CN110370623A - A kind of 3D printing equipment - Google Patents
A kind of 3D printing equipment Download PDFInfo
- Publication number
- CN110370623A CN110370623A CN201910695970.0A CN201910695970A CN110370623A CN 110370623 A CN110370623 A CN 110370623A CN 201910695970 A CN201910695970 A CN 201910695970A CN 110370623 A CN110370623 A CN 110370623A
- Authority
- CN
- China
- Prior art keywords
- wind
- conducting pipe
- heat conducting
- groove body
- guiding groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- B29C64/10—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
- B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
-
- 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
-
- 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
- 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
- B29C64/295—Heating elements
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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
- 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
Abstract
The invention belongs to 3D printing technique technical fields, more particularly to a kind of 3D printing equipment, the spray head in radiating sleeve be equipped with passage, heating component is installed on the spray head, the heating component is connected with insulating assembly, the insulating assembly is fixedly connected with radiating sleeve, the radiating sleeve includes heat conducting pipe and multiple wind-collecting covers, multiple wind-collecting covers are axially all set on heat conducting pipe, the wind-collecting cover is tapered to be fixed on the excircle of heat conducting pipe, wind-guiding groove body is offered below the wind-collecting cover of lowermost end, the open end of the wind-guiding groove body is upward, air hose is installed on the wind-guiding groove body, inclination that the air outlet of air hose is located in wind guide tank body and Open Side Down, heat conducting pipe top is equipped with fixed plate, first fixed plate is fixedly installed in the lower end of fixed plate by screw, the input end fixation of the air hose is arranged in In fixed plate, air hose input end is circumscribed with blower.The purpose is to: solve the problems, such as the difficulty of wire feed caused by existing 3D printing apparatus structure defect.
Description
Technical field
The invention belongs to 3D printing engineering device technique fields, and in particular to a kind of 3D printing equipment.
Background technique
Molten copper infiltration is current with the fastest developing speed, most promising 3D printing rapid shaping technique.Fuse deposition
Molding working principle be by heat-fusible materials, such as ABS, first pass through heater fusing be pumped into filiform after, FDM molding equipment passes through
Filamentous printed material is sent into hot melt spray head by wire feeder, thawing is heated in spray head, spray head is along part section profile and fills out
Track movement is filled, the material of half flow regime is squeezed out according to the path that converted products CAD individual-layer data controls and is deposited on finger
Fixed position solidification forming, and bonded with the material of surrounding, layer upon layer molding.Each synusia is in upper one layer upper accumulation
It forms, upper one layer is played the role of positioning and support to current layer, so the techniques such as FDM are referred to as 3D printing forming technique.It is molten
The material of silk extrusion molding (FDM) technique is usually thermoplastic material, is fed by wire feeder with filiform.
Molten copper infiltration mechanism includes three-axis moving mechanism, wire feeder, printing head and control mechanism.Wherein, it send
Filamentous printed material is sent into printing head thawing by motor and printed by silk structure；Heating device in printing head will
The Filamentous printed material that wire feeder is sent into is heated to fuse state, then squeezes out under the extruding force of the non-melted material of wire feeder
Printing head is deposited on one layer of product and is cooled and shaped.
Currently, the 3D printer based on FDM technology frequently encounters the problem of wire rod expansion results in blockage in use,
It traces it to its cause and essentially consists in, melt at spray head hot end after plastic wire is heated, simultaneously because the effect of heat transfer, heat can be with
Wire rod is communicated up, and the wire rod above hot end is caused to expand, and generates huge frictional force with liner after wire rod expansion, causes wire feed tired
Difficult problem.
Summary of the invention
The purpose of the present invention is: it is intended to provide a kind of 3D printing equipment, for solving existing 3D printing apparatus structure defect
The problem of caused wire feed difficulty.
