Heated seat assembly, print head and 3D printer

Abstract

This application relates to the field of 3D printing and aims to solve the problem of inconvenient disassembly of the hot-end device in some known 3D printers, providing a heating seat assembly, a print head, and a 3D printer. The heating seat assembly includes a heating seat, a limiting member, and a hot-end device. The heating seat has a first slot. A first end of the limiting member is movably connected to the heating seat, and a second end of the limiting member can be selectively located within or outside the first slot. The hot-end device includes a heat sink, a heat conductor, a throat, and a nozzle. The heat conductor and the heat sink are spaced apart. A portion of the throat contacts the heat conductor, and another portion of the throat contacts the heat sink. The nozzle is connected to the heat conductor and communicates with the throat. The hot-end device is detachably disposed between the heating seat and the limiting member. The beneficial effect of this application is that the hot-end device is easy to disassemble.

Description

Technical Field

[0001] This application relates to the field of 3D printing, and more specifically, to heated mount assemblies, print heads, and 3D printers. Background Technology

[0002] A 3D printer (also known as a stereo printer or three-dimensional printer) is a rapid prototyping process. Currently, the 3D printing technology that can be used is fused deposition modeling (FDM). FDM is a technology that constructs three-dimensional objects by printing layer by layer using powdered materials such as metal or plastic based on digital models. In practice, an FDM 3D printer uses a feeding mechanism to supply molten filament material to the hot-end device of the printer. The molten filament material is heated to a molten state within the hot-end device. The hot-end device then extrudes the molten material onto the forming platform as it moves along the printing path of the 3D printer, printing the three-dimensional object layer by layer.

[0003] In the process of developing this application, the inventors discovered that at least the following problems exist in the known technologies: some known 3D printers have the problem of inconvenient disassembly of the hot end device. Utility Model Content

[0004] This application provides a heating mount assembly, a print head, and a 3D printer to solve the problem of inconvenient disassembly of the hot end device in some known 3D printers.

[0005] In a first aspect, embodiments of this application provide a heating seat assembly, which includes a heating seat, a limiting member, and a hot-end device. The heating seat is provided with a first slot. A first end of the limiting member is movably connected to the heating seat, and a second end of the limiting member is selectively located within or outside the first slot. The hot-end device includes a heat dissipation member, a heat conduction member, a throat, and a nozzle. The heat conduction member and the heat dissipation member are spaced apart. A portion of the throat contacts the heat conduction member, and another portion of the throat contacts the heat dissipation member. The nozzle is connected to the heat conduction member and communicates with the throat. The hot-end device is detachably disposed between the heating seat and the limiting member.

[0006] In one possible implementation, the limiting member includes a connected rotating shaft portion, a pressing portion, and a snap-fit ​​portion. The rotating shaft portion is located at the first end of the limiting member, the snap-fit ​​portion is located at the second end of the limiting member, the pressing portion connects the rotating shaft portion and the snap-fit ​​portion, and the hot end device is detachably disposed between the heating base and the pressing portion.

[0007] In one possible implementation, the snap-fit ​​portion extends along an arc-shaped curve.

[0008] In one possible implementation, the heat-conducting element has a limiting groove, and the heat-conducting element is detachably disposed between the heating base and the pressing part. When the heat-conducting element is disposed between the heating base and the pressing part, the pressing part contacts the multiple groove walls forming the limiting groove.

[0009] In one possible implementation, the plurality of groove walls include a first groove wall and a second groove wall arranged along the arrangement direction of the heat dissipation element and the heat conduction element. When the heat conduction element is disposed between the heating base and the holding part, the holding part contacts the first groove wall and / or contacts the second groove wall.

[0010] In one possible implementation, the heating base assembly further includes a connecting frame and a heat insulation element, the heat insulation element connecting the heating base and the connecting frame.

[0011] In one possible implementation, the connecting frame has a throat hole, and when the hot end device is disposed between the heating seat and the limiting member, the throat tube contacts the wall of the throat hole.

[0012] Secondly, embodiments of this application provide a printhead, which includes a printhead body and a heating seat assembly. The heating seat assembly includes a heating seat, a limiting member, and a hot end device. The heating seat is fixed to the printhead body and has a first slot. The limiting member is movably connected to the heating seat and can selectively contact or separate from the slot wall of the first slot. The hot end device includes a heat dissipation member, a heat conduction member, a throat, and a nozzle. The heat conduction member and the heat dissipation member are spaced apart. The throat connects the heat conduction member and the heat dissipation member. The nozzle is connected to the heat conduction member and communicates with the throat. The hot end device is detachably disposed between the heating seat and the limiting member.

[0013] In one possible implementation, the limiting member includes a connected rotating shaft portion and a pressing portion. The heating seat is provided with a rotating shaft groove, and the rotating shaft portion is rotatably mounted in the rotating shaft groove. When the hot end device is disposed between the heating seat and the limiting member, the pressing portion contacts the heat-conducting component.

[0014] In one possible implementation, the limiting member further includes a snap-fit ​​portion connected to the end of the holding portion away from the rotating shaft portion, and the snap-fit ​​portion can selectively contact or separate from the groove wall of the first slot.

[0015] In one possible implementation, the heat-conducting element is detachably disposed between the heating base and the holding part, and when the heat-conducting element is disposed between the heating base and the holding part, the holding part fixes the heat-conducting element in at least two non-parallel directions.

[0016] In one possible implementation, at least two directions include the arrangement directions of the heat sink and the heat conductor.

[0017] In one possible implementation, the heating base assembly further includes a connecting frame and a heat insulation element. The connecting frame includes a first frame plate and a second frame plate. One end of the first frame plate is connected to the heating base via the heat insulation element, and the other end of the first frame plate is connected to one end of the second frame plate.

