Extrusion device and three-dimensional printer

Abstract

The invention relates to an extrusion device and a three-dimensional printer. The extrusion device comprises a driving assembly; the feeding assembly comprises a rotating seat coaxially connected with the driving assembly and a plurality of extrusion rods used for clamping wires in a matched mode, and the multiple extrusion rods are rotationally connected to the rotating seat and arranged around the axis of the rotating seat; and the driving assembly is used for driving the feeding assembly to rotate, so that the extrusion rods clamping the wire rod jointly push the wire rod to move in the axis direction of the rotating seat. The printing precision can be improved, and meanwhile sufficient feeding can be guaranteed.

Description

Technical Field

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

[0002] In a 3D printer, the extrusion unit holds the filament and conveys it along the conveying direction to the nozzle unit. The nozzle unit melts the filament and deposits it layer by layer onto the printing platform to form a 3D model.

[0003] In related technologies, extrusion devices often suffer from insufficient clamping stability, limited pushing capacity, and poor transmission efficiency, making it difficult to achieve both high-precision printing and high-flow output at the same time. Summary of the Invention

[0004] This application provides an extrusion device and a 3D printer that can improve printing accuracy while ensuring sufficient material supply.

[0005] In a first aspect, the extrusion apparatus provided in the embodiments of this application is used for a stereo printer, comprising: Driver components; and The feeding assembly includes a rotating base coaxially connected to the drive assembly and a plurality of extrusion rods for clamping the wire. The plurality of extrusion rods are rotatably connected to the rotating base and arranged around the axis of the rotating base. The drive assembly is used to drive the feeding assembly to rotate, so that the extrusion rods holding the wire together push the wire to move along the axial direction of the rotating seat.

[0006] In some embodiments, the rotary seat includes a first connector coaxially connected to the output shaft of the drive assembly and a plurality of second connectors arranged around the axis of the first connector. The plurality of second connectors correspond one-to-one with a plurality of extrusion rods, and the extrusion rods are connected to the corresponding second connectors. The second connectors are movably connected to the first connectors, and the second connectors are capable of driving the extrusion rods to a first position for clamping the wire and a second position for releasing the wire.

[0007] In some embodiments, the second connector is hinged or slidably connected to the first connector, and the rotating seat further includes an elastic element for pushing the second connector to cause the extrusion rod to clamp the wire.

[0008] In some embodiments, the second connector includes a first connecting arm connected at one end to the extrusion rod and a second connecting arm connected at the other end of the first connecting arm; the two ends of the elastic member abut against the first connecting arm and the first connector, respectively; when the elastic member pushes the free end of the first connecting arm closer to the axis of the rotating seat, the second connecting arm protrudes from the outer periphery of the first connector; and / or, The elastic element is a spring.

[0009] In some embodiments, the rotary seat further includes a plurality of mounting blocks connecting the second connector to the extrusion rod, wherein each of the plurality of mounting blocks corresponds one-to-one with a plurality of the second connectors.

[0010] In some embodiments, the output shaft of the drive assembly has a first conveying hole in the middle for conveying the wire; the rotating seat has a second conveying hole in the middle for conveying the wire.

[0011] In some embodiments, the extrusion rod is rotatably connected to the rotary seat; and / or, the extrusion rod is a worm gear or a screw; or, The extrusion rod includes a support rod connected to the rotating seat and a screw sleeve rotatably fitted onto the support rod.

[0012] In some embodiments, the axis of the extrusion rod is inclined relative to the axis of the rotating seat, and the angle between the axis of each extrusion rod and the axis of the rotating seat is the same.

[0013] Secondly, the stereo printer provided in the embodiments of this application includes: Nozzle device; and The extrusion apparatus provided in any of the above embodiments is used to extrude the wire into the nozzle device.

[0014] In some embodiments, the 3D printer further includes a support and a force sensor for detecting the extrusion force of the feeding assembly, the force sensor being mounted on the support, and the drive assembly and / or the nozzle device being connected to the support via the force sensor.

