CN106915077A - A kind of three probe printing equipments for SLA 3D Stereolithographies - Google Patents

A kind of three probe printing equipments for SLA 3D Stereolithographies Download PDF

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Publication number
CN106915077A
CN106915077A CN201710112644.3A CN201710112644A CN106915077A CN 106915077 A CN106915077 A CN 106915077A CN 201710112644 A CN201710112644 A CN 201710112644A CN 106915077 A CN106915077 A CN 106915077A
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CN
China
Prior art keywords
resin
web plate
work nest
groove
stereolithographies
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.)
Pending
Application number
CN201710112644.3A
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Chinese (zh)
Inventor
江泽星
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Shenzhen Jinshi Three Dimensional Printing Technology Co Ltd
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Shenzhen Jinshi Three Dimensional Printing Technology Co Ltd
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Priority to CN201710112644.3A priority Critical patent/CN106915077A/en
Publication of CN106915077A publication Critical patent/CN106915077A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE 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
    • B33Y30/00Apparatus for additive manufacturing; Details thereof or accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE 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
    • B33Y50/00Data acquisition or data processing for additive manufacturing
    • B33Y50/02Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)

Abstract

The invention discloses a kind of three probe printing equipments for SLA 3D Stereolithographies, the printing equipment includes that frame main body, sweep mechanism, resin groove mechanism, drive mechanism, resin import pump and accommodate resin and the web plate mechanism being processed;Web plate mechanism and drive mechanism are installed in frame main body, and web plate mechanism and drive mechanism drive connection, and the work nest for being formed and accommodating resin is combined between web plate mechanism and the madial wall of frame main body;Sweep mechanism is located at the surface of work nest, and resin groove mechanism imports the input airtight connection of pump with resin, and the output end of resin importing pump is extended at processing groove top edges;Processing groove is turned on by complex root resin leak-off pipe with resin groove mechanism.Component combination can realize an automatic running overall so as to realize device in apparatus of the present invention, be recycled reciprocal production identical product, and production efficiency is high.

