Direct-writing 3D printing pneumatic pressurizing extrusion pipe

Abstract

The utility model provides a direct-writing 3D printing pneumatic pressurizing extrusion pipe. The direct-writing 3D printing pneumatic pressurizing extrusion pipe comprises a straight-pipe-shaped inner pipe, an outer pipe and a mounting plate, wherein the inner pipe is sleeved with the outer pipe, the outer pipe and the inner pipe are arranged in a spaced mode, and the mounting plate is connected to the upper end of the inner pipe and the upper end of the outer pipe. An air hole communicated with the inner pipe is formed in the mounting plate; a spacer ring is connected between the inner pipe and the outer pipe, and the spacer ring and the mounting plate are matched to define an air guide cavity between the inner pipe and the outer pipe; two pistons are arranged in the axial direction of the inner pipe in a spaced mode and connected in a spaced mode. A first through hole and a second through hole which are communicated with the air guide cavity are formed in the circumferential side wall of the inner pipe, the first through hole is formed above the piston located on the upper portion, and the second through hole is formed between the two pistons; and the bottom end of the inner tube is detachably connected with a printing head with a needle head. The slurry extrusion device has the effect of facilitating extrusion of high-viscosity slurry.

Description

TECHNICAL FIELD

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

[0002] Currently in the direct writing 3D printer of metal slurry, need to adopt the way of pneumatic or mechanical extrusion to extrude the metal slurry preloaded in extrusion pipe by the needle of extrusion pipe, extrusion pipe is installed on the walking mechanism of 3D printer, along with the movement of extrusion pipe following walking mechanism in three-dimensional space, extruded slurry is from line to plane, layer by layer to print three-dimensional structure metal embryo.

[0003] In the related art, the extrusion pipe includes a straight cylindrical pipe body with one end open and the other end gradually tapered and connected with a needle, and a plug body located in the pipe body to push the metal slurry to be extruded by the needle; when the plug body is moved along the axial direction of the pipe body by pneumatic, the extrusion force of the plug body is insufficient in the pressure range of the pipe body due to the large viscosity of the slurry, which causes the slurry to be difficult to extrude. SUMMARY

[0004] Therefore, the utility model aims at providing a direct writing 3D printing pneumatic pressurization extrusion pipe to facilitate the extrusion of high-viscosity slurry.

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

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

[0007] a straight pipe-shaped inner tube, an outer tube sleeved outside the inner tube and spaced apart from the inner tube, and a mounting plate connected to the upper ends of the inner tube and the outer tube; the mounting plate is provided with a gas hole communicating with the inner tube;

[0008] A partition ring is connected between the inner tube and the outer tube, and the partition ring cooperates with the mounting plate to form a gas guide cavity between the inner tube and the outer tube;

[0009] Two pistons are spaced apart along the axial direction of the inner tube, and the two pistons are spaced apart and connected;

[0010] The inner tube is provided with a first through hole and a second through hole communicating with the gas guide cavity on the circumferential side wall, the first through hole is arranged above the upper piston, and the second through hole is arranged between the two pistons;

[0011] The inner tube is detachably connected with a printing head having a needle at the bottom end.

[0012] Further, a connecting rod is fixedly connected between the two pistons.

[0013] Further, the upper end of the printing head is inserted between the inner tube and the outer tube, and the printing head is screwed with the inner tube.

[0014] Further, the mounting plate is provided with a three-way pipe, one end of the three-way pipe is connected with the mounting plate through the air hole, and the two ends of the three-way pipe are both connected with air valves.

[0015] Further, the inner wall of the inner tube is fixedly connected with a limiting ring, and the limiting ring is located between the first through hole and the second through hole.

[0016] Further, the two ends of the three-way pipe connected with the air valves are respectively connected with a vacuum pump and an air pressure source.

