Multi-material concrete 3D printing device

Abstract

The present invention discloses a multi-material concrete 3D printing device, comprising a three-axis linkage mechanism and a mixing print head provided on the three-axis linkage mechanism and having at least two feed ports and a discharge port, wherein the three-axis linkage mechanism can drive the mixing print head to realize movement in the X direction, the Y direction and the Z direction; the mixing print head comprises a mixing cylinder connected to the feed port, an extrusion screw extending into the mixing cylinder and a driving motor for driving the extrusion screw to rotate. The present invention can adopt multilateral feeding to stir and fuse multiple mixing materials, facilitate the preparation of ultra-high strength concrete, and print out high-strength 3D products.

Description

Technical Field

[0001] The present invention relates to a printing device, and in particular to a multi-material concrete 3D printing device. Background Art

[0002] Nowadays, 3D printing technology and equipment are becoming more and more advanced in the market, and all walks of life are using new 3D printing technology to complete product revolution and innovation. In the construction industry, there are also various types of cement printers used in the market, but they all have various defects; for example, the equipment is relatively bulky, expensive, and difficult to promote; in addition, the printing process is relatively simple, and can only realize the outline process of printing various architectural styles, which limits the printing materials. That is, the traditional concrete 3D printer adopts the method of contour printing, first prints the outline of the workpiece to be printed, and after the printing is completed using traditional concrete materials, the reinforcement process is started. After the concrete is solidified, it is poured and filled fully, and it cannot be formed in one time.

[0003] Therefore, it is urgent to solve the above problems. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a multi-material concrete 3D printing device that can mix multiple raw materials to print ultra-high strength concrete products.

[0005] Technical solution: To achieve the above objectives, the present invention discloses a multi-material concrete 3D printing device, comprising a three-axis linkage mechanism and a mixing print head provided on the three-axis linkage mechanism and having at least two feed ports and a discharge port, wherein the three-axis linkage mechanism can drive the mixing print head to move in the X direction, the Y direction and the Z direction; the mixing print head comprises a mixing barrel connected to the feed port, an extrusion screw extending into the mixing barrel and a drive motor for driving the extrusion screw to rotate.

[0006] Wherein, the three-axis linkage mechanism includes an X-axis assembly, a Y-axis assembly and a Z-axis assembly, the X-axis assembly includes two parallel and symmetrically arranged X-axis brackets, an X-axis power guide rail arranged on one side of the X-axis bracket, an X-axis power slider that can move back and forth along the X-axis power guide rail, an X-axis driven guide rail arranged on the other side of the X-axis bracket and an X-axis driven slider that can move back and forth along the X-axis driven guide rail, the Y-axis assembly includes a Y-axis bracket whose two ends are respectively fixed to the X-axis power slider and the X-axis driven slider, a Y-axis power guide rail arranged on the Y-axis bracket and a Y-axis power slider that can move back and forth along the Y-axis power guide rail, and the Z-axis assembly includes a Z-axis bracket fixed on the Y-axis power slider, a Z-axis power guide rail arranged on the Z-axis bracket and a Z-axis power slider that can move back and forth along the Z-axis power guide rail, and the Z-axis power slider is provided with a connecting plate for mounting a mixing print head.

[0007] Preferably, the extrusion screw is connected to the mixing barrel through a bearing assembly, which includes a bearing seat fixed to the mixing barrel, a bearing end cover adapted to the bearing seat, and a bearing located in the bearing seat, and the extrusion screw passes through the bearing end cover, the bearing and the bearing seat in sequence and extends into the mixing barrel.

[0008] Furthermore, the mixing cylinder is also provided with a high-pressure flushing port and an additive inlet.

[0009] Furthermore, a plurality of blades are spirally arranged on the extrusion screw, and the angle between the blades and the axial direction of the extrusion screw is 100° to 150°.

[0010] Preferably, a reducer is provided between the driving motor and the extrusion screw.

[0011] Furthermore, the X-axis power guide rail, the Y-axis power guide rail and the Z-axis power guide rail are all ball screw transmission components, and the ball screw transmission component includes a roller screw driven by a servo motor.

[0012] Furthermore, the feed port is connected to a feed mechanism, which includes a feed barrel with an air inlet and an extrusion port, a feed end cover matched with the feed barrel and a piston located in the feed barrel, and concrete raw materials are filled in the feed barrel between the piston and the extrusion port, and high-pressure gas is injected into the air inlet. The high-pressure gas pushes the piston to move and extrude the concrete raw materials from the extrusion port.

