Photocuring stacking forming 3D printing device

Abstract

The invention discloses a photocuring stacking forming 3D printing device, and relates to the technical field of 3D printing. The device comprises a supporting framework, a built-in framework, a top plate, a resin pool and a bottom plate, the built-in framework is fixedly installed in the middle of the supporting framework, the top plate is fixedly installed at the top of the supporting framework, an ultraviolet laser source is arranged at the bottom of the top plate, the resin pool is fixedly installed in the middle of the built-in framework, and the bottom plate is fixedly installed at the bottom of the supporting framework. A scraper driving assembly is arranged at the top of the built-in framework, and a resin internal circulation assembly is arranged between the scraper driving assembly and the bottom plate; by arranging the scraper driving assembly and the resin internal circulation assembly, in the process that the scraper driving assembly drives a scraper to do transverse intermittent reciprocating motion, the resin internal circulation assembly draws a certain amount of resin solution from the bottom of the resin pool and discharges the equivalent circulated resin solution to the middle of the resin pool at the same time; and bubbles, precipitates and other defects are remarkably reduced, and the 3D printing quality is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and specifically to a stereolithography 3D printing device. Background Art

[0002] Stereolithography is a common 3D printing technology that uses liquid photosensitive resin and ultraviolet light, laser or light source to cure materials layer by layer to create three-dimensional objects. Stereolithography 3D printing is usually divided into two types: upward-pulling and downward-sinking. In a downward-sinking 3D printing device, the liquid resin is located in a container, and the light source irradiates from above to cure the resin layer by layer. After each layer of curing is completed, the platform will descend by the distance of one layer thickness, and then the next layer of curing will be carried out. In this way, during the descent of the platform, a squeegee will level and spread the resin on the liquid surface of the resin, so that a uniform layer of resin is formed on the platform;

[0003] In the stereolithography 3D printing technology, the manufacturing of parts is achieved by curing the resin layer by layer. Generally, the printed parts often need to go through a resin curing process of 2000 to 3000 layers. The curing time for each layer may vary from several seconds to dozens of seconds. The printing device takes a long time. The resin in the molten pool will stratify and precipitate after standing still for a long time, which will affect the uniformity of the subsequent printing layers and the strength and quality of the model. It is necessary to design a set of resin material circulation device to improve the fluidity of the resin material. Secondly, there is resin residue inside the circulation device after use. If it is not cleaned in time, it will cure and block the circulation device, affecting normal operation. Therefore, it is urgent to design a brand-new resin material circulation device to solve the above problems. In view of the above problems, the inventor proposes a stereolithography 3D printing device to solve the above problems. Summary of the Invention

[0004] In order to solve the problems of stratification and precipitation of resin after standing still for a long time and cleaning the inside of the circulation device; the purpose of the present invention is to provide a stereolithography 3D printing device.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A stereolithography D printing device includes a support skeleton, an internal skeleton, a top plate, a resin tank and a bottom plate. The internal skeleton is fixedly installed in the middle of the support skeleton, the top plate is fixedly installed on the top of the support skeleton, an ultraviolet laser source is provided at the bottom of the top plate, the resin tank is fixedly installed in the middle of the internal skeleton, the bottom plate is fixedly installed at the bottom of the support skeleton, a squeegee driving component is provided at the top of the internal skeleton, a resin internal circulation component is provided between the squeegee driving component and the bottom plate, a cleaning pipeline adjusting component that cooperates with the resin internal circulation component is provided at the top of the bottom plate, and a lifting platform component is provided at the top of the internal skeleton;

[0006] The resin internal circulation component includes a first cylinder and a second cylinder which are symmetrically distributed. A first piston is slidably arranged on the inner wall of the first cylinder, and a second piston is slidably arranged on the inner wall of the second cylinder. Connecting rods are rotatably arranged at the bottom ends of the first piston and the second piston. The top of the connecting rod is rotatably connected to a rotating arm. A liquid inlet pipe is connected through the bottom end of the resin tank, and one-way valves are connected through between the liquid inlet pipe and the first cylinder, and between the first cylinder and the second cylinder.

