Multifunctional nozzle device for 3D direct-writing printing

Abstract

The 3D direct-writing printing multifunctional sprayer device comprises a shell, an extrusion screw, a driving unit and a connecting assembly, an inner cavity is formed in the middle of the shell, a feeding port is formed in the top of the shell, a nozzle is arranged at the bottom of the shell, and the feeding port and the nozzle both communicate with the inner cavity; the extrusion screw rod is mounted in the inner cavity, a bulge is arranged on the inner wall of the shell in a manner of protruding towards the extrusion screw rod, and the bulge is pyramid-shaped; the driving unit is used for driving the extrusion screw to rotate in the inner cavity; the connecting assembly is used for connecting the driving unit and the extrusion screw. According to the technical scheme, the pyramid-shaped bulges are arranged, and the pyramid-shaped bulges are provided with a plurality of inclined surfaces, so that materials can be cut from different angles, multi-directional vortexes are generated, material flowing is more effectively broken, mixing is more uniform, and the mixing effect of the materials is improved.

Description

Technical Field

[0001] The present invention relates to the field of 3D direct writing printing, and in particular to a 3D direct writing printing multifunctional nozzle device. Background Art

[0002] 3D direct ink writing (DIW) is an additive manufacturing technology that builds three-dimensional structures layer by layer by precisely controlling the extrusion and deposition of highly viscous elastic materials. Its core feature is the use of functional "ink" (such as ceramic slurry, hydrogel, conductive material, etc.) to directly write and shape, without the need for external forces such as photocuring or high-temperature sintering, and is suitable for complex geometric structures and multi-material integration.

[0003] The screw of the existing 3D direct writing printing nozzle device is generally used to mix multiple materials. The screw rotates and mixes the multiple materials under the drive of the motor. However, the mixing effect is only effective when the screw rotates and mixes. Summary of the invention

[0004] To this end, it is necessary to provide a 3D direct writing printing multifunctional nozzle device to solve the technical problem that the existing 3D direct writing printing nozzle device only relies on screw rotation for mixing and has an effective mixing effect.

[0005] To achieve the above object, the present invention provides a 3D direct writing printing multifunctional nozzle device, comprising:

[0006] The shell has an inner cavity in the middle, a feed port is provided at the top of the shell, and a nozzle is provided at the bottom of the shell, and the feed port and the nozzle are both connected to the inner cavity;

[0007] An extrusion screw is installed in the inner cavity, and an inner wall of the shell is provided with a protrusion protruding toward the extrusion screw, and the protrusion is in a pyramid shape;

[0008] A driving unit, the driving unit is used to drive the extrusion screw to rotate in the inner cavity;

[0009] A connecting assembly is used to connect the drive unit and the extrusion screw.

[0010] As an embodiment of the present invention, the connecting assembly includes an inner quick plug, an outer rotary joint and a fastener, the inner quick plug is used to connect the drive unit and the extrusion screw, the outer rotary joint is sleeved outside the inner quick plug, and the two ends of the outer rotary joint are respectively connected to the top of the shell and the bearing seat of the drive unit through fasteners.

[0011] As an embodiment of the present invention, the outer surface of the top of the extrusion screw has two first slots opposite to each other in the horizontal direction, and the outer surface of the output shaft of the driving unit has two second slots opposite to each other in the horizontal direction;

[0012] The inner quick plug includes a quick plug body and two or more groups of clamping components. The quick plug body has a cavity inside. The quick plug body is provided with two groups of screw hole components spaced apart in the vertical direction. The screw hole components are connected to the cavity. The screw hole components include two or more threaded holes arranged opposite to each other in the horizontal direction. Each threaded hole corresponds to a group of clamping components. The clamping components include a thread block, an elastic member and a clamping bead. The thread block is threadedly connected to the threaded hole. One side of the elastic member is connected to the thread block, and the other side of the elastic member is connected to the clamping bead. The clamping bead is at least partially located in the cavity and is used to be clamped into the corresponding first clamping slot and the corresponding second clamping slot.