Description

A kind of three probe printing equipments for SLA 3D Stereolithographies
Technical field
The invention belongs to the technical field of 3D printing, more particularly to a kind of three probes for SLA 3D Stereolithographies Printing equipment.
Background technology
3D printing(3DP) be rapid shaping technique one kind, it be one kind based on mathematical model file, with powder Shape metal or plastics etc. can jointing material, come the technology of constructed object by way of successively printing.
3D printing is typically with digital technology file printing machine to realize.Often in the neck such as Making mold, industrial design Domain is used for modeling, after be gradually available for the direct manufacture of some products, had zero printed using this technology Part.The technology in jewelry, footwear, industrial design, building, engineering and construction, automobile, Aero-Space, dentistry and medical industries, Education, GIS-Geographic Information System, civil engineering, gun and other field have all been applied.
There are many defects in existing 3D printing technique:
1st, existing 3D printer is typically damaged just using the design of single sweep head, its inefficiency, and the first denier of single sweep Cannot normal work, and need it is overall replace, the service life of printer is shortened indirectly and manufacturing cost is increased;
2nd, the resin storage tank that existing 3D printer accommodates resin is all open, and such design easily uses process in long-time In cause resin to become damp and rotten, so as to influence printing effect, and very big waste is caused to resin;
3rd, existing 3D printer is commonly artificial and changes processing resin, once resin exhaustion cannot be automatic during 3D printing Supplement, so causes 3D printing persistently to carry out, and also limit its product continues a large amount of productions;
4th, existing 3D printer can produce trash matter in print procedure, and 3D printer does not have automatic fitration trash matter Device, during so causing 3D printing, trash matter is mixed into the middle of printout, cause finished product damage and influence into The quality of product.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of three probes for SLA 3D Stereolithographies Printing equipment, the printing equipment can solve the problem that above mentioned problem.
It is another object of the present invention to provide a kind of three probe printing equipments for SLA 3D Stereolithographies, The printing equipment high working efficiency, low cost of manufacture, final product quality are high and reduce the waste of resin.
To achieve the above object, technical scheme is as follows.
A kind of three probe printing equipments for SLA 3D Stereolithographies, the printing equipment includes frame main body, sweeps Retouch mechanism, resin groove mechanism, drive mechanism, resin importing pump and accommodate resin and the web plate mechanism being processed;The web plate Mechanism and drive mechanism are installed in frame main body, and web plate mechanism and drive mechanism drive connection, the web plate mechanism with The work nest for being formed and accommodating resin is combined between the madial wall of frame main body;The sweep mechanism is located at the surface of work nest, The resin groove mechanism is fixedly connected on the bottom of frame main body, and the resin groove mechanism is closed with the input that resin imports pump Connect, and the output end of resin importing pump is extended at processing groove top edges;The processing groove passes through complex root resin earial drainage Pipe and the conducting of resin groove mechanism;
The resin imports pump and imports in work nest the in-house resin of resin storage tank, and drive mechanism drives web plate mechanism to transport up and down Dynamic, while sweep mechanism is scanned processing, the resin that work nest is overflowed in process flows back to resin by resin leak-off pipe Groove mechanism.
The resin groove mechanism includes the inclined floor of resin storage tank, resin guide pipe, sole plate base and raising water conservancy diversion efficiency, The resin guide pipe is fixedly connected on the bottom of resin storage tank side;The inclined floor is arranged on the inside bottom of resin storage tank, And its inclined placement of support for passing through floor base, the end of the inclined floor is connected with resin guide pipe.
Further, it is additionally provided with liquid level sensor, and the upper wall of resin storage tank on the inner side upper wall of the resin storage tank and is opened Resin infusion mouthful is provided with, when liquid level sensor senses resin liquid level, resin infusion mouthful stops perfusion resin.
The sweep mechanism includes three probes, scanning galvanometer, beam expanding lens and laser head, what the laser head was emitted Laser beam is passed after passing sequentially through scanning galvanometer and beam expanding lens from three probes, is finally radiated on the resin in work nest.
The drive mechanism includes motor and piston cylinder, and the motor is arranged on inside frame main body, and is driven The input drive connection of dynamic motor and piston cylinder, the output end of the piston cylinder is fixedly connected with web plate mechanism.
Further, the web plate mechanism includes complex root screw mandrel and carries the web plate of resin, the web plate and frame master Combination forms the work nest between the madial wall of body, and the web plate is consolidated by the output end of the complex root screw mandrel and piston cylinder Fixed connection.
