3D printing equipment and printing method based on low-temperature sintering ceramic slurry

Abstract

The invention discloses 3D printing equipment based on low-temperature sintering ceramic slurry and a printing method.The printing equipment comprises a slurry intermediate tank, a double-screw conveying pump and a slurry outlet area adjustable slurry outlet head which are sequentially connected downwards in the vertical direction, the slurry intermediate tank is installed on a mechanical arm, and the double-screw conveying pump is in transmission connection with a driving mechanism; one end of the stirring rod is connected with the double-screw conveying pump, the other end of the stirring rod extends into the slurry intermediate tank, and the double-screw conveying pump is connected with an adjustable photocuring mechanism; according to the printing method, 3D printing of a product is conducted through the printing equipment. According to the 3D printer, the situation that photosensitive resin and other raw materials are distributed unevenly before 3D printing can be effectively avoided, the precision of 3D printing is improved, the precision of ultraviolet irradiation is ensured, a printed part is layered and cured, and the precision of a printed product is improved. The method is suitable for the technical field of low-temperature sintering ceramic slurry 3D printing.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing, and in particular relates to a 3D printing device and a printing method based on low-temperature sintered ceramic slurry. Background Art

[0002] 3D printing based on low-temperature sintering ceramic slurries is an emerging ceramic additive manufacturing technology. By mixing ceramic powder with low-temperature sintering aids, organic binders, and other agents to create a printable slurry, combined with 3D molding and subsequent low-temperature sintering, it enables the fabrication of complex ceramic devices. The molding techniques are categorized as direct writing, photocuring, and slurry jetting. Direct writing leverages the shear-thinning properties of the slurry, extruding and depositing it layer by layer through a micronozzle. This is suitable for slurries with high solids content. Photocuring involves adding a photosensitive resin to the slurry and curing it with UV light to create a layered mold. While this method offers high precision, it must consider the effect of ceramic particles on light scattering. Slurry jetting sprays the slurry onto a substrate in the form of droplets. This method is suitable for multi-material printing. Direct writing and slurry jetting methods cannot meet precision requirements and are generally used for devices with lower precision requirements. Furthermore, the slurry may not cure quickly after 3D printing, resulting in localized deformation. Therefore, photocuring is preferred for 3D printing of devices with higher precision requirements. However, in existing 3D printing equipment, the photosensitive resin in the slurry is prone to uneven distribution before printing. This means that when left standing, the photosensitive resin and other raw materials in the slurry will separate into layers. As a result, the printed slurry cannot fully cure under UV light, resulting in poor stability in the printed product. Furthermore, due to the high precision required for the product, the slurry outlets in existing 3D printing systems have a limited size and angle, which cannot meet the precision requirements. Furthermore, the UV light irradiation accuracy (angle, range, etc.) is insufficient, making it impossible to achieve the desired layered molding effect. Summary of the Invention

[0003] The present invention provides a 3D printing device and printing method based on low-temperature sintered ceramic slurry, which are used to avoid the uneven distribution of photosensitive resin and other raw materials before 3D printing, improve the accuracy of 3D printing, and ensure the accuracy of ultraviolet light irradiation, so that the printed parts are layered and solidified, thereby improving the accuracy of the printed products.

[0004] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A 3D printing device based on low-temperature sintered ceramic slurry includes a slurry intermediate tank, a twin-screw delivery pump and an adjustable slurry discharge head in the slurry discharge area, which are connected in sequence vertically downward. The slurry intermediate tank is installed on a robotic arm, and the twin-screw delivery pump is connected to a drive mechanism. One end of the stirring rod is connected to the twin-screw delivery pump, and the other end of the stirring rod extends into the slurry intermediate tank. An adjustable light curing mechanism is connected to the twin-screw delivery pump.

[0006] Furthermore, the slurry intermediate tank includes a vertical tank body connected to the robotic arm through a fixed seat, an upper end cover is detachably connected to the upper end of the vertical tank body, a slurry inlet joint and an exhaust pipe are constructed on the upper end cover, a slurry inlet pipe connected to the inlet end of the twin-screw conveying pump is constructed at the lower end of the vertical tank body, and a return pipe is connected to the outlet end of the twin-screw conveying pump, and the return pipe is connected to the vertical tank body.