[0017] Further, the mounting plate is fixedly connected with the outer tube.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The direct writing 3D printing pneumatic supercharged extrusion pipe, when the slurry is extruded from the printing head during 3D printing, the external air pressure source is introduced into the inner tube through the air hole, the gas is introduced into the air guide cavity under the action of the first through hole, and the second through hole is used to introduce the chamber formed by the two pistons and the inner tube; under the action of the air pressure, the two pistons move downward, and the piston located at the lower part pushes the slurry to be extruded from the printing head. The air pressure extrudes the two pistons, and under the condition that the pressure of the air pressure source is unchanged, the extrusion force of the piston located at the lower part on the slurry is improved, the extrusion of the high-viscosity slurry is realized, and the effect of extruding the high-viscosity slurry is achieved. When the slurry in the inner tube is used up, the printing head is removed, the end of the inner tube is inserted into the slurry, the piston moves axially upward along the inner tube, and the filling of the slurry is realized, so that the extrusion pipe can be repeatedly used.

[0020] The connecting rod is arranged between the two pistons, the stable connection of the two connecting rods is realized, and the chamber formed by the two pistons and the inner tube has a chamber for containing air pressure.

[0021] The printing head is screwed with the inner tube, the printing head can be easily removed from the inner tube, and the slurry can be filled into the inner tube; when the viscous metal slurry is extruded from the needle into the pipe body, the connection between the printing head and the inner tube has good pressure resistance.

[0022] The three-way pipe is communicated with the air hole and provided with the air valve, then the two ends of the three-way pipe not connected with the mounting plate are communicated with the vacuum pump and the air pressure source respectively, and the filling of the slurry into the pipe body or the extrusion of the slurry is realized through the adjustment of the air valve.

[0023] By fixing the limiting ring in the inner tube, when the slurry is filled into the inner tube, the upper piston cannot move upward along the axial direction of the inner tube after abutting against the limiting ring, so that the upper piston is located below the first through hole and the lower piston is located below the second through hole.

[0024] By connecting the vacuum pump and the air pressure source on both ends of the air valve, when the slurry needs to be filled into the inner tube, the air valve connected with the air pressure source is opened, the air valve connected with the vacuum pump is opened, and the vacuum pump is started to vacuum the inner tube, at this time, the slurry is filled into the inner tube from the end of the inner tube. When the metal slurry is extruded from the inner tube for printing, the air valve connected with the vacuum pump is closed, and the air valve connected with the air pressure source is opened, and the gas is filled into the inner tube and the air guide cavity.

[0025] By fixing the mounting plate and the outer tube, the air guide cavity has good pressure bearing capacity, and the structural strength of the extrusion pipe is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application. The embodiments of the application and its

[0027] Fig. 1 It is a schematic diagram of the overall structure of the embodiment of the application;

[0028] Fig. 2 It is a sectional view of the embodiment of the application showing the internal structure of the inner tube.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1, the inner tube;

[0031] 101, the first through hole; 102, the second through hole; 103, the limiting ring;

[0032] 2, the outer tube;

[0033] 3, the mounting plate;

[0034] 301, the air hole;

[0035] 4, the spacer ring;

[0036] 5, the air guide cavity;

[0037] 6, the piston;

[0038] 7, the print head;

[0039] 701, the needle;

[0040] 8, the connecting rod;

[0041] 9, the tee pipe;

[0042] 901. Gas valve. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0044] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] 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.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] This embodiment relates to a direct-write 3D printing pneumatic pressurized extrusion tube to facilitate the extrusion of high-viscosity slurries.

[0048] In terms of overall structure, such as Figs. 1-2 As shown, the direct-write 3D printing pneumatic pressurized extrusion tube includes: an inner tube 1 in the shape of a straight tube, an outer tube 2 sleeved outside the inner tube 1 and spaced apart from the inner tube 1, and a mounting plate 3 connected to the upper ends of the inner tube 1 and the outer tube 2; the mounting plate 3 has an air hole 301 communicating with the inner tube 1; a spacer ring 4 is connected between the inner tube 1 and the outer tube 2, and the spacer ring 4 and the mounting plate 3 cooperate to form an air guide cavity 5 between the inner tube 1 and the outer tube 2; two pistons 6 are spaced apart along the axial direction of the inner tube 1, and the two pistons 6 are connected at intervals; a first through hole 101 and a second through hole 102 communicating with the air guide cavity 5 are opened on the circumferential side wall of the inner tube 1, the first through hole 101 is opened above the upper piston 6, and the second through hole 102 is opened between the two pistons 6; a print head 7 with a needle 701 is detachably connected to the bottom end of the inner tube 1.

