CN112644018A - Molding plate adjusting structure of photocuring 3D printer - Google Patents
Molding plate adjusting structure of photocuring 3D printer Download PDFInfo
- Publication number
- CN112644018A CN112644018A CN202011380442.5A CN202011380442A CN112644018A CN 112644018 A CN112644018 A CN 112644018A CN 202011380442 A CN202011380442 A CN 202011380442A CN 112644018 A CN112644018 A CN 112644018A
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- China
- Prior art keywords
- gear
- plate
- leveling
- groove
- mounting
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- 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.)
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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
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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
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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 invention provides a forming plate adjusting structure of a photocuring 3D printer, which comprises a first adjusting part and a second adjusting part, wherein the adjusting angles of two degrees of freedom of horizontal (X axis) and pitching (Y axis) are realized through a structure of meshing a gear set and a worm, and the leveling of a printing platform is realized through adjusting a first pointer on a first scale plate and adjusting a second pointer on a second scale plate.
Description
Technical Field
The invention relates to the technical field of 3D printers, in particular to a forming plate adjusting structure of a photocuring 3D printer.
Background
At present, a 3D printer is a rapid prototyping machine, and based on a digital model file, a product is obtained by using adhesive materials such as powdered metal or plastic and the like in a layer-by-layer printing mode. The 3D printer is gradually popularized and applied due to the advantages of high manufacturing speed, multiple material types, good economic benefit and the like; the photocuring forming method is the earliest practical rapid forming technology of a 3D printer, laser with specific wavelength and intensity is focused on the surface of a photocuring material to be sequentially solidified from point to line from line to surface to finish the drawing operation of one layer, then a lifting platform moves the height of one layer in the vertical direction to solidify the other layer, the three-dimensional entity is formed by stacking layer by layer, after the product is printed, the leveling is required before printing, the leveling is a core step, namely, the forming platform and the bottom of a trough groove are adjusted to be closely matched, so that the first layer in the product forming process can be firmly adhered to the forming platform to ensure that the printing can be carried out layer by layer, most of the existing leveling devices are provided with springs at the bottom of the trough, the trough is leveled by manually adjusting the length of the springs or the trough is adjusted by adjusting screws, and the leveling device has high dependence on the technical proficiency of operators, the operation is difficult to carry out by non-professional personnel, time-consuming and has many uncertain factors.
Disclosure of Invention
In order to solve the problems, the invention provides a forming plate adjusting structure of a photocuring 3D printer.
The invention is realized by the following technical scheme:
the invention provides a forming plate adjusting structure of a photocuring 3D printer, which comprises a first adjusting part and a second adjusting part, wherein the first adjusting part is provided with a connecting block, a connecting shaft, an adjusting part, a first scale plate, a first pointer, a first gear, a second gear and a first worm, the connecting block is provided with a first mounting groove, a second mounting groove, a third mounting groove, a first jack, a third jack and a fixing plate, the adjusting part is provided with a second jack, the connecting shaft penetrates through the first jack and the second jack to enable the connecting block and the adjusting part to be movably connected, the first gear is mounted in the first mounting groove, the second gear is mounted in the second mounting groove, the first worm is mounted in the third mounting groove, and the first gear is meshed with the second gear, the second gear is meshed with the first worm, the first pointer is fixedly connected with the first gear, the first gear is fixedly connected with the leveling part, the first scale plate is fixedly connected with the connecting block, the second adjusting part is provided with an installation block, an installation column, a third gear, a fourth gear, a second pointer, a second worm and a second scale plate, the mounting column is inserted into the third jack, so that the first adjusting part and the second adjusting part form movable connection, the third gear is fixedly connected with the connecting block, the fourth gear is arranged on the mounting block, the third gear is meshed with the fourth gear, the fourth gear is meshed with the second worm, the second pointer is fixedly arranged on the fixing piece, and the second scale plate is fixedly arranged on the mounting block.
Further, the connecting block is equipped with inserted sheet, fourth mounting groove and fifth mounting groove, leveling portion is equipped with leveling piece and leveling cardboard, leveling piece with leveling cardboard fixed connection, leveling piece is equipped with first clamping piece and second clamping piece, first clamping piece with form the slot between the second clamping piece, the inserted sheet inserts in the slot, first clamping piece is acceptd in the fourth mounting groove, the second clamping piece is acceptd in the fifth mounting groove.
Further, the leveling block is provided with a limiting block, the limiting block is provided with a first groove, a first inclined plane and a second inclined plane, the first inclined plane is arranged at one end of the first groove, the second inclined plane is arranged at the other end of the first groove, and the first clamping piece and the second clamping piece are fixedly arranged in the first groove.