[0007] The cleaning pipeline adjusting component includes an adjusting chamber, which is fixedly installed on the top end of the bottom plate near one side of the second cylinder. A sliding rod is inserted through one side of the adjusting chamber close to the second cylinder. A valve core is fixedly arranged at the end of the sliding rod. A first control piston and a second control piston are respectively fixedly sleeved at both ends of the valve core. A spring is fixedly arranged at one end of the valve core away from the sliding rod, and the other end of the spring is fixedly connected to the inner wall of the adjusting chamber.

[0008] Preferably, the scraper driving component includes two symmetrically distributed side plates, which are respectively fixedly installed on the top end of the built-in skeleton and located on both sides of the resin tank. Sliders are slidably arranged at the top ends of the two side plates. Connecting plates are fixedly arranged at the top ends of the two sliders. A scraper is fixedly arranged between the two connecting plates. A guide plate is fixedly arranged at the top end of the left connecting plate. A rotating shaft is rotatably arranged between the built-in skeleton and the bottom plate near one side of the guide plate, and the rotating arm is fixedly installed at one end of the rotating shaft away from the guide plate. Two symmetrically distributed swing rods are fixedly sleeved on the outer wall of the rotating shaft, and the length of the outer swing rod is greater than that of the inner swing rod. A fixed rod is fixedly arranged between the two swing rods. A guide bolt is arranged at the end of the outer swing rod, and the guide bolt slides in the corresponding vertical groove in the guide plate. Slide rails are fixedly arranged at the top ends of the two side plates, and the two sliders slide in the corresponding slide rails respectively. A bearing seat is fixedly arranged on one side of the support skeleton close to the swing rod, and the rotating shaft is rotatably installed on the bearing seat. A motor bracket is fixedly arranged on one side of the bottom end of the built-in skeleton close to the swing rod. A first motor is fixedly arranged on the motor bracket. The driving end of the first motor is fixedly provided with a rotating disk. A cylindrical sliding frame is slidably sleeved on the outer wall of the fixed rod. A circular groove is formed on one side of the rotating disk, and the cylindrical sliding frame can slide along the inner wall of the circular groove in the circular groove of the rotating disk.

[0009] Preferably, the lifting platform component includes a fixed frame and a lead screw. The fixed frame is fixedly installed in the middle of the top end of the built-in skeleton. The lead screw is rotatably installed in the middle of the fixed frame. A stud is threadedly sleeved on the outer wall of the lead screw. A lifting platform is slidably arranged in the fixed frame, and the stud is fixedly installed in the middle of the lifting platform. Two symmetrically distributed fixed columns are fixedly arranged at the bottom end of one side of the lifting platform close to the resin tank. A printing platform is fixedly arranged at the bottom end of the fixed column. Two symmetrically distributed lifting guide rails are fixedly arranged on the inner wall of the fixed frame, and the lifting platform slides on the lifting guide rails. A second motor is fixedly arranged in the middle of the bottom end of the fixed frame, and the driving end of the second motor is fixedly connected to the lead screw.

[0010] Preferably, three circular cavities with the same diameter are arranged inside the adjustment chamber along the axis direction of the valve core, and the three circular cavities communicate with each other. A connecting pipe is connected to the middle cavity in a through manner, and a one-way valve is connected in a through manner between the connecting pipe and the second cylinder barrel. A shunt pipe is connected to the bottom of the cavity on one side of the slide rod in a through manner, and both ends of the shunt pipe are connected to the middle of the resin pool in a through manner. A drain pipe is connected to the bottom of the cavity on one side of the spring in a through manner, and the drain pipe is fixedly installed on the support frame. An electric cylinder is fixedly arranged on the top of the bottom plate near one side of the slide rod, and the driving end of the electric cylinder is fixedly connected to the slide rod.

