Screw type 3D printing forming head

Abstract

The utility model discloses a screw type 3D printing forming head, which relates to the 3D printing equipment field, and comprises a slurry nozzle and an extrusion screw, the extrusion screw is rotatably connected in the slurry nozzle and is coaxially arranged, the center of the extrusion screw is provided with a fiber via hole, the upper side wall of the slurry nozzle is provided with a feed pipe, one side of the slurry nozzle is provided with a motor, and the motor is connected with the extrusion screw. A rotating shaft of the motor is in transmission connection with the extrusion screw through a transmission assembly; a cavity between the slurry nozzle and the extrusion screw is filled with ceramic slurry, and reinforced fibers are arranged in the fiber via holes; an annular illumination assembly is connected to the peripheral wall of the slurry spray head. The curing device is ingenious in conception, compact and reasonable in layout and convenient and fast to operate, the illumination effect is guaranteed through the annularly-designed illumination assembly, and the curing speed is increased; and through the design of the extrusion screw, the printing continuity is guaranteed, meanwhile, the stability of a printed product is improved, and the mechanical property of the printed product is effectively improved through the combination of the fibers and the ceramic slurry.

Description

Technical Field

[0001] The utility model relates to the field of 3D printing equipment, in particular to a screw-type 3D printing molding head. Background Art

[0002] 3D printing combines computer-aided design, material processing and molding technology. It is a manufacturing technology that uses digital model files as the basis, and uses software and numerical control systems to stack special metal materials, non-metallic materials and medical biomaterials layer by layer in the form of extrusion, sintering, melting, light curing, spraying, etc. to produce physical objects. Ceramics have many advantages such as high temperature resistance, corrosion resistance, high strength, and good wave transmission performance. 3D printing technology has the advantages of high molding accuracy, complex structure, and fast preparation. The development of 3D printing technology has brought new development opportunities for the molding technology of ceramic materials.

[0003] Traditional ceramics have poor toughness and usually need to be toughened. The current method is to add chopped fibers for reinforcement, but the performance improvement is limited. Continuous fiber reinforced ceramics can greatly improve the toughness of the ceramics themselves. Among them, a type of fiber ceramic slurry containing photocurable materials needs to be combined with ultraviolet light during printing to achieve rapid curing and ensure the molding effect.

[0004] How to provide an adjustable screw-type 3D printing molding head with good lighting has become a technical problem that needs to be solved urgently by technicians in this field. Utility Model Content

[0005] The utility model aims to provide a screw-type 3D printing molding head to solve the problem that a fixed light-emitting point cannot be adjusted and uneven illumination affects the curing effect.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model discloses a screw-type 3D printing molding head, comprising a slurry nozzle and an extrusion screw, wherein the extrusion screw is rotatably connected in the slurry nozzle and coaxially arranged, a fiber through hole is provided in the center of the extrusion screw, a feed pipe is provided on the upper wall of the slurry nozzle, a motor is provided on one side of the slurry nozzle, and the rotating shaft of the motor is transmission-connected to the extrusion screw through a transmission component; the cavity between the slurry nozzle and the extrusion screw is filled with ceramic slurry through the feed pipe, and reinforcing fibers are arranged in the fiber through hole of the extrusion screw; an annular illumination component is connected to the outer peripheral wall of the slurry nozzle, the illumination component is electrically connected to an ultraviolet light source, and a light-emitting surface of the illumination component faces a molding workbench.

[0008] Preferably, a trumpet-shaped guide tube is provided at the top end of the extrusion screw, the fixed end of the reinforcing fiber is wound around an external fiber shaft, and the free end of the reinforcing fiber passes through the guide positioning wheel, the guide tube, and the fiber through hole of the extrusion screw in sequence to the bottom of the slurry nozzle; a guide tube for material printing and molding is provided at the bottom of the slurry nozzle.