To realize the above-mentioned technical purpose, The technical solution adopted by the invention is as follows:
A kind of 3D printing equipment, including the radiating sleeve being mounted on above spray head, the spray head in radiating sleeve be equipped with guide
It manages, heating component is installed on the spray head, the heating component is connected with insulating assembly, and the insulating assembly and radiating sleeve are solid
Fixed connection, the spray head are also connected with passage, and the radiating sleeve and insulating assembly are set on passage, the radiating sleeve
Including heat conducting pipe and multiple wind-collecting covers, multiple wind-collecting covers are axially uniformly arranged along heat conducting pipe, and the wind-collecting cover is tapered solid
Due on the excircle of heat conducting pipe, offering wind-guiding groove body, the wind-guiding groove body below the wind-collecting cover of lowermost end
Open end upward, air hose is installed on the wind-guiding groove body, the air outlet of the air hose be located in wind guide tank body and be open to
Lower inclination, the heat conducting pipe top are equipped with fixed plate, wherein offer mounting hole in fixed plate, is equipped on heat conducting pipe
One fixed plate, the heat conducting pipe top are arranged in mounting hole, and the first fixed plate is fixedly installed under fixed plate by screw
The input end fixation at end, the air hose is arranged in fixed plate, wherein the second fixed plate is equipped on air hose, described second is solid
Fixed board is installed on fixed plate bottom end by screw, and the air hose input end is circumscribed with blower.
The present invention is also made that following improvement based on the above technical solution:
Further, fixing seat is installed, stationary annular is kept out the wind in the fixing seat between the insulating assembly and heat conducting pipe
Plate, the annular wind deflector are located at the lower part of wind-guiding groove body, the company of being fixedly installed between the annular wind deflector and wind-guiding groove body
Connect column.Showerhead region is blocked under the action of wind deflector, prevents radiation air derived from air hose straight after wind-collecting cover
It connects and blows in work part, the molding of part is impacted.
Further, the V-shaped structure of section of the annular wind deflector.Change airflow direction by v-shaped structure, it can be better
Prevent air hose outlet air from impacting to forming part.
Further, integrally formed with auxiliary heat dissipation plate on the wind-collecting cover, the auxiliary heat dissipation plate tilts upward setting.Have
The increase heat dissipation area of effect is conducive to improve radiating efficiency.
Further, integrally formed with wind guide and heat dispersion plate on the auxiliary heat dissipation plate, the wind guide and heat dispersion plate, which tilts down, to be set
It sets, offers through-hole on the auxiliary heat dissipation plate.Increasing heat radiation area again, while cooperation auxiliary heat dissipation plate carries out air-flow
Guiding dissipates radiation air to auxiliary heat dissipation plate and wind-guiding by that can flow directly down when auxiliary heat dissipation plate and wind guide and heat dispersion plate
The outer surface of hot plate is radiated, simultaneously because the presence of through-hole, part radiation air enters to auxiliary heat dissipation plate from through-hole from through-hole, leads
The inner surface of wind heat sink and wind-collecting cover radiates, and accelerates radiating rate, improves radiating efficiency.
Further, accommodating chamber is offered in the heat conducting pipe, is filled with thermal grease layer, the receiving in the accommodating chamber
Chamber top is fixedly installed with sealing plate.Accelerate heat transmitting by thermal grease layer, is conducive to preferably improve radiating efficiency.
Further, thermistor is equipped between the fixing seat and heat conducting pipe, the thermistor and fans in series are in electricity
On the road, when the temperature increases, the resistance value of thermistor reduces, and the electric current for flowing through thermistor and blower increases, the normal work of blower
Make, blower cools down to radiating sleeve；When the temperature decreases, the resistance value of thermistor increases, and flows through thermistor and blower
Electric current reduces, and the revolving speed of blower is slack-off, reduces to radiating sleeve heat dissipation effect, saves electric energy.
Further, drainage lumens are equipped in the wind guide tank body, the open end of the air hose is obliquely installed towards drainage lumens.Heat dissipation
Wind is first blown into drainage lumens to be dispersed along drainage lumens, is finally blown out again from wind guide tank body, the wind energy that makes to radiate it is more evenly dispersed to
Convenient for carrying out more uniform heat dissipation to radiating sleeve.
