3D printing equipment

Abstract

The utility model relates to the technical field of 3D printing, aims to solve the technical problem of how to optimize consumable switching, and provides 3D printing equipment which comprises a printing head and one or more consumable storage devices. The printhead includes one or more nozzles. One or more consumables are arranged in the consumable storage devices, one nozzle is connected to one consumable storage device, and the nozzles are configured to perform extrusion molding on the consumables in the consumable storage devices. The high-precision 3D printing device has the beneficial effects that the printing precision of the 3D printing device and switching of different consumables are considered, and high-precision printing work of the multiple consumables is achieved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and more specifically, to 3D printing equipment. Background Art

[0002] 3D printing technology is a rapid prototyping technique that uses digital model files as a foundation and employs adhesive materials such as special waxes, powdered metals, or plastics to create three-dimensional objects by printing layer by layer. Fused deposition modeling (FDP) is one of the primary 3D printing technologies. This technique involves melting a hot-melt filament, extruding it from a nozzle, and depositing it onto a build platform or a previously solidified layer of material, ultimately creating the object. During the 3D printing process, switching between different consumables can be challenging. Optimizing this process is a critical consideration for those skilled in the art. Utility Model Content

[0003] In order to solve the problems in the known technology, the present application provides a 3D printing device.

[0004] The present application provides a 3D printing device, comprising a print head and one or more consumable storage devices. The print head includes one or more nozzles. One or more consumable storage devices contain one or more consumables, and a nozzle is connected to each consumable storage device, wherein the nozzle is configured to extrude the consumables in the consumable storage device into a shape.

[0005] According to the 3D printing device of the present application, since one or more nozzles are integrated in the print head, compared with increasing the number of transmission channels by setting multiple print heads, the weight of the print head can be reduced, the movement accuracy of the print head can be higher, and the molding quality of the molded parts can be improved.

[0006] In one possible implementation:

[0007] The consumable storage device includes at least one material rack and at least one first extrusion assembly, the material rack is configured to store the consumable; the first extrusion assembly corresponds to the material rack one-to-one, and the first extrusion assembly is used to extrude the consumable to the nozzle, or push the consumable back to the material rack.

[0008] In one possible implementation:

[0009] The print head includes at least one hot melt component, which defines a hot melt channel. The hot melt component is connected to the nozzle. The hot melt channel is in communication with the nozzle. At least one of the hot melt components has a printing position and a standby position. In the printing position, the hot melt component extrude the consumable material. In the standby position, the hot melt component stops extruding the consumable material. The 3D printing device also includes a switching component, which is configured to selectively arrange each of the hot melt components in the printing position or the standby position, wherein the height of the nozzle connected to the hot melt component located at the printing position is lower than the height of the nozzle connected to the hot melt component located at the standby position.

[0010] In one possible implementation:

[0011] The switching component includes a switching drive and a transmission component, the switching drive is connected to the transmission component, the transmission component is transmission-connected to at least one of the hot melt components, and is configured to drive at least one of the hot melt components to switch between the printing position and the standby position under the drive of the switching drive; and / or, the switching component includes a transmission component, the transmission component is configured to abut against each of the hot melt components, and the transmission component is configured to drive at least one of the hot melt components to switch between the printing position and the standby position when triggered.

[0012] In one possible implementation:

[0013] The print head is also provided with a transmission channel, which is connected to the nozzle and is configured to transmit the consumables between the nozzle and the consumable storage device; the 3D printing device also includes a material cutting component, which is movably connected to the print head and is configured to move relative to the print head when triggered and enter at least one of the transmission channels to cut off the consumables in the transmission channel.

[0014] In one possible implementation:

[0015] The print head includes a first transmission channel group and a second transmission channel group, the first transmission channel group and the second transmission channel group are spaced apart along a first direction, the first transmission channel group includes at least one transmission channel, and the second transmission channel group includes at least one transmission channel; the 3D printing device includes a first material cutting component and a second material cutting component; the first material cutting component is located on a side of the first transmission channel component away from the second transmission channel group along the first direction, and the first material cutting component is configured to enter at least one transmission channel of the first transmission channel group to cut off the consumable material in the transmission channel; the second material cutting component is located on a side of the second transmission channel group away from the first transmission channel group along the first direction, and the second material cutting component is configured to enter at least one transmission channel of the second transmission channel group to cut off the consumable material in the transmission channel.

[0016] In one possible implementation:

[0017] The print head is provided with a plurality of transmission channels, and one print head includes a plurality of nozzles, the number of the nozzles is the same as the number of the transmission channels, one nozzle corresponds to one transmission channel, one transmission channel is connected to one consumable storage device, and the nozzle is configured to selectively extrude one or more consumables in the consumable storage device.

[0018] In one possible implementation:

[0019] The 3D printing device also includes multiple material cutting components, one of which corresponds to one of the nozzles. The material cutting component is configured to generate relative movement with the print head and enter the transmission channel corresponding to the material cutting component to cut off the consumable material in the transmission channel; wherein, two of the multiple nozzles are spaced apart, one of the material cutting components is located on one side of the two spaced apart nozzles, and the other of the material cutting components is located on the other side of the two spaced apart nozzles.

[0020] In one possible implementation:

[0021] The 3D printing device also includes a material cutting component, which is configured to produce relative displacement with the print head and enter the multiple transmission channels to simultaneously cut the consumables located in the multiple transmission channels.

[0022] In one possible implementation:

[0023] The 3D printing device also includes at least one first feed component, at least one first feed component is arranged between the print head and the consumable storage device, at least one first feed component is arranged one-to-one between at least one nozzle and at least one consumable storage device, the first feed component has an exhaust channel and at least one feed channel, the exhaust channel is configured to be connected to the nozzle, at least one feed channel is connected to the exhaust channel, at least one feed channel is configured to be connected to the consumable storage device, and at least one feed channel is configured to transmit at least one consumable in one-to-one correspondence.

[0024] In one possible implementation:

[0025] The 3D printing device also includes a buffer; the buffer is arranged between the print head and the consumable storage device, the buffer is provided with a buffer channel, the buffer channel is configured to transfer consumables between the consumable storage device and the nozzle, and the buffer is constructed to provide resistance to the consumables in the buffer channel against the consumable transportation; wherein, there is at least one buffer, each of the buffers is provided with a buffer channel, and at least one buffer channel is connected one-to-one between at least one consumable storage device and at least one nozzle; or, there is one buffer, the buffer is provided with at least one buffer channel, and at least one buffer channel is connected one-to-one between at least one consumable storage device and at least one nozzle.

