Direct-writing 3D printing pneumatic extrusion pipe

Abstract

The utility model provides a direct-writing 3D printing pneumatic extrusion pipe. The direct-writing 3D printing pneumatic extrusion pipe comprises a straight-pipe-shaped pipe body, a printing head and a piston, wherein the printing head is arranged at the tail end of the pipe body in a sleeving mode and connected with a needle head after being gradually shrunk, and the piston is plugged in the pipe body to push slurry in the pipe body to be extruded out of the needle head. The printing head is detachably connected to the tube body; the top end of the pipe body is connected with a mounting plate; air holes are formed in the mounting plate; an air bag is arranged in the tube body, one end of the air bag is fixedly connected with the mounting plate and communicated with the air hole, and the other end of the air bag is closed. The slurry extrusion device has the effect of stably extruding slurry.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of 3D printing equipment, especially a direct writing 3D printing pneumatic extrusion pipe. BACKGROUND

[0002] Currently, when using a direct writing 3D printer of metal paste, the metal paste preloaded in the extrusion pipe is extruded from the needle of the extrusion pipe, the extrusion pipe is installed on the walking mechanism of the 3D printer, and the extruded paste is from line to plane, layer by layer, and finally a three-dimensional structure of the metal embryo is printed.

[0003] In the related art, the extrusion pipe includes a straight cylindrical pipe body with one end being open and the other end being gradually tapered and connected with a needle, and a plug body located in the pipe body to push the metal paste to be extruded from the needle; when the plug body is pushed by the pneumatic mode to extrude the metal paste in the pipe body from the needle, the gas pressure is too large to seal the upper part of the plug body, which causes the gas to leak from the gap between the plug body and the pipe wall into the paste and be sprayed from the needle, resulting in the extruded paste being broken and not being formed. SUMMARY

[0004] Therefore, the utility model aims at providing a direct writing 3D printing pneumatic extrusion pipe to realize stable extrusion of paste.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A direct writing 3D printing pneumatic extrusion pipe, comprising:

[0007] a straight pipe-shaped pipe body, a printing head sleeved at the end of the pipe body and gradually tapered and connected with a needle, and a piston inserted in the pipe body to push the paste in the pipe body to be extruded from the needle;

[0008] The printing head is detachably connected to the pipe body;

[0009] The pipe body is connected with a mounting plate at the top end, and the mounting plate is provided with a gas hole;

[0010] The pipe body is provided with an air bag, one end of the air bag is fixedly connected with the mounting plate and communicates with the gas hole, and the other end of the air bag is closed.

[0011] Further, the gas hole is connected with a tee pipe, one end of the tee pipe is connected with the mounting plate, and the remaining two ends of the tee pipe are connected with air valves.

[0012] Further, the printing head is sleeved outside the pipe body and is threadedly connected with the pipe body.

[0013] Further, the air bag is selected from a corrugated tube.

[0014] Further, the pipe body top end is connected with a snap ring, the installation plate interior is formed with a cavity and the installation plate lower surface is provided with a through hole, the snap ring is inserted into the cavity from the through hole and is clamped in the installation plate after rotation.

[0015] Further, the snap ring cross section outer contour is oval.

[0016] Further, the tee pipe is connected with the air valve door, and the two end heads of the air valve door are connected with a vacuum pump and an air pressure source respectively.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The direct writing 3D printing pneumatic extrusion pipe, by setting up the air bag in the pipe body, and making the air bag one end and the air hole communicate, when filling the slurry in the pipe body, the printing head is taken down, and the piston is adjusted to be located at the end of the pipe body, the pipe body is inserted into the slurry, and the air bag is vacuumized through the air hole, so that the slurry filling is realized; when 3D printing is carried out, the air bag is inflated through the air hole, the air bag expands and pushes the piston to move to the side close to the needle head, so that the slurry is extruded from the needle head; in the whole process, the high-pressure airflow is located in the air bag, thereby avoiding the gas leakage between the piston and the pipe wall of the pipe body, and the slurry extrusion stability during printing is improved.

[0019] By communicating the tee pipe at the air hole and setting the air valve door, the two ends of the tee pipe not connected with the installation plate are communicated with the vacuum pump and the air pressure source respectively, and the slurry filling or extrusion in the pipe body is realized through the air valve door adjustment.