[0007] Furthermore, the twin-screw conveying pump includes a pump casing detachably connected to the vertical tank body, and a transmission part, a feed part, a conveying part and a discharge part are constructed in sequence vertically downward inside the pump casing. The transmission part includes two mounting shafts arranged side by side, and the upper end of each mounting shaft extends out of the pump casing. Transmission gears are coaxially assembled on the two mounting shafts, and the two transmission gears are meshed with each other.

[0008] Furthermore, the driving mechanism includes a driving motor connected to the pump casing through an adapter, a first transmission wheel is coaxially mounted on the output shaft of the driving motor, and a second transmission wheel is coaxially mounted on one of the mounting shafts, the first transmission wheel and the second transmission wheel are connected via a transmission belt, and the lower end of the stirring rod is detachably connected to the upper end of the other mounting shaft.

[0009] Furthermore, the slurry discharge head with adjustable slurry discharge area includes a vertical joint, an assembly shell and a slurry discharge cap arranged in sequence along the vertical downward direction, and a pneumatic area adjustment unit is arranged in the assembly shell. The vertical joint is connected to the outlet end of the twin-screw conveying pump, and the slurry discharge cap is detachably connected to the pneumatic area adjustment unit.

[0010] Furthermore, the pneumatic zone adjustment unit includes an assembly body coaxially arranged in an assembly shell, a flow gap is formed between the outer peripheral surface of the assembly body and the inner peripheral wall of the assembly shell, a plurality of pneumatic opening and closing components are evenly assembled along the circumference of the lower end surface of the assembly body, and slurry outlet holes are opened on the slurry outlet cap and corresponding to each pneumatic opening and closing component.

[0011] Furthermore, a plurality of assembly grooves are evenly constructed on the lower end surface of the assembly body along its circumference, and the pneumatic opening and closing component includes an opening and closing part movably assembled in the corresponding assembly groove, and an installation groove is constructed at one end of the opening and closing part extending into the assembly groove, and a vertical spring is installed in the installation groove, and the two ends of the vertical spring are respectively connected to the opening and closing part and the assembly body, and a plurality of air guide tubes are evenly arranged on the assembly body along its circumference, and one end of each of the air guide tubes is connected to the corresponding assembly groove, and the other end of the air guide tube extends out of the assembly shell.

[0012] Furthermore, the upper end surface of the assembly gradually tilts downward from its center position toward the outer edge, and a connecting column is constructed at the center of the lower end surface of the assembly. The connecting column abuts against the upper end surface of the slurry discharge cap, and the connecting column and the slurry discharge cap are connected via connecting bolts.

[0013] Furthermore, the adjustable light-curing mechanism includes a guide rail connected to a circumferential adjustment component, the circumferential adjustment component is connected to a twin-screw conveying pump, a linear motor is mounted on the guide rail, a vertical electric cylinder is mounted on the linear motor, the electric cylinder rod of the vertical electric cylinder is hinged with a transfer rod, an oblique electric cylinder is hinged between the electric cylinder rod and the transfer rod, an angle adjustment motor is mounted on the end of the transfer rod away from the hinge point, an assembly seat is mounted on the output shaft of the angle adjustment motor, and a plurality of solid-state lasers are mounted on the assembly seat.

[0014] The present invention also discloses a printing method of the above-mentioned 3D printing device based on low-temperature sintered ceramic slurry, comprising the following steps:

[0015] Step 1. Control the supply pump to supply the slurry in the storage tank to the slurry intermediate tank;

[0016] Step 2. Control the drive mechanism to drive the twin-screw pump and the stirring rod. The twin-screw pump continuously supplies the slurry in the slurry intermediate tank to the adjustable slurry discharge head in the slurry discharge area. At the same time, the stirring rod is driven to stir the slurry in the slurry intermediate tank.

[0017] Step 3. According to the area to be printed, the adjustable slurry discharge head in the slurry discharge area is controlled to move so that the slurry is discharged from a predetermined area of the adjustable slurry discharge head in the slurry discharge area;

[0018] Step 4. Adjust the angle and position of the adjustable light curing mechanism so that it can perform light curing operations on the printed area.

