CN112873840A - 3D printing nozzle, 3D printing nozzle assembly and 3D printing method - Google Patents
3D printing nozzle, 3D printing nozzle assembly and 3D printing method Download PDFInfo
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- CN112873840A CN112873840A CN202110159107.0A CN202110159107A CN112873840A CN 112873840 A CN112873840 A CN 112873840A CN 202110159107 A CN202110159107 A CN 202110159107A CN 112873840 A CN112873840 A CN 112873840A
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- 238000010146 3D printing Methods 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 185
- 238000007639 printing Methods 0.000 claims abstract description 66
- 230000002265 prevention Effects 0.000 claims description 24
- 238000007599 discharging Methods 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 11
- 239000007921 spray Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000000151 anti-reflux effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/209—Heads; Nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
Abstract
The embodiment of the invention provides a 3D printing nozzle, a 3D printing nozzle assembly and a 3D printing method. Wherein, 3D prints the shower nozzle and includes the shower nozzle main part and set up material conveying channel in the shower nozzle main part, material conveying channel's first end and outside feed cylinder intercommunication and second end are used for exporting the printing material, and it is provided with anti-return device to establish ties on every material conveying channel to anti-return device configures into and allows the printing material to hold to the second by material conveying channel's first end unidirectional flow. The 3D printing nozzle assembly includes a plurality of 3D printing nozzles as described above disposed side by side with each other. The 3D printing method is performed by the 3D printing head or the 3D printing head assembly as described above. This 3D prints shower nozzle can realize multiple printing material output, can effectively prevent to print the material backward flow, has advantages such as simple structure, low cost, easy to use and easy control simultaneously.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a 3D printing nozzle, a 3D printing nozzle assembly and a 3D printing method.
Background
3D printing is increasingly well known as an emerging rapid prototyping manufacturing approach. The method is a technology for constructing an object by using a digital model file as a base and a special printing material in a layer-by-layer printing mode. The method has the characteristics of rapid forming, no limitation of printing shapes, high material utilization rate, distributable production, low assembly cost and the like. The technology is widely applied to the fields of aerospace, automobiles and ships, biomedical treatment, wearable equipment, micro-nano sensing, flexible electronics and the like.
The traditional 3D printing nozzle has the problems that the printing material reflows and a material conveying channel is easy to block; simultaneously, general 3D prints the shower nozzle and can only extrude a printing material, when needing multiple printing material to print, only prints shower nozzle mechanical type with a plurality of 3D and integrate together, and a plurality of 3D print shower nozzle integrated structure has manufacturing cost height, structure complicacy, control unstability, occupation space are big, printing speed is slow scheduling problem.
Disclosure of Invention
The embodiment of the invention provides a 3D printing nozzle, a 3D printing nozzle assembly and a 3D printing method, and aims to solve the problems that an existing 3D printing nozzle is prone to printing material backflow, a material conveying channel is prone to blocking, and conveying of printing materials is single.
According to an embodiment of the first aspect of the invention, a 3D printing spray head is provided, which comprises a spray head main body and a material conveying channel arranged in the spray head main body,
wherein the first end of the material conveying channel is communicated with an external material barrel, the second end of the material conveying channel is used for outputting printing materials, a backflow prevention device is arranged on each material conveying channel in series, and the backflow prevention device is configured to allow the printing materials to flow from the first end to the second end of the material conveying channel in a one-way mode.
According to an embodiment of the invention, the material conveying channel comprises:
a material body passage connected between the outer barrel and a first end of the backflow prevention device, and the first end of the material delivery passage is formed on the material body passage;
the material body output pipe is connected with the second end of the backflow preventer;
a collection chamber connected to the volume output tube;
an output flow channel connected with the collection chamber and on which the second end of the material transport channel is formed.
According to an embodiment of the invention, the material transport channel further comprises a plurality of the material body channels and a plurality of the material body outlet ducts, wherein the plurality of material body channels and the plurality of material body outlet ducts share the collecting chamber and the outlet flow channel.
According to an embodiment of the present invention, the material conveying channel further includes a plurality of the collecting chambers, and a plurality of the output flow channels corresponding to the collecting chambers in number and connected correspondingly.
According to an embodiment of the invention, the backflow prevention device comprises a plurality of backflow prevention units which are connected end to end, wherein a scroll-type flow path for inhibiting backflow of the printing material can be formed inside each backflow prevention unit.