[0011] Preferably, the one-way valve between the liquid inlet pipe and the first cylinder barrel allows liquid to flow from the liquid inlet pipe to the first cylinder barrel. The one-way valve between the first cylinder barrel and the second cylinder barrel allows liquid to flow from the first cylinder barrel to the second cylinder barrel. The one-way valve between the second cylinder barrel and the connecting pipe allows liquid to flow from the second cylinder barrel to the connecting pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. By setting the scraper driving component and the resin internal circulation component, when the scraper driving component drives the scraper to move horizontally in an intermittent reciprocating manner, the resin internal circulation component extracts a certain amount of resin solution from the bottom of the resin pool and discharges an equal amount of recycled resin solution to the middle of the resin pool at the same time. The scraping flat and the resin solution circulation cooperate with each other, significantly reducing the generation of bubbles, precipitates and other defects, and greatly improving the quality of 3D printing.

[0014] 2. By setting the cleaning pipeline adjustment component, the connecting pipe is respectively connected to the shunt pipe and the drain pipe through the cleaning adjustment component, so as to control the circulation or discharge of the solution in the resin pool. After printing, the cleaning liquid circulates in the resin tank, which can effectively clean the residual resin inside the resin pool and the circulation device, reduce the corrosion and blockage of the equipment, thus extending the service life of the equipment and reducing the maintenance cost of the equipment.

[0015] 3. By setting the scraper driving component and the resin internal circulation component, the horizontal intermittent reciprocating movement in the scraper driving component is changed into the intermittent reciprocating swing of the resin internal circulation component, without additionally setting a special driving source to drive the resin internal circulation component, reducing related driving components such as motors and controllers, simplifying the overall structure, and reducing the manufacturing and maintenance costs of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the overall structure of the present invention;

[0018] Figure 2 Exploded structure diagram of the built-in skeleton, resin tank and scraper drive assembly in the present invention;

[0019] Figure 3 Schematic diagram of the structure of the lifting platform assembly in the present invention;

[0020] Figure 4 Schematic diagram of the structure of the scraper drive assembly in the present invention;

[0021] Figure 5 Schematic diagram of the sectional structure of the resin tank in the present invention;

[0022] Figure 6 Schematic diagram of the structure of the resin internal circulation assembly in the present invention;

[0023] Figure 7 Schematic diagram of the structure of the cleaning pipeline adjustment assembly in the present invention;

[0024] Figure 8 Schematic diagram of the overall connection of the resin internal circulation assembly and the cleaning pipeline adjustment assembly in the present invention.

[0025] In the figure: 1, support skeleton; 2, built-in skeleton; 3, top plate; 4, resin pool; 5, bottom plate; 6, scraper drive assembly; 601, side plate; 602, slide rail; 603, slider; 604, connecting plate; 605, scraper; 606, guide plate; 607, bearing seat; 608, rotating shaft; 609, swing rod; 610, fixed rod; 611, motor bracket; 612, first motor; 613, rotating disk; 614, cylindrical sliding frame; 7, resin internal circulation assembly; 701, first cylinder barrel; 702, second cylinder barrel; 703, first piston; 704, second piston; 705, rotating arm; 706, connecting rod; 707, one-way valve; 708, liquid inlet pipe; 709, connecting pipe; 8, cleaning pipeline adjustment assembly; 801, adjustment bin; 802, slide bar; 803, valve core; 804, first control piston; 805, second control piston; 806, spring; 807, shunt pipe; 808, drain pipe; 809, electric cylinder; 9, lifting platform assembly; 901, fixed frame; 902, lead screw; 903, stud; 904, lifting platform; 905, fixed column; 906, printing platform; 907, second motor; 908, lifting guide rail. Detailed implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment: As Figure 1-8 shown, the present invention provides a technical solution: a light-curing stacking forming 3D printing device, including a support skeleton 1, a built-in skeleton 2, a top plate 3, a resin pool 4 and a bottom plate 5. The built-in skeleton 2 is fixedly installed in the middle of the support skeleton 1, the top plate 3 is fixedly installed on the top of the support skeleton 1, an ultraviolet laser source is arranged at the bottom of the top plate 3, the resin pool 4 is fixedly installed in the middle of the built-in skeleton 2, the bottom plate 5 is fixedly installed at the bottom of the support skeleton 1, a scraper drive assembly 6 is arranged at the top of the built-in skeleton 2, a resin internal circulation assembly 7 is arranged between the scraper drive assembly 6 and the bottom plate 5, a cleaning pipeline adjustment assembly 8 that cooperates with the resin internal circulation assembly 7 is arranged on the top of the bottom plate 5, and a lifting platform assembly 9 is arranged at the top of the built-in skeleton 2;