[0018] In one possible implementation, a throat hole is provided at the other end of the second frame plate, and the throat is located in the throat hole when the hot end device is disposed between the heating seat and the limiting member.

[0019] Thirdly, embodiments of this application provide a 3D printer, which includes a forming platform and a print head. The print head includes a print head body and a heating seat assembly. The print head body is movable relative to the forming platform. The heating seat assembly includes a heating seat, a limiting member, and a hot end device. The heating seat is fixed to the print head body and defines an installation groove with an opening. The heating seat also has a first slot. The limiting member is movably connected to the heating seat and can selectively contact or separate from the groove wall of the first slot. The limiting member is used to open and close the opening. The hot end device includes a heat dissipation member, a heat conduction member, a throat, and a nozzle. In the extension direction of the throat, the heat conduction member and the heat dissipation member are spaced apart and contact each other. The heat conduction member and the heat dissipation member are in contact with the throat. The nozzle is connected to the heat conduction member and communicates with the throat. The hot end device is detachably disposed in the installation groove.

[0020] In one possible implementation, the opening is located on one side of the mounting slot in the first direction, and the first slot is located on one side of the heating seat in the second direction, the first direction and the second direction being different.

[0021] In one possible implementation, the limiting member includes a connected holding portion and a snap-fit ​​portion. The holding portion includes a holding plate for opening and closing the opening. The snap-fit ​​portion extends in a curved manner relative to the holding portion and can selectively contact or separate from the groove wall of the first slot.

[0022] In one possible implementation, the heat-conducting component is provided with a limiting groove, and when the snap-fit ​​portion contacts the first snap-fit ​​groove, the pressure plate engages with the limiting groove.

[0023] In one possible implementation, when the snap-fit ​​portion contacts the first slot, the hot end device is fixed to the mounting slot in the arrangement direction of the heat sink and the heat conductor.

[0024] In one possible implementation, the heating base assembly further includes a connecting frame and a heat insulation element, one end of which contacts the heating base and the other end of which contacts the connecting frame.

[0025] One of the above technical solutions has the following advantages or beneficial effects: the heating seat assembly, print head and 3D printer in the embodiments of this application can be easily disassembled and assembled by the limiting member being inserted into or removed from the first slot. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a 3D printer according to an embodiment of this application.

[0028] Figure 2 This is a cross-sectional view of the printhead in an embodiment of this application.

[0029] Figure 3 This is a perspective view of the heating seat assembly according to an embodiment of this application.

[0030] Figure 4 for Figure 3 Exploded view of the heating seat assembly.

[0031] Figure 5 for Figure 3 A longitudinal sectional view of the heating seat assembly.

[0032] Figure 6 for Figure 3 A cross-sectional view of the heating seat assembly.

[0033] Figure 7 This is a perspective view of the limiting member according to an embodiment of this application.

[0034] Figure 8 This is a perspective view of the heating base according to an embodiment of this application.

[0035] Figure 9 This is an exploded view of a portion of the structure of the heating seat assembly according to an embodiment of this application.

[0036] Key component symbols: 500 - 3D printer; 510 - Molding platform; 520 - Frame; 521 - Base; 522 - Gantry; 522a - Column; 522b - Crossbeam; 530 - Optical axis; 300 - Print head; 310 - Print head body; 311 - Substrate; 312 - Front shell; 320 - Extrusion assembly; 321 - Driving extrusion wheel; 322 - Driven extrusion wheel; 323 - Driving gear; 324 - Driven gear; T1 - Consumable channel; 700 - Consumable; 100 - Heating seat assembly; 10 - Heating seat; C1 - First slot; C3 - Rotary shaft slot; C2 - Second slot; C4 - Mounting slot; K1 - Opening; 20 - Limiting component ; 21-First end; 22-Second end; 23-Rotating shaft; 24-Pressure holding part; 24a-Pressure holding plate; 25-Snap-fit ​​part; 40-Hot end device; 41-Heat dissipation component; 42-Heat conduction component; C5-Limiting groove; P1-Groove wall; P11-First groove wall; P12-Second groove wall; 43-Throat; 44-Nozzle; 50-Connecting frame; 51-First frame plate; 52-Second frame plate; Q1-Installation space; K2-Throat hole; 61-Heating element; 62-Heat insulation component; 63-Pressure holding component; 63a-Back plate; 63b-Side plate; 63c-Inner fold; 63d-Elastic tongue plate; 64-Temperature detection element; Y1-First direction; X1-Second direction. Detailed Implementation

[0037] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0038] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] Example See Figure 1 This embodiment also provides a 3D printer 500, which can specifically be a 3D printer 500 based on FDM technology.

[0042] The 3D printer 500 includes a frame 520, a forming platform 510, a print head 300, and displacement components in the X, Y, and Z directions. The X direction can be a horizontal direction, the Y direction can be a horizontal forward-backward direction, and the Z direction can be a vertical direction or a vertical direction.

[0043] The printhead 300 and the forming platform 510 move relative to each other in a controlled manner under the drive of the displacement components. For example, the forming platform 510 can be displaced relative to the frame 520 in the Y direction under the drive of the Y-direction displacement component, and the printhead 300 can be displaced in the X and / or Z directions under the drive of the X-direction displacement components and the Z-direction displacement components, heating and melting the consumables according to a set path, and printing them onto the forming platform 510 to form a printed part. The X, Y, and Z-direction displacement components can be driven by lead screws and nuts, belts, or other mechanisms, and are not limited here.