Further, the shaping board of photocuring 3D printer is adjusted the structure and is equipped with adsorption plate and handle, the adsorption plate is equipped with the slide, the leveling cardboard is equipped with the spout, the slide inserts in the spout, make the adsorption plate with leveling portion block is connected, handle fixed mounting be in on the adsorption plate.
Furthermore, the first scale plate is provided with a first mark and a second groove, the first pointer is inserted into the second groove, so that the first pointer and the first scale plate are movably connected, and the first mark is used for adjusting the first pointer.
Furthermore, the first adjusting portion is provided with a first knob, and the first knob is fixedly connected with the first worm.
Furthermore, the second adjusting portion is provided with a second knob, and the second knob is fixedly connected with the second worm.
Furthermore, the second adjusting part is provided with a mounting box, the mounting box is fixedly connected with the mounting block, the mounting box is provided with a mounting cavity, and the second worm is movably mounted in the mounting cavity.
Furthermore, the second scale plate is provided with a second mark, and the second mark is used for adjusting the second pointer.
The invention has the beneficial effects that:
according to the forming plate adjusting structure of the photocuring 3D printer, the first adjusting part is adjusted by rotating the first knob, the angle adjustment of horizontal (X-axis) rotation is performed, the second adjusting part is adjusted by rotating the second knob, the angle adjustment of pitching (Y-axis) rotation is performed, the printing platform is fixed and does not rotate any more, so that the leveling of the printing platform is realized, the first pointer is adjusted on the first scale plate, the second pointer is adjusted on the second scale plate, the leveling is more accurate, the operation is simple, fast and easy to operate, the printing precision is improved, and the photocuring 3D printer is placed on a horizontal plane or an inclined plane without influencing the normal printing no matter how the external working environment changes.
Drawings
Fig. 1 is a perspective view of a molding plate adjusting structure of a photocuring 3D printer of the present invention;
FIG. 2 is an exploded view of the adjusting structure of the molding plate of the photo-curing 3D printer according to the present invention;
FIG. 3 is a schematic view of another angle-resolved structure of the adjusting structure of the molding plate of the photo-curing 3D printer according to the present invention;
fig. 4 is a schematic view of a connecting block structure of a forming plate adjusting structure of the photocuring 3D printer of the present invention.
Detailed Description
In order to more clearly and completely describe the technical scheme of the invention, the invention is further described with reference to the accompanying drawings.
Referring to fig. 1 to 4, the present invention provides a molding plate adjusting structure of a photo-curing 3D printer, the molding plate adjusting structure of the photo-curing 3D printer includes a first adjusting portion 1 and a second adjusting portion 2, the first adjusting portion 1 is provided with a connecting block 4, a connecting shaft 5, a leveling portion 6, a first scale plate 7, a first pointer 8, a first gear 9, a second gear 10 and a first worm 11, the connecting block 4 is provided with a first mounting groove 13, a second mounting groove 14, a third mounting groove 15, a first jack 19, a third jack 20 and a fixing plate 21, the leveling portion 6 is provided with a second jack 27, the connecting shaft 5 penetrates through the first jack 19 and the second jack 27 to movably connect the connecting block 4 and the leveling portion 6, the first gear 9 is mounted in the first mounting groove 13, the second gear 10 is mounted in the second mounting groove 14, the first worm 11 is installed in the third installation groove 15, the first gear 9 is engaged with the second gear 10, the second gear 10 is engaged with the first worm 11, the first pointer 8 is fixedly connected with the first gear 9, the first gear 9 is fixedly connected with the leveling part 6, the first scale plate 7 is fixedly connected with the connection block 4, the second adjustment part 2 is provided with an installation block 35, an installation column 36, a third gear 37, a fourth gear 38, a second pointer 43, a second worm 39 and a second scale plate 40, the installation column 36 is inserted into the third insertion hole 20 to movably connect the first adjustment part 1 and the second adjustment part 2, the third gear 37 is fixedly connected with the connection block 4, the fourth gear 38 is installed on the installation block 35, and the third gear 37 is engaged with the fourth gear 38, the fourth gear 38 is engaged with the second worm 39, the second pointer 43 is fixedly mounted on the fixing plate 21, and the second scale plate 40 is fixedly mounted on the mounting block 35.