[0009] Preferably, the guide positioning wheel comprises a fixed wheel and an adjustable wheel arranged at the same height, the fixing hole of the adjustable wheel is set as a waist-shaped hole, and the positioning shaft of the adjustable wheel moves linearly along the waist-shaped hole when the position is adjusted.

[0010] Preferably, the transmission assembly includes a driving gear and a driven gear meshing with each other, the top end of the extrusion screw penetrates the top cover of the slurry nozzle and is connected to the driven gear, and the driving gear is connected to the rotating shaft of the motor.

[0011] Preferably, a bearing is installed between the top end of the extrusion screw and the top cover of the slurry nozzle.

[0012] Preferably, the illumination assembly adopts an ultraviolet emitter, and the ultraviolet emitter is fastened to the bottom of the side wall of the slurry nozzle through a transfer rod assembly and a positioning assembly, and the ultraviolet emitter is electrically connected to the ultraviolet light source.

[0013] Preferably, the positioning assembly includes a first positioning ring and a second positioning ring, one end of the first positioning ring and the second positioning ring are connected together in an openable and closable manner via a hinge shaft, one end of the first positioning ring and the second positioning ring are configured as locking ends for positioning, and after the locking ends are aligned, they are connected together via a bolt assembly, a pin or a magnetic block.

[0014] Preferably, the transfer rod assembly includes an upper rod and a lower rod, one end of the upper rod is connected to the first positioning ring and the second positioning ring, the other end of the upper rod is hinged to the top end of the lower rod, and the bottom end of the lower rod is positioned and connected to the ultraviolet emitter through a connecting claw.

[0015] Preferably, the ultraviolet emitter includes an emitting body and a single-layer shell for shading, the single-layer shell is connected to the connecting claw, the emitting body is snapped into the single-layer shell, the single-layer shell covers the top of the emitting body and has an opening direction to the lower side.

[0016] Preferably, the ultraviolet emitter includes an emitting body and a double-layer shell for shading, the double-layer shell includes a positioning outer shell and a rotating inner shell, the emitting body is snapped into the positioning outer shell, the positioning outer shell is positioned and connected to the connecting claw, the rotating inner shell can be rotatably embedded and connected to the inside of the positioning outer shell, the positioning outer shell and the rotating inner shell cooperate with each other and cover the top of the emitting body, and the opening direction of the positioning outer shell and the rotating inner shell after cooperating with each other is sideward and downward.

[0017] Compared with the prior art, the beneficial technical effects of the utility model are:

[0018] The utility model discloses a screw-type 3D printing molding head, comprising a slurry nozzle and an extrusion screw, which are coaxially arranged, a fiber through hole is provided in the center of the extrusion screw, a feed pipe is provided on the upper wall of the slurry nozzle, a motor is provided on one side of the slurry nozzle, and the rotating shaft of the motor is connected to the extrusion screw through a transmission component; an annular lighting component is connected to the outer peripheral wall of the slurry nozzle, the lighting component is electrically connected to the ultraviolet light source, and the light-emitting surface of the lighting component faces the molding workbench. During the 3D printing operation, the cavity between the slurry nozzle and the extrusion screw is filled with ceramic slurry, and reinforcing fibers are arranged in the fiber through hole, and the strength of the product after the ceramic slurry is formed is effectively improved by the increase of fibers.

[0019] 1) The design of the annular ultraviolet emitter can provide sufficient illumination effect for the ceramic slurry added with photosensitive materials during 3D printing, accelerate molding positioning, and ensure the molding effect of the product;

[0020] 2) The ultraviolet emitter includes an emitter body and a single-layer shell or double-layer shell for shading, which cooperates with the hinged transfer rod assembly to form an adjustable structure. The baffles on both sides prevent the light from irradiating upwards. At the same time, the opening direction is adjusted to achieve specific control of the illumination range, which is convenient and quick to operate;

[0021] 3) The motor starts to drive the extrusion screw to rotate, extruding the ceramic slurry into shape. By controlling the speed of the motor, the output speed of 3D printing can be conveniently controlled.