[0049] When 3D printing requires the slurry to be extruded from the print head 7, an external air pressure source is introduced into the inner tube 1 through the air hole 301. Under the action of the first through hole 101, gas is introduced into the air guide chamber 5 and then into the chamber formed by the two pistons 6 and the inner tube 1 through the second through hole 102. Under the push of the air pressure, both pistons 6 move downwards, and the lower piston 6 pushes the slurry out of the print head 7. The air pressure simultaneously compresses the two pistons 6, increasing the compressive force of the lower piston 6 on the slurry while the air pressure source pressure remains constant, thus achieving the extrusion of high-viscosity slurry and facilitating its extrusion. When the slurry in the inner tube 1 is completely used up, the print head 7 is removed, and the end of the inner tube 1 is inserted into the slurry. The piston 6 moves upwards along the axial direction of the inner tube 1 to fill the slurry, facilitating the reuse of the extrusion tube.

[0050] Based on the above overall introduction, such as Figs. 1-2 As shown, in this embodiment, a connecting rod 8 is fixedly connected between the two pistons 6. By setting the connecting rod 8 between the two pistons 6, a stable connection between the two connecting rods 8 is achieved, and the cavity formed by the two pistons 6 and the inner tube 1 has a cavity that can accommodate air pressure.

[0051] In one embodiment where the printhead 7 is detachably connected to the inner tube 1, the upper end of the printhead 7 is inserted between the inner tube 1 and the outer tube 2, and the printhead 7 is threadedly connected to the inner tube 1. This threaded connection facilitates the removal of the printhead 7 from the inner tube 1 for filling the inner tube 1 with slurry; simultaneously, the connection between the printhead 7 and the inner tube 1 exhibits good compressive strength when viscous metal slurry is extruded from the tube body through the needle 701.

[0052] To further facilitate connection to an external air source via the vent 301, the mounting plate 3 is equipped with a three-way pipe 9. One end of the three-way pipe 9 is connected to the mounting plate 3 via the vent 301, and both ends of the three-way pipe 9 are connected to air valves 901. The two ends of the three-way pipe 9 connected to the air valves 901 are respectively connected to a vacuum pump and an air pressure source. By connecting the three-way pipe 9 at the vent 301 and installing the air valves 901, it is convenient to connect the two ends of the three-way pipe 9 not connected to the mounting plate 3 to the vacuum pump and the air pressure source respectively. The slurry can be filled or extruded into the pipe by adjusting the air valves 901.

[0053] By connecting a vacuum pump and a pressure source to both ends of the gas valve 901, when it is necessary to fill the inner tube 1 with slurry, the gas valve 901 connected to the pressure source is opened, and the gas valve 901 connected to the vacuum pump is opened to start the vacuum pump and evacuate the inner tube 1. At this time, the slurry is filled into the inner tube 1 from the end. When printing to extrude the metal slurry from the inner tube 1, the gas valve 901 connected to the vacuum pump is closed, and the gas valve 901 connected to the pressure source is opened to fill the inner tube 1 and the gas guide cavity 5 with gas.

[0054] In order to ensure that the upper piston 6 is below the first through hole 101 and ensure that the lower piston 6 is below the second through hole 102, avoiding the risk of the slurry entering the gas guide cavity 5 from the second through hole 102; the inner tube 1 is fixedly connected with a limiting ring 103 between the first through hole 101 and the second through hole 102. By fixing the limiting ring 103 in the inner tube 1, when the slurry is filled into the inner tube 1, the upper piston 6 cannot move upward along the axial direction of the inner tube 1 after abutting against the limiting ring 103, so that the upper piston 6 is below the first through hole 101 and the lower piston 6 is below the second through hole 102.