According to an embodiment of the present invention, the backflow preventing unit is configured in a tapered structure or a heart-shaped structure.
According to an embodiment of the invention, the backflow prevention unit is configured as a valvular one-way passage structure.
According to an embodiment of the invention, the diameter of the volume outlet conduit is smaller than the diameter of the collecting chamber, and the diameter of the collecting chamber is smaller than or equal to the diameter of the outlet flow channel.
According to an embodiment of the second aspect of the present invention, there is provided a 3D printing nozzle assembly including a plurality of 3D printing nozzles as described above arranged side by side with each other.
According to an embodiment of the third aspect of the present invention, there is provided a 3D printing method, the 3D printing method being performed by the 3D printing head or the 3D printing head assembly as described above, the 3D printing method including:
installing the 3D printing nozzle on a 3D printer, and correspondingly connecting an external material cylinder and a pressure control device with the 3D printing nozzle;
planning a printing path of a three-dimensional structure to be printed and a material to be printed to generate a path file;
and setting control pressure according to the characteristics of the printing materials in each material conveying channel to regulate and control the wire discharging speed, so that the output printing wires have the required shapes and the set diameters, and finally finishing printing.
In the 3D printing nozzle provided by the embodiment of the present invention, the material conveying channels are arranged in the nozzle body, a first end of each material conveying channel is communicated with an external cylinder, and a second end of each material conveying channel is used for outputting a printing material, a backflow prevention device is arranged in series on each material conveying channel, and the backflow prevention devices are configured to allow the printing material to flow from the first end to the second end of each material conveying channel in a single direction. Through the inside series arrangement of shower nozzle main part anti-reflux device for print the material can only by material transfer passage's first end flow direction material transfer passage's second end, and can not follow material transfer passage's second end flow direction material transfer passage's first end has realized that 3D prints the function that the shower nozzle prevented to print the material backward flow.
Further, in the 3D printing nozzle assembly provided by the embodiment of the present invention, since the 3D printing nozzle is adopted, the 3D printing nozzle assembly also has the advantages as described above.
Further, in the 3D printing method provided in the embodiment of the present invention, since the 3D printing method is performed by the 3D printing head or the 3D printing head assembly, the advantages as described above are also provided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a 3D print head provided by an embodiment of the present invention when two external cartridges are loaded;
fig. 2 is a schematic structural diagram of a 3D printing head using a backflow prevention device with a conical structure according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of the backflow device of the tapered structure of FIG. 2;
fig. 4 is a schematic structural diagram of a 3D printing head using a backflow prevention device with a heart-shaped structure according to an embodiment of the present invention;
FIG. 5 is an enlarged partial view of the backflow device of the center-shaped configuration of FIG. 4;
fig. 6 is a schematic structural diagram of a 3D printing head using a backflow prevention device with a valve-shaped one-way channel structure according to an embodiment of the present invention;
FIG. 7 is a schematic view of the valve-shaped one-way passage structure with positive flow of printing material;
FIG. 8 is a schematic view of a valve-shaped one-way passage configuration with reverse flow of printing material;
FIG. 9 is an enlarged partial view of the dashed square portion of FIG. 2;
fig. 10 is a schematic structural diagram of a 3D printing head provided by an embodiment of the invention when four material body channels and four material body output tubes share a collecting chamber and an output flow channel;
fig. 11a and 11b are schematic structural diagrams of a 3D printing nozzle provided by an embodiment of the invention, wherein two outer material barrels, a plurality of material body channels and a plurality of material body output pipes correspond to a plurality of collecting chambers and a plurality of output flow channels;
fig. 12a and 12b are schematic structural diagrams of two outer material barrels, a plurality of material body channels and a plurality of material body output pipes in a 3D printing spray head, which are provided by the embodiment of the invention, corresponding to a plurality of collecting chambers and a plurality of output flow channels;
fig. 13a, 13b and 13c are schematic structural diagrams showing a third structure of a 3D printing head according to an embodiment of the present invention, in which two outer cartridges, a plurality of material body channels and a plurality of material body output tubes correspond to a plurality of collecting chambers and a plurality of output flow channels;
14a and 14b are schematic structural diagrams of a 3D printing nozzle assembly according to an embodiment of the present invention;
15a, 15b and 15c are schematic structural diagrams of a 3D printing nozzle assembly according to an embodiment of the present invention;
fig. 16 is a first flowchart of a 3D printing method provided by an embodiment of the present invention;
fig. 17 is a second flowchart of a 3D printing method according to an embodiment of the present invention;
fig. 18 is a diagram printed by the 3D printing method provided by the embodiment of the present invention.