[0013] As an embodiment of the present invention, the inner quick plug also includes two raised rings respectively installed at both ends of the quick plug body, the outer diameter of the raised rings is smaller than the outer diameter of the quick plug body, and the two raised rings are respectively used to abut against the bearing sleeved on the top of the extrusion screw and the bearing seat of the drive unit.

[0014] As an implementation mode of the present invention, a hexagonal hole is formed on a side of the threaded block away from the cavity.

[0015] As an embodiment of the present invention, an external rotary joint includes a sleeve and two positioning blades respectively installed at both ends of the sleeve, the sleeve is sleeved outside the inner connector, the positioning blades include more than two groups of positioning components, the positioning components include a first hole and a second hole connected to the first hole, the second hole is opened around the circumference of the positioning blade, the second hole is an arc-shaped hole, and the rotating sleeve is used to position the fastener in the second hole.

[0016] As an embodiment of the present invention, the positioning assembly further includes a positioning spring piece, which is installed in the second hole and is used to fix the fastener in the second hole.

[0017] As an embodiment of the present invention, the first hole is an open hole, and the first hole is connected to the outside.

[0018] As an embodiment of the present invention, the housing is provided with outer cavities on both sides of the inner cavity, the outer cavity includes an external liquid inlet and an internal liquid outlet, and the internal liquid outlet of the outer cavity is connected to the inner cavity through a liquid inlet channel;

[0019] The 3D direct writing printing multifunctional nozzle device also includes a one-way valve, which is installed on the liquid inlet channel and is used to limit the material in the inner cavity from flowing out to the outer cavity.

[0020] As an embodiment of the present invention, the outer shell includes a rotating tower and a nozzle. The rotating tower is sleeved outside the extrusion screw. The bottom of the rotating tower is installed with a nozzle. The bottom of the nozzle is provided with a nozzle. The rotating tower and the nozzle are provided with protrusions protruding toward the extrusion screw.

[0021] Different from the prior art, the above technical solution sets a pyramid-shaped protrusion, so that after multiple materials enter the inner cavity, in addition to being mixed under the action of the extrusion screw, the protrusion can interfere with the flow direction of the materials, prolong the residence time in the inner cavity and divide the materials into multiple branches, and the separated materials reunite; on the other hand, the pyramid protrusion has multiple inclined surfaces that can cut the materials from different angles, generate multi-directional vortices, and more effectively break the flow of materials to make the mixing more uniform. Therefore, the pyramid-shaped protrusion can improve the mixing effect of the materials.

[0022] The above-mentioned records related to the invention content are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation mode and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.

[0024] In the drawings of the specification:

[0025] Figure 1 This is a structural schematic diagram of a 3D direct writing printing multifunctional nozzle device according to an embodiment of the present application;

[0026] Figure 2 This is a structural exploded view of a 3D direct writing printing multifunctional nozzle device according to one embodiment of the present application;

[0027] Figure 3 This is a front view of a 3D direct writing printing multifunctional nozzle device according to one embodiment of the present application;

[0028] Figure 4 for Figure 3 Sectional view of AA in the middle;

[0029] Figure 5 for Figure 4 Enlarged view of middle B;

[0030] Figure 6 A cross-sectional view of a housing according to an embodiment of the present application;

[0031] Figure 7 This is a schematic diagram of the structure of an inner quick plug according to an embodiment of the present application;

[0032] Figure 8 This is a front view of an inner quick plug according to an embodiment of the present application;

[0033] Fig. 9 for Figure 8 Cross-sectional view of CC;

[0034] Fig.10 This is a schematic structural diagram of an external rotary joint according to an embodiment of the present application;

[0035] Fig.11 This is a schematic diagram of the structure of a positioning blade according to an embodiment of the present application;

[0036] Fig.12 This is a schematic structural diagram of an embodiment of the present application in which an inner cavity and an outer cavity are connected via a liquid inlet channel.