[0020] By setting the pipe body and the printing head in threaded connection, the printing head and the pipe body are convenient to disassemble and assemble, and have good connection strength, and when the viscous metal slurry is extruded from the pipe body by the needle head, the printing head and the pipe body connection part has good pressure resistance.

[0021] By setting the air bag from the corrugated tube, when the air bag is vacuumized, the corrugated tube keeps original shape in the radial direction and shrinks along the axial direction of the pipe body, thereby facilitating the piston sliding in the axial direction of the pipe body.

[0022] By setting the installation plate with the cavity and the through hole on the installation plate, the snap ring is inserted into the cavity from the through hole, and then the pipe body and the adapter are installed by rotating the snap ring, so that the use convenience of the extrusion pipe is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of this patent, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0024] Fig. 1 It is the whole structure schematic view of the embodiment of the present application;

[0025] Fig. 2 It is the sectional view of the embodiment of the present application for showing the clasp;

[0026] Fig. 3 It is the partial structure schematic view of the embodiment of the present application for showing the air bag.

[0027] Legend of reference signs:

[0028] 1, pipe body;

[0029] 101, needle; 102, print head; 103, piston;

[0030] 2, mounting plate;

[0031] 201, air hole; 202, cavity; 203, through hole;

[0032] 3, air bag;

[0033] 4, tee;

[0034] 401, air valve;

[0035] 5, clasp. DETAILED DESCRIPTION

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0037] In the description of the present application, it should be noted that if the terms indicating the orientation or position relationship such as 'upper', 'lower', 'inner', 'outer' appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the device or element to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms 'first','second' appear, they are also used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] This embodiment relates to a direct-write 3D printing pneumatic extrusion tube to achieve stable slurry extrusion.

[0041] In terms of overall structure, such as Figs. 1-3 As shown, the direct-write 3D printing pneumatic extrusion tube includes a tube body 1 in the shape of a straight tube, a print head 102 sleeved at the end of the tube body 1 and gradually narrowed and connected to a needle 101, and a piston 103 inserted inside the tube body 1 to push the slurry inside the tube body 1 to be extruded from the needle 101; the print head 102 is detachably connected to the tube body 1; a mounting plate 2 is connected to the top of the tube body 1; an air hole 201 is opened on the mounting plate 2; an air bladder 3 is provided inside the tube body 1, one end of the air bladder 3 is fixedly connected to the mounting plate 2 and communicates with the air hole 201, and the other end of the air bladder 3 is closed.

[0042] By setting an air bladder 3 inside the tube body 1 and connecting one end of the air bladder 3 to the air hole 201, when filling the tube body 1 with slurry, the print head 102 is removed, and the piston 103 is adjusted to be located at the end of the tube body 1. The tube body 1 is then inserted into the slurry, and the air bladder 3 is evacuated through the air hole 201 to achieve slurry filling. When 3D printing is performed, air is inflated into the air bladder 3 through the air hole 201. The expansion of the air bladder 3 pushes the piston 103 to move towards the side closer to the needle 101, thereby extruding the slurry from the needle 101. Throughout the process, the high-pressure airflow is located inside the air bladder 3, thus preventing gas from leaking out between the piston 103 and the tube wall of the tube body 1, thereby improving the stability of slurry extrusion during printing.

[0043] Based on the above overall introduction, in this embodiment, the print head 102 is sleeved outside the tube body 1 and threadedly connected to the tube body 1. By setting the tube body 1 and the print head 102 to be threadedly connected, the print head 102 and the tube body 1 are easy to disassemble and assemble, and the print head 102 and the tube body 1 have good connection strength. When the viscous metal paste is squeezed out of the tube body 1 by the needle 101, the connection between the print head 102 and the tube body 1 has good compressive strength.

[0044] Specifically, the closed end of the air bag 3 can be fixedly connected with the piston 103 or abut against the piston 103, preferably, the closed end of the air bag 3 is fixedly connected with the piston 103, and the fixed connection can be achieved by bonding. In this way, when the air bag 3 is contracted or inflated, the piston 103 can be smoothly moved along the axial direction of the pipe body 1.

