Extrusion mechanism, multi-extrusion device and 3D printer

Abstract

The application discloses an extrusion mechanism, a multi-extrusion device and a 3D printer, relates to the technical field of intelligent manufacturing equipment, and through setting the first fixed shell and the second fixed shell as a structure capable of moving relative to each other, a certain adjustment space is formed between the first extrusion wheel and the second extrusion wheel, the interval between the first extrusion wheel and the second extrusion wheel can be changed, the switching of the extrusion mechanism between an extrusion state and an idle state is realized, the first extrusion wheel and the second extrusion wheel can be close to each other to clamp and push the wire in the wire conveying space when wire extrusion is needed, and then the wire extrusion is realized; moreover, the interval between the first extrusion wheel and the second extrusion wheel can be changed according to different thicknesses of the wire, so that the wire in the wire conveying space is always clamped by the first extrusion wheel and the second extrusion wheel, high-quality extrusion can be realized, the phenomenon of slipping is avoided, and the printing quality is improved.

Description

Technical Field

[0001] This application relates to the field of intelligent manufacturing equipment technology, and in particular to an extrusion mechanism, a multi-extrusion device, and a 3D printer. Background Technology

[0002] Currently, multicolor 3D printing requires the selection of different filaments according to the printing color requirements, and filament switching is necessary. Therefore, multiple extrusion mechanisms and their corresponding drive and layout designs are required.

[0003] In existing technologies, a rotating turntable is generally used to engage the extrusion mechanism with the output of the drive motor to drive the extrusion. This design, in which the turntable drives the extrusion mechanism to rotate, is prone to errors in the movement position of the motor, which can cause the extrusion mechanism to fail to deliver the material line or to have insufficient force in the output material line, resulting in slippage and affecting the printing speed and printing quality. Utility Model Content

[0004] The purpose of this application is to provide an extrusion mechanism, a multi-extrusion device, and a 3D printer that can achieve high-quality extrusion, avoid slippage, and improve print quality.

[0005] The embodiments of this application can be implemented as follows:

[0006] In a first aspect, embodiments of this application provide an extrusion mechanism, including:

[0007] A first fixed housing and a first extrusion wheel rotatably disposed on the first fixed housing;

[0008] The second fixed housing and the second extrusion wheel rotatably disposed on the second fixed housing;

[0009] The first extrusion wheel and the second extrusion wheel are arranged correspondingly, and a wire conveying space is formed between them;

[0010] The first fixed shell and the second fixed shell are movably connected so as to change the distance between the first extrusion wheel and the second extrusion wheel, thereby putting the extrusion mechanism into a feeding state or an idle state;

[0011] In the extrusion state, the first extrusion wheel and the second extrusion wheel clamp and push the wire in the wire conveying space;

[0012] In the idle state, the first extrusion wheel and the second extrusion wheel release and stop pushing the wire in the wire conveying space.

[0013] In an optional embodiment, an elastic element is provided between the first fixed shell and the second fixed shell, the elastic element being used to cause the first fixed shell and the second fixed shell to have a tendency to move away from each other.

[0014] In an optional embodiment, the first fixed shell and the second fixed shell are rotatably connected;

[0015] The elastic element includes a first torsion spring, which includes a main body and two ends connected to the main body. The main body is sleeved outside the rotation axis between the first fixed shell and the second fixed shell, and the two ends respectively abut against the first fixed shell and the second fixed shell.

[0016] In an optional embodiment, the first extrusion wheel is an active extrusion wheel, and a wire input pipe is provided between the first extrusion wheel and the second extrusion wheel. The wire input pipe is fixed to the first fixed shell, and the wire input pipe is provided with two notches communicating with its own inner cavity. The first extrusion wheel and the second extrusion wheel correspond to the two notches respectively.

[0017] In an optional embodiment, the first extrusion wheel includes a first gear portion and a first extrusion portion coaxially connected, and the first extrusion portion is provided with a first clamping groove that surrounds the circumference.

[0018] The second extrusion wheel includes a second gear section and a second extrusion section coaxially connected, and the second extrusion section is provided with a second clamping groove that surrounds the circumference;

[0019] The first gear section and the second gear section can mesh or separate, and the first clamping groove and the second clamping groove form the wire conveying space.

[0020] Secondly, embodiments of this application disclose a multi-extrusion apparatus, comprising:

[0021] Extrusion drive mechanism;

[0022] The above-mentioned extrusion mechanisms are provided, and the extrusion drive mechanism is connected to the first extrusion wheel or the second extrusion wheel in each of the extrusion mechanisms so as to be able to drive all the first extrusion wheels or the second extrusion wheels to rotate simultaneously;

[0023] The selection mechanism is movable relative to all the extrusion mechanisms to selectively engage or disengage with any one of the extrusion mechanisms; when the selection mechanism engages with the extrusion mechanism, the extrusion mechanism is in the extrusion state, and when the selection mechanism disengages from the extrusion mechanism, the extrusion mechanism is in the idle state.