[0013] Preferably, the feed barrel is provided with a peep window for conveniently observing the extrusion of the concrete raw materials.

[0014] Furthermore, the feed inlets are symmetrically arranged on the mixing cylinder.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0016] (1) The printing device of the present invention utilizes an X-axis assembly, a Y-axis assembly, and a Z-axis assembly to realize three-axis linkage to drive the mixing print head to realize three-axis motion; utilizes a servo motor and a high-precision ball screw to drive the XYZ three axes to realize three-dimensional motion of the equipment, and prints out concrete products;

[0017] (2) The present invention can adopt multilateral feeding to mix and fuse various mixed materials, which is convenient for preparing ultra-high strength concrete and printing high-strength 3D products. That is, the present invention uses silicate cement commonly used in the market, plus various aggregates and fibers of different coarseness and fineness, such as quartz sand, basalt, steel fiber and other materials, and places the materials in the feeding mechanisms on both sides, pre-mixes them with water, and uses high-pressure gas to push the piston to squeeze the placed materials into the mixing print head; the extrusion screw and its blades that facilitate flow extrusion are driven by the driving motor and the reducer, and the mixing is first carried out in the mixing barrel, and finally the printing material is output by the extrusion screw; in addition, by changing the extrusion diameter of the discharge port, the printing device can be used for multiple purposes, and can realize the conversion of fine and rough multiple printing modes;

[0018] (3) In order to facilitate secondary cleaning of the concrete material remaining in the inner cavity of the printing device, the present invention uses a high-pressure water spray device through the upper high-pressure flushing port to clean the inner cavity by using the pressure generated by high-pressure water, and starts the drive motor to drive the screw to discharge the waste material. Repeat the flushing several times until there is no residue;

[0019] (4) The present invention allows multiple materials such as quartz sand, cement, curing agent and steel fiber to be simultaneously introduced into the printing device for prefabrication, stirring and mixing, and directly prints out the required workpiece without the need for reinforcement and concrete filling. The present invention can achieve one-time printing and fast printing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the three-axis linkage mechanism in the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the X-axis assembly and the Y-axis assembly in the present invention;

[0023] Figure 4 It is a structural schematic diagram of the X-axis assembly in the present invention;

[0024] Figure 5 It is a schematic diagram of the assembly of the mixing print head and the feeding mechanism in the present invention;

[0025] Figure 6 is a cross-sectional schematic diagram of a mixing print head in the present invention;

[0026] Figure 7 It is a structural schematic diagram of the feeding mechanism in the present invention;

[0027] Figure 8 It is a cross-sectional schematic diagram of the feeding mechanism in the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown, a multi-material concrete 3D printing device of the present invention includes a three-axis linkage mechanism, a mixing print head 2 and a feeding mechanism 26.

[0030] like Figure 2 As shown, the three-axis linkage mechanism of the present invention includes an X-axis assembly, a Y-axis assembly and a Z-axis assembly. The X-axis assembly is a bearing component of the printing device, the Y-axis assembly is a load-bearing component of the printing device, and the Z-axis assembly is a bearing component of the printing device.

[0031] like Figure 3 and Figure 4 As shown, the X-axis assembly includes an X-axis bracket 6, an X-axis power guide rail 7, an X-axis power slider 8, an X-axis driven guide rail 9 and an X-axis driven slider 10. The two X-axis brackets 6 are arranged in parallel and symmetrically. The X-axis power guide rail 7 is located on one side of the X-axis bracket 6, and the X-axis driven guide rail 9 is located on the other side of the X-axis bracket 6. The X-axis power slider 8 is arranged on the X-axis power guide rail 7 and can move back and forth along the X-axis power guide rail. The X-axis driven slider 10 is arranged on the X-axis driven guide rail 9 and can move back and forth along the X-axis driven guide rail. The Y-axis assembly includes a Y-axis bracket 11, a Y-axis power guide rail 12 and a Y-axis power slider 13. The two ends of the Y-axis bracket 11 are fixedly connected to the X-axis power slider 8 and the X-axis driven slider 10 respectively. The Y-axis power guide rail 12 is fixed on the Y-axis bracket 11. The Y-axis power slider 13 is arranged on the Y-axis power guide rail 12 and can move back and forth along the Y-axis power guide rail. As shown in the figure, the Z-axis assembly includes a Z-axis bracket 14, a Z-axis power rail 15, a Z-axis power slider 16 and a connecting plate 17. The Z-axis bracket 14 is fixedly connected to the Y-axis power slider 13, the Z-axis power rail 15 is fixed on the Z-axis bracket 14, the Z-axis power slider 16 is arranged on the Z-axis power rail 15, and can move back and forth along the Z-axis power rail; the connecting plate 17 is fixed on the Z-axis power slider 16, and moves with the Z-axis power slider 16.