[0022] The utility model has an ingenious conception, a compact and reasonable layout, and is convenient and quick to operate. The annular design of the lighting component ensures the lighting effect and improves the curing speed; the design of the extrusion screw ensures the continuity of printing and improves the stability of the printed product. The combination of fiber and ceramic slurry effectively improves the mechanical properties of the printed product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings.

[0024] Figure 1This is a schematic diagram of the screw-type 3D printing molding head of the utility model;

[0025] Figure 2 This is a top view schematic diagram of the lighting assembly of the utility model;

[0026] Figure 3 This is a cross-sectional view of the connection of the positioning assembly of the utility model;

[0027] Figure 4 This is a schematic diagram of an ultraviolet emitter of the utility model;

[0028] Figure 5 This is a second schematic diagram of the ultraviolet emitter of the utility model;

[0029] Description of reference numerals: 100, ceramic slurry; 200, reinforcing fiber; 201, guide positioning wheel; 202, fiber shaft;

[0030] 1. Slurry nozzle; 101. Guide pipe; 2. Extrusion screw; 3. Feed pipe; 4. Transmission assembly; 401. Driving gear; 402. Driven gear; 5. Motor; 2-1. Bearing;

[0031] 6. Positioning assembly; 601. first positioning ring; 602. second positioning ring; 603. hinge shaft; 604. locking end;

[0032] 7. Transfer rod assembly; 701. Upper rod; 702. Lower rod; 703. Connecting claw;

[0033] 8. Ultraviolet emitter; 801. emitter body; 802. single-layer shell; 803. positioning outer shell; 804. rotating inner shell;

[0034] 9. Molding workbench. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] like Figure 1-5As shown, a screw-type 3D printing molding head includes a slurry nozzle 1 and an extrusion screw 2, the extrusion screw 2 is rotatably connected in the slurry nozzle 1 and arranged coaxially, a fiber through hole is opened in the center of the extrusion screw 2, a feed pipe 3 is opened on the upper side wall of the slurry nozzle 1, a motor 5 is arranged on one side of the slurry nozzle 1, and the rotating shaft of the motor 5 is connected to the extrusion screw 2 through a transmission component 4; the cavity between the slurry nozzle 1 and the extrusion screw 2 is filled with ceramic slurry 100 through the feed pipe 3, and the fiber through hole of the extrusion screw 2 is arranged with reinforcing fiber 200; an annular lighting component is connected to the outer peripheral wall of the slurry nozzle 1, the lighting component is electrically connected to the ultraviolet light source, and the light-emitting surface of the lighting component faces the molding workbench 9. Specifically, in order to reduce the bubbles in the ceramic slurry 100, a screen can be added on the inlet side of the feed pipe 3, and some bubbles are separated and escaped through the screening effect of the screen.

[0037] Specifically, the design of the annular lighting component can provide sufficient and uniform ultraviolet light for ceramic slurry added with photosensitive materials during 3D printing, so that the lighting effect in all directions is consistent, accelerating molding positioning and ensuring the molding effect of the product.

[0038] Specifically, a trumpet-shaped guide tube is provided at the top of the extrusion screw 2, the fixed end of the reinforcing fiber 200 is wound around the external fiber shaft 202, and the free end of the reinforcing fiber 200 passes through the guide positioning wheel 201, the guide tube, and the fiber through hole of the extrusion screw 2 in sequence to the bottom of the slurry nozzle 1; a guide tube 101 for material printing and molding is provided at the bottom of the slurry nozzle 1.

[0039] The guide positioning wheel 201 includes a fixed wheel and an adjustable wheel arranged at the same height, the fixed hole of the adjustable wheel is set as a waist-shaped hole, and the positioning shaft of the adjustable wheel moves linearly along the waist-shaped hole when the position is adjusted. Specifically, the guide positioning wheel 201 can play a positioning function, and can also achieve an active conveying function by adding a driving motor, further making the conveying of the reinforcing fiber 200 smoother.

