Extrusion assembly, print head and stereolithography printer

Abstract

The application relates to an extrusion assembly, a printing head and a stereoscopic printer, and relates to an extrusion assembly for a stereoscopic printer, which comprises: a conveying wheel set, the conveying wheel set comprising a first conveying wheel and a second conveying wheel which are arranged at intervals in a first direction; and a guide member, the guide member comprising a protruding part extending between the first conveying wheel and the second conveying wheel, the protruding part comprising a first surface facing the first conveying wheel and a second surface facing the second conveying wheel, the protruding part being provided with a first guide hole with an extension direction being at an angle to the first direction, and the guide member further comprising at least one flange part protruding from the first surface and / or the second surface, the at least one flange part defining a second guide hole in communication with the first guide hole. The application can effectively guide the consumables, improve the stability of the consumable conveying, and improve the deformation and blockage problems of the consumables.

Description

Technical Field

[0001] This application relates to the field of stereoscopic printing, and in particular to an extrusion assembly, a print head, and a stereoscopic printer. Background Technology

[0002] A 3D printer (also known as a stereo printer or three-dimensional printer) is a rapid prototyping process. Currently, the most common 3D printing technology 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. Specifically, in an FDM 3D printer, a feeding mechanism provides molten filament material to the hot-end device. The molten filament 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, printing the three-dimensional object layer by layer.

[0003] In FDM printers, the extrusion assembly feeds the filament towards the nozzle. In related technologies, guide blocks are often provided in the extrusion assembly to better guide the filament. In developing this application, the inventors discovered at least the following problems in the known technology: serious issues such as filament deformation and clogging occur in the extrusion assembly. Utility Model Content

[0004] This application provides an extrusion assembly, a printhead, and a 3D printer, which can effectively guide consumables, improve the stability of consumable delivery, and alleviate consumable deformation and clogging problems.

[0005] In a first aspect, the extrusion assembly provided in the embodiments of this application is used in a stereo printer, the extrusion assembly comprising: The conveyor wheel assembly includes a first conveyor wheel and a second conveyor wheel spaced apart in a first direction; and A guide member includes an extension extending between the first conveyor wheel and the second conveyor wheel. The extension includes a first surface facing the first conveyor wheel and a second surface facing the second conveyor wheel. The extension has a first guide hole whose extending direction is at an angle to the first direction. The guide member also includes at least one flange protruding from the first surface and / or the second surface. The at least one flange defines a second guide hole communicating with the first guide hole.

[0006] In some embodiments, the guide member further includes a body portion fixedly connected to one end of the extension portion away from the conveyor wheel assembly, the body portion defining a third guide hole communicating with the first guide hole.

[0007] In some embodiments, the at least one flange portion includes a first flange portion and a second flange portion arranged along the first direction, the first flange portion being disposed on the first surface and the second flange portion being disposed on the second surface.

[0008] In some embodiments, the extension portion extends in a tapering manner from one end away from the conveyor wheel assembly toward one end closer to the conveyor wheel assembly; and / or, At least one of the first surface and the second surface comprises a curved surface.

[0009] In some embodiments, each of the flange portions includes a third surface for defining the second guide hole, and each of the flange portions also includes a first guide ramp connected to one end of the third surface near the conveyor wheel assembly.

[0010] In some embodiments, the first guide hole includes a guide hole section that extends in a tapering manner from one end near the conveyor wheel assembly to the end away from the conveyor wheel assembly.

[0011] In some embodiments, the first guide hole divides the end of the extension near the conveyor wheel assembly into a first tip and a second tip, and each of the flanges connects the end of the first tip and the second tip away from the conveyor wheel assembly.

[0012] In some embodiments, the extrusion assembly further includes: The housing has the conveyor wheel assembly rotatably mounted on it, and the housing has a insertion slot on it, where the guide member is installed.

[0013] Secondly, the printhead provided in this application embodiment is used in a stereo printer, the printhead comprising: Mounting rack; The extrusion assembly provided in any of the above embodiments is mounted on one end of the mounting bracket; and A nozzle is mounted on the other end of the mounting bracket.

[0014] Thirdly, the stereo printer provided in the embodiments of this application includes: Molding platform; and The print head provided in any of the above embodiments is movable relative to the forming platform.