[0015] Compared with the prior art, the beneficial effects of the embodiments of this application are as follows: the extrusion device and 3D printer drive the rotating seat coaxially connected to the drive component to rotate, so that multiple extrusion rods connected to the rotating seat rotate synchronously. Thus, when the multiple extrusion rods rotate, they jointly clamp and push the filament to move along the axial direction of the rotating seat, increasing the clamping contact area of ​​the filament, thereby improving the pushing force and the uniformity of force distribution, effectively preventing the filament from slipping or deviating during the pushing process. At the same time, the drive component and the rotating seat are directly coaxially connected, which can also reduce the energy loss and response delay of multi-stage transmission, thereby improving printing accuracy while ensuring sufficient and continuous material supply. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the extrusion device structure in Embodiment 1 of this application.

[0017] Figure 2 for Figure 1 AA sectional view.

[0018] Figure 3 for Figure 1 BB cross-sectional view.

[0019] Figure 4 for Figure 1 Top view.

[0020] Figure 5 for Figure 4 CC section view.

[0021] Figure 6 for Figure 1 The diagram shows a three-dimensional structure of the extrusion device.

[0022] Figure 7 for Figure 6 Exploded view.

[0023] Figure 8 for Figure 6 An exploded view of the second transition section in the extrusion device shown.

[0024] Figure 9 This is a schematic diagram of the second connecting member in the extrusion device of Embodiment 1 of this application.

[0025] Figure 10 This is a schematic diagram of the structure of the 3D printer according to Embodiment 2 of this application.

[0026] Figure 11 This is a partial structural diagram of the 3D printer according to Embodiment 2 of this application.

[0027] Wherein: 100-3D printer (10-extrusion device (11-drive assembly (111-output shaft, 112-first conveying hole), 12-feeding assembly (121-rotating seat (1211-first connector (12111-receiving cavity, 12112-rotating shaft hole, 12113-first surface, 12114-first adapter, 12115-second adapter (121151-transfer block, 121152-cut-out area), 12116-conveyor), 1212-second Connectors (12121-first connecting arm, 12122-second connecting arm, 12123-rotating shaft, 12124-limiting post), 1213-elastic element, 1214-mounting block, 1215-second conveying hole), 122-extrusion rod (1221-support rod, 1222-screw sleeve, 1223-bearing)), 13-fastener), 20-nozzle device, 30-bracket, 40-force sensor (41-first force sensor, 42-second force sensor)), 200-wire. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Please refer to Figures 1 to 11In this embodiment, the extrusion device 10 is used in a 3D printer 100. The extrusion device 10 includes a drive assembly 11 and a feeding assembly 12. The feeding assembly 12 includes a rotating base 121 and a plurality of extrusion rods 122. The rotating base 121 is coaxially connected to the drive assembly 11. The plurality of extrusion rods 122 are used to cooperate in clamping the filament 200. The plurality of extrusion rods 122 are rotatably connected to the rotating base 121, and the plurality of extrusion rods 122 are arranged around the axis of the rotating base 121. The drive assembly 11 is used to drive the feeding assembly 12 to rotate, so that the extrusion rods 122 clamping the filament 200 jointly push the filament 200 to move along the axial direction of the rotating base 121.

[0032] In the extrusion device 10 of this application embodiment, the drive assembly 11 drives the rotating seat 121, which is coaxially connected to the drive assembly 11, to rotate. This causes multiple extrusion rods 122 connected to the rotating seat 121 to rotate synchronously. As the multiple extrusion rods 122 rotate, they jointly clamp and push the wire 200 to move along the axial direction of the rotating seat 121, increasing the clamping contact area of ​​the wire 200. This improves the pushing force and the uniformity of force distribution, effectively preventing the wire 200 from slipping or deviating during the pushing process. At the same time, the drive assembly 11 is directly coaxially connected to the rotating seat 121, eliminating the need for intermediate transmission structures such as transmission gears. This reduces the overall size and weight of the extrusion device 10, making it more compact and lightweight. Furthermore, the direct drive can avoid energy loss and response delay caused by multi-stage transmission, thereby improving printing accuracy while ensuring sufficient and continuous material supply.