[0037] The reference numerals in the above drawings are described as follows:

[0038] 100-3D direct writing printing multifunctional nozzle device; 1-housing; 11-inner cavity; 12-feeding port; 13-nozzle; 14-protrusion; 15-outer cavity; 151-first outer cavity; 152-second outer cavity; 16-liquid inlet channel; 17-rotating stacking tower; 18-spray throat; 19-feeding channel; 2-extrusion screw; 21-first card slot; 22-bearing; 3-drive unit; 31-second card slot; 4-connection assembly; 41-inner quick plug; 411-quick plug body; 4111-cavity; 4112-screw hole assembly; 4113-threaded hole; 4114-anti-slip thread ;412-clamping assembly;4121-threaded block;4122-elastic member;4123-card bead;4124-hexagonal hole;413-convex ring;4131-positioning hole;42-external rotary joint;421-sleeve;422-positioning blade;423-positioning assembly;4231-first hole;4232-second hole;4233-positioning spring;43-fastener;5-check valve;6-temperature sensor;7-hose quick connect;8-cleaning assembly;81-cleaning box;82-water pump;83-cleaning pipe;9-hose connector;X-horizontal direction;Y-vertical direction. DETAILED DESCRIPTION

[0039] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0040] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0041] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0042] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0043] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0044] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0045] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0046] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0047] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] For the convenience of explanation, the horizontal direction and the vertical direction are set, and the horizontal direction and the vertical direction are directions perpendicular to each other. Figure 5 As shown by the arrows, the direction of arrow X is the horizontal direction, and the direction of arrow Y is the vertical direction.

[0049] According to some embodiments of the present application, please refer to Figures 1 to 12 The present embodiment relates to a 3D direct writing printing multifunctional nozzle device 100, including a shell 1, an extrusion screw 2, a driving unit 3 and a connecting component 4, the middle part of the shell 1 has an inner cavity 11, the top of the shell 1 is provided with a feed port 12, the bottom of the shell 1 is provided with a nozzle 13, the feed port 12 and the nozzle 13 are both connected with the inner cavity 11; the extrusion screw 2 is installed in the inner cavity 11, the inner wall of the shell 1 is provided with a protrusion 14 protruding toward the extrusion screw 2, and the protrusion 14 is in a pyramid shape; the driving unit 3 is used to drive the extrusion screw 2 to rotate in the inner cavity 11; the connecting component 4 is used to connect the driving unit 3 and the extrusion screw 2.

[0050] The top of the housing 1 is evenly distributed around its circumference with more than two feed ports 12, and each feed port 12 can feed different materials, ensuring that multiple materials can enter the inner cavity 11 for mixing at the same time, and the mixing effect is better. In some embodiments, the housing 1 also includes a feed channel 19, and the feed port 12 is connected to the inner cavity 11 through the feed channel 19. The number of feed channels 19 corresponds to the number of feed ports 12, ensuring the individuality of each material, and at the same time, allowing each material to enter the inner cavity 11 through the feed channel 19 for mixing. In other embodiments, the feed port 12 is also connected to the outside through a hose connector 9, and the material can be connected to the feed channel 19 through the hose connector 9.

[0051] The extrusion screw 2 can be made of non-metallic material, such as PA, PP, ABS, to increase the life of the extrusion screw 2 and reduce the use cost and maintenance cost.

[0052] The driving unit 3 may be a power source such as an electric motor or a motor to drive the extrusion screw 2 to rotate in the inner cavity 11 .

[0053] The above technical solution sets a pyramid-shaped protrusion 14, so that after multiple materials enter the inner cavity 11, in addition to being mixed under the action of the extrusion screw 2, the protrusion 14 can interfere with the flow direction of the material, prolong the residence time in the inner cavity 11 and divide the material into multiple branches, and the separated materials reunite; on the other hand, the pyramid protrusion 14 has multiple inclined surfaces that can cut the material from different angles, generate multi-directional vortices, and more effectively break the flow of materials to make the mixing more uniform. Therefore, the mixing effect of the material can be improved by the pyramid-shaped protrusion 14. In addition, the inclined surface of the pyramid can guide the material to slide along the inclined surface, reduce the adhesion or retention of the material, and reduce the risk of dead zones. At the same time, the streamlined inclined surface of the pyramid can reduce the flow resistance. Compared with the right-angle protrusion 14, the pressure loss is reduced by 10% to 20%, and the energy consumption is lower at the same mixing efficiency.