[0044] In this embodiment, optionally, the frame 520 includes a base 521 and a gantry 522, with the gantry 522 connected to the base 521. The forming platform 510 is movably disposed on the base 521 along the Y-direction. The gantry 522 includes two columns 522a spaced apart along the X-direction and a crossbeam 522b connected to the ends of the two columns 522a away from the base 521, wherein the columns 522a extend along the Z-direction. The crossbeam 522b and the columns 522a can be integrally formed or are separate structures connected by bolts or other connecting components. An optical axis 530 movable along the Z-direction is connected between the two columns 522a, and the print head 300 is movably disposed on the optical axis 530 along the X-direction. Thus, the print head 300 can be displaced along the X-direction on the optical axis 530, and / or displaced along the Z-direction together with the optical axis 530.

[0045] In other embodiments, the rack 520 may also take other forms of structure, which are not limited here.

[0046] In other embodiments, the movement of the print head 300 and the forming platform 510 can also take other forms. For example, the forming platform 510 may remain stationary, while the print head 300 may be displaced relative to the forming platform 510 along the X, Y, and Z directions, respectively. Alternatively, the forming platform 510 may be displaced along the X and Y directions, while the print head 300 may be displaced along the Z direction.

[0047] In some embodiments, the 3D printer 500 may further include a housing that defines a receiving cavity in which the print head 300 and the forming platform 510 are both disposed. The housing separates the internal and external spaces of the 3D printer 500 to ensure a stable printing environment. A door that can be opened or closed may be provided on the housing to facilitate the removal of the printed parts.

[0048] See Figure 1 and Figure 2 (in, Figure 2 (The limiting member 30, locking structure 20, and outer sleeve 45 are not shown.) In this embodiment, the printhead 300 includes a printhead body 310 and a heating seat assembly 100.

[0049] The printhead body 310 is movable relative to the forming platform 510. For example, the printhead body 310 is slidably disposed on the optical axis 530 along the X direction, so that the printhead body 310 can move along the X direction relative to the optical axis 530, or move along the Z direction together with the optical axis 530. The forming platform 510 is slidably disposed along the Y direction. Thus, the printhead body 310 and the forming platform 510 are movable relative to each other.

[0050] Optionally, the printhead body 310 may include a substrate 311 and a front shell 312. The substrate 311 is slidably connected to the optical axis 530, the front shell 312 is connected to the substrate 311, and the heating seat assembly 100 is installed between the front shell 312 and the substrate 311. The heating seat assembly 100 can move synchronously with the printhead body 310.

[0051] The printhead 300 may also include an extrusion assembly 320. The extrusion assembly 320 is fixed relative to the heating seat assembly 100; for example, the extrusion assembly 320 and the heating seat assembly 100 are respectively fixedly mounted on the printhead body 310 so that they can move synchronously. The extrusion assembly 320 is used to feed consumable 700 to the heating seat assembly 100. The heating seat assembly 100 is located below the extrusion assembly 320 in the Z direction and is used to receive the consumable 700 fed by the extrusion assembly 320, heat and melt the consumable 700, and print it onto the forming platform 510 to form a printed part.

[0052] Among them, consumable 700 can be a linear polymer material, also known as filament. Examples of consumable 700 include PLA (Polylactic Acid), PETG (Polyethylene Terephthalate Glycol), TPU (Thermoplastic Polyurethane), PVA (Polyvinyl Alcohol), BVOH (Butylene Vinyl Alcohol Copolymer), ABS (Acrylonitrile Butadiene Styrene), ASA (Acrylonitrile Styrene Acrylate), PC (Polycarbonate), PA (Polyamide), PET (Polyethylene Terephthalate), and PPS (Polyphenylene Powder). Sulfide (polyphenylene sulfide), carbon fiber reinforced materials (referring to a mixture of PLA and other base materials with carbon fiber), or glass fiber reinforced materials (referring to a mixture of PLA and other base materials with glass fiber), etc.

[0053] The extrusion assembly 320 may include a driving extrusion wheel 321 and a driven extrusion wheel 322, defining a consumable channel T1 between them. In use, consumables (such as linear consumables) are placed into the consumable channel T1 and clamped by the driving and driven extrusion wheels 321 and 322. The driving and driven extrusion wheels 321 and 322 then rotate in opposite directions to deliver the consumables to the heating seat assembly 100. In some embodiments, the extrusion assembly 320 further includes a driving gear 323 and a driven gear 324. The driving and driven gears 323 and 324 mesh with each other, with the driving extrusion wheel 321 fixed to the driving gear 323 and the driven extrusion wheel 322 fixed to the driven gear 324. Thus, when the drive gear 323 is driven to rotate (such as when it is driven by a motor), it will drive the driven gear 324 to rotate synchronously in the opposite direction. This will enable the drive extrusion wheel 321 and the driven extrusion wheel 322 to rotate, thereby realizing the delivery of consumables.

[0054] The consumable 700 can be wound on a tray, and the consumable 700 is conveyed to the consumable channel T1 by the rolling of the tray. The tray can be set inside the material box. Understandably, multiple trays can be set inside the material box, and the material and / or color of the consumable 700 wound on different trays can be the same or different.

[0055] In other embodiments, the printhead 300 may also exclude the extrusion assembly 320. In this case, the extrusion assembly 320 may be arranged at a remote end, for example, the extrusion assembly 320 may be fixedly mounted to the frame 520, fixed to the end of the optical axis 530, or fixed to the material box.

[0056] The heating seat assembly 100 is described below as an example. Figures 3-9 A heating seat assembly 100 of this embodiment is shown.

[0057] See Figure 3 This embodiment provides a heating seat assembly 100, which can be used in the print head 300 of a 3D printer 500 (such as an FDM 3D printer 500). The heating seat assembly 100 can heat the consumable so that the consumable can be extruded in a molten state.

