CN117207517A - Rotary liquid tank device and method for promoting continuous liquid interface printing resin backflow - Google Patents
Rotary liquid tank device and method for promoting continuous liquid interface printing resin backflow Download PDFInfo
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- CN117207517A CN117207517A CN202311322650.3A CN202311322650A CN117207517A CN 117207517 A CN117207517 A CN 117207517A CN 202311322650 A CN202311322650 A CN 202311322650A CN 117207517 A CN117207517 A CN 117207517A
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- 239000007788 liquid Substances 0.000 title claims abstract description 116
- 238000007639 printing Methods 0.000 title claims abstract description 115
- 239000011347 resin Substances 0.000 title claims abstract description 93
- 229920005989 resin Polymers 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001737 promoting effect Effects 0.000 title abstract description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 97
- 230000007246 mechanism Effects 0.000 claims abstract description 47
- 238000010008 shearing Methods 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 38
- 239000001301 oxygen Substances 0.000 claims abstract description 38
- 239000012528 membrane Substances 0.000 claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000003860 storage Methods 0.000 claims description 59
- 239000012530 fluid Substances 0.000 claims description 32
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 6
- 230000009471 action Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 238000000016 photochemical curing Methods 0.000 description 6
- 238000010146 3D printing Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Abstract
The invention discloses a rotary liquid tank device and a method for promoting continuous liquid interface printing resin backflow. The method comprises the following steps: pouring the resin slurry into the groove, stopping when the printing platform descends to the upper part of the oxygen permeable membrane, and driving the passive transmission mechanism to rotate by the active transmission mechanism so as to drive the backflow resin to flow in a flow shearing area between the printing object and the oxygen permeable membrane, so that the resin in the area is thinned, and the viscosity is reduced to promote the backflow of the resin in the printing process. The invention obviously reduces the viscosity of the resin in printing, has large-format and large-size printing forming capability, and overcomes the defect that the traditional continuous liquid interface printing can only print a small format.
Description
Technical Field
The invention relates to the field of photo-curing 3D printing, in particular to a rotary liquid tank device and method for promoting resin backflow in a continuous liquid interface printing process.
Background
Compared with other 3D printing modes, the photo-curing 3D printing technology has the advantages of high molding precision, high molding speed and the like, and is widely applied to the fields of biomedical treatment, ceramic manufacture, dentistry and the like. The traditional Digital Light Processing (DLP) photo-curing printing technology needs repeated steps of sinking, curing and pulling when each layer is constructed, and the intermittent discretization printing mode not only affects the printing efficiency, but also causes the surface of the product to have obvious 'step effect' in a layer-by-layer stacking mode, thereby seriously affecting the surface finish. In recent years, continuous liquid interface printing technology (CLIP) proposed by other scholars has further revolutionized photo-curing 3D printing. The technology mainly realizes the permeation of oxygen by means of the oxygen permeable membrane at the bottom of the liquid tank, and the photo-curing polymerization reaction can be restrained from encountering oxygen, so that a layer of flow area which is not cured, also called dead zone, can be formed above the oxygen permeable membrane. Based on the principle, the continuous liquid interface printing technology can realize continuous lifting of a printing platform, and continuous exposure is carried out on a light source. Therefore, the printing speed is greatly improved, the continuous molding principle is also fundamentally eliminated from the step effect, and the surface finish of the product is improved.
However, an important problem faced by continuous liquid interface printing techniques is the timely fill reflow of the resin paste. In the process of continuous lifting and rising of the printing platform, resin below a printing object needs to reflow in time to fill the left gaps so as to be cured at the next time. Resin sizing agent for photo-curing 3D printing has non-Newtonian fluid characteristics and higher viscosity, and in the continuous liquid interface printing process, resin sizing agent can not flow back completely in a limited time due to overlarge printing breadth or overlarge resin viscosity, and the time for resin backflow is greatly shortened due to the continuous printing mode. Therefore, there is often a print defect such as a void in the center of the print object due to the incomplete filling of the resin. However, the time for resin to reflow to the center point is not only related to the design size of the print object, but also has a great relationship with the viscosity of the print resin, and the higher the viscosity is, the slower the reflow speed is. Therefore, the existing continuous liquid interface printing technology is difficult to be used in the printing process of high-viscosity resin slurry and large-size breadth, is often used for printing and forming low-viscosity resin, hollow structures and small breadth, and severely limits the application of the technology.