[0054] According to some embodiments of the present application, optionally, Figures 2 to 5 As shown, the connecting assembly 4 includes an inner quick plug 41, an outer rotary joint 42 and a fastener 43. The inner quick plug 41 is used to connect the drive unit 3 and the extrusion screw 2. The outer rotary joint 42 is sleeved outside the inner quick plug 41. The two ends of the outer rotary joint 42 are respectively connected to the top of the housing 1 and the bearing seat of the drive unit 3 through the fastener 43.

[0055] The fastener 43 is a bolt, a stud or a screw, which has a simple structure and is convenient for installation and disassembly.

[0056] An outer rotary joint 42 is also sleeved outside the inner connector, and the outer rotary joint 42 cooperates with the fastener 43 to strengthen the connection between the housing 1 and the drive unit 3, thereby avoiding insufficient connection strength of the inner connector. In actual connection, first, the inner connector is connected to the drive unit 3 and the extrusion screw 2; secondly, the outer rotary joint 42 is sleeved outside the inner connector, and the outer rotary joint 42 is connected to the bearing seat of the drive unit 3 through the fastener 43, and then the housing 1 is sleeved outside the extrusion screw 2, and the outer rotary joint 42 is connected to the top of the housing 1 through the fastener 43; finally, the tightness is adjusted by hand-tightening the fastener 43 to control the connection accuracy.

[0057] According to some embodiments of the present application, optionally, Figure 4 , Figure 5 as well as Figures 7 to 9 As shown, the outer surface of the top of the extrusion screw 2 is provided with two first card grooves 21 relatively along the horizontal direction X, and the outer surface of the output shaft of the driving unit 3 is provided with two second card grooves 31 relatively along the horizontal direction X; the inner quick plug 41 includes a quick plug body 411 and two or more sets of card connection components 412, the inside of the quick plug body 411 has a cavity 4111, and the quick plug body 411 is provided with two sets of screw hole components 4112 spaced apart along the vertical direction Y, the screw hole components 4112 are connected to the cavity 4111, and the screw hole components 4112 include a screw hole component 4112 disposed along the water There are more than two threaded holes 4113 relatively arranged in the horizontal direction X, each threaded hole 4113 corresponds to a group of snap-in components 412, the snap-in components 412 include a threaded block 4121, an elastic member 4122 and a snap bead 4123, the threaded block 4121 is threadedly connected to the threaded hole 4113, one side of the elastic member 4122 is connected to the threaded block 4121, and the other side of the elastic member 4122 is connected to the snap bead 4123, the snap bead 4123 is at least partially located in the cavity 4111, and is used to snap into the corresponding first slot 21 and the corresponding second slot 31.

[0058] The outer surface of the quick plug body 411 is provided with an anti-skid thread 4114. Thus, the anti-skid thread 4114 increases the friction of the outer surface of the quick plug body 411, thereby facilitating the taking or rotating of the quick plug body 411.

[0059] The elastic member 4122 is elastic and can shrink elastically when subjected to pressure and restore its original shape when the pressure disappears. It can be made of metal elastic materials such as metal springs, or non-metal elastic materials such as rubber and silicone.

[0060] In actual use, the quick plug body 411 is connected to the extrusion screw 2 and the drive unit 3, and at this time, the threaded hole 4113 is not screwed into the clamping assembly 412. Afterwards, the clamping assembly 412 is screwed into the threaded hole 4113, and the clamping bead 4123 hits the extrusion screw 2 and the output shaft of the drive unit 3, and the elastic member 4122 is compressed and deformed. Finally, the quick plug body 411 can be rotated to align the clamping bead 4123 with the first clamping slot 21 and the second clamping slot 31. The clamping bead 4123 returns to its original state under the action of the elastic member 4122, and the clamping bead 4123 is clamped into the first clamping slot 21 and the second clamping slot 31.