Reference numerals:
1: an outer barrel; 2: a nozzle body; 3: a material body channel; 4: a backflow prevention device; 401: a tapered structure; 402: a heart-shaped structure; 403: a valve-shaped one-way passage structure; 5: a material body output pipe; 6: a collection chamber; 7: and (4) outputting the flow channel.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification to make the purpose, technical solution, and advantages of the embodiments of the present invention more clear, and the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The 3D printing nozzle, the 3D printing nozzle assembly, and the 3D printing method according to the embodiments of the present invention are described below with reference to fig. 1 to 18. It should be understood that the following description is only exemplary embodiments of the present invention and does not constitute any particular limitation of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a 3D printing head. This 3D prints shower nozzle includes: a spray head main body 2 and a material conveying channel arranged in the spray head main body 2.
Wherein, the first end of material transfer passage and outside feed cylinder 1 intercommunication and the second end is used for exporting the printing material, and the last series connection of every material transfer passage is provided with anti-return device 4 to anti-return device 4 is configured to allow the printing material to be followed the first end one-way flow of material transfer passage to the second end.
According to the above, in the 3D printing nozzle provided in the embodiment of the present invention, the material conveying channel is disposed in the nozzle body 2, and the first end of the material conveying channel is communicated with the external cylinder and the second end is used for outputting the printing material, the backflow preventing device 4 is disposed in series on each material conveying channel, and the backflow preventing device 4 is configured to allow the printing material to flow from the first end of the material conveying channel to the second end in a single direction. Through setting up anti-return device 4 at 5 inside series connections of shower nozzle main part for the printing material can only be held by material transfer passage's first end flow direction material transfer passage's second, and can not hold the first end that flows into material transfer passage from material transfer passage's second, has realized that 3D prints the function that the shower nozzle prevents to print the material backward flow.
It is noted herein that in one embodiment of the present invention, the printing substance includes, but is not limited to, ink. In other embodiments, other suitable printing materials may be used, and the invention is not limited in this regard.
Specifically, as shown in fig. 1 and 2, in one embodiment of the present invention, the material conveying passage includes:
a material body passage 3 connected between the outer barrel 1 and a first end of the backflow prevention device 4, and a first end of the material delivery passage is formed on the material body passage 3;
the material body output pipe 5 is connected with the second end of the backflow preventer 4;
a collecting chamber 6 connected with the material body output pipe 5;
an outlet channel 7 is connected to the collecting chamber 6, and a second end of the material conveying channel is formed on the outlet channel 7.
Further, in one embodiment of the present invention, the backflow preventing device 4 includes a plurality of backflow preventing units connected end to end with each other, wherein a scroll-type flow path that suppresses backflow of the printing material can be formed inside each backflow preventing unit.
Specifically, in one embodiment of the present invention, as shown in fig. 2 and 3, the backflow preventing unit is configured in a tapered structure. The backflow preventer 4 is formed by a plurality of cone-shaped structures which are connected end to end in sequence. When printing the material backward flow, form the vortex formula flow path that restraines the printing material backward flow in the toper structure, the resistance of increase printing material backward flow realizes that 3D prints the shower nozzle and prevents the effect of printing the material backward flow.
Alternatively, as shown in fig. 4 and 5, the backflow preventing unit is configured in a heart-shaped structure. The backflow preventer 4 is formed by a plurality of heart-shaped structures which are connected end to end in sequence. When printing the material backward flow, form the vortex formula flow path that restraines the printing material backward flow in heart-shaped structure, the resistance of increase printing material backward flow realizes that 3D prints the effect that the shower nozzle prevents to print the material backward flow.
For another example, in one embodiment of the present invention, as shown in FIG. 6, the backflow prevention unit is configured in a valvular one-way passage structure. As shown in fig. 7, when the printing material flows in the forward direction, the valve-shaped one-way passage structure is opened, and the printing material is smoothly output from the output flow passage 7; as shown in fig. 8, when the printing material reversely flows back, the valve-shaped one-way passage structure is closed, preventing the printing material from being output. From this realize that 3D prints the shower nozzle and prevent the effect of printing the material backward flow.