[0032] The X-axis power guide rail 7, the Y-axis power guide rail 12 and the Z-axis power guide rail 15 can all use a ball screw transmission assembly, which includes a roller screw driven by a servo motor 25. The ball screw transmission assembly is a modular assembly, and its shell structure is made of high-strength aluminum plate, and a ball screw is used inside. The servo motor 25 is used to drive the ball screw in the high-strength aluminum plate to move, so as to realize the reciprocating motion of the X-axis, Y-axis and Z-axis of the equipment, and realize inching and continuous motion.

[0033] like Figure 5 and Figure 6As shown, the mixing print head 2 of the present invention is installed on the connecting plate 17 through the clamp assembly 37, and the three-axis linkage mechanism drives the mixing print head 2 to realize the three-axis linkage. The mixing print head 2 includes a mixing barrel 3, an extrusion screw 4, a driving motor 5, a bearing assembly and a reducer. The mixing barrel 3 is provided with at least two feed ports 1, a high-pressure flushing port 21, an additive inlet 22 and a discharge port 36, wherein the feed port 1 is symmetrically arranged on the mixing barrel 3. The extrusion screw 4 is connected to the mixing barrel 3 through the bearing assembly, and the extrusion screw 4 extends into the mixing barrel 3. The extrusion screw 4 is connected to the driving motor 5 through the reducer, and the reducer adopts a planetary gear with a high transmission ratio to reduce speed, and the reduction ratio is 10: 1. The driving motor is started, and the extrusion screw 4 is driven to rotate after being reduced by the reducer. The bearing assembly includes a bearing seat 18 fixed to the mixing barrel, a bearing end cover 19 matched with the bearing seat and a bearing 20 located in the bearing seat. The extrusion screw 4 passes through the bearing end cover 19, the bearing 20 and the bearing seat 18 in turn and extends into the mixing barrel 3. The extrusion screw 4 is spirally provided with a plurality of blades 23, and the blade 23 and the extrusion screw 4 have an axial angle of 100° to 150°, and the preferred angle is 120°. The discharge port 36 can be connected to a multi-specification caliber joint to achieve different precision requirements. The extrusion screw 4 adopts high wear resistance 38Crmov, a large helix angle design, a surface nitriding treatment, and a large outer diameter, so that its storage capacity is increased and it is easy to extrude. The high-pressure flushing port 21 can be connected to high-pressure water, and the cleaning liquid with pressure is sprayed into the inner cavity of the mixing barrel 3 through the high-pressure spray device to remove the residual printing material, quickly complete the internal cleaning, reduce personnel intervention, and be convenient and fast. Liquid additives in concrete enter from the additive inlet 22. Multiple materials can be input from more than two feed ports 1 at the same time. If necessary, high-pressure flushing port 21 can also be used to feed materials, so as to realize printing of multiple mixed materials.

[0034] like Figure 7 and Figure 8As shown, the feed port 1 of the present invention is connected with a feed mechanism 26, which includes an air inlet 27, an extrusion port 28, a feed barrel 29, a feed end cover 30, a piston 31 and a peep window 33. The feed barrel 29 and the feed end cover 30 are adapted to each other, the air inlet 27 and the extrusion port 28 are both provided on the feed barrel 29, the air inlet 27 is connected with a high-pressure air pipe 34, and the extrusion port 28 is connected to the feed port 1 on the mixing print head 2 through a bend joint 35. The piston 31 is located in the feed barrel 29, and the feed barrel 29 between the piston 31 and the extrusion port 28 is filled with concrete raw materials 32, and the concrete raw materials 32 can be wrapped in a silicone sleeve. High-pressure gas is injected into the air inlet 27 through the high-pressure gas pipe 34. The high-pressure gas pushes the piston 31 to move, and the concrete raw material 32 is squeezed out from the extrusion port 28 and then enters the mixing cylinder 3 of the mixing printing head 2 through the bend joint 35. During the feeding process, the extrusion of the concrete raw material can be observed through the peep window 33. The feeding mechanism 26 uses the piston principle, adopts a high-precision feeding cylinder and a piston, and uses high-pressure gas to push the piston forward, so that the concrete raw material placed in the feeding cylinder is driven into the mixing printing head 2 through the feeding port 1.