[0019] Due to the above-mentioned structure, the present invention achieves a technical improvement over the prior art in that: by controlling the operation of the drive mechanism, the present invention drives the twin-screw conveying pump and the stirring rod to operate synchronously. The twin-screw conveying pump gradually conveys the slurry in the slurry intermediate tank to the adjustable slurry discharge head in the slurry discharge area. The stirring rod continuously stirs the slurry in the slurry intermediate tank, promoting the thorough mixing of the various raw materials that make up the slurry. In this way, the photosensitive resin in the slurry discharged from the adjustable slurry discharge head is homogenized in the slurry. Under the irradiation of ultraviolet light, the printed layer formed by the slurry can be quickly and fully cured. Due to the use of the adjustable slurry discharge head in the slurry discharge area, the discharge area of the robot arm and the adjustable slurry discharge head in the slurry discharge area can be adjusted according to parameters such as the shape and angle of the local part of the printed product, so that the slurry discharged from the adjustable slurry discharge head in the slurry discharge area prints the desired product shape. The adjustable light curing mechanism is synchronously adjusted so that the ultraviolet light emitted by the adjustable light curing mechanism effectively cures the printed slurry. In summary, the present invention can effectively avoid the uneven distribution of photosensitive resin and other raw materials before 3D printing, improve the accuracy of 3D printing, and ensure the accuracy of ultraviolet light irradiation, so that the printed parts are layered and solidified, thereby improving the accuracy of the printed products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0021] In the attached figure:

[0022] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0023] Figure 2 A cross-sectional view of the structure of an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A magnified view of the structure of part A in the middle;

[0025] Figure 4 for Figure 2 A magnified view of the structure of part B in the middle;

[0026] Figure 5 This is a schematic structural diagram of a slurry intermediate tank according to an embodiment of the present invention;

[0027] Figure 6 for Figure 5 A schematic diagram of the structure shown from another angle;

[0028] Figure 7 This is a partial structural diagram of the connection between the twin-screw delivery pump and the drive mechanism according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic structural diagram of the connection between the circumferential adjustment component and the twin-screw delivery pump in the adjustable light-curing mechanism according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the partially disassembled structure of the circumferential adjustment component and the twin-screw delivery pump in the adjustable light-curing mechanism according to an embodiment of the present invention;

[0031] Figure 10 This is a schematic structural diagram of an adjustable pulp discharge head in a pulp discharge area according to an embodiment of the present invention;

[0032] Figure 11 Schematic diagram of the structure of the pneumatic area adjustment unit in the pulp discharge head with adjustable pulp discharge area according to an embodiment of the present invention;

[0033] Figure 12 for Figure 11 A schematic diagram of the structure shown from another angle;

[0034] Figure 13 This is a structural schematic diagram of the pneumatic area adjustment unit in the pulp discharge head with adjustable pulp discharge area in an embodiment of the present invention in a disassembled state;

[0035] Figure 14 Schematic diagram of the structure of the assembly in the pneumatic zone adjustment unit according to an embodiment of the present invention;

[0036] Figure 15 This is a schematic structural diagram of the adjustable light curing mechanism according to an embodiment of the present invention after removing the circumferential adjustment component.