[0024] In an optional embodiment, all of the extrusion mechanisms are arranged in a circumferential array;

[0025] The selection mechanism is movably disposed on the outer circumference of all the extrusion mechanisms to engage with or disengage from any of the extrusion mechanisms.

[0026] In an optional embodiment, the selection mechanism includes a rotating cylinder, a mating component, and a selection drive assembly;

[0027] The rotating cylinder is sleeved on the outer circumference of all the extrusion mechanisms;

[0028] The selection drive component is connected to the rotating cylinder via a transmission, and is used to drive the rotating cylinder to rotate relative to all of the extrusion mechanisms;

[0029] The mating component is connected to the rotating cylinder and can move in a circular motion around all the extrusion mechanisms under the drive of the rotating cylinder, so as to mate or separate with the first fixed shell or the second fixed shell of any of the extrusion mechanisms.

[0030] In an optional implementation, the selection drive assembly includes a first gear ring and a selection drive source that are connected in a transmission connection.

[0031] The first gear ring is coaxially connected to the rotating cylinder;

[0032] The selected drive source is used to drive the first gear ring to rotate, thereby causing the rotating cylinder to rotate relative to all of the extrusion mechanisms.

[0033] In an optional embodiment, the mating component includes a mating swing arm and an abutting roller rotatably connected to one end of the mating swing arm;

[0034] The other end of the swing arm is rotatably connected to the rotating cylinder, so that the abutting roller abuts against and presses against the first fixed shell or the second fixed shell under the drive of the rotating cylinder, so that the extrusion mechanism switches to the extrusion state, or separates the abutting roller from the first fixed shell or the second fixed shell, so that the extrusion mechanism switches to the idle state.

[0035] In an optional embodiment, a second torsion spring is provided at the connection between the mating swing arm and the rotating cylinder. The second torsion spring is used to give the end of the mating swing arm where the abutting roller is located a tendency to move away from the rotating cylinder.

[0036] In an optional embodiment, the side of the first fixing shell facing away from the second fixing shell or the side of the second fixing shell facing away from the first fixing shell has an outwardly convex arc surface, which is used for the abutting roller to abut against.

[0037] In an optional embodiment, the first extrusion wheel is a drive wheel, and the selection mechanism is used to push the second fixed shell toward the first fixed shell from the side of the second fixed shell away from the first fixed shell during the movement relative to the extrusion mechanism.

[0038] In an optional embodiment, the extrusion mechanism further includes a third drive wheel coaxially connected to the first extrusion wheel or the second extrusion wheel;

[0039] The extrusion drive mechanism includes an extrusion drive source and a transmission assembly that are connected in a transmission connection, and the transmission assembly is connected in a transmission connection with the third transmission wheel.

[0040] The transmission assembly includes multiple sub-transmission assemblies, each sub-transmission assembly corresponding to a position of the extrusion mechanism. Each sub-transmission assembly includes a second transmission wheel, a transmission shaft, and a first transmission wheel coaxially connected. The first transmission wheel is driven by the extrusion drive source, and each second transmission wheel is driven by a third transmission wheel of the extrusion mechanism.

[0041] In an optional embodiment, the transmission assembly further includes an output gear and a second gear ring, the output gear being coaxially connected to the output shaft of the extrusion drive source, and both the output gear and the first transmission wheel meshing with the second gear ring;

[0042] Alternatively, the transmission assembly may further include an output gear and a transition gear set, wherein the output gear is coaxially connected to the output shaft of the extrusion drive source, the transition gear set includes a transition gear, and both the output gear and the first transmission wheel mesh with the transition gear set;

[0043] Alternatively, the transmission assembly may further include an output wheel and a timing belt, wherein the output wheel is coaxially connected to the output shaft of the extrusion drive source, and the timing belt is wound around the output wheel and all of the first transmission wheels.

[0044] In an optional embodiment, the second drive wheel includes a first bevel gear, and the third drive wheel includes a second bevel gear, the second bevel gear meshing with the first bevel gear.

[0045] Thirdly, embodiments of this application provide a 3D printer including the aforementioned multi-extrusion apparatus.

[0046] Compared with the prior art, the beneficial effects of the embodiments of this application include, for example:

[0047] By setting the first and second fixed shells as structures that can move relative to each other, a certain adjustment space can be provided between the first and second extrusion wheels, thereby changing the distance between them and enabling the extrusion mechanism to switch between extrusion and idle states. When wire extrusion is required, the first and second extrusion wheels can be brought closer together to clamp and push the wire in the wire conveying space, thus achieving wire extrusion. Moreover, the distance between the first and second extrusion wheels can be adjusted according to the wire thickness to ensure that the wire in the wire conveying space is always clamped by the first and second extrusion wheels, thereby achieving high-quality extrusion, avoiding slippage, and improving print quality. When wire extrusion is not required, the first and second extrusion wheels can be moved apart to release and stop pushing the wire in the wire conveying space. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0049] Figure 1 This is one of the schematic diagrams of the multi-extrusion apparatus according to an embodiment of this application;