[0040] Specifically, the transmission assembly 4 includes a driving gear 401 and a driven gear 402 that mesh with each other. The top end of the extrusion screw 2 passes through the top cover of the slurry nozzle 1 and is connected to the driven gear 402. The driving gear 401 is connected to the rotating shaft of the motor 5. A bearing 2-1 is installed between the top end of the extrusion screw 2 and the top cover of the slurry nozzle 1. The design of the bearing makes the rotation motion smoother and prolongs its service life. In one embodiment, Figure 1As shown, both the driving gear 401 and the driven gear 402 are bevel gears, and the motor can be installed horizontally. In actual use, the specific position and structure of the transmission component 4 can be selected according to needs.

[0041] Specifically, the illumination assembly adopts an ultraviolet emitter 8, which is fastened to the bottom of the side wall of the slurry nozzle 1 through a transfer rod assembly 7 and a positioning assembly 6, and the ultraviolet emitter 8 is electrically connected to the ultraviolet light source. Specifically, the number of transfer rod assemblies 7 is set to two or three to ensure the stability of the connection and positioning of the bottom ultraviolet emitter 8.

[0042] like Figure 2-3 As shown, the positioning assembly 6 includes a first positioning ring 601 and a second positioning ring 602, one end of the first positioning ring 601 and the second positioning ring 602 are connected together in an openable and closable manner through a hinge shaft 603, one end of the first positioning ring 601 and the second positioning ring 602 is set as a locking end 604 for positioning, and the locking ends 604 are connected together through bolt assemblies, pins or magnetic blocks after alignment. Specifically, the first positioning ring 601 and the second positioning ring 602, and the ultraviolet emitter 8 are all set to be arc-shaped. And the positioning connection of this structure is convenient and quick, and the height direction adjustment operation of the illumination assembly can also be achieved by adjusting the fastening position on the slurry nozzle 1.

[0043] Specifically, the transfer rod assembly 7 includes an upper rod 701 and a lower rod 702, one end of the upper rod 701 is connected to the first positioning ring 601 and the second positioning ring 602, the other end of the upper rod 701 is hinged to the top of the lower rod 702, and the bottom end of the lower rod 702 is positioned and connected to the ultraviolet emitter 8 through a connecting claw 703. The hinged connection between the upper rod 701 and the lower rod 702 realizes the rotation adjustment of the ultraviolet emitter 8, and the adjustment operation is fast and simple, so that the lighting effect in each direction is consistent, the molding positioning is accelerated, and the molding effect of the product is guaranteed.

[0044] like Figure 4 As shown, in one embodiment, the ultraviolet emitter 8 includes an emitting body 801 and a single-layer shell 802 for shading, the single-layer shell 802 is connected to the connecting claw 703, the emitting body 801 is snapped into the single-layer shell 802, and the single-layer shell 802 covers the top of the emitting body 801 and the opening direction is to the lower side.

[0045] Specifically, the cross-section of the single-layer shell 802 is set to be Ω-shaped, and a light-blocking plate is provided at the opening to prevent light from radiating upward; in addition, the emitting body 801 and the single-layer shell 802 are both set to be C-shaped, and the overall combination is ring-shaped, so that the illuminated surface is ring-shaped and converges toward the center; this structure ensures that the periphery of the formed cylinder can obtain sufficient and uniform ultraviolet light during printing, so that the lighting effect in all directions is consistent, the molding positioning is accelerated, and the molding effect of the product is guaranteed.