[0037] Labeled parts: 100-slurry intermediate tank, 101-vertical tank body, 102-upper end cover, 103-slurry inlet joint, 104-exhaust pipe, 105-exhaust control valve, 106-fixing seat, 107-adapter ring, 108-fixing ear, 200-twin screw conveying pump, 201-conveying part, 202-feeding part, 203-installation shaft, 204-transmission gear, 205-upper end cover, 206-discharge part , 207-discharge control valve, 208-pump housing, 209-feed connector, 300-drive mechanism, 301-drive motor, 302-first transmission wheel, 303-second transmission wheel, 304-transmission belt, 305-adapter, 400-adjustable slurry head in slurry discharge area, 401-vertical joint, 402-assembly shell, 403-slurry discharge cap, 404-slurry discharge hole, 405-assembly, 406-partition Rib, 407-assembly groove, 408-air guide tube, 409-connecting groove, 410-connecting column, 411-opening and closing piece, 412-installation groove, 413-vertical spring, 414-spring seat, 415-fixing bolt, 416-sealing gasket, 417-connecting bolt, 500-slurry inlet pipe, 501-slurry inlet control valve, 600-return pipe, 601-return control valve, 700-adjustable light curing mechanism, 701-guide rail, 702-guide channel, 703-linear motor, 704-vertical electric cylinder, 705-electric cylinder rod, 706-adapter rod, 707-oblique electric cylinder, 708-angle adjustment motor, 709-assembly seat, 710-solid-state laser, 711-power motor, 712-connecting gear, 713-sliding seat, 714-connecting ring gear, 715-annular sliding rail, 800-stirring rod. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0039] The present invention discloses a 3D printing device based on low temperature sintering ceramic slurry, such as Figure 1-15As shown, it includes a slurry intermediate tank 100, a twin-screw delivery pump 200, an adjustable slurry discharge head 400 in the slurry discharge area, a stirring rod 800, a driving mechanism 300, and an adjustable light curing mechanism 700. The slurry intermediate tank 100, the twin-screw delivery pump 200, and the adjustable slurry discharge head 400 in the slurry discharge area are connected in sequence in a vertical downward direction. The slurry intermediate tank 100 is detachably mounted on a robotic arm. The twin-screw delivery pump 200 is in transmission connection with the driving mechanism 300. One end of the stirring rod 800 is connected to the twin-screw delivery pump 200, and the other end of the stirring rod 800 extends into the slurry intermediate tank 100. The adjustable light curing mechanism 700 is connected to the twin-screw delivery pump 200. The robotic arm is mounted on a three-axis six-directional motion platform (mounted on the motion system of an existing 3D printer) to facilitate the movement of the robotic arm along the X, Y, and Z axes, so that it drives the printing device to print without blind spots. The working principle and advantages of the present invention are: the present invention controls the action of the driving mechanism 300 to drive the twin-screw conveying pump 200 and the stirring rod 800 to move synchronously, the twin-screw conveying pump 200 gradually conveys the slurry in the slurry intermediate tank 100 to the adjustable slurry discharge head 400 in the slurry discharge area, and the stirring rod 800 continuously stirs the slurry in the slurry intermediate tank 100, so as to promote the full mixing of the various raw materials constituting the slurry. In this way, the photosensitive resin in the slurry discharged from the adjustable slurry discharge head 400 in the slurry discharge area is homogenized in the slurry, and under the irradiation of ultraviolet light, the printed layer printed by the slurry can be quickly and fully cured. Since the present invention adopts an adjustable slurry discharge head 400 in the slurry discharge area, the slurry discharge area of the mechanical arm and the adjustable slurry discharge head 400 in the slurry discharge area can be adjusted according to the shape, angle and other parameters of the local part of the printed product, so that the slurry discharged from the adjustable slurry discharge head 400 in the slurry discharge area prints the required product shape, and the adjustable light curing mechanism 700 is adjusted synchronously so that the ultraviolet light emitted by the adjustable light curing mechanism 700 effectively cures the printed slurry. In summary, the present invention can effectively avoid the uneven distribution of photosensitive resin and other raw materials before 3D printing, improve the accuracy of 3D printing, and ensure the accuracy of ultraviolet light irradiation, so that the printed parts are layered and cured, improving the accuracy of the printed products.

[0040] As a preferred embodiment of the present invention, Figure 5 、 6As shown, the slurry intermediate tank 100 includes a vertical tank body 101 and an upper end cover 102. A fixing seat 106 is fixedly connected to the outer peripheral wall of the vertical tank body 101, and the fixing seat 106 is detachably connected to the robotic arm. The upper end cover 102 is detachably connected to the upper end of the vertical tank body 101, and a slurry inlet joint 103 and an exhaust pipe 104 are constructed on the upper end cover 102. An exhaust control valve 105 is installed on the exhaust pipe 104. The slurry inlet joint 103 is connected to the storage tank through a supply pump, and the storage tank contains slurry. In this embodiment, a slurry inlet pipe 500 is constructed at the lower end of the vertical tank body 101. The slurry inlet pipe 500 is interconnected with the inlet end of the twin-screw conveying pump 200, and a slurry inlet control valve 501 is installed on the slurry inlet pipe 500. The outlet of the twin-screw pump 200 is connected to a return pipe 600, which is in communication with the vertical tank 101. A return control valve 601 is installed on the return pipe 600. An adapter ring 107 is detachably connected to the lower end of the vertical tank 101. A plurality of fixing ears 108 are constructed at the lower end of the adapter ring 107. These fixing ears 108 are fixedly connected to the upper end of the twin-screw pump 200. The function of the slurry intermediate tank 100 of this embodiment is to provide a transfer station for the supply of slurry, ensure that the slurry can be printed stably, prevent the printed slurry from containing bubbles, and avoid the slurry from stratifying.