[0026] In one possible implementation:

[0027] The print head includes a second extrusion component and at least one hot melt component, the second extrusion component defines an extrusion channel, the hot melt component defines a hot melt channel, and the hot melt channel is configured as a transmission channel when connected to the extrusion channel; wherein, the number of the second extrusion component is at least one, at least one second extrusion component is connected to at least one hot melt component in a one-to-one correspondence, and forms at least one transmission channel; or, the second extrusion component includes an active extrusion piece and at least one driven extrusion piece, at least one driven extrusion piece is connected to at least one hot melt component in a one-to-one correspondence, and the hot melt component is configured to drive the driven extrusion piece connected thereto to approach the active extrusion piece, so that the extrusion channel is formed between the driven extrusion piece and the driven extrusion piece, and the consumable material is transmitted; the hot melt component is also configured to drive the driven extrusion piece connected thereto away from the active extrusion piece, so that the active extrusion piece and the driven extrusion piece stop transmitting the consumable material. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic structural diagram of a 3D printing device according to an embodiment of the present application.

[0030] Figure 2 Schematic diagram of the structure of a consumable storage device according to an embodiment of the present application.

[0031] Figure 3 This is a structural schematic diagram of a consumable storage device according to another embodiment of the present application.

[0032] Figure 4 Schematic diagram of the structure of a buffer according to an embodiment of the present application.

[0033] Figure 5 FIG. 1 is a schematic structural diagram of a print head according to an embodiment of the present application.

[0034] Figure 6 Schematic diagram of the structure of a switching component and a print head according to an embodiment of the present application.

[0035] Figure 7 This is a structural diagram of a switching component and a print head according to another embodiment of the present application.

[0036] Figure 8 This is a structural diagram of a switching component and a print head according to another embodiment of the present application.

[0037] Figure 9 This is a schematic structural diagram of a print head according to another embodiment of the present application.

[0038] Figure 10 This is a schematic structural diagram of a print head and a material cutting assembly according to an embodiment of the present application.

[0039] Figure 11 This is a schematic structural diagram of a print head and a material cutting assembly according to another embodiment of the present application.

[0040] Figure 12 This is a schematic structural diagram of a print head and a material cutting assembly according to another embodiment of the present application.

[0041] Figure 13 This is a schematic structural diagram of a 3D printing device according to another embodiment of the present application.

[0042] Figure 14 This is a schematic structural diagram of the first feeding assembly according to an embodiment of the present application.

[0043] Figure 15 This is a schematic structural diagram of a 3D printing device according to another embodiment of the present application.

[0044] Figure 16 This is a schematic structural diagram of a 3D printing device according to another embodiment of the present application.

[0045] Description of main component symbols:

[0046]

[0047]

[0048] DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0050] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered therein. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an element centered therein. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be an element centered therein. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the relevant listed items.

[0052] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0053] The embodiments of this application are described using a first direction X, a second direction Y, and a third direction Z. The first direction X, the second direction Y, and the third direction Z are three non-parallel directions in a spatial coordinate system. In subsequent embodiments, the first direction X, the second direction Y, and the third direction Z are described as three mutually perpendicular reference directions in a three-dimensional Cartesian coordinate system. The directions shown in the embodiments of this application are intended to help understand the relative positional relationships of the various components, but do not limit their specific directions. The first direction X and the second direction Y are two perpendicular directions in a horizontal plane, and the third direction Z is a vertical direction.

[0054] In this embodiment, a plurality refers to two, three or more.

[0055] See also Figure 1 This embodiment provides a 3D printing device 400, including a frame 401, a print head 100, a buffer 300, an X-axis drive assembly 402, a Y-axis drive assembly 403, a Z-axis drive assembly 404, a molding platform 405, a base 406 and at least one consumable storage device 200.

[0056] In this embodiment, see Figure 1The frame 401 includes a crossbeam 4012 and two columns 4011. The two columns 4011 are spaced apart along a first direction X. The crossbeam 4012 is connected to the tops of the two columns 4011 and extends along the first direction X. At least one of the columns 4011 is provided with a Z-axis drive assembly 404. In some embodiments, the X-axis drive assembly 402 is connected between the two columns 4011 and is coupled to the Z-axis drive assembly 404 to enable movement in a third direction Z (e.g., ascending or descending in the third direction Z) driven by the Z-axis drive assembly 404. The print head 100 is coupled to the X-axis drive assembly 402 and is capable of movement in the first direction X driven by the X-axis drive assembly 402. A base 406 is disposed between the two columns 4011. A Y-axis drive assembly 403 is disposed on the base 406. The build platform 405 is coupled to the Y-axis drive assembly 403 and is capable of movement in a second direction Y driven by the Y-axis drive assembly 403. The forming platform 405 is used to carry and form the filament extruded by the print head 100. In other embodiments, the X-axis drive assembly 402 is connected between the two columns 4011, the Y-axis drive assembly 403 is connected to the X-axis drive assembly 402, and the print head 100 is connected to the Y-axis drive assembly 403, so that the X-axis drive assembly 402 and the Y-axis drive assembly 403 can jointly drive the print head 100 to move along the first direction X and the second direction Y. The base 406 is disposed between the two columns 4011, the Z-axis drive assembly 404 is disposed on the base 406, and the forming platform 405 is connected to the Z-axis drive assembly 404. Driven by the Z-axis drive assembly 404, the forming platform 405 can move toward or away from the print head 100 along the third direction Z. When the forming platform 405 approaches the print head 100, it is in an ascending state, and when the forming platform 405 moves away from the print head 100, it is in a descending state. In other embodiments, the Y-axis drive assembly 403 may be connected to the column 4011, the X-axis drive assembly 402 may be connected to the Y-axis drive assembly 403, and the print head 100 may be connected to the X-axis drive assembly 402, thereby enabling the print head 100 to move in the first direction X and the second direction Y. Alternatively, the X-axis drive assembly 402 and the Y-axis drive assembly 403 may be replaced with a bidirectional drive structure for the first direction X and the second direction Y. In other embodiments, the Y-axis drive assembly 403 may be connected to the Z-axis drive assembly 404, and the X-axis drive assembly 402 may be connected to the Y-axis drive assembly 403, thereby enabling the print head 100 to move in the first direction X, the second direction Y, and the third direction Z relative to the build platform 405.

[0057] In other embodiments, the frame 401 may be constructed in other structural forms, and the 3D printing device 400 may be constructed as a complete 3D printing device 400, a single cantilever 3D printing device 400, an infinite Z-axis 3D printing device 400, a delta 3D printing device 400, or other 3D printing devices 400. Therefore, there are many types of drive structures for achieving relative movement between the print head 100 and the molding platform 405, and this embodiment does not specifically limit them.

[0058] In this embodiment, the difference between one consumable and another consumable refers to the difference in physical properties between one consumable and another consumable. The physical properties can be various physical properties such as color and strength. In this embodiment, color is used as an example for explanation.