[0033] In some implementation methods, please refer to Figure 2 and Figure 7The rotating base 121 includes a first connecting member 1211 and a second connecting member 1212. The first connecting member 1211 is coaxially connected to the output shaft 111 of the drive assembly 11. Multiple second connecting members 1212 are arranged around the axis of the first connecting member 1211. The number of second connecting members 1212 is the same as the number of extrusion rods 122. Each second connecting member 1212 corresponds one-to-one with a single extrusion rod 122, and each extrusion rod 122 is connected to its corresponding second connecting member 1212. The second connecting member 1212 is movably connected to the first connecting member 1211. When the second connecting member 1212 moves relative to the first connecting member 1211, it can drive the corresponding extrusion rod 122 to move to a first position and a second position. It should be noted that one or more first connecting members 1211 may be movable, allowing one or more extrusion rods 122 to move to a first position and a second position. The extrusion rod 122 may switch between the first and second positions by swinging or translating. The first position refers to the position where the extrusion rod 122 is close to the wire axis, and the second position refers to the position where the extrusion rod 122 is away from the wire axis. Optionally, each extrusion rod 122 may be movable to both the first and second positions. This helps to reduce the stroke of a single extrusion rod 122.

[0034] In this embodiment, the rotating seat 121 is divided into a first connecting member 1211, which is coaxially fixed with the drive assembly 11, and multiple second connecting members 1212 that can move independently. This ensures that the drive assembly 11, which provides power, maintains a stable coaxial connection with the first connecting member 1211. At the same time, each second connecting member 1212 can drive the corresponding extrusion rod 122 to move independently to adjust the position of the extrusion rod 122. This not only ensures that the multiple extrusion rods 122 can rotate synchronously around the axis of the first connecting member 1211 to maintain a uniform clamping force when clamping the wire 200, thus guaranteeing stable clamping and effective pushing of the wire 200, but also makes it suitable for clamping wires 200 of different diameters. Moreover, when it is necessary to replace the wire 200 or perform maintenance, the position of one or more of the second connecting members 1212 can be adjusted to a second position according to the actual situation. This facilitates quick and flexible release of the wire 200 when changing materials or handling abnormalities, improving the reliability, applicability, and flexibility of the extrusion device 10.

[0035] In one implementation, the extrusion rod 122 can move relative to the first connector 1211 along the axis close to the rotating seat 121 to a first position for clamping the wire 200, and the extrusion rod 122 can also move relative to the first connector 1211 along the axis away from the rotating seat 121 to a second position for releasing the wire 200. When the multiple extrusion rods 122 are in the first position, the multiple extrusion rods 122 cooperate to clamp the wire 200. At this time, the drive assembly 11 can not only drive the feeding assembly 12 to rotate around the axis of the rotating seat 121, so that the multiple extrusion rods 122 clamping the wire 200 jointly push the wire 200 along the axis of the rotating seat 121 in a direction away from the rotating seat 121 (i.e., in a direction close to the nozzle device 20), realizing the normal conveying of the wire 200, the drive assembly 11 can also drive the feeding assembly 12 to rotate in the opposite direction, so that the multiple extrusion rods 122 jointly push the wire 200 along the axis of the rotating seat 121 in a direction close to the rotating seat 121 (i.e., in a direction away from the nozzle device 20), thereby realizing the unloading of the material. When the extrusion rod 122 is in the second position, an appropriate gap is maintained between the extrusion rod 122 and the wire 200, which facilitates the user to perform material replacement operations or handle abnormal situations of the wire 200, thereby improving the ease of operation of the extrusion device 10.