[0058] See Figures 3-6 The heating seat assembly 100 includes a heating seat 10, a limiting member 20, and a hot end device 40.

[0059] The heating base 10 is provided with a first slot C1. The first end 21 of the limiting member 20 is movably connected to the heating base 10, and the second end 22 of the limiting member 20 can be selectively located inside or outside the first slot C1.

[0060] The hot end device 40 includes a heat sink 41, a heat conductor 42, a throat 43, and a nozzle 44. The heat conductor 42 and the heat sink 41 are spaced apart. A part of the throat 43 is in contact with the heat conductor 42, and another part of the throat 43 is in contact with the heat sink 41. The nozzle 44 is connected to the heat conductor 42 and communicates with the throat 43. The hot end device 40 is detachably disposed between the heating base 10 and the limiting member 20.

[0061] In this embodiment, when the second end 22 of the limiting member 20 is located within the first slot C1, the second end 22 of the limiting member 20 is not easily disengaged from the heating base 10. The limiting member 20 can reliably limit the heat-conducting member 42 within the heating base 10, ensuring that the heat from the heating base 10 can be transferred to the heat-conducting member 42. Furthermore, when it is necessary to disassemble the hot end device 40, simply moving the limiting member 20 under external force until the second end 22 disengages from the first slot C1 releases the limiting of the heat-conducting member 42, at which point the hot end device 40 can be removed from the heating base 10. Thus, the heating base assembly 100 of this embodiment can reliably limit the hot end device 40, and the hot end device 40 is easy to assemble and disassemble.

[0062] Understandably, the hot end device 40 is detachably disposed on the heating base 10, and the limiting member 20 is used to fix the hot end device 40 to the heating base 10 or to remove the hot end device 40 from the heating base 10. In some embodiments, the hot end device 40 can be completely removed from the heating base 10; in other embodiments, the hot end device 40 can be partially removed from the heating base 10, such as only the heat-conducting element 42, the throat 43, and the nozzle 44 can be removed from the heating base 10.

[0063] The heat-conducting element 42 is made of a heat-conducting material and is able to melt the consumable 700 passing through it under the heating of the heating element 61 (such as an electric heating element).

[0064] Combination Figure 6 and Figure 7 In this embodiment, optionally, the limiting member 20 includes a connected rotating shaft portion 23, a pressing portion 24, and a snap-fit ​​portion 25. The rotating shaft portion 23 is located at the first end 21 of the limiting member 20, the snap-fit ​​portion 25 is located at the second end 22 of the limiting member 20, and the pressing portion 24 connects the rotating shaft portion 23 and the snap-fit ​​portion 25. The hot end device 40 is detachably disposed between the heating base 10 and the pressing portion 24. For example, the heat-conducting element 42 of the hot end device 40 is detachably disposed between the heating base 10 and the pressing portion 24. In this way, the limiting member 20 can easily move its second end 22 into and out of the first slot C1 by rotating relative to the heating base 10 via the rotating shaft portion 23. Meanwhile, the limiting member 20 can be fixed to the heating seat 10 by the rotating shaft part 23 and the snap-fit ​​part 25 at both ends, so that the middle pressing part 24 can reliably apply a force toward the heating seat 10 to the heat-conducting member 42, ensuring that the heat-conducting member 42 can be in close contact with the heating seat 10, so as to ensure that there is a high heat conduction efficiency between the heat-conducting member 42 and the heating seat 10.

[0065] Optionally, the heating base 10 is provided with a rotating shaft groove C3, and the rotating shaft portion 23 is rotatably mounted in the rotating shaft groove C3. When the hot end device 40 is disposed between the heating base 10 and the limiting member 20, the pressing portion 24 contacts the heat-conducting member 42. For example, the side of the heating base 10 connected to the rotating shaft portion 23 is provided with a rotating shaft groove C3 (see...). Figure 8 The rotating shaft portion 23 is partially housed within the rotating shaft groove C3 and rotatably connected between the upper and lower end faces of the rotating shaft groove C3. For example, the rotating shaft portion 23 is pivotally connected between the upper and lower end faces of the rotating shaft groove C3 by a pin. The rotating shaft groove C3 may be formed at the front end of the heating base 10 on one side in the X direction, and the rotating shaft groove C3 may be defined by the upper end face, the lower end face, and the rear groove bottom.

[0066] In addition, when the heat-conducting component 42 is pressed against the heating seat 10 by the limiting component 20, the cantilever length of the hot end device 40 is relatively short, which helps to ensure the stable and reliable position of the consumable 700 outlet (i.e. the outlet of the nozzle 44) of the hot end device 40, and can reduce the stress deformation of the throat 43.

[0067] In contrast, in some known technologies, the component that is pressed by the hot end device 40 is the heat sink 41, and the cantilever length of the hot end device 40 is relatively long. In this case, it is relatively difficult to ensure the positional accuracy of the nozzle 44. Furthermore, the horizontal load acting on the nozzle 44 and the heat conductor 42 and other structures will generate a bending moment at the throat 43, making the throat 43 prone to bending deformation.

[0068] Optionally, the engaging portion 25 extends in an arc shape, allowing it to engage with or disengage from the first slot C1 through elastic deformation. The engaging portion 25 may, for example, be approximately hook-shaped, comprising a 3 / 4 annular ring, with its end elastically engaging within the first slot C1 to ensure that it is not easily disengaged from the first slot C1 when engaged. The center of the arc-shaped engaging portion 25 may lie on the straight line of the extending direction of the holding portion 24 (which extends along the X direction), or it may not lie on the straight line of the extending direction of the holding portion 24 (which extends along the X direction). For example, the center of the engaging portion 25 may lie on the side of the straight line of the extending direction of the holding portion 24 closer to the heating base 10. The engaging portion 25 may protrude at least partially from the holding portion 24 away from the heating base 10 to facilitate user operation.