[0059] See also Figures 1 to 3 The print head 100 includes one or more nozzles 20. One or more consumable storage devices 200 each contain one or more consumables. A nozzle 20 is connected to each consumable storage device 200, and the nozzle 20 is configured to extrude the consumables within the consumable storage device 200. The beneficial effect of this application is to balance the printing accuracy of the 3D printing device 400 with the switching of different consumables, thereby achieving high-precision printing operations with multiple consumables.

[0060] According to the 3D printing device 400 of this embodiment, since the nozzle 20 of the print head 100 includes one or more nozzles 20, compared with increasing the number of nozzles 20 by setting multiple print heads 100, the weight of the print head 100 can be reduced, thereby reducing the load of the X-axis drive assembly 402, making the movement accuracy of the print head 100 higher and improving the molding quality of the molded part.

[0061] When it is necessary to switch consumables, if the number of nozzles 20 is only one, the consumables in the nozzle 20 can be returned to the consumables storage device 200, and then another consumable can be transferred to the nozzle 20 to achieve consumable switching. The new consumable can come from the current consumables storage device 200, or from another consumables storage device 200. In this switching mode, the number of nozzles 20 of the print head 100 decreases, which can further improve the movement accuracy of the print head 100; if the number of nozzles 20 is multiple, the consumable in the current nozzle 20 is returned to the current consumables storage device 200, and at the same time, another consumable in another consumables storage device 200 is transferred to another nozzle 20. In this switching mode, the return of the current nozzle 20 and the feeding of the other nozzle 20 can be carried out simultaneously, thereby improving the material replacement efficiency and thus improving the printing efficiency; in this way, reliable switching of consumables is achieved, and the printing quality is guaranteed or the printing efficiency is improved.

[0062] In some embodiments, see Figure 1The print head 100 is provided with at least one transmission channel Q1, which is connected one-to-one between at least one consumable storage device 200 and at least one nozzle 20. The transmission channel Q1 is configured to transmit any one consumable delivered by the corresponding consumable storage device 200 to the nozzle 20 and extrude the consumable through the nozzle 20. In some embodiments, the print head 100 is provided with multiple transmission channels Q1. A print head 100 includes multiple nozzles 20. The number of nozzles 20 is the same as the number of transmission channels Q1. One nozzle 20 corresponds to one transmission channel Q1. One transmission channel Q1 is connected to one consumable storage device 200. The nozzle 20 is configured to selectively extrude one or more consumables in the consumable storage device 200. In this way, it can be ensured that each nozzle 20 can extrude different consumables respectively, avoid the problem of mutual contamination of different consumables, and improve printing quality. In other embodiments, the number of transmission channels Q1 may also be different from the number of nozzles 20.

[0063] In some embodiments, see Figure 2 and Figure 3 The consumables storage device 200 includes at least one rack 201 and at least one first extrusion assembly 202. The rack 201 is configured to store a single type of consumable. The rack 201 can store consumables in a coiled form. The first extrusion assembly 202 corresponds one-to-one with the rack 201 and is used to extrude consumables into the transmission channel Q1 or push consumables back into the rack 201. This allows for storage of a variety of consumables and their delivery to the transmission channel Q1 of the printhead 100. The first extrusion assembly 202 also improves consumable replacement efficiency.

[0064] In some embodiments, there are multiple consumable storage devices 200, and the racks 201 of the multiple consumable storage devices 200 store a total of multiple consumables. In other embodiments, there is only one consumable storage device 200, and there are multiple racks 201, and the multiple racks 201 store a total of multiple consumables. In other embodiments, when there are multiple consumable storage devices 200, some of the consumable storage devices 200 may include multiple racks 201 and multiple first extrusion assemblies 202, while other consumable storage devices 200 may include one rack 201 and one first extrusion assembly 202. Therefore, there are many ways to achieve storage of multiple consumables, which are not specifically limited in this embodiment.

[0065] In some embodiments, the first extrusion assembly 202 may be configured as two feed wheels that rotate in opposite directions. The two feed wheels rotate in opposite directions to provide a conveying force for the consumables between the two feed wheels.

[0066] In some embodiments, see Figure 1 and Figure 4The buffer 300 is located between the print head 100 and the consumable storage device 200. The buffer 300 is provided with a buffer channel Q3, which is configured to transport consumables between the consumable storage device 200 and the transport channel Q1. The buffer 300 is constructed to provide resistance to the consumables in the buffer channel Q3. In this way, if the print head 100 or the consumable storage device 200 stops feeding consumables, resulting in uneven force on the consumables, the buffer 300 acts as a buffer, preventing the consumables from breaking due to stress changes, improving protection for the consumables, and ensuring smooth consumable replacement.

[0067] In some embodiments, see Figure 4 The buffer 300 includes a feed section 301, a buffer section 303, and a discharge section 302. The feed section 301 is connected to the consumables storage device 200 via a first feed tube 304 (see figure). The discharge section 302 is connected to the print head 100 via a second feed tube 305 (see figure). The first and second feed tubes 304, 305 can be constructed as Teflon tubes or other tubular structures. The buffer section 303 is connected between the feed section 301 and the discharge section 302. The buffer section 303 drives relative displacement between the feed section 301 and the discharge section 302 to cushion the forces acting on the consumables. The buffer section 303 can be constructed as an elastic element such as a spring, tension spring, or elastic column. The feed section 301 is provided with a first channel Q31, and the discharge section 302 is provided with a second channel Q32. The first channel Q31 and the second channel Q32 are connected to form the buffer channel Q3.

[0068] In some embodiments, there is at least one buffer 300, each buffer 300 having a buffer channel Q3, and at least one buffer channel Q3 is connected one-to-one between at least one consumable storage device 200 and at least one transmission channel Q1. In another embodiment, there is only one buffer 300, each buffer 300 having at least one buffer channel Q3, and at least one buffer channel Q3 is connected one-to-one between at least one consumable storage device 200 and at least one transmission channel Q1. In this way, each buffer channel Q3 is connected to a transmission channel Q1, thereby ensuring that the consumables transported by each transmission channel Q1 are buffered during the material reload process.

[0069] In other embodiments, the 3D printing device 400 may also include a display (not shown), a material guide unit (not shown), and other possible functional units in the 3D printing process. Their specific structure, working principle, connection relationship, position relationship, coordination relationship, etc. are not described in detail.

[0070] In some embodiments, see Figure 5The print head 100 includes a mounting bracket 81, at least one hot melt assembly 30, a second extrusion assembly 70, and a nozzle 20. The mounting bracket 81 is connected to the X-axis drive assembly 402. The hot melt assembly 30 is mounted on the mounting bracket 81. The second extrusion assembly 70 is mounted on the bracket. The nozzle 20 is connected to the side of the hot melt assembly 30 facing away from the second extrusion assembly 70.

