Leakage-proof spray head of spiral feeding 3D printer

Abstract

The invention 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 nozzle main body, a spray nozzle tail end and the like. The 3D printer nozzle effectively solves the problem that a spiral extrusion type 3D printer nozzle cannot instantly stop extrusion 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] The invention relates to the technical field of 3D printing, and in particular to a leakage-proof nozzle of a spiral-feeding 3D printer. Background Art

[0002] The current extrusion molding 3D printers are mainly divided into gear extrusion type, piston extrusion type and spiral extrusion type according to the extrusion method. Gear extrusion type 3D printers are mainly used for printing wire raw materials for finished product packaging, such as PLA, PETG and other wires; piston extrusion type 3D printers are mainly used for printing small semi-solid materials, such as viscous consumables such as gel, butter, food, etc., and spiral extrusion type 3D printers are mainly used for printing non-standard packaging raw materials, such as semi-fluid consumables such as clay, granular plastic, and building slurry. For spiral extrusion type 3D printers, there is an inherent drawback and defect that only closed-loop features can be printed continuously and cannot be interrupted. The reason is that the nozzle of the spiral extrusion type 3D printer cannot stop extrusion instantly when printing stops. Therefore, when printing is interrupted, the nozzle will continue to leak material, resulting in excess extrusion of non-closed-loop features, and the nozzle will move to another feature and there will be a shortage of material.

[0003] Due to the above defects, the application scope of spiral extrusion 3D printers is greatly reduced, and can only be limited to the use scenarios of simple closed-loop features, such as cavities, vases and other artworks.

[0004] As mentioned above, the principle defects of the current spiral extrusion 3D printers have resulted in fewer usage scenarios for printed parts and little practical value. Summary of the invention

[0005] The present invention provides a spiral feed 3D printer anti-leakage nozzle, and the purpose of the present invention is to provide a shut-off device that can enable the spiral feed 3D printer to instantly stop the extrusion of consumables when the extrusion needs to be interrupted during the printing process. To achieve the above purpose, the technical solution of the present invention is as follows.

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

[0007] Nozzle mounting bracket, used to carry the parts of the leak-proof nozzle;

[0008] The feed barrel 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] A feed screw is installed inside the feed barrel and connected to the power assembly, and the raw material is squeezed downward by the rotation of the feed screw;

[0010] A motor mounting bracket, which is mounted on the nozzle mounting bracket, and the motor mounting bracket is used to mount a power component and a feed barrel;

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

[0012] The electromagnet is installed on the electromagnet bracket by screws. It is used to generate magnetic force when the printing needs to stop extrusion, lift the piston, and then drive the piston ball head to close the nozzle outlet, so that the discharge is stopped instantly and the nozzle no longer leaks uncontrolled material;

[0013] The nozzle body is installed at the output end of the feed barrel, the electromagnet is slidably arranged 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 the present invention, the power assembly includes a motor and a coupling, and both ends of the coupling are respectively connected to the motor and the feed screw, and the rotation of the motor is transmitted to the feed screw through the coupling.

[0015] As a further technical solution of the present invention, it also includes a silo, and the output port of the silo is connected to the feed barrel.

[0016] As a further technical solution of the present invention, it also includes:

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

[0018] A sealing gasket is arranged between the feed barrel and the nozzle body. The sealing gasket is made of red copper with a Brinell hardness between 2000A and 3000A. The sealing gasket uses its good ductility to seal the gap between the feed barrel and the nozzle body.

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

[0020] Beneficial effects achieved by the present invention:

[0021] The present invention introduces a spiral feeding 3D printer anti-leakage nozzle, which effectively solves the problem that the spiral extrusion 3D printer nozzle cannot stop extrusion instantly when printing stops. Through the use of this nozzle, the application scope of the spiral extrusion 3D printer is expanded. Since the spiral extrusion 3D printer is mainly used in large nozzles and large flow 3D printing scenes, this nozzle can increase the printing speed in a larger range, lower the printing threshold, and enable the spiral extrusion 3D printer to print more complex structures instead of being limited to a single closed-loop structure. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0024] Figure 3 A cross-sectional view of a leak-proof nozzle for a spiral-fed 3D printer.

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

[0026] Figure 5 The nozzle of a spiral-feed 3D printer anti-leakage nozzle stops extruding (the piston is in the upper position).

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

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

[0029] Notes on figure numbers: 1-nozzle mounting bracket, 2-feed barrel, 3-feed screw, 4-motor mounting bracket, 5-motor, 6-coupling, 7-bin, 8-heating ring, 9-sealing gasket, 10-electromagnet bracket, 11-electromagnet, 12-nozzle body, 13-nozzle end, 14-piston ball head, 15-piston, 16-thermal insulation sleeve, 17-printing workpiece, 18-printing substrate. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is described in detail below in conjunction with the specific drawings.

