Leakage-proof spray head of spiral feeding 3D printer

Abstract

The utility model discloses a leakage-proof spray head of a spiral feeding 3D printer. The leakage-proof spray head comprises a spray head mounting bracket, a feeding barrel, a feeding screw rod, a motor mounting bracket, an electromagnet bracket, an electromagnet, a piston, a piston ball head, a spray head main body, a spray head tail end and the like. The utility model effectively solves the problem that the spray head of the spiral extrusion type 3D printer can not stop extruding instantly when printing is stopped. By using the spray head, the application range of the spiral extrusion type 3D printer is expanded, and the spiral extrusion type 3D printer is mainly applied to large-spray-head and large-flow 3D printing scenes, so that the spray head can improve the printing speed and reduce the printing threshold in a larger range, and the spiral extrusion type 3D printer can print more complex structures; and the method is not limited to a single closed-loop structure.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and in particular to a leak-proof nozzle for a spiral feed 3D printer. Background Technology

[0002] Currently, extrusion 3D printers are mainly classified into gear extrusion, piston extrusion, and spiral extrusion based on their extrusion methods. Gear extrusion 3D printers are primarily used for printing filament materials for finished product packaging, such as PLA and PETG filaments. Piston extrusion 3D printers are mainly used for printing small, semi-solid materials, such as gels, butter, and food-grade viscous materials. Spiral extrusion 3D printers are mainly used for printing non-standard packaging materials, such as clay, granular plastics, and building slurry. Spiral extrusion 3D printers have an inherent drawback: they can only continuously print closed-loop features and cannot be interrupted. This is because the nozzle of a spiral extrusion 3D printer cannot instantly stop extruding when printing stops. Therefore, when printing is interrupted, the nozzle continues to leak material, resulting in excess extrusion of non-closed-loop features. When the nozzle moves to another feature, a material shortage occurs.

[0003] Due to the aforementioned drawbacks, the application scope of spiral extrusion 3D printers is greatly reduced, limiting them to simple, closed-loop feature-rich scenarios, such as cavities, vases, and other works of art.

[0004] As mentioned above, the inherent flaws in the design of current spiral extrusion 3D printers result in limited application scenarios and minimal practical value for the printed parts. Utility Model Content

[0005] This utility model provides a leak-proof nozzle for a spiral feed 3D printer. The purpose of this utility model is to provide a shut-off device that can instantly stop filament extrusion when the extrusion process of a spiral feed 3D printer needs to be interrupted. To achieve the above objective, the technical solution of this utility model is as follows.

[0006] A leak-proof nozzle for a spiral feed 3D printer, comprising:

[0007] Nozzle mounting bracket, used to support components for leak-proof nozzles;

[0008] The feed cylinder is mounted on the motor mounting bracket and is used to mount the feed screw and the nozzle body, while limiting the movement range of the raw materials;

[0009] The feed screw is installed inside the feed barrel and connected to the power assembly. The raw material is extruded downward by rotating the feed screw.

[0010] A motor mounting bracket is mounted on the nozzle mounting bracket, and the motor mounting bracket is used to mount the power unit and the feed cylinder;

[0011] An electromagnet bracket, which is installed on the nozzle mounting bracket, is used to connect and fix the electromagnet.

[0012] An electromagnet, which is mounted on an electromagnet bracket with screws, is used to generate magnetic force when printing needs to stop extrusion. This lifts the piston, which in turn drives the piston ball head to close the nozzle outlet, thereby stopping the extrusion instantly and preventing uncontrolled leakage from the nozzle.

[0013] The nozzle body is installed at the output end of the feed cylinder, the electromagnet is slidably disposed inside it, the piston ball head is installed in the spherical cavity between the nozzle body and the nozzle end, and the nozzle body and the nozzle end are interference-fitted.

[0014] As a further technical solution of this utility model, the power component includes a motor and a coupling. The two ends of the coupling are respectively connected to the motor and the feed screw, and the rotational motion of the motor is transmitted to the feed screw through the coupling.

[0015] As a further technical solution of this utility model, it also includes a hopper, the output port of which is connected to the feed cylinder.

[0016] As a further technical solution of this utility model, it also includes:

[0017] A heating coil, which is sleeved on the outside of the feed cylinder, is used to heat the printing raw material;

[0018] A sealing gasket is disposed between the feed cylinder and the nozzle body. The sealing gasket is made of copper with a Brinell hardness between 35 and 45, which uses its good ductility to seal the gap between the feed cylinder and the nozzle body.