[0071] The hot melt assembly 30 includes a first portion 31, a transition portion 32, and a second portion 33. The first portion 31 is connected to the mounting bracket 81, and the second portion 33 is connected to the first portion 31 via the transition portion 32. The first portion 31 can correspond to the main heat dissipation area of the hot melt assembly 30 (for example, the first portion 31 can be configured as a radiator having a plurality of heat dissipation fins), the second portion 33 can correspond to the main heating area of the hot melt assembly 30 (for example, the second portion 33 can be configured as a heater or a heating block), and the transition portion 32 can correspond to the throat area of the hot melt assembly 30 (for example, the transition portion 32 can be configured as a throat connected between the radiator and the heater). The first portion 31, the transition portion 32, and the second portion 33 together define a hot melt channel Q11, which forms part of the transmission channel Q1 so that the consumable material located in the hot melt channel Q11 is heated and melted. The nozzle 20 is connected to the second portion 33 to output the melted consumable material to the molding platform 405, thereby achieving extrusion molding and completing printing.

[0072] Please continue to see Figure 5 , along the conveying direction of the consumables in the transmission channel Q1 (when the 3D printing device 400 is working, the conveying direction is generally the third direction Z), the second extrusion assembly 70 is located upstream of the hot melt assembly 30. The second extrusion assembly 70 includes an active extruder 71 and a driven extruder 72. The active extruder 71 and the driven extruder 72 cooperate to define the extrusion channel Q12. The active extruder 71 and the driven extruder 72 move toward each other to apply a force to the consumables in the extrusion channel Q12 to move close to the hot melt channel Q11, thereby advancing the consumables, wherein the extrusion channel Q12 constitutes the transmission channel Q1 when connected to the hot melt channel Q11. When the consumables need to be replaced and the material is withdrawn, the active extruder 71 and the driven extruder 72 are controlled to switch to rotate in opposite directions, thereby applying a force to the consumables in the extrusion channel Q12 to move away from the hot melt channel Q11, thereby realizing the withdrawal of the consumables.

[0073] In some embodiments, see Figure 5The active extruder 71 is the active extrusion wheel, and the driven extruder 72 is the driven extrusion wheel. The second extrusion assembly 70 also includes an extrusion drive (not shown in the figure), which is connected to the active extrusion wheel and is configured to drive the active extrusion wheel to rotate. The active extrusion wheel and the driven extrusion wheel are engaged through a transmission gear, thereby achieving the opposite movement between the active extrusion wheel and the driven extrusion wheel.

[0074] In some embodiments, see Figure 6 The print head 100 includes at least one hot melt assembly 30, which defines a hot melt channel Q11. The hot melt assembly 30 is connected to the nozzle 20, and the hot melt channel Q11 is in communication with the nozzle 20. The at least one hot melt assembly 30 has a printing position and a standby position. In the printing position, the hot melt assembly 30 extrudes the consumable material, and in the standby position, the hot melt assembly 30 stops extruding the consumable material. The 3D printing device 400 also includes a switching assembly 40, which is configured to selectively arrange each hot melt assembly 30 in the printing position or the standby position, wherein the height of the nozzle 20 connected to the hot melt assembly 30 in the printing position is lower than the height of the nozzle 20 connected to the hot melt assembly 30 in the standby position.

[0075] In this way, only one hot melt assembly 30 is in the printing position at any one time, and the hot melt assembly 30 in the standby position does not affect the extrusion action of the hot melt assembly 30 in the printing position, thereby ensuring smooth printing and improving print quality. Furthermore, since each hot melt assembly 30 is connected to a different consumable, when switching consumables during multi-color printing, the position of the hot melt assembly 30 can be directly switched using the switching assembly 40, enabling printing with the changed consumables. This improves printing efficiency and, since there is no need to replace consumables, reduces the risk of contamination from different consumables, further improving print quality.

[0076] In some embodiments, see Figure 7 The switching assembly 40 includes a switching drive 41 and a transmission 42. The switching drive 41 is connected to the transmission 42, which is in transmission connection with at least one hot melt assembly 30 and is configured to drive the at least one hot melt assembly 30 to switch between the printing position and the standby position under the drive of the switching drive 41. The switching drive 41 can be configured as a drive structure such as a motor.

[0077] In other embodiments, see Figure 8The switching assembly 40 includes a transmission member 42, which is configured to abut each hot melt assembly 30. When triggered, the transmission member 42 is configured to drive at least one hot melt assembly 30 to switch between the printing position and the standby position. There are many ways to trigger the transmission member 42. For example, the print head 100 can be driven by the X-axis drive assembly 402 to approach the frame 401, and relative movement is generated between the transmission member 42 and the frame 401. While the transmission member 42 moves, it can drive at least one hot melt assembly 30 to move, so that the hot melt assembly 30 currently in the printing position switches to the standby position, and the other hot melt assembly 30 in the standby position switches to the printing position, thereby achieving the switching of the hot melt assemblies 30. In this way, the position switching of the hot melt assembly 30 can be achieved by mechanical collision, without the need for additional drive structures such as motors, thereby reducing the weight of the print head 100 and improving the movement accuracy and printing quality of the print head 100.

[0078] In some embodiments, see Figure 8 The transmission member 42 is provided with an abutment portion 43 that protrudes downward along the third direction Z. The transmission member 42 is capable of moving under the drive of the switching drive member 41 and sequentially contacting at least one hot melt assembly 30. The abutment portion 43 is capable of pushing the hot melt assembly 30 it contacts downward along the third direction Z, while the positions of the other hot melt assemblies 30 in the third direction Z remain unchanged. In this way, the hot melt assembly 30 contacting the abutment portion 43 enters the printing position, while the other hot melt assemblies 30 remain in the standby position. As a result, the printing action of the hot melt assembly 30 in the printing position will not be interfered with by the hot melt assembly 30 in the standby position, thereby ensuring the printing quality of the 3D printing device 400.

[0079] In some embodiments, see Figure 8 When multiple hot melt components 30 are distributed in sequence along the first direction X, the transmission member 42 can be constructed as a long strip structure, and move along the first direction X under the drive of the switching drive member 41, or move along the first direction X relative to the multiple hot melt components 30 after hitting the column 4011.

[0080] In another embodiment, see Figure 7 The transmission member 42 can be constructed as a disc-shaped structure, and rotates around the rotation axis under the drive of the switching drive member 41, and the rotation axis is parallel to the third direction Z, or rotates around the rotation axis after the swing arm hits the column 4011, wherein multiple hot melt components 30 are located on the projection of the rotation path of the top part 43 along the third direction Z.

[0081] Therefore, there are many ways for the transmission member 42 to push the multiple hot melt components 30 to switch positions, which are not specifically limited in this embodiment.

[0082] In some embodiments, the switch assembly 40 can be connected to the mounting bracket 81. In other embodiments, the switch assembly 40 can also be mounted on the rack 401.