[0028] The resin internal circulation component 7 includes a first cylinder barrel 701 and a second cylinder barrel 702 that are symmetrically distributed. A first piston 703 is slidably arranged on the inner wall of the first cylinder barrel 701, and a second piston 704 is slidably arranged on the inner wall of the second cylinder barrel 702. Connecting rods 706 are rotatably arranged at the bottom ends of the first piston 703 and the second piston 704. A rotating arm 705 is rotatably connected to the top of the connecting rod 706. A liquid inlet pipe 708 is connected to the bottom end of the resin tank 4 in a penetrating manner. One-way valves 707 are connected in a penetrating manner between the liquid inlet pipe 708 and the first cylinder barrel 701, and between the first cylinder barrel 701 and the second cylinder barrel 702.

[0029] The cleaning pipeline adjusting component 8 includes an adjusting chamber 801. The adjusting chamber 801 is fixedly installed on the top end of the bottom plate 5 on one side close to the second cylinder barrel 702. A slide rod 802 is inserted through the side of the adjusting chamber 801 close to the second cylinder barrel 702 in a penetrating manner. A valve core 803 is fixedly arranged at the end of the slide rod 802. A first control piston 804 and a second control piston 805 are respectively fixedly sleeved at both ends of the valve core 803. A spring 806 is fixedly arranged at one end of the valve core 803 away from the slide rod 802, and the other end of the spring 806 is fixedly connected to the inner wall of the adjusting chamber 801.

[0030] By adopting the above technical solution, the resin in the resin tank 4 is circulated, effectively preventing resin stratification or precipitation and improving the printing quality. The first control piston 804 and the second control piston 805 are adjusted to facilitate the discharge of the resin during the circulation process, and at the same time facilitate the discharge of the cleaning liquid after circulating in the resin tank 4 during the cleaning process, improving the cleaning efficiency.

[0031] The scraper driving component 6 includes two symmetrically distributed side plates 601. The two side plates 601 are respectively fixedly installed at the top end of the built-in framework 2 and are located on both sides of the resin tank 4. Sliders 603 are slidably arranged at the top ends of the two side plates 601. Connecting plates 604 are fixedly arranged at the top ends of the two sliders 603. A scraper 605 is fixedly arranged between the two connecting plates 604. A guide plate 606 is fixedly arranged at the top end of the left connecting plate 604. A rotating shaft 608 is rotatably arranged between the built-in framework 2 and the bottom plate 5 on one side close to the guide plate 606, and the rotating arm 705 is fixedly installed at the end of the rotating shaft 608 away from the guide plate 606. Two symmetrically distributed swinging rods 609 are fixedly sleeved on the outer wall of the rotating shaft 608, and the length of the outer swinging rod 609 is greater than that of the inner swinging rod 609. A fixing rod 610 is fixedly arranged between the two swinging rods 609. A guide bolt is arranged at the end of the outer swinging rod 609, and the guide bolt slides in the corresponding vertical groove in the guide plate 606.

[0032] By adopting the above technical solution, the scraper 605 reciprocates to level the resin on the surface of the resin tank 4.