[0019] As a further technical solution of this utility model, it also includes a heat insulation sleeve, which is fitted on the nozzle body to isolate the high temperature on the nozzle body and keep the electromagnet in good working condition.

[0020] The beneficial effects achieved by this utility model are:

[0021] This invention introduces a leak-proof nozzle for spiral feed 3D printers, effectively solving the problem that spiral extrusion 3D printer nozzles cannot instantly stop extrusion when printing stops. The use of this nozzle expands the application range of spiral extrusion 3D printers. Since spiral extrusion 3D printers are mainly used in large-nozzle and high-flow 3D printing scenarios, this nozzle can increase printing speed and lower the printing threshold over a wider range, enabling spiral extrusion 3D printers to print more complex structures, rather than being limited to single closed-loop structures. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a leak-proof nozzle for a spiral feed 3D printer.

[0023] Figure 2 This is a left view of a leak-proof nozzle for a spiral feed 3D printer.

[0024] Figure 3 This is a cross-sectional view of a leak-proof nozzle for a spiral feed 3D printer.

[0025] Figure 4 This is the normal operating state of a nozzle for a spiral feed 3D printer's anti-leakage nozzle (piston in the lower position).

[0026] Figure 5 This refers to the nozzle stop extrusion state (piston in the upper position) of a spiral feed 3D printer's anti-leakage nozzle.

[0027] Figure 6 This is a diagram of an electromagnet support component in the anti-leakage nozzle of a spiral feed 3D printer.

[0028] Figure 7 This is a diagram of the piston and piston ball head parts in an anti-leakage nozzle of a spiral feed 3D printer.

[0029] Figure reference numerals: 1-Nozzle mounting bracket, 2-Feed cylinder, 3-Feed screw, 4-Motor mounting bracket, 5-Motor, 6-Coupling, 7-Hopper, 8-Heating coil, 9-Sealing gasket, 10-Electromagnet bracket, 11-Electromagnet, 12-Nozzle body, 13-Nozzle end, 14-Piston ball head, 15-Piston, 16-Heat insulation sleeve, 17-Printed workpiece, 18-Printed substrate. Detailed Implementation

[0030] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0031] Please see Figures 1 to 7 This utility model provides a leak-proof nozzle for a spiral feed 3D printer, comprising:

[0032] Nozzle mounting bracket 1, used to support the leak-proof nozzle;

[0033] The feed cylinder 2 is mounted on the motor mounting bracket 4 and is used to mount the feed screw 3 and the nozzle body 12, while limiting the movement range of the raw materials;

[0034] The feed screw 3 is installed inside the feed cylinder 2 and connected to the power assembly. The raw material is extruded downward by the rotation of the feed screw 3.

[0035] Motor mounting bracket 4 is mounted on the nozzle mounting bracket 1. The motor mounting bracket 4 is used to mount the power unit and the feed cylinder 2.

[0036] The power assembly includes a motor 5 and a coupling 6. The two ends of the coupling 6 are connected to the motor 5 and the feed screw 3 respectively, and the rotational motion of the motor 5 is transmitted to the feed screw 3 through the coupling 6.

[0037] The hopper 7 has an output port connected to the feed cylinder 2. It serves as a raw material storage hopper and can store semi-fluid or granular consumables such as clay, granular plastics, and building slurry.

[0038] Heating coil 8, which is sleeved on the outside of the feed cylinder 2, is used to heat the printing raw material, such as plastic granules, to heat the plastic granules to a molten state so that they can be extruded from the nozzle.

[0039] A sealing gasket 9 is disposed between the feed cylinder 2 and the nozzle body 12. The sealing gasket 9 is made of copper with a Brinell hardness between 35 and 45, and its good ductility is used to seal the gap between the feed cylinder 2 and the nozzle body 12.

[0040] Electromagnet bracket 10 is mounted on nozzle mounting bracket 1 and is used to connect and fix electromagnet 11.

[0041] Electromagnet 11, which is mounted on electromagnet bracket 10 by screws, is used to generate magnetic force when printing needs to stop extrusion, lift piston 15, and then drive piston ball head 14 to close the nozzle outlet, thereby stopping the discharge instantly and preventing uncontrolled leakage from the nozzle.

[0042] The nozzle body 12 is installed at the output end of the feed cylinder 2, the electromagnet 11 is slidably disposed inside it, and the piston ball head 14 is installed in the spherical cavity between the nozzle body 12 and the nozzle end 13. The nozzle body 12 and the nozzle end 13 are interference-fitted.