[0041] As a preferred embodiment of the present invention, Figure 2 、 3 As shown in Figures 8 and 9, the twin-screw conveying pump 200 includes a pump housing 208, an upper end cover 205, a transmission part, a feed part 202, a conveying part 201, and a discharge part 206. Among them, the upper end cover 205 is detachably mounted on the upper end of the pump housing 208. The upper end cover 205 is detachably connected to the fixing ear 108 on the adapter ring 107, thereby realizing a detachable connection between the pump housing 208 and the vertical tank body 101. The transmission part, feed part 202, conveying part 201, and discharge part 206 are sequentially constructed in the pump housing 208 along the vertical direction downward. A feed connector 209 is constructed on the pump housing 208 and located at the position of the feed part 202. The feed connector 209 is connected to the slurry intermediate tank 100 through the slurry inlet pipe 500. A discharge connector is constructed at the lower end of the discharge part 206, and a discharge control valve 207 is installed on the discharge connector. The transmission part of this embodiment includes two mounting shafts 203 arranged side by side, and the upper end of each mounting shaft 203 extends out of the upper end cover 205. A transmission gear 204 is coaxially assembled on each mounting shaft 203. The transmission gear 204 is located in the pump housing 208, and the two transmission gears 204 on the two mounting shafts 203 are meshed with each other.

[0042] As a preferred embodiment of the present invention, Figure 2 、 3As shown in Figures 7 and 8, the drive mechanism 300 includes a drive motor 301, a first transmission wheel 302, a second transmission wheel 303, and a transmission belt 304. The drive motor 301 is mounted on an adapter 305, which is fixedly connected to the pump housing 208. The first transmission wheel 302 is coaxially mounted on the output shaft of the drive motor 301, and the second transmission wheel 303 is coaxially mounted on one of the mounting shafts 203. The first and second transmission wheels 302, 303 are connected by a transmission belt 304. In this embodiment, the lower end of the stirring rod 800 is detachably connected to the upper end of another mounting shaft 203. The diameter of the lower portion of the slurry intermediate tank 100 tapers downward in the vertical direction. The stirring rod 800 extends into the slurry intermediate tank 100. The axis of the mounting shaft 203 connected to the stirring rod 800 coincides with the axis of the slurry intermediate tank 100. The stirring rod 800 can rotate and scrape the inner peripheral wall and bottom wall of the slurry intermediate tank 100, thereby disturbing the slurry in the slurry intermediate tank 100 while preventing the slurry from solidifying on the inner wall of the slurry intermediate tank 100. In this embodiment, the driving motor 301 is controlled to drive the twin-screw conveying pump 200 to convey the slurry through a pulley transmission mode, and at the same time drives the stirring rod 800 to rotate, thereby causing the stirring rod 800 to continuously disturb the slurry in the slurry intermediate tank 100 to ensure slurry homogeneity.