[0033] The lifting platform assembly 9 includes a fixed frame 901 and a lead screw 902. The fixed frame 901 is fixedly installed in the middle of the top end of the built-in skeleton 2. The lead screw 902 is rotatably installed in the middle of the fixed frame 901. A stud 903 is sleeved on the outer wall of the lead screw 902 in a threaded manner. A lifting table 904 is slidably arranged in the fixed frame 901, and the stud 903 is fixedly installed in the middle of the lifting table 904. Two symmetrically distributed fixed columns 905 are fixedly arranged at the bottom end of the lifting table 904 close to one side of the resin tank 4, and a printing platform 906 is fixedly arranged at the bottom end of the fixed column 905.

[0034] By adopting the above technical solution, the printing platform 906 can be adjusted in height according to design requirements to ensure the smooth progress of the printing process.

[0035] Three circular cavities with the same diameter are opened inside the adjustment chamber 801 along the axial direction of the valve core 803, and the three circular cavities communicate with each other. A connecting pipe 709 is connected to the middle cavity in a through manner, and a one-way valve 707 is connected in a through manner between the connecting pipe 709 and the second cylinder barrel 702. A shunt pipe 807 is connected to the bottom of the cavity on one side of the sliding rod 802 in a through manner, and both ends of the shunt pipe 807 are connected to the middle of the resin tank 4 in a through manner. A drain pipe 808 is connected to the bottom of the cavity on one side of the spring 806 in a through manner, and the drain pipe 808 is fixedly installed on the support skeleton 1.

[0036] By adopting the above technical solution, the connecting pipe 709, the shunt pipe 807 and the drain pipe 808 are respectively connected to the corresponding cavities in the adjustment chamber 801 in a through manner.

[0037] A bearing seat 607 is fixedly arranged on the support skeleton 1 close to one side of the swing rod 609, and a rotating shaft 608 is rotatably installed on the bearing seat 607.

[0038] By adopting the above technical solution, the rotating shaft 608 is rotatably installed on the bearing seat 607 to ensure the stability of the rotating shaft 608 during the rotation process.

[0039] A motor bracket 611 is fixedly arranged on the bottom end of the built-in skeleton 2 close to one side of the swing rod 609. A first motor 612 is fixedly arranged on the motor bracket 611. A rotating disk 613 is fixedly arranged at the driving end of the first motor 612. A cylindrical sliding frame 614 is slidably sleeved on the outer wall of the fixed rod 610. A circular groove is opened on one side of the rotating disk 613, and the cylindrical sliding frame 614 can slide along the inner wall of the circular groove in the circular groove of the rotating disk 613.

[0040] By adopting the above technical solution, the first motor 612 drives the rotating disk 613 to rotate, and the cylindrical sliding frame 614 can slide on the outer wall of the fixed rod 610 during the rotation of the rotating disk 613.

[0041] On the top end of the bottom plate 5, an electric cylinder 809 is fixedly arranged on one side close to the sliding rod 802, and the driving end of the electric cylinder 809 is fixedly connected to the sliding rod 802.

[0042] By adopting the above technical solution, the electric cylinder 809 is used to push the sliding rod 802 to move.

[0043] The one-way valve 707 between the liquid inlet pipe 708 and the first cylinder barrel 701 allows the liquid to flow from the liquid inlet pipe 708 to the first cylinder barrel 701. The one-way valve 707 between the first cylinder barrel 701 and the second cylinder barrel 702 allows the liquid to flow from the first cylinder barrel 701 to the second cylinder barrel 702. The one-way valve 707 between the second cylinder barrel 702 and the connecting pipe 709 allows the liquid to flow from the second cylinder barrel 702 to the connecting pipe 709.

[0044] By adopting the above technical solution, by setting three one-way valves 707, it is possible to prevent the resin in the first cylinder barrel 701 from flowing back to the resin tank 4, the resin in the second cylinder barrel 702 from flowing back to the first cylinder barrel 701, and the resin in the connecting pipe 709 and the adjustment chamber 801 from flowing back to the second cylinder barrel 702.

[0045] On the top ends of both side plates 601, slide rails 602 are fixedly arranged, and two sliders 603 slide in the corresponding slide rails 602 respectively.