[0083] In another embodiment, see Figure 9 The print head 100 is provided with a hot melt assembly 30. The hot melt assembly 30 has multiple hot melt channels Q11. Each of the multiple hot melt channels Q11 can input a type of consumable. The multiple hot melt channels Q11 can be connected to a second feed pipe 305 through an extrusion channel Q12. The multiple hot melt channels Q11 are spaced apart from each other (for example, the multiple hot melt channels Q11 can be distributed around a center of a circle). The print head 100 also includes a nozzle mounting member 34. The nozzle mounting member 34 is located on one side of the outlet of the hot melt assembly 30 along the hot melt channel Q11. The nozzle 20 is connected to the nozzle mounting member 34. There is one nozzle 20. The nozzle mounting member 34 can be connected to the mounting bracket 81 of the print head 100 via a rotating shaft (for example, the axis of the rotating shaft coincides with the aforementioned center of the circle). When the nozzle mounting member 34 rotates until the nozzle 20 is connected to one of the hot melt channels Q11, the consumable in the hot melt channel Q11 can be extruded from the nozzle 20 after melting for printing. When it is necessary to replace consumables, the nozzle mounting member 34 is controlled to rotate so that the nozzle 20 is connected to another hot melt channel Q11, and the consumables in the other channel can be squeezed out, thus completing the consumable switching. Therefore, in this embodiment, the number of nozzles 20 and the number of transmission channels Q1 do not need to be strictly one-to-one corresponding.

[0084] In some embodiments, see Figure 9 The second extrusion assembly 70 includes an active extrusion piece 71 and at least one driven extrusion piece 72. The at least one driven extrusion piece 72 is connected to at least one hot melt assembly 30 in a one-to-one correspondence. The hot melt assembly 30 is configured to drive the driven extrusion piece 72 connected thereto to approach the active extrusion piece 71, so that an extrusion channel Q12 is formed between the driven extrusion piece 72 and the driven extrusion piece 72, and the consumables are transmitted; the hot melt assembly 30 is also configured to drive the driven extrusion piece 72 connected thereto away from the active extrusion piece 71, so that the active extrusion piece 71 and the driven extrusion piece 72 stop transmitting the consumables.

[0085] In this way, a single active extruder 71 can complete the extrusion of consumables from multiple extrusion channels Q12, further reducing the weight of the printhead 100 and improving printing precision and quality while meeting the requirements of switching printing with multiple consumables. Furthermore, this embodiment further reduces the weight of the printhead 100 and improves the movement precision of the printhead 100, thereby improving printing quality.

[0086] The driven extruder 72 connected to the hot melt assembly 30 in the printing position is positioned close to the active extruder 71, forming an extrusion channel Q12. The driven extruder 72 connected to the hot melt assembly 30 in the standby position is moved away from the active extruder 71 to stop extruding consumables. Synchronizing the position switching of the hot melt assembly 30 and the driven extruder 72 reduces switching difficulty and improves switching efficiency.

[0087] In some embodiments, see Figure 9 The second extrusion assembly 70 includes an extrusion bracket 75, a fixed bracket 73, and a plurality of movable brackets 74. The extrusion bracket 75 is connected to the mounting bracket 81. The fixed bracket 73 is provided on the extrusion bracket 75. In some embodiments, the mounting bracket 81, the fixed bracket 73, and the extrusion bracket 75 can be constructed as an integrally formed structure to improve the structural stability of the print head 100. The active extruder 71 is rotatably provided on the fixed bracket 73. The number of movable brackets 74, the number of driven extruders 72, and the number of hot melt assemblies 30 are the same. Each driven extruder 72 is rotatably connected to a movable bracket 74. Each movable bracket 74 is connected to each hot melt assembly 30. In this way, when the hot melt assembly 30 is switched to the standby position under the drive of the switching assembly 40, the movable bracket 74 connected to the hot melt assembly 30 also moves synchronously, and the driven extruder 72 on the movable bracket 74 moves away from the active extruder 71. For example, an extrusion channel Q12 is formed between the driven extrusion piece 72 and the active extrusion piece 71 on the left side of the figure, and the driven extrusion piece 72 and the active extrusion piece 71 on the right side of the figure are staggered along the third direction Z.

[0088] In other embodiments, see Figure 8 , there is at least one second extrusion assembly 70, and at least one second extrusion assembly 70 is connected to at least one hot melt assembly 30 in a one-to-one correspondence, forming at least one transmission channel Q1. This facilitates the independent transportation of various consumables within different transmission channels Q1, improving the reliability of consumable transportation. Furthermore, in such an embodiment, the switching assembly 40 can simultaneously drive the movement of the second extrusion assembly 70 by pushing the hot melt assembly 30, or the switching assembly 40 can only drive the movement of the second extrusion assembly 70.

[0089] In another embodiment, see Figure 6There is only one second extrusion assembly 70, and at least one hot melt assembly 30 has a standby position and a printing position. The extrusion channel Q12 of the hot melt assembly 30 in the printing position is connected to the hot melt channel Q11, while the extrusion channel Q12 of the hot melt assembly 30 in the standby position is staggered from the hot melt channel Q11. In this way, a single second extrusion assembly 70 can meet the different consumable material delivery requirements of multiple hot melt assemblies 30, thereby reducing the overall weight of the printhead 100 and improving the movement accuracy of the printhead 100, meeting the printing requirements of multiple consumables while ensuring print quality. At least one hot melt assembly 30 can also achieve position switching driven by the aforementioned switching assembly 40, which will not be further described here.

[0090] There are multiple ways to switch the position of at least one hot melt assembly 30. For example, at least one hot melt assembly 30 can move linearly relative to the second extrusion assembly 70. The hot melt assembly 30 corresponding to the second extrusion assembly 70 along the third direction Z is switched to the printing position, and the extrusion channel Q12 of the hot melt assembly 30 is connected to the hot melt channel Q11 along the third direction Z. The extrusion channel Q12 of the hot melt assembly 30 in the standby position is staggered from the hot melt channel Q11 along the third direction Z. Alternatively, at least one hot melt assembly 30 can move in a circumferential direction, rotating to the hot melt assembly 30 corresponding to the second extrusion assembly 70 along the third direction Z. The hot melt assembly 30 switches to the printing position, and the extrusion channel Q12 of the hot melt assembly 30 is connected to the hot melt channel Q11 along the third direction Z. The extrusion channel Q12 of the hot melt assembly 30 in the standby position is staggered from the hot melt channel Q11 along the third direction Z.

[0091] Therefore, in this embodiment, the number of hot melt components 30, the number of second extrusion components 70, and the matching relationship between the hot melt components 30 and the second extrusion components 70 can be adjusted according to actual needs.