[0031] See also Figures 1 to 7 , an embodiment of the present invention provides a spiral feeding 3D printer anti-leakage nozzle, comprising;

[0032] Nozzle mounting bracket 1, used for carrying components of the anti-leakage nozzle;

[0033] The feed barrel 2 is mounted on the motor mounting bracket 4 and is used to mount the feed screw 3 and the nozzle body 12 and limit the movement range of the raw material;

[0034] A feed screw 3 is installed inside the feed barrel 2 and connected to a power assembly, and the raw material is squeezed downward by the rotation of the feed screw 3;

[0035] A motor mounting bracket 4, which is mounted on the nozzle mounting bracket 1, and the motor mounting bracket 4 is used to mount a power component and a feed barrel 2;

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

[0037] A silo 7, the output port of which is in communication with the feed barrel 2, and which serves as a raw material storage silo for storing semi-fluid or granular consumables such as clay, granular plastic, and building slurry;

[0038] A heating ring 8 is sleeved on the outside of the feed tube 2 and is used to heat the printing raw materials, such as plastic particles, to heat the plastic particles to a molten state so as to be extruded from the nozzle;

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

[0040] The electromagnet bracket 10 is mounted on the nozzle mounting bracket 1 and is used to connect and fix the electromagnet 11;

[0041] The electromagnet 11 is installed on the electromagnet bracket 10 by screws, and is used to generate magnetic force when the printing needs to stop extrusion, lift the piston 15, and then drive the piston ball head 14 to close the nozzle discharge port, so that the discharge is stopped instantly, and the nozzle no longer produces uncontrolled leakage;

[0042] The nozzle body 12 is mounted at the output end of the feed barrel 2, the electromagnet 11 is slidably arranged inside the nozzle body 12, the piston ball head 14 is installed in the spherical cavity between the nozzle body 12 and the nozzle end 13, and the nozzle body 12 and the nozzle end 13 are interference fitted;

[0043] The heat insulating sleeve 16 is sleeved on the nozzle body 12 to isolate the high temperature on the nozzle body 12 so that the electromagnet 11 is in a good working condition.

[0044] The specific workflow is as follows:

[0045] The first step is to turn on the 3D printer. At this time, the electromagnet 11 is powered on, that is, the piston ball head 14 is in the upper position. Figure 5As shown. At this time, if the printing material is a room temperature slurry, the nozzle will be in a naturally closed state, and the nozzle end 13 is in a gravity negative pressure, and there will be no leakage. If the printing material is plastic particles, at this time, since the plastic is in a solid state, the piston 15 and the piston ball head 14 are not necessarily in the uppermost position, then the heating coil 8 needs to be energized to make the remaining consumables in the nozzle in a molten state. When the consumables in the nozzle reach a molten state, the piston 15 and the piston ball head 14 seal the upper opening of the spherical cavity of the nozzle body 12 under the gravitational force of the electromagnet 11, and the nozzle end 13 is in a state of no leakage.

[0046] In the second step, when the 3D printer starts working, the electromagnet 11 is powered off, and as the motor 5 drives the feed screw 3 to extrude, the consumable will flow downward, pushing the piston 15 to move to the lower state, the printer prints normally, the consumable is extruded normally, and a printed workpiece 17 is obtained, and the printed workpiece 17 is at the upper end of the printing substrate 18.

[0047] In the third step, when the 3D printing work completes the printing of an isolated island and needs to enter the next discontinuous feature, the electromagnet 11 is energized, and the piston 15 and the piston ball head 14 close the upper opening of the spherical cavity of the nozzle body 12 under the gravitational force of the electromagnet 11, and the nozzle end 13 is in a state of no leakage.

[0048] Step 4: When the nozzle reaches the next island feature and needs to continue printing, the electromagnet 11 is powered off, and as the feed motor 5 drives the feed screw 3 to extrude, the consumables will flow downward, pushing the piston 15 to move to the lower position, and the printer prints normally and the consumables are extruded normally. The above cycle continues until the printing is completed.

[0049] The above-mentioned spiral feed 3D printer anti-leakage nozzle effectively solves the problem that the spiral extrusion 3D printer nozzle cannot stop extrusion instantly when the printing action stops, so that the spiral extrusion 3D printer can print more complex structures instead of being limited to a single closed-loop structure, thus expanding its application range.

[0050] It should be noted that, in this article, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, 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, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, article or device including the element.

[0051] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A spiral feeding 3D printer anti-leakage nozzle, characterized in that: include; Nozzle mounting bracket, used to carry the parts of the leak-proof nozzle; The feed barrel 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; A feed screw is installed inside the feed barrel and connected to the power assembly, and the raw material is squeezed downward by the rotation of the feed screw; A motor mounting bracket, which is mounted on the nozzle mounting bracket, and the motor mounting bracket is used to install a power component and a feed barrel; An electromagnet bracket, which is mounted on the nozzle mounting bracket and is used to connect and fix the electromagnet; The electromagnet is installed on the electromagnet bracket by screws. It is used to generate magnetic force when the printing needs to stop extrusion, lift the piston, and then drive the piston ball head to close the nozzle outlet, so that the discharge is stopped instantly and the nozzle no longer leaks uncontrolled material; The nozzle body is installed at the output end of the feed barrel, the electromagnet is slidably arranged 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. A spiral feeding 3D printer anti-leakage nozzle according to claim 1, characterized in that: The power assembly includes a motor and a coupling, and both ends of the coupling are connected to the motor and the feed screw respectively, and the rotation of the motor is transmitted to the feed screw through the coupling.

3. A spiral feeding 3D printer leakage prevention nozzle according to claim 1, characterized in that: It also includes a silo, wherein an output port of the silo is connected to the feed cylinder.

4. A spiral feeding 3D printer leakage prevention nozzle according to claim 1, characterized in that: Also includes: A heating ring, which is sleeved on the outside of the feed cylinder and is used to heat the printing raw material; A sealing gasket is arranged between the feed barrel and the nozzle body. The sealing gasket is made of red copper with a Brinell hardness between 2000A and 3000A. The sealing gasket uses its good ductility to seal the gap between the feed barrel and the nozzle body.

5. The anti-leakage nozzle of a spiral feeding 3D printer according to claim 1, characterized in that: It also includes a heat-insulating sleeve, which is sleeved on the nozzle body and is used to isolate the high temperature on the nozzle body to keep the electromagnet in a good working state.

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