[0045] In order to facilitate the connection of the air hole 201 with the gas source, as shown in Figs. 1-2 The air hole 201 is connected with a three-way pipe 4, one end of the three-way pipe 4 is connected with the mounting plate 2, and the remaining two ends of the three-way pipe 4 are connected with air valves 401. The two ends of the three-way pipe 4 connected with the air valves 401 are respectively connected with a vacuum pump and a gas pressure source.

[0046] By connecting the three-way pipe 4 with the air hole 201 and arranging the air valves 401, the two ends of the three-way pipe 4 not connected with the mounting plate 2 are respectively connected with the vacuum pump and the gas pressure source, and the air valves 401 are adjusted to realize the filling of the slurry into the pipe body 1 or the extrusion of the slurry.

[0047] As an implementable mode, the air bag 3 is a bellows. When the air bag 3 is vacuumized, the bellows remains unchanged in the radial direction and is contracted along the axial direction of the pipe body 1, thereby facilitating the sliding of the piston 103 along the axial direction of the pipe body 1.

[0048] In order to facilitate the disassembly and assembly of the mounting plate 2 and the pipe body 1, as shown in Figs. 1-2 The mounting plate 2 is internally formed with a cavity 202, and the lower surface of the mounting plate 2 is provided with a through hole 203. The snap ring 5 is inserted into the cavity 202 through the through hole 203 and is clamped in the mounting plate 2 after being rotated. The cross section of the snap ring 5 is oval. By arranging the mounting plate 2 with the cavity 202 and the through hole 203, the snap ring 5 is inserted into the cavity 202 through the through hole 203, and then the pipe body 1 and the adapter are assembled by rotating the snap ring 5, thereby improving the convenience of use of the extrusion pipe.

[0049] The direct writing 3D printing pneumatic extrusion pipe described in the present application is filled with slurry in the pipe body 1 before printing. The printing head 102 is removed, the piston 103 is adjusted to be located at the end of the pipe body 1, the pipe body 1 is inserted into the slurry, and the air bag 3 is vacuumized through the air hole 201 to realize the filling of the slurry. When 3D printing is performed, the air bag 3 is inflated through the air hole 201, the air bag 3 is expanded to push the piston 103 to move to the side close to the needle head 101, and the slurry is extruded from the needle head 101. In the whole process, the high-pressure gas flow is located in the air bag 3, thereby avoiding the leakage of the gas from the gap between the piston 103 and the pipe wall of the pipe body 1, and improving the stability of the slurry extrusion during printing.

[0050] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A direct-write 3D printing pneumatic extrusion tube, characterized in that, Including: The tube body (1) is in a straight pipe shape, the print head (102) is sleeved on the end of the tube body (1) and is gradually contracted and connected with the needle (101), and the piston (103) is inserted into the tube body (1) to push the slurry in the tube body (1) to be extruded by the needle (101); The print head (102) is detachably connected on the tube body (1); The mounting plate (2) is connected on the top end of the tube body (1); the air hole (201) is formed on the mounting plate (2); The air bag (3) is arranged in the tube body (1), one end of the air bag (3) is fixedly connected with the mounting plate (2) and communicates with the air hole (201), and the other end of the air bag (3) is closed.

2. The direct writing 3D printing pneumatic extrusion tube according to claim 1, wherein: The air hole (201) is connected with the tee pipe (4), one end of the tee pipe (4) is connected with the mounting plate (2); the remaining two ends of the tee pipe (4) are connected with the air valve (401).

3. The direct writing 3D printing pneumatic extrusion tube according to claim 1, wherein: The print head (102) is sleeved outside the tube body (1) and is threadedly connected with the tube body (1).

4. The direct writing 3D printing pneumatic extrusion tube according to claim 1, wherein: The air bag (3) is selected from a corrugated pipe.

5. The direct writing 3D printing pneumatic extrusion tube according to claim 1, wherein: The mounting plate (2) is internally formed with the cavity (202) and the lower surface of the mounting plate (2) is formed with the through hole (203), the clamping ring (5) is inserted into the cavity (202) through the through hole (203) and is clamped in the mounting plate (2) after being rotated.

6. The direct writing 3D printing pneumatic extrusion tube according to claim 5, wherein: The cross section of the clamping ring (5) is in an oval shape.

7. The direct writing 3D printing pneumatic extrusion tube according to claim 2, wherein: The two ends of the tee pipe (4) connected with the air valve (401) are respectively connected with a vacuum pump and an air pressure source.

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