[0043] As a preferred embodiment of the present invention, Figure 2 、 4As shown in Figures 10, 11, 12, 13 and 14, the slurry discharge area adjustable slurry discharge head 400 includes a vertical joint 401, an assembly shell 402 and a slurry discharge cap 403, which are sequentially arranged in a vertical direction downward. A pneumatic area adjustment unit is arranged in the assembly shell 402. The vertical joint 401 is connected to the outlet end (discharge joint) of the twin-screw conveying pump 200, and the slurry discharge cap 403 is detachably connected to the pneumatic area adjustment unit. The specific structure of the pneumatic area adjustment unit is that the pneumatic area adjustment unit includes an assembly 405 and a plurality of pneumatic opening and closing components. The assembly 405 is coaxially arranged in the assembly shell 402, and an overflow gap is formed between the outer peripheral surface of the assembly 405 and the inner peripheral wall of the assembly shell 402, so that the slurry enters the assembly shell 402 from the vertical joint 401, and then enters the slurry discharge cap 403 from the overflow gap. The multiple pneumatic opening and closing components described in this embodiment are all movably assembled on the lower end surface of the assembly 405, and these pneumatic opening and closing components are evenly arranged along the circumference of the assembly 405. A slurry outlet hole 404 is opened on the slurry outlet cap 403 and corresponding to each pneumatic opening and closing component. When it is necessary to adjust the slurry extrusion area of the slurry outlet cap 403, the corresponding one or more pneumatic opening and closing components are controlled to operate so that the pneumatic opening and closing components open and close the slurry outlet hole 404 corresponding to the slurry outlet cap 403, ensuring that the slurry is squeezed out of the slurry cap 403 from a predetermined position. A concave cavity is formed at the lower end of the assembly 405 of this embodiment, and a plurality of partition ribs 406 are evenly constructed in the concave cavity along its circumference. Each partition rib 406 extends along the radial direction of the assembly 405, and an assembly groove 407 is formed between two adjacent partition ribs 406. Each pneumatic opening and closing component is movably assembled in the corresponding assembly groove 407. Specifically, the pneumatic opening and closing assembly includes an opening and closing member 411 and a vertical spring 413. The shape of the opening and closing member 411 is adapted to the assembly groove 407. A downward-extending mounting groove 412 is constructed on the upper end face of the opening and closing member 411. In this way, the opening and closing member 411 forms a shell-like structure with the upper end in an open state. The opening and closing member 411 is movably assembled in the assembly groove 407. The lower end of the vertical spring 413 is fixedly connected to the bottom wall of the mounting groove 412. A spring seat 414 is constructed at the upper end of the vertical spring 413. A connecting groove 409 is constructed on the assembly body 405 and on the top wall of the assembly groove 407. The spring seat 414 is assembled at the connecting groove 409, and the spring seat 414 is detachably connected to the assembly body 405 by a fixing bolt 415. A sealing gasket 416 is fixed at the lower end of the opening and closing member 411. In this embodiment, a plurality of air guide tubes 408 are evenly arranged along the circumference of the assembly body 405. One end of each air guide tube 408 is connected to the corresponding assembly groove 407, and the other end of the air guide tube 408 extends out of the assembly shell 402. A first solenoid valve is installed on each air guide tube 408, and each air guide tube 408 is connected to an air source. An air release pipe is constructed on each air guide tube 408, and a second solenoid valve is installed on the air release pipe.The working principle and advantages of this embodiment are as follows: when the area of slurry extrusion at the slurry discharge cap 403 needs to be adjusted, the corresponding opening and closing members 411 are driven by pressurized gas to close the corresponding slurry discharge holes 404, so that the slurry discharge holes 404 for slurry discharge are in a conductive state, so that the slurry can be continuously extruded from these unsealed slurry discharge holes 404. When the slurry discharge area needs to be changed, some of the opening and closing members 411 are deflated and another one or more opening and closing members 411 are inflated to achieve the purpose of switching the slurry discharge area.

[0044] As a preferred embodiment of the present invention, Figure 4 、 10 As shown, the upper end surface of the assembly 405 gradually slopes downward from its center toward the outer edge, thereby facilitating the smooth passage of slurry through the flow gap into the slurry discharge cap 403, thereby preventing slurry from accumulating at the upper end of the assembly 405. Furthermore, due to the special configuration of the upper end surface of the assembly 405, the slurry is extruded more smoothly from the slurry discharge cap 403, thereby avoiding variations in the slurry delivery speed that could result in excessive or insufficient extrusion. In this embodiment, a connecting post 410 is constructed at the center of the lower end surface of the assembly 405. The connecting post 410 abuts against the upper end surface of the slurry discharge cap 403, and the connecting post 410 is connected to the slurry discharge cap 403 via a connecting bolt 417.