[0050] Figure 2 This is a second schematic diagram of the multi-extrusion device according to an embodiment of this application;

[0051] Figure 3 for Figure 2 A schematic diagram of the meshing of the extrusion mechanism and the first bevel gear;

[0052] Figure 4 for Figure 3 An explosion diagram;

[0053] Figure 5 for Figure 1 and Figure 2 Schematic diagram of the assembly of the extrusion mechanism and the transmission gear;

[0054] Figure 6 for Figure 1 and Figure 2 A schematic diagram of the transmission structure of the first and second bevel gears;

[0055] Figure 7 This is a simplified schematic diagram of the combined structure of the output gear, the second gear ring, and the first transmission wheel in another embodiment.

[0056] Figure 8This is a simplified schematic diagram of the combined structure of the output wheel, the timing belt, and the first transmission wheel in another embodiment.

[0057] Icons: 100 - Extrusion mechanism; 110 - First fixed housing; 120 - First extrusion wheel; 121 - First gear section; 122 - First extrusion section; 123 - First clamping groove; 130 - Second fixed housing; 131 - Arc surface; 140 - Second extrusion wheel; 141 - Second gear section; 142 - Second extrusion section; 143 - Second clamping groove; 150 - Wire input pipe; 151 - Notch; 160 - Elastic element; 161 - Main body; 162 - End; 170 - Rotating shaft; 200 - Extrusion drive source; 210 - First drive wheel; 220 - Second drive wheel; 230 - Third drive wheel; 240 - Output gear; 250 - Transition gear; 260 - Drive shaft; 270 - Sub-drive assembly; 280 - Second gear ring; 290 - Synchronous belt; 291 - Output wheel; 300 - Rotating cylinder; 310 - First gear ring; 320 - Select drive source; 330 - Coupling swing arm; 340 - Abutting roller. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of 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. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0062] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0063] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0065] refer to Figure 1 and Figure 2 This application discloses an extrusion mechanism 100 and a multi-extrusion device having the extrusion mechanism 100. The multi-extrusion device includes an extrusion drive mechanism and a plurality of extrusion mechanisms 100. The extrusion drive mechanism is driven to each extrusion mechanism 100 to drive the extrusion mechanism 100 and provide extrusion power.

[0066] Combination Figures 3 to 5 The extrusion mechanism 100 includes a first fixed housing 110, a first extrusion wheel 120, a second fixed housing 130, and a second extrusion wheel 140. The first extrusion wheel 120 is rotatably disposed in the first fixed housing 110, and the second extrusion wheel 140 is rotatably disposed in the second fixed housing 130. One of the first extrusion wheel 120 and the second extrusion wheel 140 is a driving extrusion wheel, and the other is a driven extrusion wheel.

[0067] The extrusion drive mechanism is driven by the active extrusion wheel in each extrusion mechanism 100 so as to drive all active extrusion wheels to rotate simultaneously. If the first extrusion wheel 120 is the active extrusion wheel, the extrusion drive mechanism is driven by the first extrusion wheel 120. If the second extrusion wheel 140 is the active extrusion wheel, the extrusion drive mechanism is driven by the second extrusion wheel 140. That is, the extrusion drive mechanism is driven by the first extrusion wheel 120 or the second extrusion wheel 140 in each extrusion mechanism 100 so as to drive all first extrusion wheels 120 or the second extrusion wheel 140 to rotate simultaneously.

[0068] In some other embodiments, if the first extrusion wheel 120 and the second extrusion wheel 140 in each extrusion mechanism 100 are both active extrusion wheels, then the extrusion drive mechanism is connected to the first extrusion wheel 120 and the second extrusion wheel 140 in each extrusion mechanism 100 so as to drive all the first extrusion wheels 120 and the second extrusion wheel 140 to rotate simultaneously.

[0069] The first extrusion wheel 120 and the second extrusion wheel 140 are arranged correspondingly, and there is a wire conveying space between them; the first fixed shell 110 and the second fixed shell 130 are movably connected to change the distance between the first extrusion wheel 120 and the second extrusion wheel 140, so that the extrusion mechanism 100 is in an extrusion state or an idle state. In the extrusion state, the first extrusion wheel 120 and the second extrusion wheel 140 clamp and push the wire in the wire conveying space; in the idle state, the first extrusion wheel 120 and the second extrusion wheel 140 release and stop pushing the wire in the wire conveying space.