[0069] The holding portion 24 and the engaging portion 25 of the limiting member 20 can be formed by bending an elastic metal sheet. In this way, the engaging portion 25 can be engaged into or disengaged from the first slot C1 by elastic deformation under external force. The first slot C1 can be formed on the outer surface of one side of the heating base 10 in the X direction. The first slot C1 can be at least partially defined by an arc-shaped groove wall to ensure the fixing effect with the engaging portion 25.

[0070] See also Figure 4 and Figure 5 In one embodiment, the heat-conducting element 42 has a limiting groove C5. The heat-conducting element 42 is detachably disposed between the heating base 10 and the holding part 24. When the heat-conducting element 42 is disposed between the heating base 10 and the holding part 24, the holding part 24 contacts the plurality of groove walls P1 forming the limiting groove C5. Thus, the holding part 24 not only presses the heat-conducting element 42 tightly against the heating base 10, but also positions the heat-conducting element 42. The front end of the heat-conducting element 42 may have a limiting groove C5, and the plurality of groove walls P1 may be defined by an upper groove wall, a lower groove wall, and a rear groove wall, all of which may be planar.

[0071] In this embodiment, the heat-conducting element 42 is detachably disposed between the heating base 10 and the holding part 24. When the heat-conducting element 42 is disposed between the heating base 10 and the holding part 24, the holding part 24 fixes the heat-conducting element 42 in at least two non-parallel directions. These two directions may include the arrangement direction of the heat sink 41 and the heat-conducting element 42 (such as the Z direction), or they may include the Y direction. By fixing the heat-conducting element 42 in at least two non-parallel directions, the holding part 24 can ensure that the heat-conducting element 42 is fixed in multiple directional positions, thereby improving the installation accuracy and firmness of the heat-conducting element 42.

[0072] Optionally, the plurality of groove walls P1 include a first groove wall P11 and a second groove wall P12 arranged along the arrangement direction of the heat sink 41 and the heat conductor 42 (e.g., parallel to the Z-direction of the 3D printer 500). When the heat conductor 42 is disposed between the heating base 10 and the holding portion 24, the holding portion 24 contacts the first groove wall P11 and / or contacts the second groove wall P12. In this way, the holding portion 24 can position the heat conductor 42 along the Z-direction, and the heat conductor 42 can also be supported on the holding portion 24, so that the gravity of the heat conductor 42 and the hot end device 40 can be conducted to the heating base 10.

[0073] See you again Figures 3-5 In some embodiments, the heating base assembly 100 further includes a connecting frame 50 and a heat insulation member 62. The heat insulation member 62 connects the heating base 10 and the connecting frame 50. Optionally, the heat insulation member 62 is made of heat-insulating material, which can reduce the efficiency of heat transfer from the heating base 10 to the connecting frame 50. The heating base 10 and the connecting frame 50 can be connected by bolts, and the heat insulation member 62 can be sleeved on the outside of the bolts.

[0074] Optionally, the connecting frame 50 includes a first frame plate 51 and a second frame plate 52, with one end of the second frame plate 52 connected to the first frame plate 51 and the other end connected to the heat insulation member 62. The heating base 10 is connected to the side of the heat insulation member 62 opposite to the second frame plate 52.

[0075] The first frame plate 51, the heat insulation component 62, and the heating base 10 are all located on the same side of the second frame plate 52.

[0076] The heating base 10 defines a mounting groove C4 with an opening K1 for accommodating at least a portion of the heat-conducting element 42. In some embodiments, the front end of the heating base 10 may define a mounting groove C4 with an opening K1, the mounting groove C4 may be defined by a first transverse wall, a second transverse wall and a rear wall, the first transverse wall and the second transverse wall being arranged along the X direction, the first transverse wall and the second transverse wall being planar, and the rear wall being an arcuate surface.

[0077] The connecting bracket 50, the heat insulation component 62, and the heating base 10 form an installation space Q1 with a horizontal opening K1. When the hot-end device 40 is installed, the heat sink 41 is housed in the installation space Q1, and the heat conductor 42 is housed in the mounting groove C4. The limiting component 20 is used to open and close the opening K1 to limit the heat conductor 42, or to allow the heat conductor 42 to separate from the heating base 10. Optionally, the opening K1 is located on one side of the mounting groove C4 in the first direction Y1, and the first slot C1 is located on one side of the heating base 10 in the second direction X1, where the first direction Y1 and the second direction X1 are different. The first direction Y1 can be parallel to the Y-direction, and the second direction X1 can be parallel to the X-direction.

[0078] In this embodiment, optionally, the connecting frame 50 has a throat hole K2. When the hot end device 40 is disposed between the heating base 10 and the limiting member 20, the throat 43 contacts the wall of the throat hole K2. Thus, the connecting frame 50 can also serve to position the throat 43.

[0079] In one embodiment, optionally, the connecting frame 50 can serve as a strain gauge support, its first support plate 51 can serve as a first sub-support for the strain gauge, and its second support plate 52 can serve as a second sub-support for the strain gauge. The throat hole K2 can extend rearward from the middle front end of the first support plate 51.

[0080] The first strain gauge sub-support extends horizontally (e.g., in the Y direction), and the second strain gauge sub-support extends vertically (i.e., in the Z direction). The upper end of the second strain gauge sub-support is fixedly connected to the rear end of the first strain gauge sub-support. The strain gauge support can be made of aluminum.