In this embodiment, the first adjusting portion 1 is used for adjusting the turning in the horizontal (X-axis) direction, the first adjusting portion 1 is implemented by using a gear set structure, the first gear 9 is engaged with the second gear 10, the second gear 10 is engaged with the first worm 11, the first gear 9, the second gear 10 and the first worm 11 are mounted on the connecting block 4, the first gear 9 is fixedly mounted on the leveling portion 6, the first worm 11 is rotated, the first worm 11 drives the second gear 10 to rotate, the second gear 10 drives the first gear 9 to rotate, the first gear 9 rotates to drive the leveling portion 6 to rotate for leveling in the horizontal (X-axis) direction, the first pointer 8 is fixedly connected with the first gear 9, the first gear 9 rotates to drive the first pointer 8 to rotate, the first pointer 8 is movably connected with the first scale plate 7, the first pointer 8 can sweep on the first scale plate 7, the horizontal (X-axis) direction adjustment can be more precisely and accurately achieved through the first pointer 8 and the first scale plate 7, the connecting shaft 5 movably connects the connecting block 4 and the leveling part 6, the connecting shaft 5 also serves as a gear shaft of the first gear 9 and can enable the first gear 9 to rotate, a hole is formed in the third mounting groove 15, a shaft of the first worm 11 is inserted into the hole, the first worm 11 can rotate in the third mounting groove 15, and the second gear 10 is movably mounted in the second mounting groove 14 through a shaft;
the second adjusting portion 2 is used for adjusting the turning of the pitch (Y axis) direction, the second adjusting portion 2 is implemented by using a gear set structure, the third gear 37 is engaged with the fourth gear 38, the fourth gear 38 is engaged with the second worm 39, the third gear 37 is fixedly connected to the fixing plate 21, the second worm 39 rotates to drive the fourth gear 38, the fourth gear 38 rotates to drive the third gear 37, the third gear 37 rotates to drive the connecting block 4 to rotate along the Y axis direction, the connecting block 4 is inserted into the third insertion hole 20 through the mounting post 36 to form a movable connection with the mounting block 35, the connecting block 4 can rotate along the mounting post 36, the second pointer 43 is fixedly mounted on the fixing plate 21 and attached to the second scale plate 40, and the second pointer 43 can sweep on the second scale plate 40, along with connecting block 4 is along erection column 36 rotates, second pointer 43 is also in rotate on the second scale plate 40, directional different angle, the user can carry out the leveling according to the scale from two directions of horizontal upset (X axle) every single move upset (Y axle), makes the leveling more accurate, and easy operation is swift easily to the beginning, has also improved simultaneously and has printed the precision, no matter how external operational environment changes, places the photocuring 3D printer in horizontal plane or inclined plane and does not influence the normal clear of printing.
Further, the connecting block 4 is provided with an inserting piece 18, a fourth mounting groove 16 and a fifth mounting groove 17, the leveling portion 6 is provided with a leveling block 22 and a leveling clamping plate 23, the leveling block 22 is fixedly connected with the leveling clamping plate 23, the leveling block 22 is provided with a first clamping piece 24 and a second clamping piece 25, a slot 26 is formed between the first clamping piece 24 and the second clamping piece 25, the inserting piece 18 is inserted into the slot 26, the first clamping piece 24 is accommodated in the fourth mounting groove 16, and the second clamping piece 25 is accommodated in the fifth mounting groove 17.
In this embodiment, the connecting block 4 with leveling portion 6 passes through inserted sheet 18 inserts first clamping piece 24 with between the second clamping piece 25 in slot 26, through connecting axle 5 will inserted sheet 18 first clamping piece 24 with second clamping piece 25 connects, forms the pivot structure, first gear 9 with first clamping piece 24 fixed connection, inserted sheet 18 first clamping piece 24 with second clamping piece 25 all is circular, is convenient for the connecting block 4 for leveling portion 6 rotates.
Further, leveling block 22 is equipped with stopper 28, stopper 28 is equipped with first recess 29, first inclined plane 30, second inclined plane 31, first inclined plane 30 sets up the one end of first recess 29, second inclined plane 31 sets up the other end of first recess 29, first clamping piece 24 with second clamping piece 25 fixed mounting is in first recess 29.
In the present embodiment, the first jaw 24 and the second jaw 25 are mounted in the first groove 29, the insert sheet 18 is inserted into the insert groove 26, the insert sheet 18 is also accommodated in the first groove 29, because the first groove 29 is of a circular arc shape, the inserting piece 18 can rotate relative to the first clamping piece 24 and the second clamping piece 25 in the first groove 29, the first and second slopes 30 and 31 are provided on both sides of the first groove 29, is used for limiting the position of the leveling part 6, limiting the rotation angle of the leveling part 6 along the connecting shaft 5, when the first inclined surface 30 is contacted with the connecting block 4, or the second inclined surface 31 contacts with the connecting block 4, the leveling block 22 cannot rotate continuously, and the collision of various parts can be prevented.