[0046] By adopting the above technical solution, the slider 603 is guided by the slide rail 602 to move.

[0047] On the inner wall of the fixed frame 901, two symmetrically distributed lifting guide rails 908 are fixedly arranged, and the lifting platform 904 slides on the lifting guide rails 908. In the middle of the bottom end of the fixed frame 901, a second motor 907 is fixedly arranged, and the driving end of the second motor 907 is fixedly connected to the lead screw 902.

[0048] By adopting the above technical solution, the lifting platform 904 is guided by the lifting guide rails 908 to perform lifting movement.

[0049] Working principle: First, pour the photocuring resin into the resin tank 4, as Figure 3As shown in the figure, control the second motor 907 to drive the lead screw 902 to rotate forward. The lead screw 902 drives the printing platform 906 to rise to the corresponding printing position under the guidance of the lifting guide rail 908 through the stud 903, the lifting table 904, and the fixed column 905. Then, the ultraviolet light source irradiates the photocurable resin for curing reaction. After each irradiation of the ultraviolet light source, control the lead screw 902 to rotate reversely to drive the printing platform 906 to move downward by the thickness of a single layer according to the set height. At the same time, control the first motor 612 to rotate half a turn. The rotation of the first motor 612 drives the swing rod 609 to swing from one extreme position to the other extreme position along the established arc track with the rotation axis 608 as the center through the rotating disk 613, the cylindrical sliding frame 614, and the fixed rod 610. During the swinging process of the swing rod 609, the guide plate 606 drives the squeegee 605 to move to the other extreme position under the guidance of the slide rail 602 to level the resin layer for the next irradiation. During this process, while the swing rod 609 swings, it drives the rotation axis 608 to rotate counterclockwise. The rotation of the rotation axis 608 drives the first piston 703 to lift upward and the second piston 704 to descend through the two connecting rods 706. Since the lifting of the first piston 703 reduces the pressure inside the first cylinder 701, it forces the photocurable resin in the resin pool 4 to be pressed into the first cylinder 701 through the liquid inlet pipe 708 and the one-way valve 707. The descent of the second piston 704 increases the pressure inside the second cylinder 702, forcing the photocurable resin in the second cylinder 702 to enter the cavity in the adjustment chamber 801 through the one-way valve 707 and the connecting pipe 709. The pressure inside the cavity of the adjustment chamber 801 increases, forcing the photocurable resin inside the adjustment chamber 801 to be discharged and refluxed to the resin pool 4 through both ends of the shunt pipe 807;

[0050] When the ultraviolet light source irradiates and cures for the next time, the first motor 612 drives the rotating disk 613 to continue rotating half a turn. The rotating disk 613 drives the swing rod 609 and the squeegee 605 back to the initial position according to the same steps above. During this process, the swing rod 609 drives the rotating arm 705 to rotate to the initial position. At this time, the rotating arm 705 drives the first piston 703 to descend and the second piston 704 to lift through the two connecting rods 706. The pressure between the first cylinder 701 and the second cylinder 702 is balanced, forcing the photocurable resin in the first cylinder 701 to enter the second cylinder 702 through the one-way valve 707. Thus, a cycle of photocurable resin is completed, and printing is carried out in such a reciprocating cycle;