Disclosure of Invention
In order to solve the problems, the invention discloses a rotary liquid tank device and a method for promoting the backflow of continuous liquid interface printing resin. By utilizing the shear thinning characteristics of the non-newtonian fluid of the resin slurry, a flow shear zone is formed by rotating the liquid tank to generate a shear force in a region between the bottom end of the print object and the oxygen permeable membrane by rotation of the liquid tank body. The resin in the reflow gap is acted by shearing force, so that the viscosity of the resin is reduced, the reflow efficiency of the resin is further improved, and the resin has the capability of printing high-viscosity resin and large-format objects.
The technical scheme adopted by the invention is as follows:
1. a rotary fluid bath apparatus for facilitating resin reflow during continuous liquid interface printing:
the device comprises a driven transmission mechanism and an active transmission mechanism, wherein the driven transmission mechanism and the active transmission mechanism form a rotary liquid tank body integral structure, the driven transmission mechanism is of a round structure, an annular meshing rack is fixed on the peripheral surface of the driven transmission mechanism, and the active transmission mechanism is arranged beside the driven transmission mechanism and drives the driven transmission mechanism to rotate by the meshing rack.
The passive transmission mechanism comprises a liquid storage tank body; the circular groove is formed in the top surface of the liquid storage tank body, the groove is circular, so that transmission is facilitated, fluid state in the liquid storage tank is more stable, energy loss is reduced, an annular meshing rack is fixedly arranged on the outer wall of the liquid storage tank body, the meshing rack and the liquid storage tank body are of an integrated structure, CNC integrated processing and forming or welding and combined forming are performed after two parts are respectively processed, and the meshing rack is connected with the driving transmission mechanism.
The driving transmission mechanism comprises a driving motor, a coupler and a main transmission part; the driving motor and the main transmission part are horizontally arranged, the driving motor is connected with a power supply, the output end of the driving motor is connected with the main transmission part through a coupler, the main transmission part is meshed with the meshing rack, the driving motor transmits power to the main transmission part through the coupler, and the liquid storage tank body with the meshing rack is rotated under the drive of the main transmission part.
The bottom fixed cover of reservoir body is equipped with the support bearing, and reservoir body and support bearing interference fit play the effect of fixed reservoir body, the meshing rack is located the top of support bearing about 10mm department.
The device comprises a liquid storage tank body, a transparent oxygen permeable film is arranged at the bottom of the circular groove of the liquid storage tank body, a solidification dead zone with the thickness of about 100 mu m is formed at the bottom of the circular groove, a resin filling area is arranged in a groove above the oxygen permeable film, non-Newtonian fluid backflow resin is filled in the resin filling area, a circular printing platform which is lifted along the vertical direction is arranged above the liquid storage tank body, the diameter of the printing platform is larger than 120mm and smaller than the inner diameter of the liquid storage tank body, the printing device is guaranteed to have printing capacity of large-size breadth, a printing object is arranged below the printing platform, the thickness of the printing layer is 10 mu m, a gap is reserved between the printing object and the oxygen permeable film to form a flow shearing area for backflow resin to flow, the flow shearing area with the thickness of about 110 mu m is kept between the printing object and the oxygen permeable film through rotation of the liquid storage tank body, and the resin filling area above the oxygen permeable film is filled with the backflow resin of the non-Newtonian fluid under the action of rotation shearing.
The liquid storage tank body and the printing platform are designed into a circular structure, meanwhile, rotary driving is realized by means of the meshing racks and the supporting bearings, rotary motion can be realized without a central supporting shaft, interference between a central shaft and a bottom ultraviolet light source is avoided, in addition, the flow of liquid in the rotary process of the circular liquid storage tank body is more stable, turbulence is not generated, and loss of flow energy and damage to a shearing flow field are avoided.
The transmission mode of the main transmission part and the meshing rack is worm and gear transmission, and also can be chain transmission and gear transmission; the worm drive has a larger transmission ratio, the meshing surface between the worm and the gear is larger, the relative sliding speed is lower, the structure of the worm drive is more compact, and the occupied space of the printer can be reduced.
The oxygen permeable membrane is made of polytetrafluoroethylene film material, and has good light and oxygen permeability.