[0055] In order to improve the pressure bearing capacity of the extrusion pipe, the mounting plate 3 is fixedly connected with the outer tube 2. By fixing the mounting plate 3 with the outer tube 2, the gas guide cavity 5 has good pressure bearing capacity, and the structural strength of the extrusion pipe is improved.

[0056] The direct writing 3D printing pneumatic pressurization extrusion pipe described in the application, when the slurry needs to be extruded from the print head 7 during 3D printing, the external air pressure source is introduced into the inner tube 1 through the air hole 301, the gas is introduced into the gas guide cavity 5 under the action of the first through hole 101, and the gas is introduced into the chamber formed by the two pistons 6 and the inner tube 1 through the second through hole 102; under the action of the gas pressure, the two pistons 6 move downward, and the lower piston 6 pushes the slurry to be extruded from the print head 7. The gas pressure simultaneously extrudes the two pistons 6, and under the condition that the pressure of the air pressure source is unchanged, the extrusion force of the lower piston 6 on the slurry is improved, the extrusion of high-viscosity slurry is realized, and the effect of easily extruding high-viscosity slurry is achieved. When the slurry in the inner tube 1 is used up, the print head 7 is removed, the end of the inner tube 1 is inserted into the slurry, and the piston 6 moves upward along the axial direction of the inner tube 1, so that the slurry is filled, and the extrusion pipe is reused.

[0057] The above only describes the 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 principles of the present application shall be included in the protection scope of the present application.

Claims

1. A direct write 3D printing pneumatic pressurized extrusion tube, characterized in that, The utility model relates to a kind of straight 3D printing pneumatic supercharged extrusion pipes, including: Including: the inner tube (1) of straight pipe, the outer tube (2) of being set outside the inner tube (1) and being spaced apart with the inner tube (1), and the mounting plate (3) connected to the upper end of the inner tube (1) and the outer tube (2);The mounting plate (3) is provided with air hole (301) with the inner tube (1) communication; The inner tube (1) is connected with the spacer ring (4) between the outer tube (2), and the spacer ring (4) is matched with the mounting plate (3), and the air guide cavity (5) is enclosed between the inner tube (1) and the outer tube (2); Two pistons (6) are spaced apart along the inner tube (1) axial direction and are connected, and two pistons (6) are spaced apart and arranged; The inner tube (1) circumferential side wall is provided with first through-hole (101) and second through-hole (102) with the air guide cavity (5) communication, and the first through-hole (101) is arranged above the upper piston (6), and the second through-hole (102) is between two pistons (6); The inner tube (1) bottom end is detachably connected with the print head (7) with needle (701).

2. The straight 3D printing pneumatic supercharged extrusion pipe according to claim 1, wherein: A connecting rod (8) is fixedly connected between the two pistons (6).

3. The straight 3D printing pneumatic supercharged extrusion pipe according to claim 1, wherein: The upper end of the print head (7) is inserted into the inner tube (1) and the outer tube (2), and the print head (7) is threadedly connected with the inner tube (1).

4. The straight 3D printing pneumatic supercharged extrusion pipe according to claim 1, wherein: The mounting plate (3) is provided with a three-way pipe (9), one end of the three-way pipe (9) is connected with the mounting plate (3) through the air hole (301), and both ends of the three-way pipe (9) are connected with air valves (901).

5. The straight 3D printing pneumatic supercharged extrusion pipe according to claim 1, wherein: A limiting ring (103) is fixedly connected to the inner wall of the inner tube (1), and the limiting ring (103) is located between the first through-hole (101) and the second through-hole (102).

6. The straight 3D printing pneumatic supercharged extrusion pipe according to claim 4, wherein: Both ends of the three-way pipe (9) connected with the air valves (901) are respectively connected with a vacuum pump and a gas pressure source.

7. The straight 3D printing pneumatic supercharged extrusion pipe according to claim 1, wherein: The mounting plate (3) is fixedly connected with the outer tube (2).

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