[0036] As one implementation method, please refer to Figure 2 , Figure 3 and Figure 7The rotating base 121 also includes multiple elastic elements 1213, the number of which is the same as the number of second connecting elements 1212. Each elastic element 1213 corresponds to one of the second connecting elements 1212. The elastic element 1213 pushes the corresponding second connecting element 1212, thereby keeping the extrusion rod 122 connected to the second connecting element 1212 clamping the wire 200. When the wire 200 enters the area between the rotating base 121 and the extrusion rod 122, the elastic force generated by the elastic element 1213 is transmitted to the extrusion rod 122 through the second connecting element 1212, causing the multiple extrusion rods 122 to work together to clamp the wire 200. When the multiple extrusion rods 122 work together to clamp the wire 200, the drive assembly 11 drives the rotating base 121 to rotate. The clamped wire 200 is pushed by the multiple extrusion rods 122, thereby being extruded or retracted along the axial direction of the rotating base 121. When the wire 200 needs to be released, external force is used to overcome the elastic force of the elastic element 1213 and gradually compress the elastic element 1213. This causes the second connector 1212 to move the extrusion rod 122 to a second position away from the axis of the rotating seat 121, thereby releasing the wire 200 from its clamping position and facilitating speed change of the wire 200. After the external force is removed, the elastic element 1213 pushes the second connector 1212 to reset, which in turn pushes the corresponding extrusion rod 122 back to the first position. This allows multiple extrusion rods 122 to work together again to clamp the wire 200. This allows for rapid recovery of the clamping state without additional manual adjustment or complex control mechanisms, simplifying the operation process and ensuring that the extrusion rod 122 can quickly re-clamp the wire 200 after each material change or maintenance. This, in turn, ensures the continuity of wire 200 feeding and printing accuracy. In addition, the elastic element 1213 also allows the extrusion rod 122 to adaptively adjust its relative position with the axis of the rotating seat 121 according to the diameter of the wire 200, so that multiple extrusion rods 122 can cooperate to stably clamp wires 200 of different diameters, thereby improving the compatibility of the extrusion device 10 with the specifications of the wire 200 and the clamping reliability.

[0037] In some implementation methods, please refer to Figure 5 The second connector 1212 can be hinged to the first connector 1211. The second connector 1212 can swing around the hinge point with the first connector 1211, causing the extrusion rod 122 connected to the second connector 1212 to swing in a direction close to or away from the axis of the rotating seat 121, so that the extrusion rod 122 can switch between the first position and the second position.

[0038] As one implementation method, please refer to Figure 2 , Figure 7 and Figure 9The second connector 1212 includes a first connecting arm 12121 and a second connecting arm 12122. The first end of the first connecting arm 12121 is connected to the extrusion rod 122, and the second end of the first connecting arm 12121 is connected to the first end of the second connecting arm 12122. The first end of the elastic member 1213 abuts against the first connecting arm 12121, and the second end of the elastic member 1213 abuts against the first connector 1211. The elastic member 1213 can apply a thrust to the first connecting arm 12121 in the direction of the axis of the rotating seat 121, so that the first connecting arm 12121 drives the extrusion rod 122 to swing to a first position in the direction of the axis of the rotating seat 121, thereby enabling the corresponding extrusion rod 122 to cooperate with the other extrusion rods 122 to clamp the wire 200. During the process of the extrusion rod 122 swinging from the second position to the first position, the second end of the second connecting arm 12122 always remains exposed on the outer periphery of the first connecting member 1211, facilitating the application of external force to the second end of the second connecting arm 12122 by environmental components or the user. When it is necessary to release the wire 200, the environmental components or the user apply external force to the second end of the second connecting arm 12122. The external force overcomes the thrust of the elastic member 1213, causing the first end of the first connecting arm 12121 to swing away from the axis of the rotating seat 121, which in turn drives the extrusion rod 122 to swing away from the axis of the rotating seat 121 to the second position. This simplifies the operation process, allowing the wire 200 to be released quickly without disassembling the extrusion device 10. Moreover, the first connecting arm 12121 and the second connecting arm 12122 convert the thrust of the elastic member 1213 into the swing of the extrusion rod 122 through the lever principle, improving the transmission efficiency of the clamping force and ensuring the uniform distribution of the clamping force when multiple extrusion rods 122 work together, thereby improving the stability and ease of operation of clamping the wire 200.

[0039] As an example, please refer to Figure 9 The second connector 1212 is an integrally molded structure, which not only simplifies the assembly process and reduces production costs, but also improves the strength of the second connector 1212. This allows the second connector 1212 to effectively transfer the elastic force of the elastic element 1213 to the extrusion rod 122, avoiding stress concentration or transmission deviation caused by the split structure, thereby ensuring that the clamping force of the multiple extrusion rods 122 is evenly distributed when clamping the wire 200.