The work nest is provided with resin dredging flow groove, and each resin dredging flow groove with the joining place of every resin leak-off pipe Replaceable type resin filter net is all covered with conducting with resin leak-off pipe.
The output end that the resin imports pump is connected with resin importing shower nozzle, and the height of resin importing shower nozzle is higher than The upper surface of work nest.
Further, the bottom of the resin importing shower nozzle is provided with scraper, and the scraper is high with the upper surface of work nest Degree is consistent, and the scraper and scraper motor drive connection, scraper motor driving lower coating blade on work nest Apparent height does horizontal reciprocating movement.
The three probe printing equipments for SLA 3D Stereolithographies that the present invention is realized, by frame main body, sweep Retouch mechanism, resin groove mechanism, drive mechanism, resin importing pump and web plate mechanism to be mutually combined, i.e., resin imports pump by resin storage tank In-house resin is imported in work nest, and drive mechanism drives web plate mechanism to move up and down, while sweep mechanism is scanned adding Work, the resin that work nest is overflowed in process flows back to resin groove mechanism by resin leak-off pipe;So as to realize device entirety One automatic running, is recycled reciprocal production identical product, and production efficiency is high;And compact conformation of the invention, can be as far as possible Reduction equipment uses shared space.
Brief description of the drawings
Fig. 1 is the structural representation that the present invention is implemented.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.
It is shown in Figure 1, it is the three probe printing equipments for SLA 3D Stereolithographies realized of the invention, should Printing equipment includes that frame main body 1, sweep mechanism 2, resin groove mechanism 3, drive mechanism 4, resin import pump 5 and accommodate resin simultaneously The web plate mechanism 6 being processed;Web plate mechanism 6 and drive mechanism 4 are installed in frame main body 1, and web plate mechanism 6 and driving The drive connection of mechanism 4, combines the work nest 7 for being formed and accommodating resin between web plate mechanism 6 and the madial wall of frame main body 1;Scanning Mechanism 2 is located at the surface of work nest 7, and resin groove mechanism 3 is fixedly connected on the bottom of frame main body 1, resin groove mechanism 3 and tree Fat imports the input airtight connection of pump 5, and the output end of resin importing pump 5 is extended at the top edges of processing groove 7;Processing groove 7 are turned on by complex root resin leak-off pipe 8 with resin groove mechanism 3;
Resin imports pump 5 and imports in work nest 7 resin in resin groove mechanism 3, and drive mechanism 4 drives web plate mechanism about 6 Motion, while sweep mechanism 2 is scanned processing, the resin that work nest 7 is overflowed in process passes through resin leak-off pipe stream 8 times Resin groove mechanism.In the present invention, the speed and stability of resin earial drainage are ensure that using complex root resin leak-off pipe 8, is protected Card device overall operation is smooth, will not occur to block and change in flow.
Resin groove mechanism 3 includes resin storage tank 31, resin guide pipe 32, sole plate base 33 and improves the inclination bottom of water conservancy diversion efficiency Plate 34, resin guide pipe 32 is fixedly connected on the bottom of the side of resin storage tank 31;Inclined floor 34 is arranged on the inner side of resin storage tank 31 Bottom, and its inclined placement of support for passing through floor base 33, the end of inclined floor 34 is connected with resin guide pipe 8. In the present invention, the setting of inclined floor 34 can improve the water conservancy diversion efficiency of resin, can be passed to the outflow of resin guide pipe 8 and use Faster, its outflow is also more thorough to make speed when other purposes;Meanwhile, the use of inclined floor 34 can make resin storage tank 31 Interior resin keeps certain flowing, will not be conducive to the use of resin and the guarantor in resin storage tank 31 for a long time in static Deposit.The setting of sole plate base 33 can realize that a stabilization of inclined floor 34 is set, while by regulating base board base 33 Highly, you can the gradient of regulation inclined floor 34, inclined floor 34 is made to realize its function well.
Sweep mechanism 2 includes three probes 21, scanning galvanometer(It is not shown), beam expanding lens(It is not shown)And laser head(Figure is not Show), the laser beam that laser head is emitted is passed after passing sequentially through scanning galvanometer and beam expanding lens from three probes 21, final to shine On the resin penetrated in work nest 7.In the present invention, using three probes 21, its operating efficiency is common 3D scanning and printings dress The twice put, and two work heads can simultaneously work and manufacture different products;Meanwhile, the design of three probes 21 can be with Identical product is manufactured simultaneously, the sweep limits of laser scanning is increased, and more careful behaviour can be realized when big object is printed Make.