2. A method for facilitating continuous liquid interface printing by a rotary fluid bath apparatus:
1) Pouring the resin slurry into the groove of the liquid storage tank body, stopping when the printing platform descends to a position 110 mu m away from the upper side of the oxygen permeable membrane along the vertical direction, and driving the driven transmission mechanism to rotate by the driving transmission mechanism;
2) The passive transmission mechanism rotates to drive the backflow resin to flow in a flow shearing area between the printing object and the oxygen permeable membrane, and at the moment, the printing platform moves upwards along the vertical direction to start printing.
The step 1) specifically comprises the following steps: the driving motor transmits power to the main transmission part through the coupler, the main transmission part and the meshing rack worm gear drive the liquid storage tank body to rotate, and the rotating speed of the liquid storage tank body and the shearing rate of the liquid storage tank body can be adjusted by controlling the rotating speed of the driving motor.
The step 2) specifically comprises the following steps: the liquid storage tank body rotates to drag flowing resin in the flowing shearing area, the flowing resin generates fluid shearing force and reduces self viscosity, the fluid shearing force is uniformly distributed, the flowing resin flows stably, the circle center of the circular groove of the liquid storage tank body is used as the center, the printing process is regulated and controlled through the shearing rates at different radial positions of the circular groove, the shearing rates of the fluid shearing force at different radial positions of the circular groove are different at the same rotating speed, and the shearing rate is higher as the distance from the center is longer.
When the printing is actually started, the single-layer thickness of the model slice is set to be 10 mu m, the resin slurry is poured into the liquid storage tank body, the printing platform descends along the vertical direction, and the printing platform stops when reaching a distance of about 110 mu m above the oxygen permeable membrane. The driving motor transmits power to the main transmission part through the coupler, and the liquid storage tank body with the meshing rack rotates under the drive of the main transmission part. The rotation speed of the liquid storage tank body and the shearing rate thereof can be adjusted by controlling the rotation speed of the driving motor. The slit liquid film formed between the printing object and the oxygen permeable film generates fluid shearing force under the action of the rotation of the liquid tank, so that the viscosity of the resin slurry in the slit liquid film is reduced, and the backflow speed of the resin in the printing process is promoted.
In the printing process, the resin slurry flows in the slit under the shearing action, and the flowing speed is seriously influenced by the self viscosity of the liquid. Therefore, under the same printing size, the reflow filling time of the resin slurry after shear thinning is greatly shortened, the efficiency of resin flow is improved, and the printing defect caused by insufficient reflow filling is avoided.
The beneficial effects of the invention are as follows:
1. by utilizing the shear thinning characteristic of the non-Newtonian fluid, the thin layer flowing region between the oxygen permeable membrane and the printing object is driven to generate a shearing action by rotating the liquid tank body, so that the viscosity of the resin in the region is obviously reduced, the efficiency of resin reflow filling and integral printing is improved, and the capability of printing high-viscosity resin is further obtained.
2. The liquid storage tank body and the printing platform with the circular structures ensure the feasibility and the stability of power transmission; meanwhile, in the rotation process of the liquid tank, the liquid resin is driven by the shearing force to move, turbulence is avoided by utilizing the circular structure, the printed object is prevented from being damaged, and meanwhile, the transfer of the shearing energy of the fluid is facilitated.
3. The structure of the rotary liquid tank not only improves the resin backflow efficiency, but also avoids printing defects; meanwhile, the printing device has large-format and large-size printing forming capability, and overcomes the defect that the traditional continuous liquid interface printing can only print small format.
Drawings
Fig. 1: the rotary liquid tank is integrally schematic in structure.
Fig. 2: the structure of the rotary liquid tank is schematically shown in cross section.
Fig. 3: non-newtonian fluid-shear thinning plot of resin syrup.
Fig. 4: schematic diagram of internal shear force distribution of the rotating fluid tank.
Fig. 5: the resin reflow filling schematic is facilitated.
In the figure: 1. the device comprises a rotary liquid tank body integral structure, a driving transmission mechanism, a driven transmission mechanism, a liquid tank body, a meshing rack, a supporting bearing, an oxygen permeable membrane, a printing platform, a printing object, a driving motor, a coupling, a main transmission component, a backflow resin and a resin filling area.
Detailed Description
The technical solutions of the present invention are described and illustrated in detail below by means of specific examples, which are only preferred embodiments of the present invention, but not all examples. On the basis of the embodiment, other embodiments which are not subjected to any creative improvement by the person skilled in the art belong to the protection scope of the embodiment.