[0015] One of the above technical solutions has the following advantages or beneficial effects: In the extrusion assembly, printhead, and 3D printer, the extension portion of the guide member extends between the first and second conveying wheels, and the extension portion is provided with a first guide hole for guiding consumables. At the same time, the flange portion defines a second guide hole that communicates with the first guide hole. The second guide hole can guide the consumables into the first guide hole, reducing the occurrence of burrs and edge jamming on the surface of the consumables, thereby effectively guiding the consumables, improving the stability of consumable delivery, and improving the problems of consumable deformation and blockage. Attached Figure Description

[0016] Figure 1 This is a partial front view of the extrusion component according to an embodiment of this application.

[0017] Figure 2 for Figure 1 The rear view after removing the housing.

[0018] Figure 3 for Figure 2 The left view.

[0019] Figure 4 for Figure 3 AA sectional view.

[0020] Figure 5 for Figure 4 Enlarged view of the central guide component structure.

[0021] Figure 6 This is a schematic diagram of the guide member structure in the extrusion assembly of this application embodiment.

[0022] Figure 7 This is a front view of the guide member in the extrusion assembly of an embodiment of this application.

[0023] Figure 8 for Figure 7 Top view.

[0024] Figure 9 for Figure 1 An exploded view of the structure shown from another perspective.

[0025] Figure 10 This is a schematic diagram of the three-dimensional structure of the printhead in an embodiment of this application.

[0026] Figure 11 for Figure 10 An exploded view of the printhead from another perspective.

[0027] Figure 12 This is a schematic diagram of the structure of a 3D printer according to an embodiment of this application.

[0028] Wherein: 1000 - 3D printer (100 - print head (10 - extrusion assembly (11 - conveyor wheel assembly (111 - first conveyor wheel, 112 - second conveyor wheel), 12 - guide member (121 - extension part (1211 - first surface, 1212 - second surface, 1213 - first guide hole (12131 - guide hole section, 12132 - cylindrical hole section), 1214 - first tip, 1215 - second tip), 122 - flange part (122a - first flange) 122b-Second flange portion, 1221-Second guide hole, 1222-Third surface, 1223-First guide slope), 123-Body portion (1231-Third guide hole), 124-Limiting portion), 13-Housing (131-Insertion groove (1311-First groove segment, 1312-Second groove segment), 132-First mounting cavity, 133-Second mounting cavity, 134-Fourth guide hole)), 20-Mounting bracket, 30-Nozzle), 200-Forming platform). Detailed Implementation

[0029] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0030] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to 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.

[0031] 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 to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0032] Please refer to Figures 1 to 12In this embodiment, the extrusion assembly 10 is used in a 3D printer 1000. The extrusion assembly 10 includes a conveyor roller assembly 11 and a guide member 12. The conveyor roller assembly 11 includes a first conveyor roller 111 and a second conveyor roller 112, which are spaced apart in a first direction. The guide member 12 includes an extension portion 121 that extends between the first conveyor roller 111 and the second conveyor roller 112. The extension portion 121 includes a first surface 1211 and a second surface 1212. The first surface 1211 faces the first conveyor roller 111, and the second surface 1212 faces the second conveyor roller 112. The extension portion 121 has a first guide hole 1213, and the extension direction of the first guide hole 1213 is at an angle to the first direction. The guide member 12 further includes at least one flange portion 122, which protrudes from the first surface 1211 and / or the second surface 1212. The at least one flange portion 122 defines a second guide hole 1221, which communicates with the first guide hole 1213.

[0033] In this embodiment, the extension portion 121 of the guide member 12 extends between the first conveying wheel 111 and the second conveying wheel 112, and the extension portion 121 is provided with a first guide hole 1213 for guiding consumables. At the same time, the flange portion 122 defines a second guide hole 1221 that communicates with the first guide hole 1213, further extending the guiding path of consumables. The second guide hole can guide consumables into the first guide hole, reducing the occurrence of burrs and edge jamming on the surface of consumables, thereby effectively guiding consumables, improving the stability of consumable conveying, and improving the problems of consumable deformation and blockage.

[0034] As an example, the extension direction of the first guide hole 1213 is a second direction, which can be perpendicular to the first direction. Understandably, the first direction can be a horizontal direction, and the second direction can be a vertical direction. Understandably, the flange portion 122 can be integrally formed with the extension portion 121.

[0035] In some implementation methods, please refer to Figures 2 to 8 The guide member 12 also includes a body portion 123, which is fixedly connected to the end of the extension portion 121 away from the conveyor wheel assembly 11. The body portion 123 defines a third guide hole 1231, which communicates with the first guide hole 1213.