Invention by adopting the above technical scheme, has the advantages that
1, the lower end of passage temperature close at spray head is higher compared with upper end, and the present invention is led by the setting in the lower end of passage
Wind groove body makes passage lower end surrounding air flow faster, is conducive to quickly take away heat, avoids wire rod expansion blockage；
2, the design of auxiliary heat dissipation plate and wind guide and heat dispersion plate, increasing heat radiation area while not influencing space hold, mentions
High radiating rate, while the wind energy that makes to radiate in the design of through-hole is simultaneously to the outer of wind-collecting cover, auxiliary heat dissipation plate and wind guide and heat dispersion plate
Surface and inner surface radiate, and radiating efficiency is higher.
Detailed description of the invention
The present invention can be further illustrated by the nonlimiting examples that attached drawing provides；
Fig. 1 is a kind of structural schematic diagram one of 3D printing apparatus embodiments of the present invention；
Fig. 2 is a kind of structural schematic diagram two of 3D printing apparatus embodiments of the present invention；
Fig. 3 is a kind of schematic cross-sectional view of 3D printing apparatus embodiments of the present invention；
Fig. 4 is the enlarged structure schematic diagram in Fig. 3 at A；
Main element symbol description is as follows:
Fixed plate 1, mounting hole 11, passage 22, radiating sleeve 2, heat conducting pipe 21, the first fixed plate 211, passage 22, spray
First 221, air hose 3, heating component 41, fixing seat 51, annular wind deflector 52, wind-guiding groove body 6, wind-collecting cover 71, auxiliary heat dissipation plate 72,
Through-hole 73, wind guide and heat dispersion plate 74.
Specific embodiment
In order to make those skilled in the art that the present invention may be better understood, with reference to the accompanying drawings and examples to this hair
Bright technical solution further illustrates.
As shown in Figure 1 to 4, a kind of 3D printing equipment of the invention, the radiating sleeve 2 including being mounted on 221 top of spray head,
Spray head 221 is equipped with heating component 41 on spray head 221, heating component 11 is connected with heat-insulated in being equipped with passage 22 in radiating sleeve 2
Component 42, insulating assembly 42 are fixedly connected with radiating sleeve 2, and spray head 221 is also connected with passage 22, radiating sleeve 2 and insulating assembly
42 are set on passage 22, and radiating sleeve 2 includes heat conducting pipe 21 and multiple wind-collecting covers 71, and multiple wind-collecting covers 71 are along heat conducting pipe 21
It is axially uniformly arranged, on the tapered excircle for being fixed on heat conducting pipe 21 of wind-collecting cover 71, under the wind-collecting cover 71 of lowermost end
Side offers wind-guiding groove body 6, and the open end of wind-guiding groove body 6 upward, is equipped with air hose 3, the air outlet of air hose 3 on wind-guiding groove body 6
In wind-guiding groove body 6 and Open Side Down inclination, 21 top of heat conducting pipe is equipped with fixed plate 1, wherein offers in fixed plate 1
Mounting hole 11 is equipped with the first fixed plate 211 on heat conducting pipe 21, and 21 top of heat conducting pipe is arranged in mounting hole 11, and first is fixed
Plate 211 is fixedly installed in the lower end of fixed plate 1 by screw, and the input end fixation of air hose 3 is arranged in fixed plate 1, wherein wind
Second fixed plate 31 is installed, the second fixed plate 31 is installed on 1 bottom end of fixed plate by screw, outside 21 input end of air hose on pipe 3
It is connected to blower.
Specifically, fixing seat 51 is installed between insulating assembly 42 and heat conducting pipe 21, is fixedly installed with ring in fixing seat 51
Shape wind deflector 52, annular wind deflector 52 are located at the lower section of wind-guiding groove body 6, fixed peace between annular wind deflector 52 and wind-guiding groove body 6
Equipped with connecting column 61.221 region of spray head is blocked under the action of wind deflector, prevents radiation air derived from air hose 3 from passing through
It crosses after wind-collecting cover 71 and directly blows in work part, the molding of part is impacted, wherein the section of annular wind deflector 52 is in V
Shape structure.Change airflow direction by v-shaped structure, can preferably prevent 3 outlet air of air hose from impacting to forming part.