[0045] As a preferred embodiment of the present invention, Figure 1 、 2As shown in Figures 8, 9, and 15, the adjustable light-curing mechanism 700 includes a circumferential adjustment assembly, a guide rail 701, a linear motor 703, a vertical electric cylinder 704, a transfer rod 706, an oblique electric cylinder 707, an angle adjustment motor 708, an assembly base 709, and multiple solid-state lasers 710. The circumferential adjustment assembly includes a power motor 711, a connecting gear 712 coaxially mounted on the output shaft of the power motor 711, a sliding base 713 fixed to the power motor 711, an annular sliding rail 715 and a connecting ring gear 714 coaxially fixed to the outside of the pump housing 208 of the twin-screw delivery pump 200, the sliding base 713 slidably mounted on the annular sliding rail 715, and the connecting gear 712 externally meshes with the connecting ring gear 714. The guide rail 701 of this embodiment is connected to a power motor 711. A guide channel 702 is constructed on the guide rail 701. A linear motor 703 is mounted on the guide channel 702 of the guide rail 701 and can move along the length of the guide channel 702. A vertical electric cylinder 704 is mounted on the linear motor 703. The end of the electric cylinder rod 705 of the vertical electric cylinder 704 is hinged to one end of the adapter rod 706. The ends of the oblique electric cylinder 707 are hinged to the electric cylinder rod 705 of the vertical electric cylinder 704 and the adapter rod 706, respectively. The angle adjustment motor 708 of this embodiment is mounted on the end of the adapter rod 706 away from the hinge point. The assembly base 709 is mounted on the output shaft of the angle adjustment motor 708. The aforementioned multiple solid-state lasers 710 are installed at intervals on the assembly base 709. The solid-state lasers 710 emit ultraviolet light to cure the printed slurry layer. The working principle and advantages of this embodiment are as follows: this embodiment achieves the purpose of adjusting the horizontal angle of the solid-state laser 710 by controlling the action of the power motor 711; adjusts the vertical position of the solid-state laser 710 by controlling the action of the vertical electric cylinder 704; controls the action of the linear motor 703 to move the solid-state laser 710 closer to or farther away from the slurry layer; controls the action of the oblique electric cylinder 707 to adjust the vertical tilt angle of the solid-state laser 710; and adjusts the light curing range by controlling the operation of one or more solid-state lasers 710. It can be seen that this embodiment can adjust the posture of the solid-state laser 710 by controlling the action of one or more of the above components and coordinating the action of the robotic arm, thereby ensuring that the solid-state laser 710 fully and quickly cures the printed slurry layer.

[0046] The present invention also discloses a printing method of the above-mentioned 3D printing device based on low-temperature sintered ceramic slurry, comprising the following steps:

[0047] Step 1. Control the supply pump to supply the slurry in the storage tank to the slurry intermediate tank 100;

[0048] Step 2. Control the drive mechanism 300 to operate, so that it drives the twin-screw pump 200 and the stirring rod 800 to operate. The twin-screw pump 200 continuously supplies the slurry in the slurry intermediate tank 100 to the adjustable slurry discharge head 400 in the slurry discharge area. At the same time, the stirring rod 800 is driven to stir the slurry in the slurry intermediate tank 100.

[0049] Step 3. According to the area to be printed, the adjustable slurry discharge head 400 is controlled to operate so that the slurry is discharged from a predetermined area of the adjustable slurry discharge head 400;

[0050] Step 4: Adjust the angle and position of the adjustable light-curing mechanism 700 so that it can perform light-curing operations on the printed area.

[0051] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A 3D printing device based on low-temperature sintered ceramic slurry, characterized by: It includes a slurry intermediate tank, a twin-screw conveying pump and an adjustable slurry discharge head in the slurry discharge area, which are connected in sequence vertically downward. The slurry intermediate tank is installed on a robotic arm, the twin-screw conveying pump is connected to the driving mechanism, one end of the stirring rod is connected to the twin-screw conveying pump, and the other end of the stirring rod extends into the slurry intermediate tank. An adjustable light curing mechanism is connected to the twin-screw conveying pump.

2. A 3D printing device based on low-temperature sintered ceramic slurry according to claim 1, characterized in that: The slurry intermediate tank includes a vertical tank body connected to the robotic arm through a fixed seat, an upper end cover is detachably connected to the upper end of the vertical tank body, a slurry inlet joint and an exhaust pipe are constructed on the upper end cover, a slurry inlet pipe connected to the inlet end of the twin-screw conveying pump is constructed at the lower end of the vertical tank body, and a return pipe is connected to the outlet end of the twin-screw conveying pump, and the return pipe is connected to the vertical tank body.

3. The 3D printing device based on low-temperature sintered ceramic slurry according to claim 1, characterized in that: The twin-screw conveying pump includes a pump casing detachably connected to a vertical tank body, and a transmission part, a feed part, a conveying part and a discharge part are constructed in sequence vertically downward inside the pump casing. The transmission part includes two mounting shafts arranged side by side, and the upper end of each mounting shaft extends out of the pump casing. Transmission gears are coaxially assembled on the two mounting shafts, and the two transmission gears are meshed with each other.

