11, wherein: 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; The extension arm is connected to the heat sink through the second bolt.

13. The print head according to claim 12, wherein: The quick-release assembly further 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 an isolation pad, which is sleeved on the first bolt and located between the first bolt and the base; And / or, the quick-release assembly further includes an isolation pad, which is sleeved on the second bolt and located between the second bolt and the heat sink.

14. The print head according to any one of claims 2 to 10, characterized in that The material of the connecting seat is polyetheretherketone added with 15% to 30% glass fiber; And / or, the print head further comprises a throat, the throat is sleeved on the outer wall of the feed pipe, and the heat sink is sleeved on the outer wall of the throat; And / or, the feed pipe is made of stainless steel or alloy steel.

15. The print head according to any one of claims 2 to 10, characterized in that The heat sink comprises a heat sink body and a plurality of heat sinks, wherein the plurality of heat sinks are arranged in parallel and at intervals on the heat sink body; The heat dissipation element is provided with a heat insulation groove, and the heat insulation groove runs through the heat dissipation body and the heat dissipation fin.

16. The print head according to any one of claims 2 to 10, characterized in that The feed pipe comprises a main body section and a connecting section, and the main body section is connected to the heat sink; One end of the connecting section is connected to the main section, and the other end of the connecting section is connected to the nozzle. The thickness of the tube wall of the connecting section is smaller than the thickness of the tube wall of the main section.

17. A 3D printing device, characterized in that: The 3D printing device comprises a print head as claimed in any one of claims 1 to 16.

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