CN110497614A - A kind of showering spray head and corresponding Method of printing for 3D printing equipment - Google Patents
A kind of showering spray head and corresponding Method of printing for 3D printing equipment Download PDFInfo
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- CN110497614A CN110497614A CN201910137024.4A CN201910137024A CN110497614A CN 110497614 A CN110497614 A CN 110497614A CN 201910137024 A CN201910137024 A CN 201910137024A CN 110497614 A CN110497614 A CN 110497614A
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- showering
- printing
- knife
- spray head
- raw material
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- 238000007639 printing Methods 0.000 title claims abstract description 85
- 238000010146 3D printing Methods 0.000 title claims abstract description 39
- 239000007921 spray Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000002386 leaching Methods 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000003283 slot draw process Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000016 photochemical curing Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
- B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
- B29C64/135—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask the energy source being concentrated, e.g. scanning lasers or focused light sources
-
- 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
-
- 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
- B33Y10/00—Processes of additive manufacturing
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Coating Apparatus (AREA)
Abstract
The present invention provides a kind of showering spray heads and corresponding Method of printing for 3D printing equipment, comprising: showering chamber, showering chamber is cavity body structure, its side is equipped with the feed inlet for printing raw material introducing, slit is formed on its bottom, around slit, the bottom of showering chamber is fixed with the connecting plate for connecting showering chamber；Showering knife, the number of showering knife are 2, one be short showering knife, it is another be long showering knife；Two showering knives are both secured to the lower section of connecting plate, and are respectively arranged at the two sides of slit；Tensioner component, tensioner component include multiple tightening pieces, and multiple tightening pieces are all set in the outside of one of showering knife.Showering showering spray head provided by the invention, when carrying out 3D printing using it, it will print in raw material showering to web plate, and directly printing layer of feed stock material can be paved, avoid the operation of doctor blade, it is i.e. printable after showering, the efficiency of 3D printing is effectively improved, there is extensive market application prospect.
Description
Technical field
The present invention relates to a kind of showering spray heads and corresponding Method of printing for 3D printing equipment.
Background technique
3D printing is a kind of printing speed forming technique, currently, 3D printing technique has been popularized in industrialized production manufacture；
, by Product Digitalization Design, manufacture, analysis very high integrity, the product that structure is complicated, raw material added value is high is fast for it
The advantage that speed efficiently shapes is more significant.
When 3D printing equipment prints, needs that the threedimensional model of printed matter is first carried out software slice, form several numbers
Slice, then printing raw material, curing molding accordingly will successively be stacked according to these slice informations by 3D printing；Institute is folded
After some digital slices, the printed matter that printing is completed is formed, printing is completed；Print the thickness and each layer of printed matter of raw material
Thickness is corresponding, therefore, during 3D printing, it usually needs will be printed after raw material strike off, then printed using scraper.
Chinese patent 201510234338.8 discloses a kind of rapid photocuring spray head for 3D printing equipment, mainly includes
Photocuring nozzle housing, barrel portion, point light source part, reflective mirror angle frame lifting part, wherein barrel portion mainly include
Barrel, the dispensing needle head for being connected to barrel bottom end, the barrel lid set on barrel top, point light source part mainly include laser point light
Source, light source fixing frame, reflective mirror fixed frame, reflective mirror angle frame, reflective mirror angle frame lifting part mainly include screw rod, adjust
Knob, slideway, sliding block, screw.
Chinese patent 201810104598.7 discloses a kind of Stereolithography equipment, including liquid storage cylinder, and storage is for beating
Print the raw material of three-dimension object；Liquid device is spread, paving liquid device is located above liquid storage cylinder and can carry out horizontal fortune on working face
Dynamic, paving liquid device is equipped with the spray head of injection liquid, and at least one scraper for paving liquid；Substrate is placed in liquid storage
It in cylinder, and can be in vertical motion on liquid storage cylinder, so that drive substrate is transported downwards in one layer of three-dimension object printing of every completion
Dynamic pre-determined distance.