It is additionally provided with the inner side upper wall of resin storage tank 31 on liquid level sensor 9, and the upper wall of resin storage tank 31 and offers resin Perfusing hole 311, when liquid level sensor 9 senses resin liquid level, resin infusion mouthful 311 stops perfusion resin.Liquid level sensor 9 Setting can effectively ensure that the resin liquid level of resin storage tank 31 is constantly in a state for relative saturation, so can both tie up The normal operation that resin imports pump 5 is held, can be prevented from not stopping perfusion resin again and be caused resin waste, energy-conservation and efficiently.In addition, In the present invention, resin storage tank 31 is a totally enclosed environment, and totally enclosed environment can farthest prevent resin from making moist change Matter, enables the resin in resin storage tank 31 to be for longer periods stored in resin storage tank 31 and applies to 3D printing.
Drive mechanism 4 includes motor 41 and piston cylinder 42, and motor 41 is arranged on inside frame main body 1, and is driven The input drive connection of dynamic motor 41 and piston cylinder 42, the output end of piston cylinder 42 is fixedly connected with web plate mechanism 6.Drive electricity The up and down motion for being designed to ensure web plate mechanism 6 of machine 41 and piston cylinder 42, so that the resin in web plate mechanism 6 can match somebody with somebody Close sweep mechanism 2 and be preferably shaped to desired 3D three-dimensional real objects.In process, a thickness distance, web plate machine are set Structure 6 carries out resin photocuring from level to level in the case where motor 41 drives and piston cylinder 42 drives successively, completes one After layer resin photocuring, the height of an automatic down or up thickness carries out the Stereolithography of next thickness, final to obtain To desired product.
Web plate mechanism 6 includes complex root screw mandrel 61 and carries the madial wall of the web plate 62 of resin, web plate 62 and frame main body 1 Between combination form work nest 7, web plate 62 is fixedly connected by complex root screw mandrel 61 with the output end of piston cylinder 42.Web plate mechanism 6 realize that the carrying of resin is realized by web plate 62, and its up and down motion is to come real by the connection of screw mandrel 61 and piston cylinder 42 Existing;Different according to product to be processed, web plate 62 can select latticed, or smooth base plate.
Work nest 7 is provided with resin dredging flow groove 71, and each resin dredging flow groove with the joining place of every resin leak-off pipe 8 71 with the conducting of resin leak-off pipe 8 at be all covered with replaceable type resin filter net 10.The effect of resin dredging flow groove 71 be for Resin flowing between work nest 7 and resin leak-off pipe 8 provides a cushion space, and the discrepancy of supplied gas makes in work nest 7 Resin is more smooth when resin leak-off pipe 8 is entered;In addition, replaceable type resin filter net 10 can be good at filtering out it is residual miscellaneous Material, it is ensured that the pure property of resin, improves the utilization rate of resin, it is also possible to prevent trash matter from blocking resin earial drainage conduit 8.
The output end that resin imports pump 5 is connected with resin importing shower nozzle 11, and resin imports the height of shower nozzle 11 higher than work Make the upper surface of groove 7.The effect that resin imports shower nozzle 11 ensure that resin imports pump 5 and enters from resin storage tank 31 by resin Flow velocity is slow and uniform during work nest 7, and the phenomenon that resin is sputtered everywhere will not occur, and also not interfering with carries out photocuring The resin processing of shaping.The highly preferred upper surface to be slightly above work nest 7 of resin importing shower nozzle 11, i.e., less than 2 centimetres, because It is the upper surface flush of the operationally liquid level of resin and work nest 7, resin imports shower nozzle 11 with the upper surface of work nest 7 Highly it is the height between the liquid level of resin during with work.Prevent resin sputtering caused by excessive height and to processing The influence of resin.
The bottom that resin imports shower nozzle 11 is provided with scraper 12, and scraper 12 is consistent with the upper level of work nest 7, and scrapes Knife 12 and scraper motor(It is not shown)Drive connection, scraper motor driving lower coating blade 12 in the upper table of work nest 7 Highly do horizontal reciprocating movement in face.Because resin sheet is as relatively more sticky, it is necessary to the regular hour during injection and use Resin liquid level can just become smooth, and easily be caused resin liquid level out-of-flatness by ectocine, so be unfavorable for that the light of resin is consolidated Chemical conversion type, is also just unfavorable for improving the quality of the product for processing.The effect of scraper 12 is in the upper surface of resin liquid level Ceaselessly move back and forth, so as to the liquid level for being always maintained at resin in process is smooth.
The present invention imports pump 5 and web plate by frame main body 1, sweep mechanism 2, resin groove mechanism 3, drive mechanism 4, resin Mechanism 6 is mutually combined, i.e., resin imports pump 5 and imports in work nest 7 resin in resin groove mechanism 3, and drive mechanism 4 drives net Trigger structure 6 moves up and down, while sweep mechanism 2 is scanned processing, the resin that work nest 7 is overflowed in process passes through resin 8 times resin groove mechanisms of leak-off pipe stream;An automatic running overall so as to realize device, is recycled reciprocal production identical product, Production efficiency is high;And compact conformation of the invention, can as far as possible reduce equipment and use shared space.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (9)