[0081] The first sub-support of the strain gauge has threaded holes at both ends of its lateral direction. The threaded holes are used to install the strain gauge support onto the printhead body.

[0082] The lower end face of the first sub-support of the strain gauge is divided into a first lower end face and a second lower end face along the front-rear direction. The second lower end face is located in front of the first lower end face. A detection unit is provided on the first lower end face. When the hot-end device is installed, the detection unit contacts the rear part of the upper end face of the heat sink. The detection unit can detect the force exerted by the heat sink on the first sub-support of the strain gauge. The measured force can be used for different purposes, such as: (1) The forming platform of a 3D printer may not be flat enough. In order to ensure the printing quality, it is necessary to detect the flatness of the forming platform so as to compensate for the up and down movement of the print head. When measuring the flatness of the forming platform, the print head moves down from the first horizontal position to the position where the nozzle contacts the forming platform. At this time, the detection unit measures one of the above-mentioned forces. The print head then moves down the same distance from the second horizontal position. At this time, the detection unit measures another of the above-mentioned forces. If the two forces are equal, the positions of the two points are horizontal; if they are not equal, it is necessary to compensate for the movement of the print head. The specific compensation is determined according to the magnitude of the two forces. The greater the difference in forces, the greater the compensation distance; the smaller the difference in forces, the smaller the compensation distance. Here, two horizontal positions are used for explanation. In practice, the above operation can be performed on multiple horizontal positions. (2) Used to detect whether the feeding of the wire is smooth. If the feeding is not smooth, the movement of the wire downstream will cause the hot end device to move downward. At this time, the force measured by the detection unit will decrease. When the force measured by the detection unit decreases, a prompt message can be issued to remind the user, or the extrusion force of the wire can be increased. (3) Used to detect the flow rate of wire material. The movement of wire material downstream will cause the hot end device to move downward. At this time, the force measured by the detection unit will become smaller. Therefore, the larger the flow rate, the smaller the force. The magnitude of the force can indicate the flow rate of the wire material.

[0083] The first lower end face can contact the front part of the upper end face of the heat sink when the hot end device is installed. Since the first lower end face is horizontal and flat, and the upper end face of the heat sink is flat, the verticality of the nozzle can be ensured when the hot end device is installed.

[0084] The lower end of the second sub-support of the strain gauge has a threaded hole, where a screw is installed. A screw washer (optional) is placed between the screw nut and the second sub-support of the strain gauge. The screw passes sequentially through the second sub-support of the strain gauge, the heat insulation gasket, and the heating base, thereby connecting the strain gauge support and the heating base. The reason for connecting the strain gauge support and the heating base is as follows: If the strain gauge support and the heating base are not connected, that is, the hot end device is only connected to the strain gauge support at the heat dissipation part, forming a cantilever beam structure with a long cantilever, which is unstable, especially at the weak throat (located in the area between the heat dissipation part and the heat conduction part), so the throat is prone to damage and deformation. However, by connecting the strain gauge support and the heating base, and the heating base is fixedly connected to the heat conduction part, the stress on the throat can be relieved and the occurrence of throat damage and deformation can be reduced.

[0085] In another embodiment, the connecting frame 50 may not serve as a strain gauge support; in this case, the strain structure can be placed in other suitable locations.

[0086] See also Figure 8 and Figure 9 In this embodiment, optionally, the heating base assembly 100 further includes a heating element 61. The heating element 61 is, for example, an electric heating element capable of generating heat when energized. The heating element 61 may be disposed on the side of the heating base 10 away from the heat-conducting element 42. Optionally, the heating element 61 is generally sheet-shaped.

[0087] Optionally, the heating base assembly 100 may further include a pressing member 63, which is detachably snapped onto the heating base 10 and can press the heating element 61 against the side of the heating base 10 away from the heat-conducting member 42. In this way, the heating element 61 can be in close contact with the heating base 10, allowing the heat from the heating element 61 to be efficiently transferred to the heating base 10. In this embodiment, the heating element 61 is fixed on the heating base 10, and the heating element 61 does not need to be removed simultaneously when disassembling the hot end device 40. Therefore, it is also unnecessary to unplug the power connector of the heating element 61, making the hot end device 40 easy to assemble and disassemble.

[0088] Optionally, the heating base 10 has second slots C2 on both sides. The pressing member 63 includes a back plate 63a and two side plates 63b, which are connected in a U-shape. The ends of the two side plates 63b facing away from the back plate 63a are folded inward to form inward folded portions 63c. The back plate 63a has an elastic tongue 63d extending towards one side of the side plate 63b. During installation, the two inward folded portions 63c of the pressing member 63 are respectively engaged into the two second slots C2. The back plate 63a is located on the side of the heating base 10 facing away from the heat-conducting member 42, and the elastic tongue 63d on the back plate 63a elastically presses the heating element 61 against the heating base 10, ensuring a reliable thermal connection between the heating element 61 and the heating base 10.

[0089] In some embodiments, the second slot C2 on one side is connected to the first slot C1. Thus, the first slot C1 and the second slot C2 can be formed simultaneously, facilitating processing. Optionally, the second slot C2 extends along the Z-direction to penetrate the lower end face of the heating base 10, so that the inward fold 63c of the pressing member 63 can engage with the second slot C2 from bottom to top along the Z-direction.