Further, the shaping board of photocuring 3D printer is adjusted the structure and is equipped with adsorption plate 3 and handle 46, adsorption plate 3 is equipped with slide 47, leveling cardboard 23 is equipped with spout 32, slide 47 inserts in the spout 32, make adsorption plate 3 with leveling 6 block connection, handle 46 fixed mounting be in on the adsorption plate 3.
In this embodiment, the adsorption plate 3 needs to be leveled with an external solution box, the adsorption plate 3 is assembled by inserting the sliding plate 47 into the structure of the sliding groove 32, the clamping is installed on the leveling clamping plate 23, the handle 46 is convenient for a user to take down or assemble the adsorption plate 3, and the sliding groove 32 and the sliding plate 47 are also convenient for using and operating.
Further, the first scale plate 7 is provided with a first mark 34 and a second groove 33, the first pointer 8 is inserted into the second groove 33, so that the first pointer 8 and the first scale plate 7 form a movable connection, and the first mark 34 is used for adjusting the first pointer 8.
In this embodiment, the first pointer 8 is movably installed in the second groove 33, so that the first pointer 8 can rotate relative to the first scale plate 7, the first mark 34 is an angle scale mark, and the first pointer 8 can rotate on the first scale plate 7 to point to different angles, so that the first adjusting portion 1 can be leveled more accurately.
Further, the first adjusting portion 1 is provided with a first knob 12, and the first knob 12 is fixedly connected with the first worm 11.
In this embodiment, the user can adjust the first adjusting portion 1 by rotating the first knob 12, such that the first knob 12 rotates the first worm 11.
Further, the second adjusting portion 2 is provided with a second knob 44, and the second knob 44 is fixedly connected with the second worm 39.
In this embodiment, the user can adjust the second adjusting portion 2 by rotating the second knob 44, such that the second knob 44 rotates the second worm 39.
Further, the second adjusting portion 2 is provided with a mounting box 41, the mounting box 41 is fixedly connected with the mounting block 35, the mounting box 41 is provided with a mounting cavity 42, and the second worm 39 is movably mounted in the mounting cavity 42.
In this embodiment, the second worm 39 is mounted in the mounting box 41, the mounting box 41 has a hole therein, and a shaft of the second worm 39 is inserted into the hole, so that the second worm 39 can rotate in the mounting cavity 42.
Further, the second scale plate 40 is provided with a second mark 45, and the second mark 45 is used for adjusting the second pointer 43
In this embodiment, the second pointer 43 can rotate relative to the second scale plate 40, the second mark 45 is an angle scale mark, and the second pointer 43 can rotate on the second scale plate 40 to point to different angles, so that the second adjustment portion 2 can be leveled more accurately.
Of course, the present invention may have other embodiments, and based on the embodiments, those skilled in the art can obtain other embodiments without any creative effort, and all of them are within the protection scope of the present invention.
Claims (9)
1. The utility model provides a shaping plate regulation structure of photocuring 3D printer, a serial communication port, the shaping plate regulation structure of photocuring 3D printer includes first regulating part and second regulating part, first regulating part is equipped with connecting block, connecting axle, leveling portion, first scale plate, first pointer, first gear, second gear and first worm, the connecting block is equipped with first mounting groove, second mounting groove, third mounting groove, first jack, third jack and stationary blade, leveling portion is equipped with the second jack, the connecting axle runs through first jack and second jack, makes the connecting block with leveling portion forms the swing joint, first gear is installed in the first mounting groove, the second gear is installed in the second mounting groove, first worm is installed in the third mounting groove, first gear with the second gear meshing is connected, the second gear is meshed with the first worm, the first pointer is fixedly connected with the first gear, the first gear is fixedly connected with the leveling part, the first scale plate is fixedly connected with the connecting block, the second adjusting part is provided with an installation block, an installation column, a third gear, a fourth gear, a second pointer, a second worm and a second scale plate, the mounting column is inserted into the third jack, so that the first adjusting part and the second adjusting part form movable connection, the third gear is fixedly connected with the connecting block, the fourth gear is arranged on the mounting block, the third gear is meshed with the fourth gear, the fourth gear is meshed with the second worm, the second pointer is fixedly arranged on the fixing piece, and the second scale plate is fixedly arranged on the mounting block.