Print procedure is improved in above scheme, but still does not avoid that raw material will be printed using scraper completely
The step of striking off, and during using doctor blade printing layer of feed stock material, after every one layer of printing, it is required to adjustment web plate
Highly, then after striking off, next layer, in-between process duration, the bonding being unfavorable between each layer of printed matter, shadow could be printed
The mechanical property of printed matter is rung, while the raising of printing effect is also by great limitation.
Therefore, how to provide and a kind of without doctor blade and can be improved the showering spray head of 3D printing efficiency and corresponding
Method of printing becomes industry problem to be solved.
Summary of the invention
In view of the shortcomings of the prior art, the object of the present invention is to provide a kind of showering spray heads and phase for 3D printing equipment
The Method of printing answered in print procedure, does not need to print layer of feed stock material using doctor blade, greatly improves the effect of 3D printing
Rate.
To achieve the goals above, of the invention, on the one hand, a kind of showering spray head for 3D printing equipment is provided,
Include:
For putting the showering chamber of printing raw material, showering chamber is cavity body structure, and side is equipped with for printing raw material
The slit for drenching out for printing raw material is formed on the feed inlet of introducing, bottom, surrounds slit, and the bottom fixation of showering chamber is set
There is the connecting plate for connecting showering chamber；
Showering knife, the number of showering knife are 2, one be short showering knife, it is another be long showering knife；Two showering knives are solid
Due to the lower section of connecting plate, and it is respectively arranged at the two sides of slit；
Tensioner component, tensioner component include multiple tightening pieces, and multiple tightening pieces are all set in the outer of one of showering knife
Side.
In the present invention, by being pumped into printing raw material to showering is intracavitary, then pass through the slit in showering bottom of chamber portion, so that printing
The downward showering of raw material goes out；Further, in order to ensure that printing raw material showering is uniform, meet the thickness needed, under slit
Side is set there are two the showering knife being oppositely arranged, and is drained to printing raw material, it is ensured that printing raw material are with certain thickness stream
Out, it is not easy agglomerating and aggregation；Meanwhile tensioner component, drainage process is further managed.
Showering showering spray head provided by the invention, when carrying out 3D printing using it, by printing raw material showering to web plate
On, and can directly pave printing layer of feed stock material, the operation of doctor blade is avoided, it is i.e. printable after showering, effectively mention
The efficiency of high 3D printing；In 3D printing field, there is great progradation, tool to the printing effect for improving 3D printing equipment
There is extensive market application prospect.
Another specific embodiment according to the present invention, showering chamber are plate structure, and leading flank is inclined plate, trailing flank is
Riser.By side inclined plate, the design of side riser enables printing raw material with the drainage of inclined plate, drenches along inclined plate
Out, play the role of buffering out to drenching for raw material of printing, further ensure that the uniform showering of printing raw material.
Another specific embodiment according to the present invention, the lower section of inclined plate are equipped with extension board, extension board and riser for slit
Stretching forms narrow-gap channel；Extend printing raw material and drench guidance out in vertical direction, ensures printing raw material with preset thickness
Degree drenches out.Riser and connecting plate are integrally formed, and extension board passes through the centre of connecting plate and is fixedly connected with connecting plate.Inclined plate and
Extension board is integrally formed, and is drained to printing raw material, is avoided the connection with connecting plate, form rough surface, it is former to influence printing
The leaching of material goes out effect.
Another specific embodiment according to the present invention, tensioner component are set to the outside of short showering knife.To showering knife
It is whole to carry out tensioner, control the precision of drainage.