[0070] Thus, by setting the first fixed shell 110 and the second fixed shell 130 as structures that can move with each other, there can be a certain adjustment space between the first extrusion wheel 120 and the second extrusion wheel 140, thereby changing the distance between the first extrusion wheel 120 and the second extrusion wheel 140, realizing the switching of the extrusion mechanism 100 between the extrusion state and the idle state. When wire extrusion is required, the first extrusion wheel 120 and the second extrusion wheel 140 can be brought closer to clamp and push the wire in the wire conveying space, thereby realizing the extrusion of the wire. Moreover, the distance between the first extrusion wheel 120 and the second extrusion wheel 140 can be adjusted according to the different thicknesses of the wire to ensure that the wire in the wire conveying space is always clamped by the first extrusion wheel 120 and the second extrusion wheel 140, thus achieving high-quality extrusion, avoiding slippage, and improving printing quality. When wire extrusion is not required, the first extrusion wheel 120 and the second extrusion wheel 140 can be moved away from each other to release and stop pushing the wire in the wire conveying space.

[0071] Furthermore, in existing technologies, different color lines are repeatedly switched during multi-color printing, while the effector platform continues to print. The movement of the turntable causes significant vibration, requiring a long time and making it difficult to stably supply lines to multiple printheads.

[0072] In this application, during the multi-color printing process using multiple extrusion mechanisms 100, the first extrusion wheel 120 and the second extrusion wheel 140 of a portion of the extrusion mechanisms 100 are brought close together to compress the wire in the wire output space, thereby achieving selective extrusion of the wire. Therefore, the position of the extrusion mechanism 100 can remain stationary, reducing vibration during the printing process and allowing for rapid filament switching. Simultaneously, the first fixing shell 110 and the second fixing shell 130 serve as both supports for the extrusion wheels and provide protection, resulting in higher integration.

[0073] In this embodiment, the first extrusion wheel 120 is the driving extrusion wheel, the second extrusion wheel 140 is the driven extrusion wheel, and the first extrusion wheel 120 and the second extrusion wheel 140 are engaged by teeth.

[0074] Specifically, in combination Figures 4 to 6 The first extrusion wheel 120 includes a first gear portion 121 and a first extrusion portion 122 coaxially connected. The first extrusion portion 122 is provided with a first clamping groove 123 surrounding the first part. The second extrusion wheel 140 includes a second gear portion 141 and a second extrusion portion 142 coaxially connected. The second extrusion portion 142 is provided with a second clamping groove 143 surrounding the second part. The first gear portion 121 and the second gear portion 141 can mesh or separate. The first clamping groove 123 and the second clamping groove 143 form a wire conveying space.

[0075] The first extrusion wheel 120 and the second extrusion wheel 140 can be an integral structure, that is, the first gear part 121 and the first extrusion part 122 are integrally connected, and the second gear part 141 and the second extrusion part 142 are integrally connected. Of course, in some embodiments, the first gear part 121 and the first extrusion part 122 can also be separate structures, and the second gear part 141 and the second extrusion part 142 can also be separate structures.

[0076] The extrusion mechanism 100 also includes a third drive wheel 230, which is coaxially connected to the active extrusion wheel. That is, the third drive wheel 230 is coaxially connected to the first extrusion wheel 120 or the second extrusion wheel 140. The third drive wheel 230 is connected to the extrusion drive component for transmission, so as to rotate under the drive of the extrusion drive mechanism, thereby driving the active extrusion wheel to rotate.

[0077] The extrusion drive mechanism includes an extrusion drive source 200 and a transmission assembly that are connected in a transmission manner. The transmission assembly is connected in a transmission manner to a third transmission wheel 230 to realize the transmission of the driving force provided by the drive source to the active extrusion wheel.

[0078] The extrusion drive source 200 includes, but is not limited to, a drive motor, as long as it is a power device that can provide torque.

[0079] Specifically, the transmission assembly includes multiple sub-transmission assemblies 270, the number of which is the same as the number of extrusion mechanisms 100. Each sub-transmission assembly 270 includes a first transmission wheel 210, a transmission shaft 260, and a second transmission wheel 220 that are coaxially connected. The number of the first transmission wheel 210, the transmission shaft 260, and the third transmission wheel 230 is the same as the number of extrusion mechanisms 100. The first transmission wheel 210 is connected to the extrusion drive source 200, and the third transmission wheel 230 is connected to the third transmission wheel 230 of an extrusion mechanism 100, thereby realizing the power transmission of the extrusion drive source 200.

[0080] For example, in the illustrated embodiment, the transmission assembly further includes an output gear 240, which is coaxially connected to the output shaft of the extrusion drive source 200. The first transmission wheel 210 includes a transmission gear, which is connected to the output gear 240 in a transmission manner. In this way, power is transmitted from the extrusion drive source 200 to the first transmission wheel 210 through gear transmission, thereby realizing the rotation of the active extrusion wheel.

[0081] More specifically, the transmission assembly also includes a transition gear set, which includes at least one transition gear 250. The number of transition gears is the same as the number of transmission gears. The output gear 240 and the first transmission wheel 210 (transmission gear) mesh with the transition gear 250 so that the transmission gear drives the third transmission wheel 230 to rotate via the transmission shaft 260, and then drives the active extrusion wheel of each extrusion mechanism 100 to rotate by driving the third transmission wheel 230.