[0036] In this embodiment, the end of the extension 121 furthest from the conveyor wheel assembly 11 is fixedly connected to the body portion 123. The body portion 123 provides stable structural support for the extension 121, preventing deformation of the extension 121 due to lack of support and resulting in guide deviation. Furthermore, the body portion 123 defines a third guide hole 1231 communicating with the first guide hole 1213, further extending the guide path for the consumables and thus further improving the stability of consumable delivery. Understandably, the body portion 123 can be integrally formed with the extension 121.

[0037] In some implementation methods, please refer to Figures 4 to 8 At least one flange portion 122 includes a first flange portion 122a and a second flange portion 122b, which are arranged along a first direction. The first flange portion 122a is disposed on a first surface 1211, and the second flange portion 122b is disposed on a second surface 1212. In this embodiment, the first flange portion 122a and the second flange portion 122b can form a guiding constraint on the consumable between the first conveying wheel 111 and the second conveying wheel 112, preventing the consumable from shifting to either the first conveying wheel 111 or the second conveying wheel 112.

[0038] As one implementation method, please refer to Figures 4 to 8 The first flange portion 122a and the second flange portion 122b are symmetrically arranged about the axis of the first guide hole 1213, thereby forming a symmetrical guiding constraint on the consumable between the first conveying wheel 111 and the second conveying wheel 112, further improving the symmetry and stability of the guide.

[0039] In some implementation methods, please refer to Figure 2 ,as well as Figures 4 to 8 The extension portion 121 extends in a tapering manner from the end furthest from the conveyor wheel assembly 11 toward the end closest to the conveyor wheel assembly 11. In other words, the width of the extension portion 121 in the first direction gradually decreases from the side furthest from the conveyor wheel assembly 11 toward the side closest to the conveyor wheel assembly 11. This tapering extension makes the end of the extension portion 121 narrower near the conveyor wheel assembly 11, allowing it to more smoothly extend into the gap between the first conveyor wheel 111 and the second conveyor wheel 112. It also avoids contact or interference with the rotating conveyor wheel assembly 11, ensuring the normal operation of the conveyor wheel assembly 11.

[0040] In some implementation methods, please refer to Figure 2 as well as Figures 4 to 8At least one of the first surface 1211 and the second surface 1212 includes a curved surface, which can better adapt to the outer contour of the conveyor wheel assembly 11, so that the curved surface can fit the outer contour of the conveyor wheel assembly 11, and ensure that the distance between the first surface 1211 and the first conveyor wheel 111 and / or the distance between the second surface 1212 and the second conveyor wheel 112 is as uniform as possible. This avoids the problem of excessively large or small local distances between the plane and the conveyor wheel assembly 11, thereby reducing the force shift and extrusion deformation caused by uneven spacing during consumable conveying, and reducing the risk of interference between the conveyor wheel assembly 11 and the extension part 121 when rotating, ensuring stable consumable conveying. As an example, the first surface 1211 and the second surface 1212 include curved surfaces, and the first surface 1211 and the second surface 1212 are symmetrically arranged in a first direction.

[0041] As one implementation method, please refer to Figure 4 The first surface 1211 faces the first conveyor wheel 111 and is spaced apart from it. The first surface 1211 is an arc surface coaxial with the first conveyor wheel 111. The second surface 1212 faces the second conveyor wheel 112 and is spaced apart from it. The second surface 1212 is also an arc surface coaxial with the second conveyor wheel 112. In this embodiment, the first surface 1211 and the second surface 1212 are adapted to the outer contours of the first conveyor wheel 111 and the second conveyor wheel 112, respectively, to avoid problems such as excessively small local spacing (causing interference) or excessively large spacing (failing to provide auxiliary constraint) due to mismatched surface shapes. At the same time, the spaced arrangement of the guide member 12 with the conveyor wheel assembly 11 ensures that the conveyor wheel assembly 11 will not come into contact with or rub against the first surface 1211 and the second surface 1212 when it rotates, thus ensuring the normal operation of the conveyor wheel assembly 11.

[0042] In some implementation methods, please refer to Figure 5 Each flange portion 122 includes a third surface 1222, which defines a second guide hole 1221. Each flange portion 122 also includes a first guide ramp 1223, which is connected to the end of the third surface 1222 near the conveyor wheel assembly 11. The first guide ramp 1223 can guide the consumable into the second guide hole 1221 defined by the third surface 1222, avoiding jamming caused by edge obstruction when the consumable enters the second guide hole 1221, and further improving the smoothness of conveying.