As shown in fig. 1 and 2, the rotary liquid tank device of the invention comprises a passive transmission mechanism 3 and an active transmission mechanism 2, wherein the passive transmission mechanism 3 and the active transmission mechanism 2 form a rotary liquid tank integral structure 1, the passive transmission mechanism 3 is of a round structure, an annular meshing rack 5 is fixed on the peripheral surface of the passive transmission mechanism 3, the active transmission mechanism 2 is arranged beside the passive transmission mechanism 3, and the meshing rack 5 drives the passive transmission mechanism 3 to rotate.
The passive transmission mechanism 3 comprises a liquid storage tank body 4; the top surface of the liquid storage tank body 4 is provided with a circular groove, the groove is circular, so that transmission is facilitated, the fluid state in the liquid storage tank is more stable, energy loss is reduced, the outer wall of the liquid storage tank body 4 is fixedly provided with an annular meshing rack 5, the meshing rack 5 and the liquid storage tank body 4 are of an integrated structure, CNC integrated processing molding or welding combination molding is performed after the two parts are respectively processed, the two parts are made of stainless steel materials, the height of the liquid storage tank body 4 is designed to be 60mm, and the diameter of the liquid storage tank body is 150mm; the tooth face width of the meshing rack 5 is designed to be 13mm, so that vibration caused by instability in the transmission process is avoided, and the meshing rack 5 is connected with the driving transmission mechanism 2.
The driving transmission mechanism 2 comprises a driving motor 10, a coupler 11 and a main transmission part 12; the driving motor 10 and the main transmission part 12 are horizontally arranged, the driving motor 10 is connected with a power supply, the output end of the driving motor 10 is connected with the main transmission part 12 through the coupler 11, the main transmission part 12 is meshed with the meshing rack 5, the driving motor 10 transmits power to the main transmission part 12 through the coupler 11, and the liquid storage tank body 4 with the meshing rack 5 is driven by the main transmission part 12 to rotate.
The bottom fixed cover of the liquid storage tank body 4 is provided with a support bearing 6, the liquid storage tank body 4 is in interference fit with the support bearing 6, the liquid storage tank body 4 is fixed, and the meshing rack 5 is positioned at the position about 10mm above the support bearing 6.
The circular groove bottom of the liquid storage tank body 4 is provided with a transparent oxygen permeable membrane 7, free radical polymerization reaction is prevented by oxygen permeation, a curing dead zone with the thickness of about 100 mu m is generated, namely a resin flowing update zone, a resin filling zone 14 is arranged in a groove above the oxygen permeable membrane 7, the resin filling zone 14 is filled with backflow resin 13 of non-Newtonian fluid, a circular printing platform 8 which is lifted along the vertical direction is arranged above the liquid storage tank body 4, the diameter of the printing platform 8 is larger than 120mm and smaller than the inner diameter of the liquid storage tank body 4, large-format printing capability is guaranteed, and the printing platform 8 needs to be lifted continuously along the vertical direction, so that the time reserved for resin slurry backflow filling is shorter, and the liquid storage tank is only suitable for printing of low-viscosity resin slurry or small-size format printing and does not have large-size format printing capability. By shear thinning the fluid in the resin reflow region, rapid reflow is achieved, and the size of the printing platform 8 designed by the invention is large enough to meet the requirements of large-format printing and forming. The printing platform 8 below is for printing the object 9, and printing platform 8 selects aluminum alloy material to pass through CNC machine-shaping, and the surface carries out frosting to guarantee to keep good adhesive force between printing platform 8 and the printing object 9. The liquid storage tank body 4 with the meshing rack 5 is embedded into the supporting bearing 6 below and is matched with the inner wall surface of the bearing in an interference manner, so that the stability of transmission is ensured. The thickness of the printing layer is set to 10 mu m, a gap is reserved between the printing object 9 and the oxygen permeable membrane 7 to form a flowing shearing area for flowing the backflow resin 13, and the flowing shearing area with the thickness of about 110 mu m is kept between the printing object 9 and the oxygen permeable membrane 7 through the rotation of the liquid storage tank body 4, so that the backflow resin 13 filled with the non-Newtonian fluid is accelerated under the action of rotating shearing in the resin filling area 14 above the oxygen permeable membrane 7.
Because the traditional square liquid tank is unfavorable for transmission, the liquid storage tank body 4 and the corresponding printing platform 8 are designed into a circular structure, and meanwhile, the rotary driving is realized by means of the annular meshing rack 5 and the supporting bearing 6 at the bottom end of the liquid tank, the rotary motion can be realized without a central supporting shaft, and the interference between a central shaft and a bottom ultraviolet light source is avoided. In addition, the circular liquid storage tank body 4 is more stable in liquid flow in the rotating process, turbulence is not generated, and loss of flow energy and damage to a shear flow field are avoided.