[0082] In this embodiment, the third transmission wheel 230 includes a first bevel gear and a second bevel gear. The second bevel gear meshes with the first bevel gear. Thus, the torque of the extrusion drive source 200 is transmitted to the first bevel gear in sequence through the output gear 240, the transition gear 250 and the transmission gear. The direction of the driving force can be changed through the first bevel gear and the second bevel gear, thereby driving the active extrusion wheel to rotate.

[0083] In addition, in some embodiments, the extrusion drive mechanism can also use other worm gear mechanism, gear and rack mechanism, belt drive mechanism or chain drive mechanism to realize power transmission, as long as it can drive the active extrusion wheel to rotate, and the specific structure is not much restricted.

[0084] For example, refer to Figure 7The output shaft of the extrusion drive source 200 can also mesh with the transmission gear via a gear ring, which can include external or internal teeth. Specifically, the transmission assembly also includes a second gear ring 280, which can include an external gear ring, an internal gear ring, or both. The output gear 240 and the first transmission wheel 210 (transmission gear) both mesh with the second gear ring 280. In this way, the power of the extrusion drive source 200 is transmitted to the transmission gear through the second gear ring 280 to make it rotate. The transmission gear then drives the third transmission wheel 230 to rotate via the transmission shaft 260, which in turn drives the active extrusion wheel to rotate.

[0085] For example, refer to Figure 8 The extrusion drive source 200 and the first transmission wheel 210 are connected by a chain or belt by installing a pulley on the output shaft of the extrusion drive source 200. Specifically, the transmission assembly also includes an output wheel 291 and a timing belt 290. The output wheel 291 is coaxially connected to the output shaft of the extrusion drive source 200, and the timing belt 290 is wound around the output wheel 291 and all the first transmission wheels 210. In this way, the output wheel 291 and the timing belt 290 drive the first transmission wheel 210 to rotate, thereby driving the third transmission wheel 230 of the extrusion mechanism 100 to rotate, thus realizing the rotation of the active extrusion wheel.

[0086] Continue to refer to Figures 4 to 6 In this embodiment, an elastic element 160 is provided between the first fixed shell 110 and the second fixed shell 130. The elastic element 160 is used to make the first fixed shell 110 and the second fixed shell 130 tend to move away from each other. Thus, without applying an external force to the extrusion mechanism 100 to bring the first fixed shell 110 and the second fixed shell 130 closer together, the first fixed shell 110 and the second fixed shell 130 will move away from each other due to the elastic force of the elastic element 160, thereby causing the first extrusion wheel 120 and the second extrusion wheel 140 to separate and disengage from the meshing state. While the first extrusion wheel 120 is driven by the extrusion drive mechanism to keep rotating, the second extrusion wheel 140 will not rotate, and the wire will not be extruded. Only when the first fixed shell 110 and the second fixed shell 130 are brought close together by an external force until the first extrusion wheel 120 and the second extrusion wheel 140 mesh, will the first extrusion wheel 120 drive the second extrusion wheel 140 to rotate together, and the two together press the wire, thereby realizing the extrusion function. After the external force is removed, the elastic element 160 can also automatically reset to separate the first extrusion wheel 120 and the second extrusion wheel 140.

[0087] Specifically, the first fixed shell 110 and the second fixed shell 130 are rotatably connected, so the first fixed shell 110 and the second fixed shell 130 only need to be connected by a rotating shaft 170, which is simple in structure and easy to implement. The rotating shaft 170 can be a screw or a pin, as long as it can achieve the rotatable connection between the first fixed shell 110 and the second fixed shell 130.

[0088] More specifically, the elastic element 160 includes a first torsion spring, which includes a main body 161 and two ends 162 connected to the main body 161. The main body 161 is sleeved outside the rotating shaft 170 between the first fixed shell 110 and the second fixed shell 130. The two ends 162 respectively abut against the first fixed shell 110 and the second fixed shell 130, thereby achieving the effect of separating the first extrusion wheel 120 and the second extrusion wheel 140 without external force.

[0089] In this embodiment, the wire output space is formed by a fixed pipe. For example, a wire input pipe 150 is provided between the first extrusion wheel 120 and the second extrusion wheel 140. The inner cavity of the wire input pipe 150 forms a wire conveying space. The wire input pipe 150 is fixed to the first fixed shell 110, and the wire input pipe 150 is provided with two notches 151 that communicate with its own inner cavity. The first extrusion wheel 120 and the second extrusion wheel 140 correspond to the two notches 151 respectively. In this way, when the first extrusion wheel 120 and the second extrusion wheel 140 are close to each other, the wire in the wire input pipe 150 can be extruded through the notches 151.

[0090] Continue to refer to Figures 1 to 4 In order to enable the second fixed housing 130 to rotate relative to the first fixed housing 110 so that the extrusion mechanism 100 can switch between the extrusion state and the idle state, the multi-extrusion device also includes a selection mechanism that is movable relative to all extrusion mechanisms 100 to selectively engage or disengage with any one of the extrusion mechanisms 100; when the selection mechanism engages with the extrusion mechanism 100, the extrusion mechanism 100 is in the extrusion state, and when the selection mechanism disengages from the extrusion mechanism 100, the extrusion mechanism 100 is in the idle state.