[0051] When it is necessary to discharge the photocurable resin after printing is completed, as Figure 7As shown, the driving end of the control electric cylinder 809 extends. The electric cylinder 809 drives the first control piston 804 and the second control piston 805 to move through the slide bar 802 and the valve core 803 and squeezes the spring 806, so that the first control piston 804 blocks the cavity communicating with one side of the shunt pipe 807, and the second control piston 805 slides out of the cavity communicating with the drain pipe 808. According to the same steps above, control the first motor 612 to rotate continuously for the photocuring resin circulation, and discharge the photocuring resin entering the adjustment chamber 801 from the drain pipe 808. After the photocuring resin is discharged, it is necessary to clean the inside of the circulation component. Pour the cleaning liquid into the resin tank 4 to clean the inner wall of the resin tank 4. The cleaning liquid after cleaning accumulates in the resin tank 4. After cleaning, control the driving end of the electric cylinder 809 to contract so that the connecting pipe 709 communicates with the shunt pipe 807, so that the cleaning liquid circulates in the first cylinder 701, the second cylinder 702, the adjustment chamber 801 and the resin tank 4 to clean the inside. After the circulation is completed, control the driving end of the electric cylinder 809 to extend so that the connecting pipe 709 communicates with the drain pipe 808, and perform circulation to discharge the cleaning liquid.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A stereolithography 3D printing device, comprising a support framework (1), an internal framework (2), a resin tank (4) and a bottom plate (5), characterized in that: The built-in skeleton (2) is fixedly installed in the middle of the support skeleton (1), the resin tank (4) is fixedly installed in the middle of the built-in skeleton (2), the bottom plate (5) is fixedly installed at the bottom of the support skeleton (1), a scraper driving assembly (6) is arranged at the top of the built-in skeleton (2), a resin internal circulation assembly (7) is arranged between the scraper driving assembly (6) and the bottom plate (5), and a cleaning pipeline adjusting assembly (8) is arranged at the top of the bottom plate (5); The resin internal circulation assembly (7) includes a first cylinder barrel (701) and a second cylinder barrel (702) for driving the resin to circulate. A first piston (703) and a second piston (704) are respectively and slidably arranged on the inner walls of the first cylinder barrel (701) and the second cylinder barrel (702); The cleaning pipeline adjusting assembly (8) includes an adjusting bin (801). The adjusting bin (801) is fixedly installed at the top end of the bottom plate (5) on the side close to the second cylinder barrel (702). A slide rod (802) is inserted through the side of the adjusting bin (801) close to the second cylinder barrel (702). A valve core (803) is fixedly arranged at the end of the slide rod (802). A first control piston (804) and a second control piston (805) are respectively and fixedly sleeved at both ends of the valve core (803).

2. The stereolithography additive manufacturing 3D printing device according to claim 1, wherein, Connecting rods (706) are rotatably arranged at the bottom ends of the first piston (703) and the second piston (704). A rotating arm (705) is rotatably connected to the top of the connecting rod (706). A liquid inlet pipe (708) is connected to the bottom end of the resin tank (4) in a penetrating manner. One-way valves (707) are connected in a penetrating manner between the liquid inlet pipe (708) and the first cylinder barrel (701), and between the first cylinder barrel (701) and the second cylinder barrel (702).

3. The stereolithography-based 3D printing device according to claim 1, characterized in that, The scraper driving assembly (6) includes two symmetrically distributed side plates (601). The two side plates (601) are respectively fixedly installed at the top end of the built-in skeleton (2) and on both sides of the resin tank (4). Sliders (603) are slidably arranged at the top ends of the two side plates (601). Connecting plates (604) are fixedly arranged at the top ends of the two sliders (603). A scraper (605) is fixedly arranged between the two connecting plates (604). A guide plate (606) is fixedly arranged at the top end of the left connecting plate (604); A rotating shaft (608) is rotatably arranged between the built-in skeleton (2) and the bottom plate (5) on the side close to the guide plate (606). The rotating arm (705) is fixedly installed at one end of the rotating shaft (608) away from the guide plate (606). Two symmetrically distributed swing rods (609) are fixedly sleeved on the outer wall of the rotating shaft (608). The length of the outer swing rod (609) is greater than that of the inner swing rod (609). A fixing rod (610) is fixedly arranged between the two swing rods (609). A guide bolt is arranged at the end of the outer swing rod (609), and the guide bolt slides in the corresponding vertical groove in the guide plate (606).