[0092] In some embodiments, see again Figure 4 The 3D printing device 400 also includes a material cutting assembly 50. The material cutting assembly 50 is movably connected to the print head 100. When triggered, the material cutting assembly 50 is configured to move relative to the print head 100 and enter at least one transmission channel Q1 to cut off the consumables in the transmission channel Q1. In this way, when it is necessary to switch between different consumables to complete printing, the user can use the material cutting assembly 50 to cut off the consumables and then transfer another consumable in the consumable storage device 200 to the transmission channel Q1 to achieve the consumable switching.

[0093] In some embodiments, see Figure 4, along the conveying direction of the consumables in the transmission channel Q1, the cutting component 50 is arranged between the second extrusion component 70 and the hot melt component 30. In this way, the second extrusion component 70 can be easily rotated in the opposite direction, and the current consumables can leave the extrusion channel Q12 of the second extrusion component 70, and the consumables storage device 200 can then drive the new consumables into the extrusion channel Q12 of the second extrusion component 70. In this way, it is possible to ensure the replacement efficiency of consumables and reduce the waste of consumables. In other embodiments, the position of the cutting component 50 can also be set on the side of the second extrusion component 70 away from the hot melt component 30, or at the outlet of the consumables storage device 200.

[0094] In some embodiments, the material cutter assembly 50 is movably connected to the mounting bracket 81 of the printhead 100. When triggered, the material cutter assembly 50 is configured to move relative to the printhead 100 and enter at least one transfer channel Q1 to cut the consumables within the transfer channel Q1. This ensures that the material cutting action of the material cutter assembly 50 does not affect other operations of the printhead 100 (such as the replacement of consumables in other transfer channels Q1), thereby improving printing efficiency.

[0095] In some embodiments, see Figure 4 , the material cutting assembly 50 includes a material cutting drive 51, a mounting seat 52 and a blade 53. The blade 53 is connected to the mounting seat 52. The material cutting drive 51 is configured to drive the mounting seat 52 to move relative to the mounting bracket 81 so that the blade 53 enters the transmission channel Q1 and cuts the consumables. The material cutting drive 51 can be fixedly connected to the mounting seat 52, so that the material cutting drive 51 can drive the mounting seat 52 to move in a straight line (for example, move along the first direction X) and drive the blade 53 to move in a straight line into the transmission channel Q1. The material cutting drive 51 can be hingedly connected to the mounting seat 52, so that the material cutting drive 51 can drive the mounting seat 52 to rotate and screw the blade 53 into the transmission channel Q1.

[0096] In some embodiments, see Figure 10 , the material cutting component 50 is configured to move relative to the print head 100 when triggered, and enter the transmission channel Q1 to cut the consumables located in the transmission channel Q1. And / or, the print head 100 is configured to move relative to the material cutting component 50 when triggered, so that the material cutting component 50 enters the transmission channel Q1 and cuts the consumables located in the transmission channel Q1. For example, the material cutting drive 51 is a motor and is mounted on the mounting bracket 81 or the frame 401. The material cutting drive 51 is fixedly connected to the mounting seat 52 to drive the mounting seat 52 to move. The mounting seat 52 can be fixedly connected to the mounting bracket 81 or the column 4011 of the frame 401. For another example, Figure 11In the illustrated embodiment, the cutting drive 51 of the cutting assembly 50 is fixed to the mounting bracket 81. The cutting drive 51 can drive the hot melt assembly 30 to move linearly or rotationally and approach the blade 53 of the mounting seat 52 until the blade 53 enters the transmission channel Q1 to cut the consumable material.

[0097] In other embodiments, the material-cutting drive member 51 can be driven by other power to move the mounting base 52, thereby being triggered. For example, the material-cutting drive member 51 can be constructed to be hingedly connected to the mounting bracket 81 or the frame 401. When the print head 100 approaches the frame 401 along the first direction X, the print head 100 and the material-cutting drive member 51 produce relative motion, so that the material-cutting drive member 51 drives the mounting base 52 to move, thereby causing the blade 53 to extend into the transmission channel Q1. In other embodiments, the material-cutting drive member 51 can also drive the mounting base 52 to achieve a compound motion of linear movement and rotation, for example, a compound motion of movement and rotation within a plane formed by the first direction X and the second direction Y, or for example, a compound motion of movement and rotation within a plane formed by the first direction X and the third direction Z. The compound motion formed by movement and rotation can more finely regulate the motion trajectory of the material-cutting drive member 51 in space, thereby avoiding interference from other components, and helping to arrange the material-cutting assembly 50 in a small space, making the overall structure more compact.

[0098] In some embodiments, see Figure 10 , the material cutting component 50 is configured to produce relative displacement with the print head 100 and enter into multiple transmission channels Q1 to simultaneously cut the consumables located in the multiple transmission channels Q1. In this way, the efficiency of the material cutting component 50 in cutting off the consumables in the multiple transmission channels Q1 can be improved, thereby improving the material replacement efficiency. Specifically, the number of transmission channels Q1 is multiple, and the multiple transmission channels Q1 are spaced apart on the print head 100. There are two material cutting components 50, and the two material cutting components 50 are located on opposite sides of the print head 100 along the first direction X. One of the material cutting components 50 is configured to cut off the consumables in the multiple transmission channels Q1 on one side of the print head 100 along the first direction X, and the other material cutting component 50 is configured to cut off the consumables in the multiple transmission channels Q1 on the other side of the print head 100 along the first direction X. For example, Figure 10 In the illustrated embodiment, the material cutting assembly 50 is disposed along a first direction X on one side of two print heads 100 distributed along the first direction X. As a result, the blade 53 of the material cutting assembly 50 can simultaneously extend into the transmission channels Q1 of at least two adjacent print heads 100 in the second direction Y. Thus, the material cutting assembly 50 can simultaneously cut consumables in both transmission channels Q1, thereby improving consumable cutting and replacement efficiency, and thus improving printing efficiency.

[0099] In some embodiments, see Figure 10 and Figure 12 The print head 100 includes a first transmission channel group Q4 and a second transmission channel group Q5, which are spaced apart along a first direction X. The first transmission channel group Q4 includes at least one transmission channel Q1, and the second transmission channel group Q5 includes at least one transmission channel Q1. The 3D printing device 400 includes a first material cutting assembly 50a and a second material cutting assembly 50b. The first material cutting assembly 50a is located on the side of the first transmission channel group Q4 that faces away from the second transmission channel group Q5 along the first direction X. The first material cutting assembly 50a is configured to enter at least one transmission channel Q1 of the first transmission channel group Q4 to cut the consumables within the transmission channel Q1. The second material cutting assembly 50b is located on the side of the second transmission channel group Q5 that faces away from the first transmission channel group Q4 along the first direction X. The second material cutting assembly 50b is configured to enter at least one transmission channel Q1 of the second transmission channel group Q5 to cut the consumables within the transmission channel Q1. In this way, the efficiency of consumable cutting and material replacement can be further improved.