[0090] In this embodiment, optionally, the printhead 300 may also include a temperature sensing element 64. The temperature sensing element 64 is used to detect temperature. For example, the temperature sensing element 64 includes a thermistor, which is used to detect temperature. The temperature sensing element 64 may be disposed on the heating base 10. For example, the sensing head of the temperature sensing element 64 is pressed against the side of the heating base 10 by a pressing member 63 to achieve thermal coupling between the temperature sensing element 64 and the heating base 10. In this embodiment, the temperature sensing element 64 is fixed on the heating base 10, and the temperature sensing element 64 does not need to be removed when disassembling the hot end device 40. Therefore, it is not necessary to unplug the power connector of the temperature sensing element 64, making the hot end device 40 easy to assemble and disassemble.

[0091] This embodiment also provides a printhead 300, which includes a printhead body 310 and a heating seat assembly 100. The heating seat assembly 100 includes a heating seat 10, a limiting member 20, and a hot end device 40. The heating seat 10 is fixed to the printhead body 310 and has a first slot C1. The limiting member 20 is movably connected to the heating seat 10 and can selectively contact or separate from the slot wall P1 of the first slot C1. The hot end device 40 includes a heat sink 41, a heat conductor 42, a throat 43, and a nozzle 44. The heat conductor 42 and the heat sink 41 are spaced apart. The throat 43 connects the heat conductor 42 and the heat sink 41. The nozzle 44 is connected to the heat conductor 42 and communicates with the throat 43. The hot end device 40 is detachably disposed between the heating seat 10 and the limiting member 20.

[0092] In some embodiments, the limiting member 20 includes a connected rotating shaft portion 23 and a pressing portion 24. The heating seat 10 is provided with a rotating shaft groove C3, and the rotating shaft portion 23 is rotatably mounted in the rotating shaft groove C3. When the hot end device 40 is disposed between the heating seat 10 and the limiting member 20, the pressing portion 24 contacts the heat-conducting member 42.

[0093] In some embodiments, the limiting member 20 further includes a snap-fit ​​portion 25, which is connected to the end of the holding portion 24 away from the rotating shaft portion 23. The snap-fit ​​portion 25 can selectively contact or separate from the groove wall P1 of the first slot C1.

[0094] In some embodiments, the heat-conducting element 42 is detachably disposed between the heating base 10 and the holding portion 24. When the heat-conducting element 42 is disposed between the heating base 10 and the holding portion 24, the holding portion 24 fixes the heat-conducting element 42 in at least two non-parallel directions.

[0095] In some embodiments, at least two directions include the arrangement directions of the heat sink 41 and the heat conductor 42.

[0096] In some embodiments, the heating seat assembly 100 further includes a connecting frame 50 and a heat insulation member 62. The connecting frame 50 includes a first frame plate 51 and a second frame plate 52. One end of the first frame plate 51 is connected to the heating seat 10 through the heat insulation member 62, and the other end of the first frame plate 51 is connected to one end of the second frame plate 52.

[0097] In some embodiments, the other end of the second frame plate 52 is provided with a throat hole K2. When the hot end device 40 is disposed between the heating seat 10 and the limiting member 20, the throat 43 is located in the throat hole K2.

[0098] This embodiment also provides a 3D printer 500, which includes a forming platform 510 and a print head 300. The print head 300 includes a print head body 310 and a heating seat assembly 100. The print head body 310 is movable relative to the forming platform 510. The heating seat assembly 100 includes a heating seat 10, a limiting member 20, and a hot end device 40. The heating seat 10 is fixed to the print head body 310. The heating seat 10 defines a mounting groove C4 with an opening K1, and the heating seat 10 has a first slot C1. The limiting member 20 is movably connected to the heating seat 10, and the limiting member 20 can selectively engage with... The groove wall P1 of the first slot C1 is in contact with or separated from the slot. The limiting member 20 is used to open and close the opening K1. The hot end device 40 includes a heat dissipation member 41, a heat conduction member 42, a throat 43 and a nozzle 44. In the extension direction of the throat 43, the heat conduction member 42 and the heat dissipation member 41 are spaced apart. The heat conduction member 42 is in contact with the throat 43, the heat dissipation member 41 is in contact with the throat 43, the nozzle 44 is connected to the heat conduction member 42, and the nozzle 44 is in communication with the throat 43. The hot end device 40 is detachably installed in the mounting groove C4.

[0099] In some embodiments, the opening K1 is located on one side of the mounting groove C4 in the first direction Y1, and the first slot C1 is located on one side of the heating base 10 in the second direction X1. The first direction Y1 and the second direction X1 are different.

[0100] In some embodiments, the limiting member 20 includes a connected pressing portion 24 and a snap-fit ​​portion 25. The pressing portion 24 includes a pressing plate 24a for opening and closing the opening K1. The snap-fit ​​portion 25 extends in a curved manner relative to the pressing portion 24 and can selectively contact or separate from the groove wall P1 of the first slot C1.

[0101] In some embodiments, the heat-conducting member 42 is provided with a limiting groove C5, and when the snap-fit ​​portion 25 is in contact with the first snap-fit ​​groove C1, the pressure plate 24a is engaged with the limiting groove C5.

[0102] In some embodiments, when the snap-fit ​​portion 25 is in contact with the first snap-fit ​​slot C1, the hot end device 40 is fixed to the mounting slot C4 in the arrangement direction of the heat sink 41 and the heat conductor 42.

[0103] In some embodiments, the heating base assembly 100 further includes a connecting frame 50 and a heat insulation member 62, one end of which contacts the heating base 10 and the other end of which contacts the connecting frame 50.

[0104] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A heating seat assembly, characterized in that, include: Heating base, wherein the heating base is provided with a first slot; A limiting member, the first end of which is movably connected to the heating base, and the second end of which can be selectively located inside or outside the first slot; as well as A hot-end device includes a heat sink, a heat conductor, a throat, and a nozzle. The heat conductor is spaced apart from the heat sink. A portion of the throat contacts the heat conductor, and another portion of the throat contacts the heat sink. The nozzle is connected to the heat conductor and communicates with the throat. The hot-end device is detachably disposed between the heating base and the limiting member.