[0046] like Figure 5 As shown, in another embodiment, the ultraviolet emitter 8 includes an emitting body 801 and a double-layer shell for shading, the double-layer shell includes a positioning shell 803 and a rotating inner shell 804, the emitting body 801 is clamped in the positioning shell 803, the positioning shell 803 is positioned and connected to the connecting claw 703, the rotating inner shell 804 is rotatably embedded and connected to the inside of the positioning shell 803, the positioning shell 803 and the rotating inner shell 804 cooperate with each other and cover the top of the emitting body 801, and the opening direction of the positioning shell 803 and the rotating inner shell 804 after the cooperation is sideways and downwards. During adjustment, the rotating inner shell 804 rotates along the positioning shell 803, the larger the overlapping area of ​​the two, the smaller the opening, and the smaller the overlapping area, the larger the opening, thereby adjusting the specific coverage range of the light. This embodiment cooperates with the transfer rod assembly 7 to further improve the adjustability of the ultraviolet emitter.

[0047] Specifically, the cross-section of the positioning outer shell 803 is set to be Ω-shaped, and a light baffle is provided at the opening to prevent light from radiating upward, and a light baffle is provided at the exposed end of the rotating inner shell 804; in addition, the emitting body 801 and the double-layer shell are both set to be C-shaped, and the overall combination is ring-shaped, so that the illuminated surface is ring-shaped and converges toward the center; this structure ensures that the periphery of the molding cylinder can obtain sufficient and uniform ultraviolet light during printing, so that the lighting effect in all directions is consistent, the molding positioning is accelerated, and the molding effect of the product is guaranteed.

[0048] Specifically, the emitting body 801 can be made into a ring or arc shape with reference to a mature ultraviolet lamp; and it can be connected to a power source through wires when in use.

[0049] The use process of the utility model is as follows:

[0050] 1) Preparation: First, the ceramic slurry 100 and the reinforcing fiber 200 are selected. The ceramic slurry 100 is prepared according to the printing product and a photosensitive material is added. The appropriate continuous reinforcing fiber 200 is selected and the surface wettability is treated.

[0051] Second, the setting of the printing path: according to the requirements of the printing product, the printing path program is preset and copied to the printer;

[0052] 2) Material filling and equipment connection:

[0053] The reinforcing fiber 200 is passed through the coaxial fiber positioning tube 2, and a predetermined weight of ceramic slurry 100 is filled into the cavity between the slurry nozzle 1 and the extrusion screw 2 through the feeding tube 3; then, the ultraviolet emitter 8 is electrically connected to the ultraviolet light source, and the light-emitting surface of the ultraviolet emitter 8 is adjusted to face the molding workbench 9; at the same time, the motor 5 drives the extrusion screw 2 to rotate to provide printing power;

[0054] 3) Printing job:

[0055] The printer is started, the motor 5 is started and drives the extrusion screw 2 to rotate. Under the action of the rotating extrusion force, the ceramic slurry 100 is extruded from the slurry nozzle 1, and the reinforcing fiber 200 is output synchronously at the same time. After the composite material of the two is cured, it is attached to the molding workbench 9. During the printing process, the ultraviolet emitter 8 is used for illumination to accelerate the curing operation.

[0056] After one layer of composite material is printed, the next layer is printed at a designated position while the printer is moving, and the above steps are repeated until printing is completed.

[0057] The annular lighting component of the utility model ensures the lighting effect and improves the curing speed; the design of the extrusion screw ensures the continuity of printing and improves the stability of the printed product. The combination of fiber and ceramic slurry effectively improves the mechanical properties of the printed product.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0059] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A screw-type 3D printing molding head, characterized in that: The invention comprises a slurry nozzle (1) and an extrusion screw (2), wherein the extrusion screw (2) is rotatably connected in the slurry nozzle (1) and is coaxially arranged, a fiber through hole is provided at the center of the extrusion screw (2), a feed pipe (3) is provided on the upper side wall of the slurry nozzle (1), a motor (5) is provided on one side of the slurry nozzle (1), and the rotating shaft of the motor (5) is connected to the extrusion screw (2) through a transmission component (4); a ceramic slurry (100) is filled in the cavity between the slurry nozzle (1) and the extrusion screw (2) through the feed pipe (3), and reinforcing fibers (200) are arranged in the fiber through hole of the extrusion screw (2); an annular lighting component is connected to the outer peripheral wall of the slurry nozzle (1), the lighting component is electrically connected to an ultraviolet light source, and the light-emitting surface of the lighting component faces a molding workbench (9).