1. a kind of three probe printing equipments for SLA 3D Stereolithographies, it is characterised in that the printing equipment includes frame Main body, sweep mechanism, resin groove mechanism, drive mechanism, resin import pump and accommodate resin and the web plate mechanism being processed;Institute State web plate mechanism and drive mechanism is installed in frame main body, and web plate mechanism and drive mechanism drive connection, the web plate The work nest for being formed and accommodating resin is combined between mechanism and the madial wall of frame main body;The sweep mechanism is being located at work nest just Top, the resin groove mechanism is fixedly connected on the bottom of frame main body, and the resin groove mechanism imports the input of pump with resin Airtight connection, and the output end of resin importing pump is held to extend at processing groove top edges;The processing groove is by complex root tree Fat leak-off pipe is turned on resin groove mechanism;
The resin imports pump and imports in work nest the in-house resin of resin storage tank, and drive mechanism drives web plate mechanism to transport up and down Dynamic, while sweep mechanism is scanned processing, the resin that work nest is overflowed in process flows back to resin by resin leak-off pipe Groove mechanism.
2. three probe printing equipments of SLA 3D Stereolithographies are used for as claimed in claim 1, it is characterised in that described Resin groove mechanism includes resin storage tank, resin guide pipe, sole plate base and improves the inclined floor of water conservancy diversion efficiency, the resin guide Pipe is fixedly connected on the bottom of resin storage tank side;The inclined floor is arranged on the inside bottom of resin storage tank, and it passes through floor The inclined placement of support of base, the end of the inclined floor is connected with resin guide pipe.
3. three probe printing equipments of SLA 3D Stereolithographies are used for as claimed in claim 1, it is characterised in that described Sweep mechanism includes three probes, scanning galvanometer, beam expanding lens and laser head, and the laser beam that the laser head is emitted is successively By being passed from three probes after scanning galvanometer and beam expanding lens, finally it is radiated on the resin in work nest.
4. three probe printing equipments of SLA 3D Stereolithographies are used for as claimed in claim 2, it is characterised in that described It is additionally provided with liquid level sensor, and the upper wall of resin storage tank on the inner side upper wall of resin storage tank and offers resin infusion mouthful, works as liquid level When sensor sensing is to resin liquid level, resin infusion mouthful stops perfusion resin.
5. three probe printing equipments of SLA 3D Stereolithographies are used for as claimed in claim 1, it is characterised in that described Drive mechanism includes motor and piston cylinder, and the motor is arranged on inside frame main body, and motor and piston The input drive connection of cylinder, the output end of the piston cylinder is fixedly connected with web plate mechanism.
6. three probe printing equipments of SLA 3D Stereolithographies are used for as claimed in claim 5, it is characterised in that described Web plate mechanism includes the web plate of complex root screw mandrel and carrying resin, and formation is combined between the web plate and the madial wall of frame main body The work nest, the web plate is fixedly connected by the complex root screw mandrel with the output end of piston cylinder.
7. three probe printing equipments of SLA 3D Stereolithographies are used for as claimed in claim 1, it is characterised in that described Work nest is provided with resin dredging flow groove, and each resin dredging flow groove and resin leak-off pipe with the joining place of every resin leak-off pipe Conducting at be all covered with replaceable type resin filter net.
8. three probe printing equipments of SLA 3D Stereolithographies are used for as claimed in claim 1, it is characterised in that described The output end that resin imports pump is connected with resin importing shower nozzle, and the resin imports the upper table of the height higher than work nest of shower nozzle Face.
9. three probe printing equipments of SLA 3D Stereolithographies are used for as claimed in claim 8, it is characterised in that described Resin import shower nozzle bottom scraper is installed, the scraper is consistent with the upper level of work nest, and the scraper with scrape Knife motor drive connection, horizontal reciprocating fortune is done in the driving lower coating blade of scraper motor in work nest upper level It is dynamic.
CN201710112644.3A 2017-02-28 2017-02-28 A kind of three probe printing equipments for SLA 3D Stereolithographies Pending CN106915077A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110394979A (en) * 2018-04-25 2019-11-01 中国航发商用航空发动机有限责任公司 Optical soliton interaction equipment
WO2020002776A1 (en) * 2018-06-28 2020-01-02 Planmeca Oy Stereolithography apparatus equipped with resin collecting mechanism and method of operating said apparatus
CN111331840A (en) * 2020-05-07 2020-06-26 恒通西交智能机器(广东)有限公司 A multi-light path light curing 3D printing equipment
CN111331841A (en) * 2020-05-07 2020-06-26 恒通西交智能机器(广东)有限公司 A dual optical path photocuring 3D printing device and printing method thereof
CN112810135A (en) * 2021-02-25 2021-05-18 深圳维示泰克技术有限公司 Material box and using method thereof
CN115847805A (en) * 2022-11-28 2023-03-28 南京师范大学 Photocuring 3D printing device and printing method