[0040] As one implementation method, please refer to Figure 3 and Figure 5The first connecting member 1211 includes a receiving cavity 12111, which is correspondingly disposed with and passes through the second connecting member 1212. A pivot hole 12112 is formed in the wall of the receiving cavity 12111. The second connecting member 1212 is at least partially received within the corresponding receiving cavity 12111. The second connecting member 1212 also includes a pivot 12123, which protrudes from the connection between the first connecting arm 12121 and the second connecting arm 12122. The pivot 12123 is rotatably connected within the pivot hole 12112, allowing the second connecting member 1212 to swing relative to the first connecting member 1211 about the axis of the pivot 12123. Furthermore, the second end of the second connecting arm 12122 protrudes outside the receiving cavity 12111.

[0041] In this embodiment, the second connector 1212 is at least partially housed within the receiving cavity 12111 of the first connector 1211. This not only improves the stability of the second connector 1212's swing and reduces its space occupation, but also protects the second connector 1212 from impurities affecting its rotational flexibility. Furthermore, the second end of the second connecting arm 12122 protrudes outside the receiving cavity 12111, providing a direct point of contact for environmental elements or users to apply external force to release the cable 200.

[0042] As an example, please refer to Figure 2 and Figure 3 The elastic element 1213 can be a spring. The first end of the elastic element 1213 abuts against the first connecting arm 12121, and the second end of the elastic element 1213 abuts against the cavity wall of the receiving cavity 12111. In some examples, the second connecting member 1212 further includes a limiting post 12124, which protrudes from the side of the first connecting arm 12121 away from the axis of rotation 12123. The first end of the elastic element 1213 is sleeved outside the limiting post 12124 and abuts against the side of the first connecting arm 12121 away from the axis of rotation 12123, thereby ensuring that the elastic force can be uniformly applied to the preset position of the first connecting arm 12121 in a predetermined direction, preventing the elastic element 1213 from shifting or bending.

[0043] As one implementation method, please refer to Figure 2The first connector 1211 includes a first surface 12113, which is correspondingly disposed with the second connector 1212. The first surface 12113 is located on the rotation path of the second connector 1212. When the extrusion rod 122 moves to the second position, the second connector 1212 and the first surface 12113 have a first gap, which will not interfere with the movement of the extrusion rod 122 to release the wire 200. When the extrusion rod 122 moves from the second position to the first position and just reaches the first position, the second connector 1212 abuts against the first surface 12113, or the second connector 1212 still has a second gap with the first surface 12113, and the second gap is smaller than the first gap. This prevents the extrusion rod 122 from swinging excessively in the first position due to the restriction of the first surface 12113, thus preventing damage to the surface of the wire 200 or deformation caused by excessive clamping force. Moreover, when the second connector 1212 abuts against the first surface 12113, there is still a gap between the extrusion rods 122. In other words, the first surface 12113 can also prevent the extrusion rods 122 from colliding with each other due to excessive swing amplitude, reduce mechanical wear and impact damage of the extrusion rods 122, and thus extend the service life of the extrusion rods 122.

[0044] It is understandable that the size of the second gap is related to the diameter of the wire 200. With other parameters being equal, the smaller the diameter of the wire 200, the smaller the second gap. When the diameter of the wire 200 is small (e.g., equal to the minimum diameter of the wire 200 that the 3D printer 100 is compatible with), the second connector 1212 can abut against the first surface 12113 when the extrusion rod 122 is in the first position. The second connector 1212 can also have a slight gap with the first surface 12113, which can be set according to the actual situation and will not be elaborated here.

[0045] As an example, please refer to Figure 2 The cavity wall of the receiving cavity 12111 includes a first surface 12113, which can be a horizontal plane or an inclined plane relative to the horizontal plane. When the extrusion rod 122 is in the second position, the second connecting arm 12122 is located above the first surface 12113, and the second connecting arm 12122 and the first surface 12113 have a first gap. When the extrusion wheel is in the first position, the second connecting arm 12122 is exactly abutting against the upper end of the first surface 12113, or the second connecting arm 12122 is located above the first surface 12113 and the second connecting arm 12122 and the first surface 12113 have a second gap, which is smaller than the first gap. In this embodiment, the first surface 12113 can not only serve as a limiting reference for the swing of the second connecting arm 12122, but also support the second connecting arm 12122.

[0046] It should be noted that in other embodiments, the second connector can be connected to the first connector in other ways. As an example, the second connector can be slidably connected to the first connector.