2. The forming plate adjusting structure of the photocuring 3D printer of claim 1, wherein the connecting block is provided with an inserting piece, a fourth mounting groove and a fifth mounting groove, the leveling part is provided with a leveling block and a leveling clamping plate, the leveling block is fixedly connected with the leveling clamping plate, the leveling block is provided with a first clamping piece and a second clamping piece, a slot is formed between the first clamping piece and the second clamping piece, the inserting piece is inserted into the slot, the first clamping piece is accommodated in the fourth mounting groove, and the second clamping piece is accommodated in the fifth mounting groove.
3. The forming plate adjusting structure of the photocuring 3D printer of claim 2, wherein the leveling block is provided with a limiting block, the limiting block is provided with a first groove, a first inclined surface and a second inclined surface, the first inclined surface is arranged at one end of the first groove, the second inclined surface is arranged at the other end of the first groove, and the first clamping piece and the second clamping piece are fixedly arranged in the first groove.
4. The forming plate adjusting structure of the photo-curing 3D printer according to claim 2, wherein the forming plate adjusting structure of the photo-curing 3D printer is provided with an adsorption plate and a handle, the adsorption plate is provided with a sliding plate, the leveling clamping plate is provided with a sliding groove, the sliding plate is inserted into the sliding groove to enable the adsorption plate to be connected with the leveling portion in a clamping manner, and the handle is fixedly mounted on the adsorption plate.
5. A molding plate adjusting structure of a photo-curing 3D printer according to claim 1, wherein the first scale plate is provided with a first mark and a second groove, the first pointer is inserted into the second groove to form a movable connection with the first scale plate, and the first mark is used for the first pointer adjustment.
6. The forming plate adjusting structure of the light-curing 3D printer according to claim 1, wherein the first adjusting portion is provided with a first knob, and the first knob is fixedly connected with the first worm.
7. The forming plate adjusting structure of the light-curing 3D printer according to claim 1, wherein the second adjusting portion is provided with a second knob, and the second knob is fixedly connected with the second worm.
8. The forming plate adjusting structure of the light-curing 3D printer according to claim 1, wherein the second adjusting portion is provided with a mounting box, the mounting box is fixedly connected with the mounting block, the mounting box is provided with a mounting cavity, and the second worm is movably mounted in the mounting cavity.
9. A molding plate adjusting structure of a light-curing 3D printer according to claim 1, wherein the second scale plate is provided with a second mark, and the second mark is used for adjustment of the second pointer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011380442.5A CN112644018A (en) | 2020-11-30 | 2020-11-30 | Molding plate adjusting structure of photocuring 3D printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011380442.5A CN112644018A (en) | 2020-11-30 | 2020-11-30 | Molding plate adjusting structure of photocuring 3D printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112644018A true CN112644018A (en) | 2021-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011380442.5A Pending CN112644018A (en) | 2020-11-30 | 2020-11-30 | Molding plate adjusting structure of photocuring 3D printer |
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| Country | Link |
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| CN (1) | CN112644018A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111572245A (en) * | 2020-04-23 | 2020-08-25 | 龙岩市云惠企科技有限公司 | Multifunctional amplification drawing device for model design |
| CN111844734A (en) * | 2020-06-17 | 2020-10-30 | 南宁壶兰科技有限公司 | Platform adjustment mechanism of photocuring 3D printer |
| CN211968440U (en) * | 2020-03-20 | 2020-11-20 | 黄河水利职业技术学院 | Photocuring 3D printer levelling mechanism |
-
2020
- 2020-11-30 CN CN202011380442.5A patent/CN112644018A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211968440U (en) * | 2020-03-20 | 2020-11-20 | 黄河水利职业技术学院 | Photocuring 3D printer levelling mechanism |
| CN111572245A (en) * | 2020-04-23 | 2020-08-25 | 龙岩市云惠企科技有限公司 | Multifunctional amplification drawing device for model design |
| CN111844734A (en) * | 2020-06-17 | 2020-10-30 | 南宁壶兰科技有限公司 | Platform adjustment mechanism of photocuring 3D printer |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Hongjiu Inventor after: Wu Zhen Inventor after: Chen Bingyun Inventor after: Yang Huajie Inventor after: Wu Jiehua Inventor after: Qiu Haiping Inventor before: Yang Hongjiu Inventor before: Wu Zhen Inventor before: Huang Yishan Inventor before: Yang Huajie Inventor before: Wu Jiehua Inventor before: Xie Anqiong |
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Application publication date: 20210413 |