The relationship between the viscosity of the photo-cured 3D printed resin paste and the shear rate is shown in fig. 3, and the viscosity of the resin paste is significantly affected by the shear rate. In the initial stage of shearing, the viscosity of the resin slurry is greatly reduced, and finally the resin slurry tends to be stable, and has obvious non-Newtonian fluid characteristics, and the viscosity of the final resin slurry is obviously reduced by about 10 times under the influence of shearing.
The transmission mode of the main transmission part 12 and the meshing rack 5 is worm and gear transmission, and also can be chain transmission and gear transmission; the worm drive has a larger transmission ratio, the meshing surface between the worm and the gear is larger, the relative sliding speed is lower, the structure of the worm drive is more compact, and the occupied space of the printer can be reduced.
The oxygen permeable membrane 7 is made of polytetrafluoroethylene film material, and has good light and oxygen permeability.
The method for promoting continuous liquid interface printing by using the rotary liquid tank device comprises the following steps:
1) Pouring the resin slurry into the groove of the liquid storage tank body 4, stopping the printing platform 8 when the printing platform descends to a position 110 mu m above the oxygen permeable membrane 7 along the vertical direction, and driving the driven transmission mechanism 3 to rotate by the driving transmission mechanism 2;
2) The passive transmission mechanism 3 rotates to drive the backflow resin 13 to flow in a flow shearing area between the printing object 9 and the oxygen permeable membrane 7, and at the moment, the printing platform 8 moves upwards along the vertical direction to start printing.
The step 1) is specifically as follows: the driving motor 10 transmits power to the main transmission part 12 through the coupler 11, and the main transmission part 12 and the meshing rack 5 are in worm gear transmission to drive the liquid storage tank body 4 to rotate.
The step 2) is specifically as follows: the flowing resin 13 in the flowing shearing area is pulled by the rotary motion of the liquid storage tank body 4, the flowing resin 13 generates fluid shearing force and the self viscosity is reduced, the shearing distribution effect formed by the fluid shearing area between the printing object 9 and the oxygen permeable membrane 7 under the drive of the rotary liquid tank is shown in figure 4, the fluid shearing force is uniformly distributed, the flowing resin 13 flows stably, the circle center of the circular groove of the liquid storage tank body 4 is taken as the center, the printing process is regulated and controlled by the shearing rate of the fluid shearing force at different radial positions of the circular groove at the same rotating speed, and the shearing rate is higher as the distance from the center is.
When the printing is actually started, the thickness of the single layer of the model slice is set to be 10 μm, the resin slurry is poured into the liquid storage tank 4, the printing platform 8 is lowered in the vertical direction, and the printing is stopped when reaching a distance of about 110 μm above the oxygen permeable membrane 7. The driving motor 10 transmits power to the main transmission part 12 through the coupling 11, and the liquid storage tank body 4 with the meshing rack 5 rotates under the drive of the main transmission part 12. The rotational speed of the reservoir body 4 and its shear rate can be adjusted by controlling the rotational speed of the drive motor 10. The slit liquid film formed between the print object 9 and the oxygen permeable film 7 generates a fluid shear force under the action of rotation of the liquid tank, so that the viscosity of the resin slurry in the slit liquid film is reduced, and the backflow speed of the resin in the printing process is promoted.
In the printing process, as shown in fig. 5, the resin paste flows in the slit in the process of reflow under the shearing action, and the flow speed is severely affected by the self-viscosity of the liquid. Therefore, under the same printing size, the reflow filling time of the resin slurry after shear thinning is greatly shortened, the efficiency of resin flow is improved, and the printing defect caused by insufficient reflow filling is avoided.
Claims (9)
1. A rotary fluid bath apparatus for facilitating continuous liquid interface printing resin reflow, characterized in that: the device comprises a passive transmission mechanism (3) and an active transmission mechanism (2), wherein the passive transmission mechanism (3) is of a round structure, an annular meshing rack (5) is fixed on the peripheral surface of the passive transmission mechanism (3), the active transmission mechanism (2) is arranged beside the passive transmission mechanism (3), and the meshing rack (5) drives the passive transmission mechanism (3) to rotate.