[0100] The first material cutting assembly 50a is configured to be triggered so that, driven by the print head 100, it approaches and strikes a proximate post 4011, causing the material cutting drive 51 to rotate relative to the mounting bracket 81 and drive the mounting base 52 and the blade 53 to enter a portion of the transmission channel Q1 within the print head 100 to cut the consumables within the transmission channel Q1. The second material cutting assembly 50b is configured to be triggered so that, driven by the print head 100, it approaches and strikes another proximate post 4011, causing the material cutting drive 51 to rotate relative to the mounting bracket 81 and drive the mounting base 52 and the blade 53 to enter another portion of the transmission channel Q1 within the print head 100 to cut the consumables within the transmission channel Q1. In this way, when the print head 100 is provided with multiple transmission channels Q1, the two material cutting assemblies 50 can be used to cut the consumables within multiple transmission channels Q1 within the print head 100, thereby reducing material cutting costs and improving material cutting efficiency.

[0101] In other embodiments, the first cutting assembly 50a and the second cutting assembly 50b can both enter the transmission channel Q1 and cut the consumables under the drive of their own cutting driving members 51.

[0102] In some embodiments, see Figure 11The 3D printing device 400 also includes multiple material-cutting assemblies 50, one corresponding to each nozzle 20. The material-cutting assembly 50 is configured to move relative to the print head 100 and enter the transmission channel Q1 corresponding to the material-cutting assembly 50 to cut the consumables within the transmission channel Q1. Two of the multiple nozzles 20 are spaced apart, with one material-cutting assembly 50 located on one side of the two spaced-apart nozzles 20 and the other located on the other side of the two spaced-apart nozzles 20. This allows the consumables within the transmission channel Q1 corresponding to each nozzle 20 to be driven and cut by an independent material-cutting assembly 50. Furthermore, arranging multiple nozzles 20 on both sides of the print head 100 can improve the utilization of the side space of the print head 100 and increase the integration of the print head 100.

[0103] In some embodiments, please refer again to Figure 10 and Figure 11 The heat dissipation assembly 62 is mounted on the mounting bracket 81 and is configured to correspond to the first portion 31 and the transition portion 32 to promptly cool the first portion 31 and the transition portion 32, thereby reducing the risk of consumables melting and clogging within the first portion 31 and the transition portion 32. The heat dissipation assembly 62 can be configured with various heat dissipation structures, such as a heat dissipation fan, heat dissipation fins, or a water-cooled heat dissipation structure.

[0104] In some embodiments, the heat dissipation assembly 62 is disposed adjacent to at least one hot melt assembly 30. Alternatively, the heat dissipation assembly 62 is disposed adjacent to a single hot melt assembly 30. For example, referring to the figure, on one side of the mounting bracket 81 in the second direction Y, one heat dissipation assembly 62 is disposed adjacent to two hot melt assemblies 30 in the first direction X. This dissipates heat from both hot melt assemblies 30, reduces the weight of the printhead 100, and improves the movement accuracy of the printhead 100. On the other side of the mounting bracket 81 in the second direction Y, another two heat dissipation assemblies 62 are disposed adjacent to two hot melt assemblies 30 in the first direction X. In other embodiments, the heat dissipation assembly 62 may be disposed adjacent to three or more hot melt assemblies 30 simultaneously.

[0105] In some embodiments, see Figure 13The 3D printing device 400 also includes at least one first feed component 61, which is arranged between the print head 100 and the consumable storage device 200. The at least one first feed component 61 is arranged one-to-one between at least one transmission channel Q1 and at least one consumable storage device 200. The first feed component 61 opens a discharge channel Q21 and at least one feed channel Q22. The discharge channel Q21 is configured to be connected to the transmission channel Q1, and at least one feed channel Q22 is connected to the discharge channel Q21. The at least one feed channel Q22 is configured to be connected to the consumable storage device 200, and the at least one feed channel Q22 is configured to transmit at least one consumable in a one-to-one correspondence. In this way, one of multiple different consumables can be delivered to the discharge channel Q21 through at least one feed channel Q22. When it is necessary to switch consumables, the current consumable is withdrawn from the current feed channel Q22, leaving the discharge channel Q21 empty. Then, the first extrusion assembly 202 delivers another consumable to the other feed channel Q22 and into the discharge channel Q21, completing the switching of consumables. Furthermore, when multiple consumables are being delivered, the weight of the printhead 100 can be further reduced, the movement accuracy of the printhead 100 can be improved, and print quality can be enhanced.

[0106] When there is only one feed channel Q22, there are multiple first feed assemblies 61, each of which defines a feed channel Q2, and each feed channel Q2 is connected to a transmission channel Q1. This allows for separate delivery of consumables, reduces the possibility of contamination from mutual influence between consumables, and thus improves printing quality.

[0107] In some embodiments, the number of the first feeding assemblies 61 is the same as the number of the transmission channels Q1 , and each first feeding assembly 61 is disposed at the inlet of one transmission channel Q1 .

[0108] In some embodiments, the number of first feed assemblies 61 is equal to the number of buffers 300. The discharge portion 302 of each buffer 300 is connected to a first feed assembly 61 via a second feed tube 305. The feed channel Q2 of the first feed assembly 61 has a feed port K1 and a discharge port K2. The feed port K1 is connected to the second feed tube 305. The discharge port K2 is connected to the transmission channel Q1. This ensures reliable guidance of each consumable.

[0109] In some embodiments, there is one buffer 300. The buffer 300 is provided with multiple feeding portions 301 and multiple discharging portions 302. In this way, the buffer 300 can simultaneously buffer the transmission of multiple consumables. The number of the first feeding assembly 61 is one.

[0110] See also Figure 14 and Figure 15The feeding channel Q2 of the first feeding assembly 61 includes a discharge channel Q21 and multiple feeding channels Q22. The multiple feeding channels Q22 are respectively used to transport consumables. The multiple feeding channels Q22 define multiple feeding ports K1. The discharge channel Q21 defines the discharge port K2. The feeding port K1 and the multiple feeding channels Q22 are all connected to the discharge channel Q21, and the discharge channel Q21 is connected to a transmission channel Q1. The number of feeding parts 301, the number of discharge parts 302, the number of feeding channels Q22 and the number of second feeding pipes 305 are the same. Each discharge part 302 is connected to a feeding channel Q22 through a second feeding pipe 305 to transport different consumables into the first feeding assembly 61. When it is necessary to switch consumables, the consumables switched to other second feeding pipes 305 are transported to the feeding channel Q22, and then transported to the transmission channel Q1 through the discharge channel Q21. In this way, the plurality of buffers 300 can provide reliable buffering effects for the plurality of consumables.

[0111] In other embodiments, the first feeding assembly 61 may further be provided with two discharge channels Q21 , wherein the two discharge channels Q21 are respectively connected to at least one feeding channel Q22 .