[0061] Two first card slots 21 and two second card slots 31 are provided, and the number of the card-joint components 412 needs to correspond to the number of the card slots, so that the multiple groups of card-joint components 412 strengthen the connection between the extrusion screw 2 and the driving unit 3 .

[0062] According to some embodiments of the present application, optionally, Figures 7 to 9 As shown, the inner quick plug 41 also includes two raised rings 413 respectively installed at both ends of the quick plug body 411, the outer diameter of the raised ring 413 is smaller than the outer diameter of the quick plug body 411, and the two raised rings 413 are respectively used to abut against the bearing 22 sleeved on the top of the extrusion screw 2 and the bearing seat of the drive unit 3.

[0063] Two protruding rings 413 are provided at both ends of the quick plug body 411, and the outer diameter of the protruding rings 413 is smaller than the outer diameter of the quick plug body 411, so that the contact surface of the quick plug and the bearing 22 of the extrusion screw 2 and the bearing seat of the drive unit 3 is reduced, thereby reducing wear and extending the service life.

[0064] According to some embodiments of the present application, optionally, Fig. 9 As shown, a positioning hole 4131 is also provided in the convex ring 413. The positioning hole 4131 is chamfered and is used to position the extrusion screw 2. By providing the positioning hole 4131 and coordinating with the extrusion screw 2, the connection position of the quick plug body 411 is determined, so that the quick plug body 411 is conveniently connected with the first card slot 21 and the second card slot 31.

[0065] According to some embodiments of the present application, optionally, Figure 5 As shown, a hexagonal hole 4124 is formed on a side of the threaded block 4121 away from the cavity 4111 .

[0066] In this way, when the clamping assembly 412 needs to be canceled, the threaded block 4121 can be taken out with the help of an external tool, so that the elastic member 4122 and the clamping bead 4123 connected thereto can be taken out together, and the first clamping slot 21 and the second clamping slot 31 can be canceled. In some embodiments, the 3D direct writing printing multifunctional nozzle device 100 also includes an inner hexagonal wrench, which is used to cooperate with the inner hexagonal hole 4124 to cancel the clamping bead 4123 from limiting the first clamping slot 21 and the second clamping slot 31.

[0067] According to some embodiments of the present application, optionally, Fig.10 and Fig.11 As shown, the external rotary joint 42 includes a sleeve 421 and two positioning blades 422 respectively installed at both ends of the sleeve 421, the sleeve 421 is sleeved outside the internal connector, the positioning blades 422 include more than two groups of positioning components 423, the positioning components 423 include a first hole 4231 and a second hole 4232 connected to the first hole 4231, the second hole 4232 is opened around the circumference of the positioning blade 422, the second hole 4232 is an arc hole, and the rotating sleeve 421 is used to position the second hole 4232 to position the fastener 43.

[0068] Preferably, the positioning blade 422 is evenly provided with four groups of positioning components 423 around its circumference. One fastener 43 corresponds to one group of positioning components 423, and providing multiple positioning components 423 can further strengthen the connection between the housing 1 and the drive unit 3. The positioning blade 422 is provided as a transparent blade, so that the user can observe the position of the fastener 43 and adjust it according to the actual situation.

[0069] The two or more positioning components 423 provided on the positioning blade 422 are used to position the fastener 43, which ensures the connection stability and firmness of the fastener 43, and can also facilitate further adjustment of the tightness of the fastener 43 after the fastener 43 is connected, so as to control the connection with higher precision. Specifically, the first hole 4231 is used for inserting the fastener 43. After the fastener 43 is connected to the housing 1 and the drive unit 3, the sleeve 421 is rotated to allow the fastener 43 to be inserted into the second hole 4232 along the arc hole.