[0091] Specifically, all extrusion mechanisms 100 are arranged in a circumferential array; the selection mechanism is movably disposed on the outer side of the circumference of all extrusion mechanisms 100 to cooperate with or separate from any extrusion mechanism 100, thereby achieving selective extrusion of wire.

[0092] Specifically, in this embodiment, the selection mechanism includes a rotating cylinder 300, a mating component, and a selection drive assembly; the rotating cylinder 300 is sleeved on the outer circumference of all extrusion mechanisms 100; the selection drive assembly is connected to the rotating cylinder 300 for driving the rotating cylinder 300 to rotate relative to all extrusion mechanisms 100; the mating component is connected to the rotating cylinder 300 and can move circumferentially around all extrusion mechanisms 100 under the drive of the rotating cylinder 300, so as to engage or disengage with the first fixed shell 110 or the second fixed shell 130 of any extrusion mechanism 100.

[0093] The selectable drive assembly includes a first gear ring 310 and a selectable drive source 320 connected by a transmission connection; the first gear ring 310 is coaxially connected to the rotating cylinder 300. For example, in the illustrated embodiment, the first gear ring 310 is an internal gear ring, which is coaxially disposed on the inner side wall of the rotating cylinder 300.

[0094] The selected drive source 320 includes, but is not limited to, a drive motor. This selected drive source 320 is used to drive the first gear ring 310 to rotate, thereby causing the rotating cylinder 300 to rotate relative to all the extrusion mechanisms 100. For example, the first gear ring 310 can be driven to rotate via gear transmission. Moreover, the use of an internal gear ring for the first gear ring 310 allows each extrusion mechanism 100 to be closer to the central axis of the rotating cylinder 300, resulting in a more compact structure and smaller size for the entire multi-extrusion device.

[0095] Of course, in some embodiments, the first gear ring 310 may also be an external gear ring, which is coaxially disposed on the outer side wall of the rotating cylinder 300.

[0096] Since the first extrusion wheel 120 is an active extrusion wheel in this embodiment, the selection mechanism is used to push the second fixed shell 130 toward the first fixed shell 110 from the side of the second fixed shell 130 away from the first fixed shell 110 during the movement relative to the extrusion mechanism 100.

[0097] The mating component is located on the side of the second fixed housing 130 facing away from the first fixed housing 110. The mating component includes a mating swing arm 330 and an abutting roller 340 rotatably connected to one end of the mating swing arm 330. The other end of the mating swing arm 330 is rotatably connected to the rotating cylinder 300 so that the abutting roller 340 abuts against and presses the second fixed housing 130 under the drive of the rotating cylinder 300, thereby causing the second fixed housing 130 to move closer to the first fixed housing 110, and the extrusion mechanism 100 switches to the extrusion state. If it is necessary to switch the extrusion mechanism to the idle state, it is only necessary to continue rotating the rotating cylinder 300. In this way, the abutting roller 340 will roll relative to the second fixed housing 130 until the abutting roller 340 separates from the second fixed housing 130. In this way, the second fixed housing 130 can move away from the first fixed housing 110, and the extrusion mechanism 100 switches to the idle state. Furthermore, when the swing arm 330 pushes the second fixed housing 130 toward the first fixed housing 110 with the abutting roller 340, the abutting roller 340 will roll relative to the second fixed housing 130 to reduce friction and damage.

[0098] The side of the second fixed shell 130 facing away from the first fixed shell 110 has an outwardly convex arc surface 131. The arc surface 131 is used for the abutting roller 340 to abut against. This allows the abutting roller 340 to roll on the arc surface 131 as the second fixed shell 130 approaches the first fixed shell 110, thereby ensuring the smoothness of the second fixed shell 130 rotating towards the first fixed shell 110.

[0099] In addition, a second torsion spring is provided at the connection between the swing arm 330 and the rotating cylinder 300. The second torsion spring is used to make the end of the swing arm 330 with the abutting roller 340 move away from the rotating cylinder 300, so that the swing arm 330 can automatically reset after being separated from the second fixed housing 130.

[0100] Of course, in some embodiments where the second extrusion wheel 140 is an active extrusion wheel, the extrusion mechanism 100 can also be pushed by the side of the first fixed housing 110 away from the second fixed housing 130 towards the second fixed housing 130. In this case, the mating component is located on the side of the first fixed housing 110 away from the second fixed housing 130, and the mating swing arm 330 can drive the abutment roller 340 to abut against the first fixed housing 110, causing the first fixed housing 110 to move towards the second fixed housing 130, and the extrusion mechanism 100 enters the extrusion state. As the rotating cylinder 300 continues to rotate, the abutment roller 340 rolls on the first fixed housing 110 until it separates from the first fixed housing 110, thus moving the first fixed housing 110 away from the second fixed housing 130, and the extrusion mechanism 100 enters an idle state. The side of the first fixed housing 110 away from the second fixed housing 130 has a convex arc surface 131.