Specifically, integrally formed with auxiliary heat dissipation plate 72 on wind-collecting cover 71, auxiliary heat dissipation plate 72 tilts upward setting, can
It is effective to increase heat dissipation area, be conducive to improve radiating efficiency.Integrally formed with wind guide and heat dispersion plate 74 on auxiliary heat dissipation plate 72, lead
Wind heat sink 74 tilts down setting, and through-hole 73 is offered on auxiliary heat dissipation plate 72, further increases heat dissipation area, while to matching
It closes auxiliary heat dissipation plate 72 to be oriented to air-flow, makes radiation air can be direct when by auxiliary heat dissipation plate 72 and wind guide and heat dispersion plate 74
The outer surface heat dissipation to flow downward to auxiliary heat dissipation plate 72 and wind guide and heat dispersion plate 74, simultaneously because the presence of through-hole 73, part dissipates
Hot wind enters from through-hole 73 from through-hole radiates to the inner surface of auxiliary heat dissipation plate 72, wind guide and heat dispersion plate 74 and wind-collecting cover 71,
Accelerate radiating rate, improves radiating efficiency
Specifically, accommodating chamber 23 is offered in heat conducting pipe 21, thermal grease layer is filled in accommodating chamber 23, and accommodating chamber 23 is pushed up
End is fixedly installed with sealing plate 231.Accelerate heat transmitting by thermal grease layer, is conducive to preferably improve radiating efficiency.
Specifically, between fixing seat 51 and heat conducting pipe 21 be equipped with thermistor, thermistor and fans in series on circuit,
When the temperature increases, the resistance value of thermistor reduces, and the electric current for flowing through thermistor and blower increases, and blower works normally, wind
Machine cools down to radiating sleeve；When the temperature decreases, the resistance value of thermistor increases, and the electric current for flowing through thermistor and blower subtracts
Small, the revolving speed of blower is slack-off, reduces to radiating sleeve heat dissipation effect, saves electric energy.
Specifically, drainage lumens 62 are equipped in wind-guiding groove body 6, the open end of air hose 3 is obliquely installed towards drainage lumens 62.Radiation air
First be blown into drainage lumens 62 and disperse along drainage lumens 62, finally blown out again from wind guide tank body 6, the wind energy that makes to radiate it is more evenly dispersed from
And is conducive to radiating sleeve 2 and carries out more uniform heat dissipation.
In the present embodiment, fixed plate 1 is installed in the mobile mould group with 3D printer, while by the feed of 3D printer
Pipe is connect with passage 22.Filamentary material for printing passes through passage 22 and reaches insulating assembly 42, passes through insulating assembly 42
The spray head 1 in heating component 41 is reached, the filamentary material for printing is melted into liquid under the action of heating component 41, melts
Material silk squeezed out by spray head 1, spray head 1 squeezes out semifluid heat-stabilized wood along the profile accurate motion in each section of part
Expect deposition cure at accurate physical unit thin layer, be covered on the part built, and quick solidification, it is every complete one layer at
The workbench of type, 3D printer declines a layer height, and spray head 1 carries out the scanning spinneret of next layer cross section again, repeatedly successively
Deposition, successively by bottom to top is piled into physical model or a part, wherein beat in printer in this way by the last one layer
During printing work, blower is blown by air hose 3 into wind guide tank body 6, and radiation air is first blown into drainage lumens 62 along drainage lumens
62 dispersions finally blow out upwards from wind guide tank body 6 again, radiation air pair are introduced under the action of wind-collecting cover 71, auxiliary heat dissipation plate 72
The outer wall of auxiliary heat dissipation plate 72 and wind guide and heat dispersion plate 74 radiates, simultaneously because the presence of through-hole 73, part radiation air is certainly logical
Hole 73 enters from through-hole radiates to the inner surface of auxiliary heat dissipation plate 72, wind guide and heat dispersion plate 74 and wind-collecting cover 71, finally radiates
Wind along wind guide and heat dispersion plate 74, again radiate to the outer wall of wind-collecting cover 71 downwards by blowout, accelerates the radiating rate of radiating sleeve 2.