2. The screw-type 3D printing molding head according to claim 1, characterized in that: A trumpet-shaped guide tube is provided at the top end of the extrusion screw (2); the fixed end of the reinforcing fiber (200) is wound around an external fiber shaft (202); and the free end of the reinforcing fiber (200) passes through the guide positioning wheel (201), the guide tube, and the fiber through hole of the extrusion screw (2) in sequence to the bottom of the slurry nozzle (1); A guide tube (101) for printing and molding materials is arranged at the bottom of the slurry nozzle (1).

3. The screw-type 3D printing molding head according to claim 2, characterized in that: The guide positioning wheel (201) comprises a fixed wheel and an adjustable wheel arranged at the same height, the fixed hole of the adjustable wheel is configured as a waist-shaped hole, and the positioning shaft of the adjustable wheel moves linearly along the waist-shaped hole when the position is adjusted.

4. The screw-type 3D printing molding head according to claim 1, characterized in that: The transmission assembly (4) comprises a driving gear (401) and a driven gear (402) that mesh with each other, the top end of the extrusion screw (2) passes through the top cover of the slurry nozzle (1) and is connected to the driven gear (402), and the driving gear (401) is connected to the rotating shaft of the motor (5).

5. The screw-type 3D printing molding head according to claim 4, characterized in that: A bearing (2-1) is installed between the top end of the extrusion screw (2) and the top cover of the slurry nozzle (1).

6. The screw-type 3D printing molding head according to claim 1, characterized in that: The illumination component adopts an ultraviolet emitter (8), and the ultraviolet emitter (8) is fastened to the bottom of the side wall of the slurry nozzle (1) through a transfer rod component (7) and a positioning component (6), and the ultraviolet emitter (8) is electrically connected to the ultraviolet light source.

7. The screw-type 3D printing molding head according to claim 6, characterized in that: The positioning assembly (6) comprises a first positioning ring (601) and a second positioning ring (602); one end of the first positioning ring (601) and the second positioning ring (602) are connected together in an openable and closable manner via a hinge shaft (603); one end of the first positioning ring (601) and the second positioning ring (602) are configured as locking ends (604) for positioning; and after the locking ends (604) are aligned, they are connected together via a bolt assembly, a pin or a magnetic block.

8. The screw-type 3D printing molding head according to claim 7, characterized in that: The transfer rod assembly (7) comprises an upper rod (701) and a lower rod (702), one end of the upper rod (701) is connected to the first positioning ring (601) and the second positioning ring (602), the other end of the upper rod (701) is hinged to the top end of the lower rod (702), and the bottom end of the lower rod (702) is positioned and connected to the ultraviolet emitter (8) via a connecting claw (703).

9. The screw-type 3D printing molding head according to claim 8, characterized in that: The ultraviolet emitter (8) comprises an emitting body (801) and a single-layer shell (802) for shading, wherein the single-layer shell (802) is connected to the connecting claw (703), the emitting body (801) is snapped into the single-layer shell (802), and the single-layer shell (802) covers the upper part of the emitting body (801) and has an opening direction to the lower side.

10. The screw-type 3D printing molding head according to claim 8, characterized in that: The ultraviolet emitter (8) comprises an emitting body (801) and a double-layer shell for shading, the double-layer shell comprising a positioning outer shell (803) and a rotating inner shell (804), the emitting body (801) is snap-fitted into the positioning outer shell (803), the positioning outer shell (803) is positioned and connected to the connecting claw (703), the rotating inner shell (804) is rotatably embedded and connected to the inside of the positioning outer shell (803), the positioning outer shell (803) and the rotating inner shell (804) cooperate with each other and cover the top of the emitting body (801), and the opening direction of the positioning outer shell (803) and the rotating inner shell (804) after the cooperation is sideways and downwards.

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