4. The 3D printing device based on low-temperature sintered ceramic slurry according to claim 3, characterized in that: The driving mechanism includes a driving motor connected to the pump casing through an adapter, a first transmission wheel is coaxially mounted on the output shaft of the driving motor, and a second transmission wheel is coaxially mounted on one of the mounting shafts, the first transmission wheel and the second transmission wheel are connected by a transmission belt, and the lower end of the stirring rod is detachably connected to the upper end of the other mounting shaft.

5. The 3D printing device based on low-temperature sintered ceramic slurry according to claim 1, characterized in that: The adjustable pulp discharge head in the pulp discharge area includes a vertical joint, an assembly shell and a pulp discharge cap arranged in sequence along the vertical downward direction. A pneumatic area adjustment unit is arranged in the assembly shell. The vertical joint is connected to the outlet end of the twin-screw conveying pump, and the pulp discharge cap is detachably connected to the pneumatic area adjustment unit.

6. The 3D printing device based on low-temperature sintered ceramic slurry according to claim 5, characterized in that: The pneumatic zone adjustment unit includes an assembly body coaxially arranged in an assembly shell, a flow gap is formed between the outer peripheral surface of the assembly body and the inner peripheral wall of the assembly shell, a plurality of pneumatic opening and closing components are evenly assembled along the circumference of the lower end surface of the assembly body, and slurry discharge holes are opened on the slurry discharge cap and corresponding to each pneumatic opening and closing component.

7. The 3D printing device based on low-temperature sintering ceramic slurry according to claim 6, characterized in that: A plurality of assembly grooves are uniformly constructed on the lower end surface of the assembly body along its circumference. The pneumatic opening and closing assembly includes an opening and closing part that is movably assembled in the corresponding assembly groove. An installation groove is constructed at one end of the opening and closing part that extends into the assembly groove. A vertical spring is installed in the installation groove. The two ends of the vertical spring are respectively connected to the opening and closing part and the assembly body. A plurality of air guide tubes are uniformly arranged on the assembly body along its circumference. One end of each air guide tube is connected to the corresponding assembly groove, and the other end of the air guide tube extends out of the assembly shell.

8. The 3D printing device based on low-temperature sintered ceramic slurry according to claim 6, characterized in that: The upper end surface of the assembly body gradually tilts downward from its center position toward the outer edge, and a connecting column is constructed at the center of the lower end surface of the assembly body. The connecting column abuts against the upper end surface of the slurry discharge cap, and the connecting column and the slurry discharge cap are connected via connecting bolts.

9. The 3D printing device based on low-temperature sintering ceramic slurry according to claim 1, characterized in that: The adjustable light-curing mechanism includes a guide rail connected to a circumferential adjustment component, the circumferential adjustment component is connected to a twin-screw conveying pump, a linear motor is mounted on the guide rail, a vertical electric cylinder is mounted on the linear motor, the electric cylinder rod of the vertical electric cylinder is hinged with a transfer rod, an oblique electric cylinder is hinged between the electric cylinder rod and the transfer rod, an angle adjustment motor is mounted on the end of the transfer rod away from the hinge point, an assembly seat is mounted on the output shaft of the angle adjustment motor, and multiple solid-state lasers are mounted on the assembly seat.

10. A printing method for a 3D printing device based on a low-temperature sintered ceramic slurry according to any one of claims 1 to 9, characterized in that: The steps include: Step 1. Control the supply pump to supply the slurry in the storage tank to the slurry intermediate tank; Step 2. Control the drive mechanism to drive the twin-screw pump and the stirring rod. The twin-screw pump continuously supplies the slurry in the slurry intermediate tank to the adjustable slurry discharge head in the slurry discharge area. At the same time, the stirring rod is driven to stir the slurry in the slurry intermediate tank. Step 3. According to the area to be printed, the adjustable slurry discharge head in the slurry discharge area is controlled to move so that the slurry is discharged from a predetermined area of the adjustable slurry discharge head in the slurry discharge area; Step 4. Adjust the angle and position of the adjustable light curing mechanism so that it can perform light curing operations on the printed area.

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