[0047] In some implementation methods, please refer to Figure 1 and Figure 2 ,as well as Figures 5 to 7 The rotating base 121 also includes a plurality of mounting blocks 1214, the number of which is the same as the number of extrusion rods 122. Each mounting block 1214 corresponds one-to-one with a plurality of second connectors 1212, and the mounting block 1214 is used to connect the second connector 1212 to the corresponding extrusion rod 122. As an example, one end of the mounting block 1214 is connected to the first end of the first connecting arm 12121, and the other end of the mounting block 1214 is connected to the extrusion rod 122.

[0048] In this embodiment, the extrusion rod 122 is indirectly connected to the second connector 1212 via the mounting block 1214, which solves the assembly difficulty problem caused by the small first end surface area of ​​the first connecting arm 12121. Moreover, since the extrusion rod 122 needs to repeatedly clamp and push the wire 200 during use, the contact point between the extrusion rod 122 and the wire 200 is prone to wear due to friction and compression. The indirect connection of the extrusion rod 122 to the second connector 1212 via the mounting block 1214 also avoids the risk of structural damage to the second connector 1212 caused by replacing the extrusion rod 122 when it is directly connected to the second connector 1212. This makes the disassembly and assembly of the extrusion rod 122 more convenient and does not require disassembly or replacement of the second connector 1212, reducing maintenance difficulty and component wear costs.

[0049] In some implementation methods, please refer to Figure 2 and Figure 7 The output shaft 111 of the drive assembly 11 has a first conveying hole 112 in the middle, which is used to convey the wire 200. The rotating seat 121 has a second conveying hole 1215 in the middle, which is used to convey the wire 200. The second conveying hole 1215 is connected to and coaxially arranged with the first conveying hole 112. The second conveying hole 1215 and the first conveying hole 112 together form a channel for conveying the wire 200, which avoids the wire 200 from being skewed or blocked, and ensures the smoothness of the wire 200 conveying and the accuracy of the path.

[0050] As an example, the drive component 11 is a motor.

[0051] As one implementation method, please refer to Figure 2 and Figure 7The first connector 1211 includes a first adapter 12114, a second adapter 12115, and a conveying part 12116. The first adapter 12114 is coaxially fixed to the outside of the output shaft 111, and the second adapter 12115 is coaxially fixed to the end of the first adapter 12114 away from the output shaft 111. The second adapter 12115 and the first adapter 12114 together define the receiving cavity 12111, thereby ensuring that the rotational torque output by the drive assembly 11 can be stably transmitted to the second connector 1212, avoiding transmission deviation, and providing a precise power reference for the subsequent conveying of the wire 200 and the rotation of the extrusion rod 122. The conveying section 12116 is coaxially arranged with the output shaft 111. One end of the conveying section 12116 is fixed between the output shaft 111 and the first adapter 12114 to ensure the concentricity of the conveying section 12116 and the output shaft 111. The other end of the conveying section 12116 passes through the mounting section and extends to near the extrusion rod 122. The conveying section 12116 defines the second conveying hole 1215.

[0052] As an example, please refer to Figure 1 and Figure 2 ,as well as Figures 5 to 7 The first adapter 12114 and the output shaft 111 are fixed by fasteners 13 such as screws.

[0053] As an example, please refer to Figure 2 and Figure 3 ,as well as Figures 5 to 8 The second adapter 12115 includes a plurality of adapter blocks 121151, which are arranged around the axis of the rotating base 121, and all adapter blocks 121151 have the same structure. The number of adapter blocks 121151 is the same as the number of second connectors 1212. Each adapter block 121151 is fixed to the first adapter 12114, and each adapter block 121151 has a hollowed-out area 121152 facing the adjacent adapter block 121151. The receiving cavity 12111 is defined by the hollowed-out areas 121152 of two adjacent adapter blocks 121151 and the side surface of the first adapter 12114 facing the second adapter 12115.

[0054] In this embodiment, the adjacent transition blocks 121151 and the first transition part 12114 are docked to form a receiving cavity 12111. This not only avoids the problems of difficult processing and precision control of integral structures, but also allows for quick loading and unloading of the second connector 1212, facilitating the rapid replacement of damaged parts during later maintenance.