Another specific embodiment according to the present invention, the both ends of slit are equipped with drainage plate, and drainage plate is fixed on connection
On plate；Drainage plate is laminated structure, and width is greater than the width of slit.Drainage plate include three sections of bending parts, from top to bottom for, to
Flare inclined portion, lean-in inclined portion, vertical portion, outwardly angled sections make (at the both ends including slit) printing former material of any position
Material freely drenches out, and lean-in inclined portion makes the printing raw material at both ends with certain buffering, avoids spreading, meanwhile, to drenching out
The width of printing raw material is effectively managed, and vertical portion makes printing raw material, and stable showering downwards is extremely in the vertical direction
On web plate.
Another specific embodiment according to the present invention, length and the web plate width in 3D printing equipment of slit are mutually fitted
It answers；The thickness printed during the width of slit and 3D printing is adapted.
Another specific embodiment according to the present invention, showering spray head further include air knife, and the number of air knife is two, two
Air knife passes through the two sides that linking arm is fixed on connecting plate respectively.
Another aspect of the present invention additionally provides a kind of Method of printing that 3D printing is carried out at using above-mentioned showering spray head,
It includes the following steps:
S1 pumps showering chamber connecting material, and it is intracavitary that the printing raw material for being used for 3D printing are pumped into showering by material pump；
S2, the height for adjusting web plate drive showering chamber mobile from front to back primary on web plate, the mobile process of showering chamber
In, printing raw material drench out from showering is intracavitary, form a layer thickness and uniformly print layer of feed stock material；
The laser of S3, laser membrane module transmitting preset wavelength are sintered printing layer of feed stock material according to preset path, complete one
The printing of layer；
S4, it repeats the above steps, until printed matter printing is completed.
Another specific embodiment according to the present invention, the thickness of the printing layer of feed stock material of showering, by controlling showering chamber
Slit width be adjusted.
Another specific embodiment according to the present invention further comprises following steps: beating during carrying out step S2
During printing raw material showering, the foam printed in raw material is removed by air knife and paves printing layer of feed stock material.
The present invention is described in further detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the showering spray head for 3D printing equipment of embodiment 1；
Fig. 2 is another structural schematic diagram of the showering spray head for 3D printing equipment of embodiment 1；
Fig. 3 is the showering spray head diagrammatic cross-section for 3D printing equipment of embodiment 1；
Fig. 4 is the installation connection schematic diagram of the showering spray head for 3D printing equipment of embodiment 1；
Fig. 5 is another installation connection schematic diagram of the showering spray head for 3D printing equipment of embodiment 1.
Specific embodiment
Embodiment 1
A kind of showering spray head for 3D printing equipment is present embodiments provided, as shown in Figs. 1-5 comprising: for filling
Put showering chamber 1, showering knife, tensioner component 4, the air knife 6 of printing raw material.
Showering chamber 1 is cavity body structure, and side is equipped with the feed inlet 104 for printing raw material introducing, and bottom is formed
The slit for drenching out for printing raw material surrounds slit, and the bottom of showering chamber 1 is fixed with the company for connecting showering chamber 1
Fishplate bar 2；Showering chamber 1 is plate structure, and leading flank is inclined plate 102, trailing flank is riser 101.By side inclined plate 102, one
The design of side riser 101 enables printing raw material with the drainage of inclined plate 102, drenches out along inclined plate 102, former to printing
Buffering is played the role of in drenching for material out, further ensures that the uniform showering of printing raw material.
The lower section of inclined plate 102 is equipped with extension board 103, and slot draw is formed narrow-gap channel by extension board 103 and riser 101；
Extend printing raw material and drench guidance out in vertical direction, ensures that printing raw material are drenched out with preset thickness.Riser 101 and company
Fishplate bar 2 is integrally formed, and extension board 103 passes through the centre, concordant with the bottom of connecting plate 2 of connecting plate 2.Inclined plate 102 and extension board
103 are integrally formed, and drain to printing raw material, avoid the connection with connecting plate 2, form rough surface, influence to print former material
The leaching of material goes out effect.