[0043] In some implementation methods, please refer to Figure 6 and Figure 8The first guide hole 1213 includes a guide hole section 12131, which extends in a tapering manner from the end near the conveyor wheel assembly 11 to the end away from the conveyor wheel assembly 11. That is, the diameter of the guide hole section 12131 gradually decreases from the side near the conveyor wheel assembly 11 to the side away from the conveyor wheel assembly 11, which can form a progressive tightening guide for the consumables. This facilitates the smooth entry of the consumables from the conveyor wheel assembly 11 into the first guide hole 1213, and the gradually decreasing diameter ensures stable conveying of the consumables in subsequent conveying, reducing shaking and deviation, and improving guiding stability. At the same time, the frustum-shaped guide hole section 12131 makes it easier for debris carried on the surface of the consumables to slide off along the inclined hole wall in the direction of consumable conveying, avoiding the accumulation of debris at the entrance of the guide hole section 12131. Even if the consumables are slightly deformed, the gradual space of the frustum can also provide a buffer for the consumables, reducing the situation of debris retention due to jamming, thereby reducing the risk of material blockage and ensuring smooth conveying.

[0044] As an example, please refer to Figure 8 The wall of the guide hole section 12131 can be part of the first frustum surface, and the diameter of the first frustum surface gradually decreases from the side closer to the conveyor wheel set 11 to the side farther away from the wheel set.

[0045] As one implementation method, please refer to Figure 5 and Figure 6 The first guide hole 1213 also includes a cylindrical hole section 12132, which is connected to the guide hole section 12131. The cylindrical hole section 12132 is located on the side of the guide hole section 12131 away from the conveyor wheel set 11. That is to say, the consumables output by the conveyor wheel set 11 enter the cylindrical hole section 12132 through the guide hole section 12131.

[0046] In this embodiment, the diameter of the guide hole section 12131 can perform preliminary calibration on the consumable that has just left the conveyor wheel assembly 11, guiding the consumable into the cylindrical hole section 12132. The diameter of the cylindrical hole section 12132 remains constant, which can form a continuous and stable constraint on the consumable after preliminary calibration, preventing the consumable from shaking or shifting again during subsequent conveying, and ensuring that the consumable is conveyed along the preset path.

[0047] As an example, please refer to Figure 5The cylindrical hole section 12132 connects the guide hole section 12131 and the third guide hole 1231. The cylindrical hole section 12132 and the third guide hole 1231 are coaxially arranged and have the same diameter. That is to say, the hole wall of the cylindrical hole section 12132 and the hole wall of the third guide hole 1231 are located on the same cylindrical surface (first cylindrical surface). This allows the consumables to achieve a smooth transition without steps or offset when they enter the third guide hole 1231 from the guide hole section 12131 through the cylindrical hole section 12132. This avoids the consumables getting stuck due to the size or axis deviation at the hole section connection, and further ensures the smoothness and stability of the delivery.

[0048] In some examples, please refer to Figure 5 and Figure 6 The wall of the second guide hole 1221, i.e. the third surface 1222, is located on the first cylindrical surface. In other words, the third surface 1222, the wall of the cylindrical hole section 12132, and the wall of the third guide hole 1231 are all located on the same cylindrical surface. This allows the consumables to be transported along the same cylindrical surface path as they pass through the second guide hole 1221, the cylindrical hole section 12132, and the third guide hole 1231 after entering the guide hole section 12131 from the conveying wheel set 11. This avoids the consumables from getting stuck or damaged by friction due to sudden changes in the path, and maximizes the smoothness of the transport.

[0049] In some implementation methods, please refer to Figure 6 and Figure 8 The first guide hole 1213 divides the end of the extension 121 near the conveyor wheel assembly 11 into a first tip 1214 and a second tip 1215, and each flange 122 connects the end of the first tip 1214 and the second tip 1215 away from the conveyor wheel assembly 11.

[0050] In this embodiment, the flange portion 122 can form a more complete guide structure at the entrance of the cylindrical hole section 12132, which can effectively increase the contact area between the consumable and the guide member 12 when the consumable enters the cylindrical hole section 12132, so that the consumable can transition more smoothly to the cylindrical hole section 12132 after being output from the conveying wheel group 11. This avoids the consumable getting stuck or the accumulation of fragments due to the gap formed by the separation of the first tip 1214 and the second tip 1215, thereby reducing the risk of material blockage and ensuring smooth conveying.