[0043] The heat insulation sleeve 16 is fitted onto the nozzle body 12 to isolate the high temperature on the nozzle body 12, so that the electromagnet 11 is in good working condition.

[0044] The specific workflow is as follows:

[0045] The first step is to power on the 3D printer. At this time, the electromagnet 11 is energized, meaning the piston ball head 14 is in the upper position. Figure 5 As shown. If the printing material is a room temperature paste, the nozzle will be in a naturally closed state, and the nozzle end 13 will be under negative pressure due to gravity, thus preventing material leakage. If the printing material is plastic granules, since the plastic is in a solid state, the piston 15 and piston ball head 14 may not be in the uppermost position. Therefore, the heating coil 8 needs to be energized to melt the remaining consumable material in the nozzle. When the consumable material in the nozzle reaches the molten state, the piston 15 and piston ball head 14, under the attraction of the electromagnet 11, seal the upper opening of the spherical cavity of the nozzle body 12, and the nozzle end 13 will be in a non-leaking state.

[0046] In the second step, when the 3D printer starts working, the electromagnet 11 is de-energized. As the motor 5 drives the feeding screw 3 to extrude, the consumable will flow downward, pushing the piston 15 to the lower position. The printer prints normally, and the consumable is extruded normally to obtain the printed workpiece 17, which is located on the upper end of the printing substrate 18.

[0047] Third, when the 3D printing work is completed and the printing of an isolated island needs to proceed to the next discontinuous feature, the electromagnet 11 is energized, and the piston 15 and piston ball head 14 are sealed at the upper opening of the spherical cavity of the nozzle body 12 under the attraction of the electromagnet 11, so that the nozzle end 13 is in a non-leaking state.

[0048] Fourth, when the printhead reaches the next isolated feature and printing needs to continue, the electromagnet 11 is de-energized. As the feeding motor 5 drives the feeding screw 3 to extrude, the consumable flows downward, pushing the piston 15 to the lower position. The printer prints normally, and the consumable is extruded normally. This cycle repeats until printing is finished.

[0049] The aforementioned anti-leakage nozzle for spiral feed 3D printers effectively solves the problem of spiral extrusion 3D printers failing to instantly stop extrusion when the printing process ceases. This allows spiral extrusion 3D printers to print more complex structures, rather than being limited to single closed-loop structures, thus expanding their application range.

[0050] It should be noted that, in this document, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0051] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A leak-proof nozzle for a spiral feed 3D printer, characterized in that, include; Nozzle mounting bracket, used to support components for leak-proof nozzles; The feed cylinder is mounted on the motor mounting bracket and is used to mount the feed screw and the nozzle body, while limiting the movement range of the raw materials; The feed screw is installed inside the feed barrel and connected to the power assembly. The raw material is extruded downward by rotating the feed screw. A motor mounting bracket is mounted on the nozzle mounting bracket, and the motor mounting bracket is used to mount the power unit and the feed cylinder; An electromagnet bracket, which is installed on the nozzle mounting bracket, is used to connect and fix the electromagnet. An electromagnet, which is mounted on an electromagnet bracket with screws, is used to generate magnetic force when printing needs to stop extrusion. This lifts the piston, which in turn drives the piston ball head to close the nozzle outlet, thereby stopping the extrusion instantly and preventing uncontrolled leakage from the nozzle. The nozzle body is installed at the output end of the feed cylinder, the electromagnet is slidably disposed inside it, the piston ball head is installed in the spherical cavity between the nozzle body and the nozzle end, and the nozzle body and the nozzle end are interference-fitted.

2. The anti-leakage nozzle for a spiral feed 3D printer according to claim 1, characterized in that, The power assembly includes a motor and a coupling. The two ends of the coupling are connected to the motor and the feed screw, respectively, and the rotational motion of the motor is transmitted to the feed screw through the coupling.

3. The anti-leakage nozzle for a spiral feed 3D printer according to claim 1, characterized in that, It also includes a hopper, the output port of which is connected to the feed cylinder.

4. The anti-leakage nozzle for a spiral feed 3D printer according to claim 1, characterized in that, Also includes: A heating coil, which is sleeved on the outside of the feed cylinder, is used to heat the printing raw material; A sealing gasket is disposed between the feed cylinder and the nozzle body. The sealing gasket is made of copper with a Brinell hardness between 35 and 45, and its ductility is used to seal the gap between the feed cylinder and the nozzle body.

5. The anti-leakage nozzle for a spiral feed 3D printer according to claim 1, characterized in that, It also includes a heat insulation sleeve, which is fitted onto the nozzle body to isolate the high temperature on the nozzle body.

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