[0070] According to some embodiments of the present application, optionally, Fig.11 As shown, the positioning assembly 423 further includes a positioning spring piece 4233 , which is installed in the second hole 4232 , and is used to fix the fastener 43 in the second hole 4232 .

[0071] The fastener 43 is fixed in the second hole 4232 by providing the positioning spring piece 4233 , thereby preventing the fastener 43 from being displaced.

[0072] According to some embodiments of the present application, optionally, the first hole 4231 is an open hole, and the first hole 4231 is connected to the outside.

[0073] The first hole 4231 is an open hole, which makes it easier to insert the fastener 43 and adjust the position of the fastener 43 according to actual conditions.

[0074] According to some embodiments of the present application, optionally, Figure 4 and Figure 6 As shown, the outer cavity 15 is opened on both sides of the inner cavity 11 of the outer cavity 15, and the outer cavity 15 includes an external liquid inlet and an internal liquid outlet. The internal liquid outlet of the outer cavity 15 is connected with the inner cavity 11 through a liquid inlet channel 16; the 3D direct writing printing multifunctional nozzle device 100 also includes a one-way valve 5, which is installed on the liquid inlet channel 16, and the one-way valve 5 is used to limit the material in the inner cavity 11 from flowing out of the outer cavity 15.

[0075] The side surface of the housing 1 is provided with two or more outer cavities 15 at intervals along the vertical direction Y. The plurality of outer cavities 15 are provided so that as much liquid as possible flows into the inner cavity 11 or the outer cavities 15 are filled with sufficient coolant to ensure the cooling effect.

[0076] Optionally, the 3D direct writing printing multifunctional nozzle device 100 further includes a hose quick connector 7, and the liquid outlet of the hose quick connector 7 is connected to the external liquid inlet. By providing the hose quick connector 7, it can be conveniently connected to the external cavity 15, and the hose quick connector 7 plays a connecting role.

[0077] The inner cavity 11 can be cleaned by flowing water or cleaning agent into the outer cavity 15 , and the extrusion screw 2 in the inner cavity 11 can be cleaned under the action of the driving unit 3 . The operation is simple and there is no need to disassemble the entire nozzle device.

[0078] According to some embodiments of the present application, optionally, the 3D direct writing printing multifunctional nozzle device 100 further includes a pressure controller, and the pressure controller is used to control the pressure between the outer cavity 15 and the inner cavity 11.

[0079] In this way, a pressure controller is provided to control the pressure between the outer cavity 15 and the inner cavity 11, thereby controlling the conduction or non-conduction between the outer cavity 15 and the inner cavity 11. Specifically, when there is no conduction between the outer cavity 15 and the inner cavity 11, the air pressure of the inner cavity 11 and the outer cavity 15 are consistent; when there is a need for conduction between the outer cavity 15 and the inner cavity 11, the pressure controller controls the air pressure of the outer cavity 15 to increase, thereby promoting the liquid to be transported to the inner cavity 11. In some embodiments, the pressure controller can also control the pressure in the inner cavity 11, thereby controlling the outflow of the material in the inner cavity 11.

[0080] According to some embodiments of the present application, optionally, Fig.12As shown, the 3D direct writing printing multifunctional nozzle device 100 also includes a temperature sensor 6, which is installed in the inner cavity 11. The temperature sensor 6 is used to detect the temperature in the inner cavity 11. By setting the temperature sensor 6, the temperature of the inner cavity 11 can be monitored in real time to prevent the extrusion screw 2 from being too high during the extrusion operation.

[0081] According to some embodiments of the present application, optionally, Fig.12 As shown, the 3D direct writing printing multifunctional nozzle device 100 also includes a cleaning component 8, which includes a cleaning box 81, a water pump 82 and a cleaning pipe 83. The water pump 82 is installed in the cleaning box 81, and the liquid outlet of the cleaning box 81 is connected to the liquid inlet of the cleaning pipe 83, and the liquid outlet of the cleaning pipe 83 is connected to the liquid inlet of the hose quick connector 7.