[0112] In another embodiment, see Figure 16 , the 3D printing device 400 does not need to be provided with the first feed assembly 61. The 3D printing device 400 also includes a second feed assembly 64. The second feed assembly 64 is arranged between the buffer 300 and the consumable material storage device 200. At the same time, the buffer 300 includes a feed portion 301 and a buffer portion 303. The buffer 300 is connected to a transmission channel Q1 of the print head 100 through a second feed tube 305. The second feed assembly 64 can be connected to the consumable material storage device 200 through one or more first feed tubes 304. The structure and quantity of the second feed assembly 64 can be set with reference to the structure of the first extrusion assembly 202 and will not be repeated here.

[0113] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A 3D printing device, characterized in that: include: a print head, the print head comprising one or more nozzles; One or more consumable storage devices, each containing one or more consumables, one nozzle connected to one of the consumable storage devices, the nozzle being configured to extrude the consumables in the consumable storage device into shape; The print head includes at least one hot melt assembly, the hot melt assembly defining a hot melt channel, the hot melt assembly being connected to the nozzle, the hot melt channel being in communication with the nozzle, at least one of the hot melt assemblies having a printing position and a standby position, wherein the hot melt assembly extrude the consumable material in the printing position and the hot melt assembly stops extruding the consumable material in the standby position; The 3D printing device further includes a switching component configured to selectively arrange each of the hot melt assemblies in the printing position or the standby position, wherein a height of the nozzle connected to the hot melt assembly in the printing position is lower than a height of the nozzle connected to the hot melt assembly in the standby position; The switching assembly includes a switching drive member and a transmission member, wherein the switching drive member is connected to the transmission member, and the transmission member is transmission-connected to at least one of the hot melt assemblies and is configured to drive at least one of the hot melt assemblies to switch between the printing position and the standby position under the drive of the switching drive member; and / or, The switching assembly includes a transmission member, which is configured to abut against each of the hot melt assemblies. The transmission member is configured to drive at least one of the hot melt assemblies to switch between the printing position and the standby position when triggered.

2. The 3D printing device according to claim 1, characterized in that: The consumable storage device includes at least one material rack and at least one first extrusion assembly, the material rack is configured to store the consumable; the first extrusion assembly corresponds to the material rack one-to-one, and the first extrusion assembly is used to extrude the consumable to the nozzle, or push the consumable back to the material rack.

3. The 3D printing device according to claim 1, wherein: The print head is further provided with a transmission channel, the transmission channel being in communication with the nozzle, the transmission channel being configured to transmit the consumables between the nozzle and the consumables storage device; The 3D printing device also includes a material cutting component, which is movably connected to the print head. The material cutting component is configured to move relative to the print head when triggered and enter at least one of the transmission channels to cut off the consumables in the transmission channel.

4. The 3D printing device according to claim 1, wherein: The print head includes a first transmission channel group and a second transmission channel group, the first transmission channel group and the second transmission channel group are spaced apart along a first direction, the first transmission channel group includes at least one transmission channel, and the second transmission channel group includes at least one transmission channel; The 3D printing device includes a first material cutting component and a second material cutting component; The first material cutting component is located on a side of the first transmission channel component away from the second transmission channel group along a first direction, and the first material cutting component is configured to enter at least one transmission channel of the first transmission channel group to cut off the consumables in the transmission channel; The second material cutting component is located on a side of the second transmission channel group away from the first transmission channel group along the first direction, and the second material cutting component is configured to enter at least one of the transmission channels of the second transmission channel group to cut off the consumables in the transmission channel.

5. The 3D printing device according to claim 1, characterized in that: The print head is provided with a plurality of transmission channels, and one print head includes a plurality of nozzles, the number of the nozzles is the same as the number of the transmission channels, one nozzle corresponds to one transmission channel, one transmission channel is connected to one consumable storage device, and the nozzle is configured to selectively extrude one or more consumables in the consumable storage device.

6. The 3D printing device according to claim 5, characterized in that: The 3D printing device also includes multiple material cutting components, one of which corresponds to one of the nozzles. The material cutting component is configured to generate relative movement with the print head and enter the transmission channel corresponding to the material cutting component to cut off the consumable material in the transmission channel; wherein, two of the multiple nozzles are spaced apart, one of the material cutting components is located on one side of the two spaced apart nozzles, and the other of the material cutting components is located on the other side of the two spaced apart nozzles.

7. The 3D printing device according to claim 5, characterized in that: The 3D printing device also includes a material cutting component, which is configured to produce relative displacement with the print head and enter the multiple transmission channels to simultaneously cut the consumables located in the multiple transmission channels.

8. The 3D printing device according to claim 1, wherein: The 3D printing device also includes at least one first feed component, at least one first feed component is arranged between the print head and the consumable storage device, at least one first feed component is arranged one-to-one between at least one nozzle and at least one consumable storage device, the first feed component has an exhaust channel and at least one feed channel, the exhaust channel is configured to be connected to the nozzle, at least one feed channel is connected to the exhaust channel, at least one feed channel is configured to be connected to the consumable storage device, and at least one feed channel is configured to transmit at least one consumable in one-to-one correspondence.

9. The 3D printing device according to claim 1, characterized in that: The 3D printing device further includes a buffer; The buffer is provided between the print head and the consumable material storage device, and the buffer is provided with a buffer channel, the buffer channel is configured to transfer consumable material between the consumable material storage device and the nozzle, and the buffer is configured to provide resistance to the consumable material in the buffer channel against the consumable material conveying; wherein, There is at least one buffer, each buffer is provided with a buffer channel, and at least one buffer channel is connected one-to-one between at least one consumable material storage device and at least one nozzle; or The number of the buffer is one, and the buffer is provided with at least one buffer channel, and the at least one buffer channel is connected one-to-one between at least one consumable material storage device and at least one nozzle.

10. The 3D printing device according to claim 1, characterized in that: The print head includes a second extrusion component and at least one hot melt component, the second extrusion component defines an extrusion channel, the hot melt component defines a hot melt channel, and the hot melt channel is configured as a transmission channel when connected to the extrusion channel; wherein, The number of the second extrusion assembly is at least one, and at least one second extrusion assembly is connected to at least one hot melt assembly in a one-to-one correspondence to form at least one transmission channel; or, The second extrusion assembly includes an active extrusion piece and at least one driven extrusion piece, at least one driven extrusion piece is connected to at least one hot melt assembly in a one-to-one correspondence, and the hot melt assembly is configured to drive the driven extrusion piece connected thereto to approach the active extrusion piece, so that the extrusion channel is formed between the driven extrusion piece and the driven extrusion piece, and the consumable material is transmitted; the hot melt assembly is also configured to drive the driven extrusion piece connected thereto away from the active extrusion piece, so that the active extrusion piece and the driven extrusion piece stop transmitting the consumable material.

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