[0055] In some embodiments, the extrusion rod 122 can rotate relative to the rotating seat 121 about its axis. For example, when the filament 200 is extruded or retracted, the extrusion rod 122 in contact with the filament 200 can rotate relative to the second connector 1212 about its axis. This allows the filament 200 to experience rolling friction rather than sliding friction with the extrusion rod 122 during transport, effectively preventing the filament 200 from being affected by frictional heating, scratches, or deformation, thus ensuring print quality. Furthermore, the rotating extrusion rod 122 can adapt to changes in the pushing direction and speed of the filament 200, preventing transport disruptions caused by filament twisting or jamming, improving the smoothness and stability of filament transport, and thereby ensuring print continuity and accuracy.

[0056] In some embodiments, the extrusion rod 122 is a worm gear, or it is a screw. That is, the outer circumferential surface of the extrusion rod 122 has a helical structure. When the extrusion rod 122 rotates about its own axis relative to the rotating seat 121, the contact between the helical structure and the wire 200 forms a continuous pushing or pulling force, which increases the axial driving force during the wire 200 conveying process and ensures that the wire 200 can be stably extruded or retracted.

[0057] In some implementation methods, please refer to Figure 1 and Figure 2 ,as well as Figures 5 to 7 The extrusion rod 122 includes a support rod 1221 and a screw sleeve 1222. The support rod 1221 is connected to the rotating seat 121, and the screw sleeve 1222 is rotatably fitted onto the support rod 1221. As an example, the support rod 1221 is fixed to the second connecting member 1212, and a bearing 1223 is provided between the screw sleeve 1222 and the support rod 1221. In this embodiment, when the surface of the screw sleeve 1222 wears due to friction from long-term extrusion or retraction of the wire 200, only the screw sleeve 1222 needs to be replaced, without needing to replace the entire extrusion rod 122, thus reducing maintenance costs.

[0058] In some implementation methods, please refer to Figure 1 and Figure 2 ,as well as Figures 5 to 7 The axis of the extrusion rod 122 is inclined relative to the axis of the rotating seat 121, and the angle between the axis of each extrusion rod 122 and the axis of the rotating seat 121 is the same. This ensures that the wire 200 is subjected to a uniform radial force when clamped, avoiding local stress concentration that could cause deformation of the wire 200 or unstable clamping. At the same time, the inclined extrusion rod 122 can extend the effective contact length with the wire 200 in a limited space, enhancing the wrapping and friction of the wire 200 and improving clamping reliability.

[0059] In some implementation methods, please refer to Figure 1 ,as well as Figures 5 to 7 The feeding assembly 12 includes at least three extrusion rods 122, thereby achieving stable wrapping and propulsion of the wire 200. As an example, the number of extrusion rods 122 may be, but is not limited to, three, four, or five, etc.

[0060] Please refer to Figure 10 and Figure 11 The 3D printer 100 of this application includes a nozzle device 20 and an extrusion device 10 provided in any of the above embodiments. The extrusion device 10 is used to extrude the filament 200 into the nozzle device 20.

[0061] In the 3D printer 100 of this application embodiment, the drive assembly 11 drives the rotating base 121, which is coaxially connected to the drive assembly 11, to rotate. This causes multiple extrusion rods 122 connected to the rotating base 121 to rotate synchronously. As the multiple extrusion rods 122 rotate, they jointly clamp and push the filament 200 to move along the axial direction of the rotating base 121, increasing the clamping contact area of ​​the filament 200. This improves the pushing force and the uniformity of force distribution, effectively preventing the filament 200 from slipping or deviating during the pushing process. At the same time, the drive assembly 11 and the rotating base 121 are coaxially directly connected, which can also reduce the energy loss and response delay of multi-stage transmission, thereby improving printing accuracy while ensuring sufficient and continuous material supply.

[0062] In some implementation methods, please refer to Figure 10 and Figure 11 The 3D printer 100 also includes a bracket 30 and a force sensor 40. The force sensor 40 is used to detect the extrusion force of the feeding assembly 12. The force sensor 40 is mounted on the bracket 30, and the drive assembly 11 and / or nozzle device 20 are connected to the bracket 30 through the force sensor 40. As an example, the force sensor 40 can be a strain gauge.