[0082] By providing the cleaning assembly 8, it is convenient to flow the water or cleaning agent in the cleaning box 81 into the outer cavity 15, and then flow into the inner cavity 11 through the outer cavity 15, so as to achieve a cleaning effect. In some embodiments, the number of cleaning pipes 83 is set according to the number of outer cavities 15. In other embodiments, the cleaning agent or water can also be directly poured into the outer cavity 15.

[0083] According to some embodiments of the present application, optionally, the 3D direct writing printing multifunctional nozzle device 100 further includes a cooling tank, and the liquid outlet of the cooling tank is connected to the liquid inlet of the hose quick connector 7.

[0084] The cooling tank is filled with coolant, which is poured into the outer cavity 15. At this time, the air pressure between the inner cavity 11 and the outer cavity 15 is balanced, and the temperature of the outer cavity 15 is transmitted to the inner cavity 11 through the cavity wall, ensuring that the temperature of the inner cavity 11 does not change, so that the consumables maintain a stable fluid state, the printing state is more stable, the printing results are more beautiful, and the manual operation required for post-processing due to unsightly printing results is reduced.

[0085] According to some embodiments of the present application, optionally, Figure 2 As shown, the housing 1 includes a rotating tower 17 and a nozzle 18. The rotating tower 17 is sleeved outside the extrusion screw 2. The nozzle 18 is installed at the bottom of the rotating tower 17. The bottom of the nozzle 18 is provided with a nozzle 13. The rotating tower 17 and the nozzle 18 are provided with a protrusion 14 protruding toward the extrusion screw 2.

[0086] The nozzle 18 and the nozzle 13 can be connected by snapping or magnetic attraction. Among them, the nozzle 13 can flexibly change the aperture of different sizes to extrude lines of different thicknesses, thereby controlling the printing calibration and controlling the accuracy and fineness of the printed model. The rotating stack tower 17 and the nozzle 18 can be adjusted and lengthened as needed. The longer the pyramid protrusions 14 are, the denser they are, which can effectively improve the effect of dispersion and mixing.

[0087] The working principle of a 3D direct writing printing multifunctional nozzle device 100 is as follows:

[0088] like Figure 6 As shown, the outer cavity 15 includes a first outer cavity 151 and a second outer cavity 152. The materials include A material, B material and C material, and enter through an external controller, and the external controller can accurately control the input amount of A material, B material and C material. A material enters the inner cavity 11 from the feed port 12 through the feed channel 19, B material can enter the inner cavity 11 from the first outer cavity 151 through the corresponding liquid inlet channel 16, and C material can enter the inner cavity 11 from the second outer cavity 152 through the corresponding liquid inlet channel 16. A material, B material and C material need to be mixed in the inner cavity 11, and the consumables can achieve a better mixing effect through the rotation and extrusion of the extrusion screw and the cutting and diversion of the pyramid-shaped protrusion 14. Among them, A material is the main raw material, and B material and C material are additives or water. When cleaning is required, water or other cleaning agents enter the inner cavity 11 from the outer cavity 15 through the liquid inlet channel 16, and the inner cavity 11 can be automatically cleaned under the rotation of the screw, and there is no need to remove the device for cleaning one by one. In addition, the outer cavity 15 can also be used for temperature control. Specifically, the outer cavity 15 is filled with liquid at a fixed temperature. At this time, the air pressure between the inner cavity 11 and the outer cavity 15 is balanced, and the temperature of the outer cavity 15 is transmitted to the inner cavity 11 through the cavity wall, ensuring that the temperature of the inner cavity 11 does not change, so that the consumables maintain a stable fluid state, the printing state is more stable, the printing results are more beautiful, and the manual operation required for post-processing due to unsightly printing results is reduced.

[0089] It should be noted that, although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present invention specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.