[0051] In some implementation methods, please refer to Figure 1 and Figure 9 The extrusion assembly 10 also includes a housing 13, on which a conveyor wheel set 11 is rotatably mounted, and a insertion groove 131 is provided on the housing 13, on which a guide member 12 is installed.

[0052] As one implementation method, please refer to Figure 1 and Figure 9The housing 13 has a first mounting cavity 132 and a second mounting cavity 133, which are connected. A insertion slot 131 is located between the first and second mounting cavities 132 and at one end of each cavity in a second direction. A first conveying wheel 111 is installed in the first mounting cavity 132, and a second conveying wheel 112 is installed in the second mounting cavity 133. The housing 13 also has a fourth guide hole 134, located between the first and second mounting cavities 132 and at the other end of each cavity in a second direction. The fourth guide hole 134 guides consumables into the space between the first and second conveying wheels 111 and 112.

[0053] In this embodiment, the first mounting cavity 132 and the second mounting cavity 133 are independent yet interconnected, providing a stable mounting space for the first conveying wheel 111 and the second conveying wheel 112. This ensures that the first conveying wheel 111 and the second conveying wheel 112 are accurately positioned and do not interfere with each other during rotation, providing a reliable power foundation for consumable delivery. The consumables sequentially pass through the fourth guide hole 134, the conveying wheel set 11, and the guide member 12 before entering the nozzle 30, reducing the risk of consumable jamming and further improving the stability and reliability of consumable delivery.

[0054] As one implementation method, please refer to Figure 9 The guide member 12 is inserted into the insertion slot 131 along a third direction, which is parallel to the axis of the conveyor wheel. As an example, the third direction is perpendicular to the first and second directions. This third direction can be a horizontal front-to-back direction.

[0055] As one implementation method, please refer to Figure 1 , Figures 2 to 7 as well as Figure 9 The guide member 12 also includes a limiting part 124, which is formed at the end of the body part 123 away from the extension part 121. The width of the limiting part 124 in the first direction is greater than the width of the body part 123 in the first direction. The insertion groove 131 includes a first groove segment 1311 and a second groove segment 1312 that are connected. The body part 123 is restricted in the first groove segment 1311 and the limiting part 124 is restricted in the second groove segment 1312. This can achieve precise positioning of the guide member 12 in the housing 13 and prevent the guide member 12 from moving relative to the housing 13 in the second direction.

[0056] Please refer to Figures 10 to 12 In this application embodiment, the printhead 100 is used in a 3D printer 1000. The printhead 100 includes a mounting frame 20, a nozzle 30, and an extrusion assembly 10 provided in any of the above embodiments. The extrusion assembly 10 is mounted on one end of the mounting frame 20, and the nozzle 30 is mounted on the other end of the mounting frame 20.

[0057] Optionally, the mounting frame 20 may include a substrate and a front shell, the substrate being slidably connected to the optical axis of the 3D printer, the front shell being connected to the substrate, and the extrusion assembly 10 and the nozzle 30 being mounted between the front shell and the substrate. The extrusion assembly 10 and the nozzle 30 may move synchronously with the mounting frame 20.

[0058] The consumables can be linear polymer materials, also known as filaments. Examples of consumables 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.

[0059] The consumables can be wound on a tray, and the consumables are conveyed to the extrusion assembly 10 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 consumables wound on different trays can be the same or different.

[0060] In other embodiments, the printhead may not include an extrusion assembly. In this case, the extrusion assembly may be arranged distally, for example, fixedly mounted to the frame, fixed to the end of the optical axis, or fixed to the cartridge.

[0061] Please refer to Figure 12 The 3D printer 1000 of this application embodiment includes a forming platform 200 and a print head 100 provided in any of the above embodiments, and the print head 100 and the forming platform 200 are movable relative to each other.

[0062] The 3D printer 1000 may also include displacement components in three directions: X, Y, and Z (not shown in the figure). The X direction can be a horizontal direction, the Y direction can be a horizontal forward or backward direction, and the Z direction can be a vertical or up-down direction.

[0063] The print head and forming platform move relative to each other in a controlled manner, driven by displacement components. For example, the forming platform can be displaced relative to the 3D printer frame along the Y direction by a displacement component along the Y direction, while the print head can be displaced along the X and / or Z directions by displacement components along the X and Z directions, heating and melting the filament along a set path, and printing it onto the forming platform to form a printed part. The X, Y, and Z displacement components can be driven by lead screws and nuts, belts, or other mechanisms, and are not limited here.