[0063] In one implementation, the 3D printer 100 includes a first force sensor 41 and / or a second force sensor 42. A drive assembly 11 is fixed to the first force sensor 41, which is fixed to a bracket 30. A nozzle assembly is fixed to the second force sensor 42, which is also fixed to the bracket 30. When the feeding assembly 12 is feeding normally, the extrusion force of the feeding assembly 12 is constant. Simultaneously, the feeding assembly 12 is directly driven to rotate by the drive assembly 11, and the drive assembly 11 and the feeding assembly 12 are coaxially connected. Therefore, the extrusion force of the feeding assembly 12 is the magnitude of the force fed back by the first force sensor 41 during operation. If the nozzle assembly 20 becomes clogged, the extrusion force increases, and the value fed back by the first force sensor 41 changes accordingly, thus indicating that the nozzle assembly 20 is clogged. For example, after the nozzle assembly 20 is clogged, the 3D printer 100 can be triggered to stop printing, preventing the 3D printer 100 from continuing to operate and causing the molten filament 200 to carbonize in the event of a blockage. After the feedback system becomes clogged, it can also trigger the 3D printer 100 to increase the output force of the drive component 11 and / or increase the heating temperature of the nozzle device 20, thereby clearing the nozzle device 20 and solving the problem of nozzle device 20 clogging.

[0064] 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.

[0065] 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 apparatus for a 3D printer, characterized in that, include: Driver components; as well as The feeding assembly includes a rotating base coaxially connected to the drive assembly and a plurality of extrusion rods for clamping the wire. The plurality of extrusion rods are rotatably connected to the rotating base and arranged around the axis of the rotating base. The drive assembly is used to drive the feeding assembly to rotate, so that the extrusion rods holding the wire together push the wire to move along the axial direction of the rotating seat.

2. The extrusion apparatus as claimed in claim 1, characterized in that, The rotating base includes a first connector coaxially connected to the output shaft of the drive assembly and a plurality of second connectors arranged around the axis of the first connector. Each of the plurality of second connectors corresponds to a plurality of extrusion rods, and the extrusion rods are connected to the corresponding second connectors. The second connectors are movably connected to the first connectors, and the second connectors can drive the extrusion rods to a first position for clamping the wire and a second position for releasing the wire.

3. The extrusion apparatus as described in claim 2, characterized in that, The second connector is hinged or slidably connected to the first connector, and the rotating seat further includes an elastic element for pushing the second connector to cause the extrusion rod to clamp the wire.

4. The extrusion apparatus as described in claim 3, characterized in that, The second connector includes a first connecting arm connected at one end to the extrusion rod and a second connecting arm connected at the other end of the first connecting arm, and the two ends of the elastic member abut against the first connecting arm and the first connector, respectively. When the elastic element pushes the free end of the first connecting arm close to the axis of the rotating seat, the second connecting arm protrudes from the outer periphery of the first connecting element; and / or, The elastic element is a spring.

5. The extrusion apparatus as described in claim 2, characterized in that, The rotating base also includes a plurality of mounting blocks that connect the second connector to the extrusion rod, and the plurality of mounting blocks correspond one-to-one with the plurality of the second connectors.

6. The extrusion apparatus as claimed in claim 1, characterized in that, The output shaft of the drive assembly has a first conveying hole in the middle for conveying the wire; the rotating seat has a second conveying hole in the middle for conveying the wire.

7. The extrusion apparatus as claimed in claim 1, characterized in that, The extrusion rod is rotatably connected to the rotating seat; and / or, the extrusion rod is a worm gear or a screw; or... The extrusion rod includes a support rod connected to the rotating seat and a screw sleeve rotatably fitted onto the support rod.

8. The extrusion apparatus as claimed in claim 1, characterized in that, The axis of the extrusion rod is inclined relative to the axis of the rotating seat, and the angle between the axis of each extrusion rod and the axis of the rotating seat is the same.

9. A 3D printer, characterized in that, include: Nozzle device; and The extrusion apparatus according to any one of claims 1 to 8, wherein the extrusion apparatus is used to extrude the wire into the nozzle apparatus.

10. The 3D printer as described in claim 9, characterized in that, The 3D printer also includes a bracket and a force sensor for detecting the extrusion force of the feeding assembly. The force sensor is mounted on the bracket, and the drive assembly and / or the nozzle device are connected to the bracket via the force sensor.

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