[0101] In addition, in some embodiments, the elastic element 160 may also be a tubular spring, with its two ends connected to the first fixed housing 110 near the first extrusion wheel 120 and the second fixed housing 130 near the second extrusion wheel 140, respectively, which can also achieve the effect of separating the first extrusion wheel 120 and the second extrusion wheel 140.

[0102] In some embodiments, the first fixed housing 110 and the second fixed housing 130 can move between the first and second positions via a sliding block. In the first position, the first extrusion wheel 120 and the second extrusion wheel 140 are fully engaged, and in the second position, the first extrusion wheel 120 and the second extrusion wheel 140 are completely disengaged. As long as the distance between the first extrusion wheel 120 and the second extrusion wheel 140 can be adjusted to achieve separation and engagement, as well as adjustment of the extrusion pressure on the wire input channel 150, it is acceptable. Alternatively, an elastic element 160 can be used to abut between the first fixed housing 110 and the second fixed housing 130 to allow for some adjustment space for the engagement between the driven extrusion wheel and the driving extrusion wheel. The successful engagement area is a range, that is, by selecting an external force to push the mating swing arm 330 of the second fixed housing 130 to engage within a certain length range or a certain area along the movement trajectory of the mating swing arm 330 on the second fixed housing 130, the engagement between the driven extrusion wheel and the driving extrusion wheel can be achieved, resulting in high-quality extrusion, avoiding slippage, and improving printing quality.

[0103] In addition, this application also discloses a 3D printer, which includes the multi-extrusion device of the above embodiments, and therefore also has the corresponding structure and effects, which will not be repeated here, please refer to the above content.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An extrusion mechanism, characterized in that, include: A first fixed housing (110) and a first extrusion wheel (120) rotatably disposed on the first fixed housing (110); The second fixed housing (130) and the second extrusion wheel (140) rotatably disposed on the second fixed housing (130); The first extrusion wheel (120) and the second extrusion wheel (140) are arranged correspondingly, and a wire conveying space is formed between them; The first fixed shell (110) and the second fixed shell (130) are movably connected so as to change the distance between the first extrusion wheel (120) and the second extrusion wheel (140), thereby putting the extrusion mechanism into a squeezing state or an idle state; In the extrusion state, the first extrusion wheel (120) and the second extrusion wheel (140) clamp and push the wire in the wire conveying space; In the idle state, the first extrusion wheel (120) and the second extrusion wheel (140) release and stop pushing the wire in the wire conveying space.

2. The extrusion mechanism according to claim 1, characterized in that, An elastic element (160) is provided between the first fixed shell (110) and the second fixed shell (130), and the elastic element (160) is used to make the first fixed shell (110) and the second fixed shell (130) have a tendency to move away from each other.

3. The extrusion mechanism according to claim 2, characterized in that, The first fixed shell (110) and the second fixed shell (130) are rotatably connected; The elastic element (160) includes a first torsion spring, which includes a main body (161) and two ends (162) connected to the main body (161). The main body (161) is sleeved outside the rotation shaft (170) between the first fixed shell (110) and the second fixed shell (130), and the two ends (162) respectively abut against the first fixed shell (110) and the second fixed shell (130).

4. The extrusion mechanism according to claim 1, characterized in that, The first extrusion wheel (120) is an active extrusion wheel. A wire input pipe (150) is provided between the first extrusion wheel (120) and the second extrusion wheel (140). The wire input pipe (150) is fixed to the first fixed shell (110), and the wire input pipe (150) is provided with two notches (151) communicating with its own inner cavity. The first extrusion wheel (120) and the second extrusion wheel (140) correspond to the two notches (151) respectively.

5. The extrusion mechanism according to claim 1, characterized in that, The first extrusion wheel (120) includes a first gear part (121) and a first extrusion part (122) coaxially connected, and the first extrusion part (122) is provided with a first clamping groove (123) surrounding it in a circumferential direction; The second extrusion wheel (140) includes a second gear part (141) and a second extrusion part (142) connected coaxially, and the second extrusion part (142) is provided with a second clamping groove (143) that surrounds the circumference; The first gear section (121) and the second gear section (141) can mesh or separate, and the first clamping groove (123) and the second clamping groove (143) form the wire conveying space.

6. A multi-extrusion apparatus, characterized in that, include: Extrusion drive mechanism; The extrusion mechanism according to any one of claims 1-5, wherein the extrusion drive mechanism is tractively connected to the first extrusion wheel (120) or the second extrusion wheel (140) in each of the extrusion mechanisms, so as to be able to drive all the first extrusion wheels (120) or the second extrusion wheels (140) to rotate simultaneously; The selection mechanism is movable relative to all the extrusion mechanisms to select whether to engage with or disengage from any one of the extrusion mechanisms; when the selection mechanism engages with the extrusion mechanism, the extrusion mechanism is in the extrusion state, and when the selection mechanism disengages from the extrusion mechanism, the extrusion mechanism is in the idle state.