[0064] In this embodiment, optionally, the 3D printer may further include a frame (not shown in the figure), the frame including a base and a gantry, the gantry being connected to the base. A forming platform is movably disposed on the base along the Y-axis. The gantry includes two columns spaced apart along the X-axis and a crossbeam connecting the ends of the two columns away from the base, wherein the columns extend along the Z-axis. The crossbeam and columns may be integrally formed or a separate structure connected by bolts or other connecting components. An optical axis movable along the Z-axis is connected between the two columns, and the print head is movably disposed on the optical axis along the X-axis. Thus, the print head can be displaced along the X-axis on the optical axis, and / or, displaced along the Z-axis together with the optical axis.

[0065] In other embodiments, the rack may also take other forms of structure, which are not limited here.

[0066] In other embodiments, the movement of the printhead and the forming platform can also take other forms. For example, the forming platform may remain stationary, while the printhead may be displaced relative to the forming platform along the X, Y, and Z directions, respectively. Alternatively, the forming platform may be displaced along the X and Y directions, and the printhead may be displaced along the Z direction.

[0067] In some embodiments, the 3D printer may further include a housing that defines a receiving cavity in which the print head and forming platform are both disposed. The housing separates the internal and external spaces of the 3D printer, ensuring a stable printing environment. The housing may have a door that can be opened or closed to facilitate the removal of the printed parts.

[0068] The printhead body is movable relative to the forming platform. For example, the printhead body is slidably disposed along the optical axis in the X direction, so that the printhead body can move along the X direction relative to the optical axis in the X direction, or move along the Z direction with the optical axis. The forming platform is slidably disposed along the Y direction. Thus, the printhead body and the forming platform can move relative to each other.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above embodiments merely illustrate preferred implementations of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. An extrusion assembly for use in a 3D printer, characterized in that, The extrusion assembly includes: The conveyor wheel assembly includes a first conveyor wheel and a second conveyor wheel spaced apart in a first direction; and A guide member includes an extension extending between the first conveyor wheel and the second conveyor wheel. The extension includes a first surface facing the first conveyor wheel and a second surface facing the second conveyor wheel. The extension has a first guide hole whose extending direction is at an angle to the first direction. The guide member also includes at least one flange protruding from the first surface and / or the second surface. The at least one flange defines a second guide hole communicating with the first guide hole.

2. The extrusion assembly as claimed in claim 1, characterized in that, The guide member further includes a body portion, which is fixedly connected to one end of the extension portion away from the conveyor wheel assembly, and the body portion defines a third guide hole that communicates with the first guide hole.

3. The extrusion assembly as described in claim 1, characterized in that, The at least one flange portion includes a first flange portion and a second flange portion arranged along the first direction, the first flange portion being disposed on the first surface and the second flange portion being disposed on the second surface.

4. The extrusion assembly as claimed in claim 1, characterized in that, The insertion portion extends in a tapering manner from one end away from the conveyor wheel assembly to one end closer to the conveyor wheel assembly; and / or, At least one of the first surface and the second surface comprises a curved surface.

5. The extrusion assembly as claimed in claim 1, characterized in that, Each of the flanges includes a third surface for defining the second guide hole, and each of the flanges also includes a first guide ramp connected to one end of the third surface near the conveyor wheel assembly.

6. The extrusion assembly as claimed in claim 1, characterized in that, The first guide hole includes a guide hole section that extends in a tapering manner from one end near the conveyor wheel assembly to the end away from the conveyor wheel assembly.

7. The extrusion assembly as claimed in claim 1, characterized in that, The first guide hole divides the end of the extension near the conveyor wheel assembly into a first tip and a second tip, and each of the flanges connects the end of the first tip and the second tip away from the conveyor wheel assembly.

8. The extrusion assembly as claimed in claim 1, characterized in that, Also includes: The housing has the conveyor wheel assembly rotatably mounted on it, and the housing has a insertion slot on it, where the guide member is installed.

9. A printhead for use in a 3D printer, characterized in that, The printhead includes: Mounting rack; The extrusion assembly as claimed in any one of claims 1 to 8, wherein the extrusion assembly is mounted at one end of the mounting bracket; and A nozzle is mounted on the other end of the mounting bracket.

10. A 3D printer, characterized in that, include: Molding platform; as well as The print head as described in claim 9 is movable relative to the forming platform.

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