In one embodiment of the invention, as shown in fig. 9, the diameter of the outlet tube 5 of the body is smaller than the diameter of the collecting chamber 6, and the diameter of the collecting chamber 6 is smaller than or equal to the diameter of the outlet channel 7.
The printing material body firstly flows downstream from the material body channel 3 into the backflow prevention device 4, then flows through the material body output pipe 5, then passes through the collecting chamber 6, and finally is output from the output flow channel 7. The diameter of the material body output pipe 5 is smaller than that of the collecting chamber 6, the diameter of the collecting chamber 6 is smaller than or equal to that of the output flow channel 7, namely the through flow of the material body output pipe 5 is smaller than that of the collecting chamber 6, and the through flow of the collecting chamber 6 is smaller than or equal to that of the output flow channel 7. The printing materials flow from the material body output pipe 5 with small through flow rate to the collecting chamber 6 with large through flow rate, and then flow from the collecting chamber 6 with large through flow rate to the output flow channel 7 with the same through flow rate or larger through flow rate for output, so that the blockage of the material conveying channel can be effectively prevented.
Further, in one embodiment of the invention, the material transport channel further comprises a plurality of material body channels 3 and a plurality of material body outlet pipes 5, wherein the plurality of material body channels 3 and the plurality of material body outlet pipes 5 share the collecting chamber 6 and the outlet flow channel 7.
For example, as shown in fig. 10, the material conveying channel comprises four material body channels 3 and four material body outlet pipes 5, wherein the four material body channels 3 and the four material body outlet pipes 5 share a collecting chamber 6 and an outlet flow channel 7
The four printing materials enter the material body channels 3 from the external material barrel 1, flow through the anti-backflow devices 4 connected in series in the material conveying channels, then enter the common collection chamber 6 through the material body output pipes 5 to be mixed, and finally the mixed printing materials are output through the output flow channel 7 to finish 3D printing work.
According to the embodiment described above, a plurality of material conveying channels are integrated in a single nozzle body 4, and a single 3D printing nozzle can realize output of a plurality of printing materials, so that the limitation of single printing material output of the traditional 3D printing nozzle is broken through. Simultaneously, compare with the structure that realizes multiple printing material output with a plurality of 3D printing shower nozzles integration among the prior art, this 3D printing shower nozzle has advantages such as simple structure, low cost, easy to use and easy control. Moreover, the plurality of the material body channels 3 and the plurality of the material body output pipes 5 share the collecting cavity 6 and the output flow channel 7, so that the mixing function of various printing materials is realized.
In one embodiment of the present invention, the material conveying channel further includes a plurality of collecting chambers 6, and a plurality of output flow channels 7 corresponding to the number of the collecting chambers 6 and connected correspondingly.
For example, as shown in fig. 11a and 11b, in which fig. 11b is a left side view of fig. 11a, in one embodiment of the present invention, two rows of material body channels are commonly provided in the 3D printing head, and two rows of material body channels share two outer cartridges. 10 material body channels are provided per row, and the 10 material body channels of each row share 1 external cartridge.
For another example, as shown in fig. 12a and 12b, wherein fig. 12b is a left side view of fig. 12a, in a further embodiment of the present invention, 32 material body channels are provided in total in the 3D print head, and all the material body channels share 2 outer cartridges.
For another example, as shown in fig. 13a to 13c, where fig. 13c is a left side view of fig. 13b, two rows of the material body channels are commonly provided in the 3D print head, and 8 material body channels are provided in each row. The 8 material body channels of each row share 1 external cartridge. I.e. two rows of material channels share 2 outer cartridges.
According to the embodiment described above, by providing two external cartridges and a plurality of material body channels, array printing of two printing materials can be realized, and thus printing efficiency is improved.
In addition, the embodiment of the invention also provides a 3D printing nozzle assembly, and the 3D printing nozzle assembly comprises a plurality of 3D printing nozzles as described above.
For example, as shown in fig. 14a and 14b, where 14b is a left side view of fig. 14 a. The 3D printing nozzle assembly comprises 10 3D printing nozzles, and the 10 3D printing nozzles are configured in a 10 x 1 array form. I.e. a one-dimensional array.
For another example, as shown in fig. 15a to 15c, fig. 15b is a left side view of fig. 15a, and fig. 15c is a top view of fig. 15 a. The 3D printing nozzle assembly comprises 50 3D printing nozzles. The 50 3D printing heads are arranged in a 10 × 5 array. I.e. a two-dimensional array.