7. The multi-extrusion apparatus according to claim 6, characterized in that, All of the extrusion mechanisms are arranged in a circumferential array; The selection mechanism is movably disposed on the outer circumference of all the extrusion mechanisms to engage with or disengage from any of the extrusion mechanisms.

8. The multi-extrusion apparatus according to claim 7, characterized in that, The selection mechanism includes a rotating cylinder (300), a mating component, and a selection drive assembly; The rotating cylinder (300) is sleeved on the outer circumference of all the extrusion mechanisms; The selection drive assembly is connected to the rotating cylinder (300) for driving the rotating cylinder (300) to rotate relative to all of the extrusion mechanisms; The mating component is connected to the rotating cylinder (300) and can move in a circular motion around all the extrusion mechanisms under the drive of the rotating cylinder (300) to mate or separate from the first fixed shell (110) or the second fixed shell (130) of any one of the extrusion mechanisms.

9. The multi-extrusion apparatus according to claim 8, characterized in that, The selection drive assembly includes a first gear ring (310) and a selection drive source (320) that are connected by a transmission. The first gear ring (310) is coaxially connected to the rotating cylinder (300); The selected drive source (320) is used to drive the first gear ring (310) to rotate, thereby causing the rotating cylinder (300) to rotate relative to the entire extrusion mechanism.

10. The multi-extrusion apparatus according to claim 8, characterized in that, The mating component includes a mating swing arm (330) and an abutment roller (340) rotatably connected to one end of the mating swing arm (330); The other end of the cooperating swing arm (330) is rotatably connected to the rotating cylinder (300) so that the abutting roller (340) abuts against and presses the first fixed shell (110) or the second fixed shell (130) under the drive of the rotating cylinder (300), so that the extrusion mechanism switches to the extrusion state, or separates the abutting roller (340) from the first fixed shell (110) or the second fixed shell (130), so that the extrusion mechanism switches to the idle state.

11. The multi-extrusion apparatus according to claim 10, characterized in that, A second torsion spring is provided at the connection between the cooperating swing arm (330) and the rotating cylinder (300). The second torsion spring is used to make the end of the cooperating swing arm (330) provided with the abutting roller (340) have a tendency to move away from the rotating cylinder (300).

12. The multi-extrusion apparatus according to claim 10, characterized in that, The side of the first fixing shell (110) facing away from the second fixing shell (130) or the side of the second fixing shell (130) facing away from the first fixing shell (110) has an outwardly convex arc surface (131), which is used for the abutting roller (340) to abut.

13. The multi-extrusion apparatus according to claim 6, characterized in that, The first extrusion wheel (120) is a drive wheel. The selection mechanism is used to push the second fixed shell (130) toward the first fixed shell (110) from the side of the second fixed shell (130) away from the first fixed shell (110) during the movement relative to the extrusion mechanism.

14. The multi-extrusion apparatus according to claim 6, characterized in that, The extrusion mechanism further includes a third transmission wheel (230) coaxially connected to the first extrusion wheel (120) or the second extrusion wheel (140); The extrusion drive mechanism includes an extrusion drive source (200) and a transmission assembly that are connected in a transmission connection. The transmission assembly is connected in a transmission connection with the third transmission wheel (230). The transmission assembly includes multiple sub-transmission assemblies (270), each sub-transmission assembly (270) corresponding to the position of the extrusion mechanism. Each sub-transmission assembly (270) includes a second transmission wheel (220), a transmission shaft (260), and a first transmission wheel (210) coaxially connected. The first transmission wheel (210) is connected to the extrusion drive source (200), and each second transmission wheel (220) is connected to a third transmission wheel (230) of the extrusion mechanism.

15. The multi-extrusion apparatus according to claim 14, characterized in that, The transmission assembly further includes an output gear (240) and a second gear ring. The output gear (240) is coaxially connected to the output shaft of the extrusion drive source (200). Both the output gear (240) and the first transmission wheel (210) mesh with the second gear ring. Alternatively, the transmission assembly may further include an output gear (240) and a transition gear set, wherein the output gear (240) is coaxially connected to the output shaft of the extrusion drive source (200), and the transition gear set includes a transition gear (250), wherein the output gear (240) and the first transmission wheel (210) both mesh with the transition gear set; Alternatively, the transmission assembly may further include an output wheel (291) and a timing belt (290), wherein the output wheel (291) is coaxially connected to the output shaft of the extrusion drive source (200), and the timing belt (290) is wound around the output wheel (291) and all of the first transmission wheels (210).

16. The multi-extrusion apparatus according to claim 14, characterized in that, The second transmission wheel (220) includes a first bevel gear, and the third transmission wheel (230) includes a second bevel gear, which meshes with the first bevel gear.

17. A 3D printer, characterized in that, Includes the multi-extrusion apparatus according to any one of claims 6-16.

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