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CN201070835Y (en) * 2007-06-14 2008-06-11 中国科学院广州电子技术研究所 Resin liquid level control and coating device for photo-curing rapid-shaping equipment
CN203994729U (en) * 2014-08-15 2014-12-10 上海数造机电科技有限公司 Tank level control system in a kind of photocurable quick shaping process
CN205202182U (en) * 2015-10-27 2016-05-04 哈尔滨工程大学 Quick photocuring 3D printer of fashioned overflow formula high accuracy in cistern

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Publication number Priority date Publication date Assignee Title
CN2336893Y (en) * 1998-10-05 1999-09-08 清华大学 Multiple scanning head sequential scanning apparatus
CN201070835Y (en) * 2007-06-14 2008-06-11 中国科学院广州电子技术研究所 Resin liquid level control and coating device for photo-curing rapid-shaping equipment
CN203994729U (en) * 2014-08-15 2014-12-10 上海数造机电科技有限公司 Tank level control system in a kind of photocurable quick shaping process
CN205202182U (en) * 2015-10-27 2016-05-04 哈尔滨工程大学 Quick photocuring 3D printer of fashioned overflow formula high accuracy in cistern

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110394979A (en) * 2018-04-25 2019-11-01 中国航发商用航空发动机有限责任公司 Optical soliton interaction equipment
CN110394979B (en) * 2018-04-25 2021-09-21 中国航发商用航空发动机有限责任公司 Photocuring forming equipment
WO2020002776A1 (en) * 2018-06-28 2020-01-02 Planmeca Oy Stereolithography apparatus equipped with resin collecting mechanism and method of operating said apparatus
CN111331840A (en) * 2020-05-07 2020-06-26 恒通西交智能机器(广东)有限公司 A multi-light path light curing 3D printing equipment
CN111331841A (en) * 2020-05-07 2020-06-26 恒通西交智能机器(广东)有限公司 A dual optical path photocuring 3D printing device and printing method thereof
CN111331840B (en) * 2020-05-07 2024-11-05 恒通西交智能机器(广东)有限公司 A multi-light path light-curing 3D printing device
CN112810135A (en) * 2021-02-25 2021-05-18 深圳维示泰克技术有限公司 Material box and using method thereof
CN115847805A (en) * 2022-11-28 2023-03-28 南京师范大学 Photocuring 3D printing device and printing method

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Application publication date: 20170704