The both ends of slit are equipped with drainage plate 8, and drainage plate 8 is fixed on connecting plate 2；Drainage plate 8 is laminated structure, wide
Degree is greater than the width of slit.Drainage plate 8 includes three sections of bending parts, is from top to bottom, outwardly angled sections, lean-in inclined portion, vertically
Portion, outwardly angled sections drench (at the both ends including slit) printing raw material of any position freely out, and lean-in inclined portion makes
The printing raw material at both ends have certain buffering, avoid spreading, meanwhile, the width for drenching printing raw material out is carried out effective
Control, vertical portion to print raw material in the vertical direction in stable showering to web plate downwards.Raw material are printed from slit
After the outflow of channel, by the drainage of drainage plate 8, water curtain in homogeneous thickness is formed, is evenly coated on web plate.
The length of slit and the web plate width in 3D printing equipment are adapted；It is printed during the width of slit and 3D printing
Thickness be adapted.
Showering knife, the number of showering knife are 2, one be short showering knife 301, it is another be long showering knife 302；Two showerings
Knife is both secured to the lower section of connecting plate 2, and is respectively arranged at the two sides of slit；
Tensioner component 4, tensioner component 4 include multiple tightening pieces 401, and multiple tightening pieces 401 are all set in one of leaching
The outside for applying knife in the present embodiment, is set to the outside of short showering knife 301.Tensioner component 4 is set to the outer of short showering knife 301
Side.Tensioner is carried out to the whole of showering knife, controls the precision of drainage.
Air knife 6, the number of air knife 6 are two, and two air knives 6 are fixed on connecting plate 2 by linking arm 601901 respectively
Two sides.Air knife 6 be used for blow away leaching come out printing raw material in bubble, further increase printing raw material showering uniformly,
It is smooth.
When being printed using the showering spray head of the present embodiment, need to control the side of movement and the movement of showering spray head
To speed etc., showering guide pad 5 can be set in the two sides of connecting plate 2, convenient for the mobile control of showering spray head.Also, showering is sprayed
Head is mobile in the top of web plate, the mounting rack 9 and cantilever 901 for fixing showering spray head is also provided with, for fixing showering
Spray head, and Slidable is installed on the top of web plate.
The another aspect of the present embodiment additionally provides a kind of printing side that 3D printing is carried out at using above-mentioned showering spray head
Method comprising following steps:
S1 pumps showering chamber connecting material, and it is intracavitary that the printing raw material for being used for 3D printing are pumped into showering by material pump；
S2, the height for adjusting web plate drive showering chamber mobile from front to back primary on web plate, the mobile process of showering chamber
In, printing raw material drench out from showering is intracavitary, form a layer thickness and uniformly print layer of feed stock material；
The laser of S3, laser membrane module transmitting preset wavelength are sintered printing layer of feed stock material according to preset path, complete one
The printing of layer；
S4, it repeats the above steps, until printed matter printing is completed.
The thickness of the printing layer of feed stock material of showering, the slit width by controlling showering chamber are adjusted.
Further comprise following steps during carrying out step S2: during printing raw material showering, passing through air knife
The foam printed in raw material is removed and paves printing layer of feed stock material.
Although the present invention is disclosed above in the preferred embodiment, it is not intended to limit the invention the range of implementation.Any
The those of ordinary skill in field is not departing from invention scope of the invention, improves when can make a little, i.e., all according to this hair
Bright done same improvement, should be the scope of the present invention and is covered.
Claims (10)
1. a kind of showering spray head for 3D printing equipment, which is characterized in that the showering spray head includes:
For putting the showering chamber of printing raw material, the showering chamber is cavity body structure, and side is equipped with for printing raw material
The slit for drenching out for printing raw material is formed on the feed inlet of introducing, bottom, surrounds the slit, the bottom of the showering chamber
Portion is fixed with the connecting plate for connecting the showering chamber；
Showering knife, the number of the showering knife are 2, one be short showering knife, it is another be long showering knife；Two showering knives
It is both secured to the lower section of the connecting plate, and is respectively arranged at the two sides of the slit；
Tensioner component, the tensioner component include multiple tightening pieces, and multiple tightening pieces are all set in one of them described leaching
Apply the outside of knife.