2. The heating seat assembly according to claim 1, characterized in that, The limiting member includes a connected rotating shaft, a pressing part, and a snap-fit ​​part. The rotating shaft is located at the first end of the limiting member, the snap-fit ​​part is located at the second end of the limiting member, the pressing part connects the rotating shaft and the snap-fit ​​part, and the hot end device is detachably disposed between the heating base and the pressing part.

3. The heating seat assembly according to claim 2, characterized in that, The snap-fit ​​portion extends along an arc-shaped curve.

4. The heating seat assembly according to claim 2, characterized in that, The heat-conducting component has a limiting groove, and the heat-conducting component is detachably disposed between the heating base and the pressing part. When the heat-conducting component is disposed between the heating base and the pressing part, the pressing part contacts the multiple groove walls forming the limiting groove.

5. The heating seat assembly according to claim 4, characterized in that, The plurality of groove walls include a first groove wall and a second groove wall arranged along the arrangement direction of the heat dissipation component and the heat conduction component. When the heat conduction component is disposed between the heating base and the holding portion, the holding portion contacts the first groove wall and / or contacts the second groove wall.

6. The heating seat assembly according to claim 1, characterized in that, The heating base assembly also includes a connecting frame and a heat insulation component, the heat insulation component connecting the heating base and the connecting frame.

7. The heating seat assembly according to claim 6, characterized in that, The connecting frame has a throat hole. When the hot end device is located between the heating seat and the limiting member, the throat tube contacts the wall of the throat hole.

8. A printhead, characterized in that, include: Print head body; as well as, A heating seat assembly includes a heating seat, a limiting member, and a hot end device. The heating seat is fixed to the printhead body and has a first slot. The limiting member is movably connected to the heating seat and can selectively contact or separate from the wall of the first slot. The hot end device includes a heat sink, a heat conductor, a throat, and a nozzle. The heat conductor and the heat sink are spaced apart. The throat connects the heat conductor and the heat sink. The nozzle is connected to the heat conductor and communicates with the throat. The hot end device is detachably disposed between the heating seat and the limiting member.

9. The printhead according to claim 8, characterized in that, The limiting member includes a connected rotating shaft portion and a pressing portion. The heating seat is provided with a rotating shaft groove, and the rotating shaft portion is rotatably mounted in the rotating shaft groove. When the hot end device is disposed between the heating seat and the limiting member, the pressing portion contacts the heat-conducting component.

10. The printhead according to claim 9, characterized in that, The limiting member also includes a snap-fit ​​part, which is connected to the end of the pressing part away from the rotating shaft part. The snap-fit ​​part can selectively contact or separate from the groove wall of the first slot.

11. The printhead according to claim 9, characterized in that, The heat-conducting element is detachably disposed between the heating base and the holding part. When the heat-conducting element is disposed between the heating base and the holding part, the holding part fixes the heat-conducting element in at least two non-parallel directions.

12. The printhead according to claim 11, characterized in that, The at least two directions include the arrangement directions of the heat sink and the heat conductor.

13. The printhead according to claim 8, characterized in that, The heating base assembly also includes a connecting frame and a heat insulation component. The connecting frame includes a first frame plate and a second frame plate. One end of the first frame plate is connected to the heating base through the heat insulation component, and the other end of the first frame plate is connected to one end of the second frame plate.

14. The printhead according to claim 13, characterized in that, The other end of the second frame plate has a throat hole. When the hot end device is located between the heating seat and the limiting member, the throat is located in the throat hole.

15. A three-dimensional printer, characterized in that, include: Molding platform; as well as, A printhead includes a printhead body and a heating seat assembly. The printhead body is movable relative to the forming platform. The heating seat assembly includes a heating seat, a limiting member, and a hot end device. The heating seat is fixed to the printhead body and defines an opening in the mounting groove. The heating seat also has a first retaining groove. The limiting member is movably connected to the heating seat and can selectively contact or separate from the groove wall of the first retaining groove. The limiting member is used to open and close the opening. The hot end device includes a heat sink, a heat conductor, a throat, and a nozzle. In the extending direction of the throat, the heat conductor and the heat sink are spaced apart and contact the throat. The heat conductor and the heat sink are in contact with the throat. The nozzle is connected to the heat conductor and communicates with the throat. The hot end device is detachably mounted in the mounting groove.

16. The three-dimensional printer according to claim 15, characterized in that, The opening is located on one side of the mounting groove in a first direction, and the first slot is located on one side of the heating seat in a second direction, wherein the first direction and the second direction are different.

17. The three-dimensional printer according to claim 15, characterized in that, The limiting member includes a connected pressing part and a snap-fit ​​part. The pressing part includes a pressing plate for opening and closing the opening. The snap-fit ​​part extends in a curved manner relative to the pressing part and can selectively contact or separate from the groove wall of the first slot.

18. The three-dimensional printer according to claim 17, characterized in that, The heat-conducting component is provided with a limiting groove. When the snap-fit ​​part is in contact with the first snap-fit ​​groove, the pressure plate is engaged with the limiting groove.

19. The three-dimensional printer according to claim 18, characterized in that, When the snap-fit ​​portion contacts the first slot, the hot end device is fixed to the mounting slot in the arrangement direction of the heat sink and the heat conductor.

20. The three-dimensional printer according to claim 15, characterized in that, The heating base assembly also includes a connecting frame and a heat insulation component. One end of the heat insulation component contacts the heating base, and the other end of the heat insulation component contacts the connecting frame.

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