2. A rotary fluid bath apparatus for facilitating the backflow of continuous liquid interface printing resin as defined in claim 1, wherein:
the passive transmission mechanism (3) comprises a liquid storage tank body (4); the top surface of the liquid storage tank body (4) is provided with a circular groove, the outer wall of the liquid storage tank body (4) is fixedly provided with an annular meshing rack (5), and the meshing rack (5) is connected with the driving transmission mechanism (2).
3. A rotary fluid bath apparatus for facilitating the backflow of continuous liquid interface printing resin as defined in claim 1, wherein:
the driving transmission mechanism (2) comprises a driving motor (10), a coupler (11) and a main transmission part (12); the driving motor (10) and the main transmission part (12) are horizontally arranged, the driving motor (10) is connected with a power supply, the output end of the driving motor (10) is connected with the main transmission part (12) through a coupler (11), and the main transmission part (12) is meshed with the meshing rack (5).
4. A rotary fluid bath apparatus for facilitating the backflow of continuous liquid interface printing resin as defined in claim 2, wherein:
the bottom of the liquid storage tank body (4) is fixedly sleeved with a supporting bearing (6), the liquid storage tank body (4) is in interference fit with the supporting bearing (6), and the meshing rack (5) is located above the supporting bearing (6).
5. A rotary fluid bath apparatus for facilitating the backflow of continuous liquid interface printing resin as defined in claim 2, wherein:
the circular groove bottom of the liquid storage tank body (4) is provided with a transparent oxygen permeable membrane (7), a resin filling area (14) is arranged in a groove above the oxygen permeable membrane (7), the resin filling area (14) is filled with non-Newtonian fluid backflow resin (13), a circular printing platform (8) which ascends and descends along the vertical direction is arranged above the liquid storage tank body (4), a printing object (9) is arranged below the printing platform (8), the thickness of the printing layer is 10 mu m, and a gap is reserved between the printing object (9) and the oxygen permeable membrane (7) to form a flow shearing area.
6. A rotary fluid bath apparatus for facilitating the backflow of continuous liquid interface printing resin as defined in claim 3, wherein:
the transmission mode of the main transmission part (12) and the meshing rack (5) is worm and gear transmission.
7. A method of facilitating continuous liquid interface printing for use in the apparatus of any one of claims 1-6, characterized by: the method comprises the following steps:
1) pouring resin slurry into a groove of a liquid storage tank body (4), stopping when a printing platform (8) descends to a position 110 mu m away from the upper part of an oxygen permeable membrane (7) along the vertical direction, and driving a driven transmission mechanism (3) to rotate by an active transmission mechanism (2);
2) The passive transmission mechanism (3) rotates to drive the backflow resin (13) to flow in a flow shearing area between the printing object (9) and the oxygen permeable membrane (7), and at the moment, the printing platform (8) moves upwards along the vertical direction to start printing.
8. The method of facilitating continuous liquid interface printing according to claim 7, wherein:
the step 1) specifically comprises the following steps: the driving motor (10) transmits power to the main transmission part (12) through the coupler (11), and the main transmission part (12) and the meshing rack (5) are in worm gear transmission to drive the liquid storage tank body (4) to rotate.
9. The method of facilitating continuous liquid interface printing according to claim 7, wherein:
the step 2) specifically comprises the following steps: the liquid storage tank body (4) rotates to drag the flowing resin (13) in the flowing shearing area, the flowing resin (13) generates fluid shearing force and reduces self viscosity, the circle center of a circular groove of the liquid storage tank body (4) is taken as the center, and the printing process is regulated and controlled through the shearing rates at different radial positions of the circular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311322650.3A CN117207517A (en) | 2023-10-13 | 2023-10-13 | Rotary liquid tank device and method for promoting continuous liquid interface printing resin backflow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311322650.3A CN117207517A (en) | 2023-10-13 | 2023-10-13 | Rotary liquid tank device and method for promoting continuous liquid interface printing resin backflow |
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| Publication Number | Publication Date |
|---|---|
| CN117207517A true CN117207517A (en) | 2023-12-12 |
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|---|---|---|---|
| CN202311322650.3A Pending CN117207517A (en) | 2023-10-13 | 2023-10-13 | Rotary liquid tank device and method for promoting continuous liquid interface printing resin backflow |
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| CN (1) | CN117207517A (en) |
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2023
- 2023-10-13 CN CN202311322650.3A patent/CN117207517A/en active Pending
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