Claims

1. A 3D direct writing printing multifunctional nozzle device, characterized in that: include: A shell, wherein the middle of the shell has an inner cavity, the top of the shell is provided with a feed port, the bottom of the shell is provided with a nozzle, and the feed port and the nozzle are both connected to the inner cavity; An extrusion screw, the extrusion screw is installed in the inner cavity, and the inner wall of the shell is provided with a protrusion protruding toward the extrusion screw, and the protrusion is in a pyramid shape; A driving unit, the driving unit is used to drive the extrusion screw to rotate in the inner cavity; A connecting assembly is used to connect the driving unit and the extrusion screw.

2. The 3D direct writing printing multifunctional nozzle device according to claim 1, characterized in that: The connecting assembly includes an inner quick plug, an outer rotary joint and a fastener, wherein the inner quick plug is used to connect the drive unit and the extrusion screw, and the outer rotary joint is sleeved outside the inner quick plug, and the two ends of the outer rotary joint are respectively connected to the top of the shell and the bearing seat of the drive unit through the fastener.

3. The 3D direct writing printing multifunctional nozzle device according to claim 2, characterized in that: The outer surface of the top of the extrusion screw is provided with two first slots in a horizontal direction, and the outer surface of the output shaft of the driving unit is provided with two second slots in a horizontal direction. The inner quick plug includes a quick plug body and two or more groups of clamping components. The quick plug body has a cavity inside. The quick plug body is provided with two groups of screw hole components spaced apart in a vertical direction. The screw hole components are communicated with the cavity. The screw hole components include two or more threaded holes arranged opposite to each other in a horizontal direction. Each threaded hole corresponds to a group of the clamping components. The clamping components include a thread block, an elastic member and a clamping bead. The thread block is threadedly connected to the threaded hole. One side of the elastic member is connected to the thread block, and the other side of the elastic member is connected to the clamping bead. The clamping bead is at least partially located in the cavity and is used to be clamped into the corresponding first clamping slot and the corresponding second clamping slot.

4. The 3D direct writing printing multifunctional nozzle device according to claim 3, characterized in that: The inner quick plug also includes two raised rings respectively installed at both ends of the quick plug body, the outer diameter of the raised rings is smaller than the outer diameter of the quick plug body, and the two raised rings are respectively used to abut against the bearing sleeved on the top of the extrusion screw and the bearing seat of the drive unit.

5. The 3D direct writing printing multifunctional nozzle device according to claim 3, characterized in that: A hexagonal hole is formed on a side of the threaded block away from the cavity.

6. The 3D direct writing printing multifunctional nozzle device according to claim 2, characterized in that: The external rotary joint includes a sleeve and two positioning blades respectively installed at both ends of the sleeve, the sleeve is sleeved outside the internal connector, the positioning blades include more than two groups of positioning components, the positioning components include a first hole and a second hole connected to the first hole, the second hole is opened around the circumference of the positioning blade, the second hole is an arc hole, and rotating the sleeve is used to position the fastener through the second hole.

7. The 3D direct writing printing multifunctional nozzle device according to claim 6, characterized in that: The positioning assembly further includes a positioning spring piece, which is installed in the second hole and is used to fix the fastener in the second hole.

8. The 3D direct writing printing multifunctional nozzle device according to claim 6, characterized in that: The first hole is an open hole, and the first hole is connected to the outside.

9. The 3D direct writing printing multifunctional nozzle device according to claim 1, characterized in that: The shell is provided with an outer cavity on both sides of the inner cavity, the outer cavity includes an external liquid inlet and an internal liquid outlet, and the internal liquid outlet of the outer cavity is connected with the inner cavity through a liquid inlet channel; The 3D direct writing printing multifunctional nozzle device also includes a one-way valve, which is installed on the liquid inlet channel and is used to limit the material in the inner cavity from flowing out to the outer cavity.

10. The 3D direct writing printing multifunctional nozzle device according to claim 1, characterized in that: The shell includes a rotating tower and a nozzle. The rotating tower is sleeved outside the extrusion screw. The nozzle is installed at the bottom of the rotating tower. The nozzle is arranged at the bottom of the nozzle. The rotating tower and the nozzle are provided with the protrusion protruding toward the extrusion screw.

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