4. The stereolithography 3D printing device according to claim 1, wherein At the top of the built-in skeleton (2), there is a lifting platform assembly (9). The lifting platform assembly (9) includes a fixed frame (901) and a lead screw (902). The fixed frame (901) is fixedly installed in the middle of the top end of the built-in skeleton (2). The lead screw (902) is rotatably installed in the middle of the fixed frame (901). A stud (903) is sleeved on the outer wall of the lead screw (902) in a threaded manner. A lifting table (904) is slidably arranged in the fixed frame (901), and the stud (903) is fixedly installed in the middle of the lifting table (904). At the bottom end of the side of the lifting table (904) close to the resin tank (4), two symmetrically distributed fixed columns (905) are fixedly provided. At the bottom ends of the fixed columns (905), a printing platform (906) is fixedly provided.

5. The stereolithography-based 3D printing device according to claim 1, wherein One end of the valve core (803) far from the sliding rod (802) is fixedly provided with a spring (806), and the other end of the spring (806) is fixedly connected to the inner wall of the adjustment chamber (801); Inside the adjustment chamber (801), three circular cavities with the same diameter are opened along the axial direction of the valve core (803), and the three circular cavities communicate with each other. A connecting pipe (709) is connected to the middle cavity in a through manner, and a one-way valve (707) is connected in a through manner between the connecting pipe (709) and the second cylinder barrel (702). A shunt pipe (807) is connected to the bottom of the cavity on one side of the sliding rod (802) in a through manner, and both ends of the shunt pipe (807) are connected to the middle of the resin tank (4) in a through manner. A drain pipe (808) is connected to the bottom of the cavity on one side of the spring (806) in a through manner, and the drain pipe (808) is fixedly installed on the support skeleton (1).

6. The stereolithography 3D printing device according to claim 3, wherein, At the top ends of the two side plates (601), slide rails (602) are fixedly provided, and the two sliders (603) slide in the corresponding slide rails (602) respectively; A bearing seat (607) is fixedly provided on the side of the support skeleton (1) close to the swing rod (609), and a rotating shaft (608) is rotatably installed in the bearing seat (607); At the bottom end of the built-in skeleton (2) on the side close to the swing rod (609), a motor bracket (611) is fixedly provided. A first motor (612) is fixedly provided on the motor bracket (611). The driving end of the first motor (612) is fixedly provided with a rotating disc (613). A cylindrical sliding frame (614) is slidably sleeved on the outer wall of the fixed rod (610). A circular groove is opened on one side of the rotating disc (613), and the cylindrical sliding frame (614) can slide along the inner wall of the circular groove in the circular groove of the rotating disc (613).

7. The stereolithography additive manufacturing 3D printing device according to claim 1, wherein, An electric cylinder (809) is fixedly provided on the top end of the bottom plate (5) on the side close to the sliding rod (802), and the driving end of the electric cylinder (809) is fixedly connected to the sliding rod (802).

8. The stereolithography 3D printing device according to claim 2, characterized in that, The one-way valve (707) between the liquid inlet pipe (708) and the first cylinder barrel (701) allows liquid to flow from the liquid inlet pipe (708) to the first cylinder barrel (701). The one-way valve (707) between the first cylinder barrel (701) and the second cylinder barrel (702) allows liquid to flow from the first cylinder barrel (701) to the second cylinder barrel (702). The one-way valve (707) between the second cylinder barrel (702) and the connecting pipe (709) allows liquid to flow from the second cylinder barrel (702) to the connecting pipe (709).

9. The stereolithography additive manufacturing 3D printing apparatus according to claim 4, wherein Two symmetrically distributed lifting guide rails (908) are fixedly arranged on the inner wall of the fixed frame (901), and the lifting platform (904) slides on the lifting guide rails (908). A second motor (907) is fixedly arranged in the middle of the bottom end of the fixed frame (901), and the driving end of the second motor (907) is fixedly connected to the lead screw (902).

10. A stereolithography 3D printing device according to claim 3, characterized in that, A top plate (3) is fixedly installed at the top of the support skeleton (1), and an ultraviolet laser source is arranged at the bottom of the top plate (3).

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