Claims

1. A multi-material concrete 3D printing device, characterized in that: The invention comprises a three-axis linkage mechanism and a mixing print head (2) provided on the three-axis linkage mechanism and having at least two feed ports (1) and a discharge port (36); the three-axis linkage mechanism can drive the mixing print head (2) to move in the X direction, the Y direction and the Z direction; the mixing print head (2) comprises a mixing barrel (3) connected to the feed port (1), an extrusion screw (4) extending into the mixing barrel (3) and a drive motor (5) for driving the extrusion screw to rotate; the three-axis linkage mechanism comprises an X-axis assembly, a Y-axis assembly and a Z-axis assembly; the X-axis assembly comprises two X-axis brackets (6) arranged in parallel and symmetrically, an X-axis power guide rail (7) arranged on one side of the X-axis bracket, an X-axis power slider (8) which can move back and forth along the X-axis power guide rail, and an X-axis power slider (8) arranged on the X-axis bracket. An X-axis driven guide rail (9) on the X-axis bracket (6) on the other side and an X-axis driven slider (10) that can move back and forth along the X-axis driven guide rail; a Y-axis component comprising a Y-axis bracket (11) whose two ends are respectively fixed to the X-axis power slider (8) and the X-axis driven slider (10); a Y-axis power guide rail (12) arranged on the Y-axis bracket (11) and a Y-axis power slider (13) that can move back and forth along the Y-axis power guide rail; a Z-axis component comprising a Z-axis bracket (14) fixed on the Y-axis power slider, a Z-axis power guide rail (15) arranged on the Z-axis bracket and a Z-axis power slider (16) that can move back and forth along the Z-axis power guide rail; the Z-axis power slider (16) is provided with a connecting plate (17) for mounting a mixing print head (2); the extrusion screw (4) is connected to the mixing barrel (3) through a bearing assembly, the bearing assembly comprising a bearing seat (18) fixed to the mixing barrel, a bearing end cover (19) matched with the bearing seat and a bearing (20) located in the bearing seat, the extrusion screw (4) sequentially passes through the bearing end cover (19), the bearing (20) and the bearing seat (18) and extends into the mixing barrel (3); the mixing barrel (3) is also provided with a high-pressure flushing port (21) and an additive inlet (22); a plurality of blades (23) are spirally arranged on the extrusion screw (4), and the axial angle between the blades (23) and the extrusion screw (4) is 100° to 150°; a reducer (24) is provided between the drive motor (5) and the extrusion screw (4); the X-axis power guide rail (7 ), the Y-axis power guide rail (12) and the Z-axis power guide rail (15) are all ball screw transmission components, and the ball screw transmission component includes a roller screw driven by a servo motor (25); the feed port (1) is connected to a feed mechanism (26), and the feed mechanism (26) includes a feed barrel (29) having an air inlet (27) and an extrusion port (28), a feed end cover (30) adapted to the feed barrel (29), and a piston (31) located in the feed barrel (29); concrete raw material (32) is filled in the feed barrel (29) between the piston (31) and the extrusion port (28), and high-pressure gas is injected into the air inlet (27), and the high-pressure gas pushes the piston (31) to move, so that the concrete raw material (32) is extruded from the extrusion port (28);The feed barrel (29) is provided with a peep window (33) for conveniently observing the extrusion of the concrete raw materials; the feed port (1) is symmetrically arranged on the mixing barrel (3); the high-pressure flushing port (21) is connected to high-pressure water, and a high-pressure spray device is used to spray a pressurized cleaning liquid into the inner cavity of the mixing barrel (3) to remove residual printing materials. If necessary, the high-pressure flushing port (21) can also be used to feed materials to achieve printing of multiple mixed materials.

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