However, it should be understood that the present invention is not limited in any way to the integrated number and integrated form of the 3D printing head. The integrated number and the integrated form of the 3D printing nozzles are determined according to specific needs.
The 3D printing nozzle assembly formed in the integrated mode can realize 3D printing with large area, multiple materials and high flux, and improves the 3D printing speed. Meanwhile, the 3D printing nozzle assembly comprises the 3D printing nozzle, so that the 3D printing nozzle assembly also has the advantages.
Further, in a 3D printing nozzle assembly provided by an embodiment of the present invention, a plurality of integrated 3D printing nozzles are respectively and correspondingly provided with external cartridges.
Alternatively, in a 3D print head assembly provided by an embodiment of the present invention, a plurality of integrated 3D print heads may share one or more external cartridges.
Therefore, the 3D printing device can be simplified while large-area, multi-material and high-flux 3D printing is realized, and the cost is saved.
In addition, as shown in fig. 16 to 18, an embodiment of the present invention further provides a 3D printing method, where the 3D printing method is performed by the 3D printing head or the 3D printing head assembly, and the 3D printing method includes:
installing a 3D printing nozzle on a 3D printer, and correspondingly connecting an external charging barrel 1 and a pressure control device with the 3D printing nozzle;
planning a printing path of a three-dimensional structure to be printed and a material to be printed to generate a path file;
and setting control pressure according to the characteristics of the printing materials in each material conveying channel to regulate and control the wire discharging speed, so that the output printing wire has the required shape and the set diameter, and finally finishing printing.
Since the 3D printing method is performed by the 3D printing nozzle or the 3D printing nozzle assembly as described above, the advantages as described above are also provided.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A3D printing nozzle is characterized by comprising a nozzle main body and a material conveying channel arranged in the nozzle main body,
wherein the first end of the material conveying channel is communicated with an external material barrel, the second end of the material conveying channel is used for outputting printing materials, a backflow prevention device is arranged on each material conveying channel in series, and the backflow prevention device is configured to allow the printing materials to flow from the first end to the second end of the material conveying channel in a one-way mode.
2. The 3D printing nozzle of claim 1, wherein the material transport channel comprises:
a material body passage connected between the outer barrel and a first end of the backflow prevention device, and the first end of the material delivery passage is formed on the material body passage;
the material body output pipe is connected with the second end of the backflow preventer;
a collection chamber connected to the volume output tube;
an output flow channel connected with the collection chamber and on which the second end of the material transport channel is formed.
3. The 3D printing nozzle of claim 2, wherein the material delivery channel further comprises a plurality of the material body channels and a plurality of the material body outlets, wherein the plurality of material body channels and the plurality of material body outlets share the collection chamber and the outlet flow channel.
4. The 3D printing nozzle according to claim 3, wherein the material conveying channel further comprises a plurality of the collecting chambers and a plurality of the output flow channels corresponding to the collecting chambers in number and connected correspondingly.
5. The 3D printing nozzle according to claim 1, wherein the backflow prevention device comprises a plurality of backflow prevention units connected end to end, wherein a scroll-type flow path for inhibiting backflow of the printing material can be formed inside each backflow prevention unit.
6. The 3D printing nozzle according to claim 5, wherein the backflow prevention unit is configured in a cone structure or a heart structure.
7. The 3D printing nozzle of claim 5, wherein the backflow prevention unit is configured as a valvular one-way channel structure.
8. The 3D printing head of claim 2, wherein the diameter of the volume outlet tube is smaller than the diameter of the collection chamber, and the diameter of the collection chamber is smaller than or equal to the diameter of the outlet flow channel.
9. A 3D printing head assembly, comprising a plurality of 3D printing heads according to any of claims 1 to 8 arranged side by side to each other.
10. A 3D printing method, wherein the 3D printing method is performed by the 3D printing nozzle of any one of claims 1 to 8 or the 3D printing nozzle assembly of claim 9, the 3D printing method comprising:
installing the 3D printing nozzle on a 3D printer, and correspondingly connecting an external material cylinder and a pressure control device with the 3D printing nozzle;
planning a printing path of a three-dimensional structure to be printed and a material to be printed to generate a path file;
and setting control pressure according to the characteristics of the printing materials in each material conveying channel to regulate and control the wire discharging speed, so that the output printing wires have the required shapes and the set diameters, and finally finishing printing.
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