A kind of 3D printing equipment provided by the invention is described in detail above.The explanation of specific embodiment is only used
In facilitating the understanding of the method and its core concept of the invention.It should be pointed out that for those skilled in the art,
Without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention, these improvement and modification
It falls into the protection scope of the claims in the present invention.
Claims (8)
1. a kind of 3D printing equipment is equipped on the spray head (221) including the radiating sleeve (2) being mounted on above spray head (221)
Heating component (41), the heating component (11) are connected with insulating assembly (42), and the insulating assembly (42) and radiating sleeve (2) are solid
Fixed connection, the spray head (221) are also connected with passage (22), and the radiating sleeve (2) and insulating assembly (42) are set in and lead
In expects pipe (22), it is characterised in that: the radiating sleeve (2) includes heat conducting pipe (21) and multiple wind-collecting covers (71), multiple collection
Fan housing (71) is axially uniformly arranged along heat conducting pipe (21), the tapered excircle for being fixed on heat conducting pipe (21) of wind-collecting cover (71)
On, it is offered wind-guiding groove body (6) below the wind-collecting cover (71) of lowermost end, the open end of the wind-guiding groove body (6)
Upward, it is equipped with air hose (3) on the wind-guiding groove body (6), the air outlet of the air hose (3) is located in wind-guiding groove body (6) and opens
Mouth tilts down, and heat conducting pipe (21) top is equipped with fixed plate (1), and the input end of the air hose (3) is fixed to be arranged in admittedly
On fixed board (1), air hose (21) input end is circumscribed with blower.
2. a kind of 3D printing equipment according to claim 1, it is characterised in that: the insulating assembly (42) and heat conducting pipe
(21) it is equipped between fixing seat (51), stationary annular wind deflector (52) on the fixing seat (51), the annular wind deflector
(52) it is located at the lower part of wind-guiding groove body (6), is fixedly installed with connecting column between the annular wind deflector (52) and wind-guiding groove body (6)
(61)。
3. a kind of 3D printing equipment according to claim 2, it is characterised in that: it is described annular wind deflector (52) section be in
V-shaped structure.
4. a kind of 3D printing equipment according to claim 1, it is characterised in that: on the wind-collecting cover (71) integrally formed with
Auxiliary heat dissipation plate (72), the auxiliary heat dissipation plate (72) tilt upward setting.
5. a kind of 3D printing equipment according to claim 4, it is characterised in that: on the auxiliary heat dissipation plate (72) integrally at
Type has wind guide and heat dispersion plate (74), and the wind guide and heat dispersion plate (74) tilts down setting, offers on the auxiliary heat dissipation plate (72)
Through-hole (73).
6. a kind of 3D printing equipment according to claim 1, it is characterised in that: offer receiving in the heat conducting pipe (21)
Chamber (23), the accommodating chamber (23) is interior to be filled with thermal grease layer, and accommodating chamber (23) top is fixedly installed with sealing plate
(231)。
7. a kind of 3D printing equipment according to claim 1, it is characterised in that: the fixing seat (51) and heat conducting pipe (21)
Between be equipped with thermistor, the thermistor and fans in series are on circuit.
8. a kind of 3D printing equipment according to claim 1, it is characterised in that: be equipped with drainage in the wind-guiding groove body (6)
The open end of chamber (62), the air hose (3) is obliquely installed towards drainage lumens (62).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910695970.0A CN110370623B (en) | 2019-07-30 | 2019-07-30 | 3D printing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910695970.0A CN110370623B (en) | 2019-07-30 | 2019-07-30 | 3D printing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110370623A true CN110370623A (en) | 2019-10-25 |
| CN110370623B CN110370623B (en) | 2021-09-28 |
Family
ID=68257015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910695970.0A Active CN110370623B (en) | 2019-07-30 | 2019-07-30 | 3D printing equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110370623B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113442433A (en) * | 2021-07-26 | 2021-09-28 | 山东工业职业学院 | 3D print head heat abstractor |
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| CN110370623B (en) | 2021-09-28 |
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