2. showering spray head as described in claim 1, which is characterized in that the showering chamber is plate structure, and leading flank is oblique
Plate, trailing flank are riser.
3. showering spray head as claimed in claim 2, which is characterized in that the lower section of the inclined plate is equipped with extension board, the extension
The slot draw is formed narrow-gap channel with the riser by plate.
4. showering spray head as described in claim 1, which is characterized in that the tensioner component is set to the outer of the short showering knife
Side.
5. showering spray head as described in claim 1, which is characterized in that the both ends of the slit are equipped with drainage plate, described to draw
Flowing plate is fixed on the connecting plate；The drainage plate is laminated structure, and width is greater than the width of slit.
6. showering spray head as described in claim 1, which is characterized in that the length of the slit and the web plate in 3D printing equipment
Width is adapted；The thickness printed during the width of the slit and 3D printing is adapted.
7. showering spray head as described in claim 1, which is characterized in that the showering spray head further includes air knife, the air knife
Number is two, and two air knives pass through the two sides that linking arm is fixed on the connecting plate respectively.
8. a kind of Method of printing for being carried out at 3D printing using the showering spray head as claimed in claim 1 to 7, which is characterized in that
The Method of printing includes the following steps:
S1 pumps showering chamber connecting material, and it is intracavitary that the printing raw material for being used for 3D printing are pumped into showering by material pump；
S2, the height for adjusting web plate drive showering chamber mobile from front to back primary on web plate, during showering chamber is mobile,
Printing raw material drench out from showering is intracavitary, form a layer thickness and uniformly print layer of feed stock material；
The laser of S3, laser membrane module transmitting preset wavelength are sintered printing layer of feed stock material according to preset path, complete one layer
Printing；
S4, it repeats the above steps, until printed matter printing is completed.
9. Method of printing as claimed in claim 8, which is characterized in that in the step S2, the printing layer of feed stock material of showering
Thickness, the slit width by controlling showering chamber are adjusted.
10. Method of printing as claimed in claim 8, which is characterized in that during carrying out the step S2, further comprise
Following steps: during printing raw material showering, the foam printed in raw material is removed by air knife and paves printing original
Material layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129600 | 2019-02-21 | ||
| CN2019101296000 | 2019-02-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110497614A true CN110497614A (en) | 2019-11-26 |
| CN110497614B CN110497614B (en) | 2024-05-10 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910137024.4A Active CN110497614B (en) | 2019-02-21 | 2019-02-25 | Shower nozzle for 3D printing equipment and corresponding printing method |
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| CN (1) | CN110497614B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113427760A (en) * | 2021-07-14 | 2021-09-24 | 内蒙古工业大学 | 3D prints shower nozzle and 3D printing device |
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| CN108454098A (en) * | 2018-02-02 | 2018-08-28 | 湖南华曙高科技有限责任公司 | Stereolithography equipment |
| CN208303144U (en) * | 2018-03-26 | 2019-01-01 | 韩锦永 | curtain coater |
| CN108357101A (en) * | 2018-04-08 | 2018-08-03 | 浙江大学 | A kind of environment-friendly type powder 3D printer |
| CN110497615A (en) * | 2019-02-21 | 2019-11-26 | 广州捷和电子科技有限公司 | A kind of showering formula 3D printing equipment |
| CN209971550U (en) * | 2019-02-21 | 2020-01-21 | 广州捷和电子科技有限公司 | Curtain coating type 3D printing equipment |
| CN209971549U (en) * | 2019-02-21 | 2020-01-21 | 广州捷和电子科技有限公司 | A drench scribble shower nozzle for 3D printing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113427760A (en) * | 2021-07-14 | 2021-09-24 | 内蒙古工业大学 | 3D prints shower nozzle and 3D printing device |
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