Concrete 3D printing device

Abstract

The utility model relates to a concrete 3D printing device which comprises a stirring device, a pump pipe, a mechanical arm and a printing head, the stirring device is provided with a material conveying opening, the end portion of the mechanical arm is provided with a connecting portion, one end of the pump pipe is connected with the material conveying opening and fixed through the connecting portion, the other end of the pump pipe is connected to the printing head, and the printing head is provided with an ultrasonic transmitting device. Compared with the prior art, the device has the advantages that release of the microcapsule accelerator is triggered through ultrasound, balance of fluidity in the concrete pumping process and rapid setting after extrusion is achieved, meanwhile, influences on the properties of the concrete can be avoided, and higher printing efficiency and forming precision are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering, and in particular to a concrete 3D printing device. Background Art

[0002] 3D concrete printing, as an emerging construction method, significantly simplifies the complex processes of traditional concrete construction. Computer-controlled automated printing equipment allows concrete to be stacked layer by layer along a predetermined path. This not only improves construction efficiency but also expands architectural design possibilities, enabling the printing of complex curved surfaces and structures. While 3D concrete printing holds enormous theoretical potential, its practical application still faces a number of technical challenges, particularly the conflict between concrete's fluidity and rapid setting properties.

[0003] During the 3D printing process, concrete must maintain a certain fluidity to ensure smooth passage through pipes and the print head during pumping and extrusion. However, once the concrete is extruded from the print head, it must quickly solidify to ensure the printed structure is stable and can withstand its own weight and the accumulation of subsequent layers. This conflict between fluidity and solidification limits the practical application of 3D printing concrete technology in construction.

[0004] In the existing technology, a balance between fluidity and coagulation is achieved by heating the print head. However, the heating process affects the hydration process of the cement, increases the risk of shrinkage cracking, and causes a temperature gradient between the surface and interior of the concrete. At the same time, the capsules located inside the concrete may not melt.

[0005] Therefore, a 3D printing device that can achieve a more stable balance between fluidity and cohesion without affecting the properties of concrete is very important. Utility Model Content

[0006] The purpose of the present invention is to provide a concrete 3D printing device in order to overcome the defects of the above-mentioned prior art that affect the properties of concrete.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A concrete 3D printing device includes a stirring device, a pump pipe, a robotic arm and a print head. The stirring device is provided with a feed port, and the end of the robotic arm is provided with a connecting portion. One end of the pump pipe is connected to the feed port and passes through the connecting portion. The other end is connected to the print head. The print head is provided with an ultrasonic transmitter.

[0009] Furthermore, the ultrasonic emitting device is arranged at the inner center of the print head.

[0010] Furthermore, the ultrasonic emitting device is arranged around the print head.

[0011] Furthermore, the ultrasonic frequency of the ultrasonic emitting device is at least 20 kHz, and the power is at least 400 W.

[0012] Furthermore, the concrete used in the concrete 3D printing device is concrete mixed with ultrasound-triggered microcapsules, and the average diameter of the ultrasound-triggered microcapsules is less than 5 mm.

[0013] Furthermore, the robotic arm is used to adjust the moving path of the print head.

[0014] Furthermore, the stirring device includes a stirring barrel and a stirring head.

[0015] Furthermore, the pump tube is fixed by a support frame.

[0016] Furthermore, a scraper and a motor are provided inside the stirring device. The scraper is driven by the motor, and the side wall of the scraper contacts the inner wall of the stirring device.

[0017] Furthermore, there are multiple pump tubes, robotic arms, print heads and ultrasonic emitting devices, and the ultrasonic emitting devices of the multiple print heads are installed in different ways. Each print head is connected to a corresponding pump tube and is connected through a corresponding robotic arm.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The utility model provides an ultrasonic trigger device on the print head to evenly and fully crush the ultrasonic microcapsules, ensuring the uniform release of the accelerating agent in the entire concrete flow. This solves the problem of difficult control of fluidity and setting time in traditional 3D printing technology, avoids deformation or collapse of the printed structure, improves printing efficiency and molding accuracy, and avoids affecting the properties of the concrete.

[0020] 2) The present invention provides two different ways of setting up the ultrasonic generator, corresponding to the low flow and high precision requirements of fine printing and the high flow requirements of large-scale printing, respectively, providing technical solutions for the device in different printing application environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 This is a schematic diagram of the installation of the first ultrasonic emitting device provided by the utility model.

[0023] Figure 3 This is a schematic diagram of the installation of the second ultrasonic emitting device provided by the utility model.

[0024] Description of the marks in the figure: 1. stirring device, 2. pump tube, 3. robotic arm, 31. connecting part, 4. print head, 5. ultrasonic transmitting device. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0026] Example 1

[0027] like Figure 1 As shown, the utility model is a concrete 3D printing device, including a stirring device 1, a pump tube 2, a robotic arm 3 and a print head 4. The stirring device 1 is provided with a feeding port, and the end of the robotic arm 3 is provided with a connecting portion 31. One end of the pump tube 2 is connected to the feeding port and passes through the connecting portion 31. The other end is connected to the print head 4. The print head 4 is provided with an ultrasonic transmitting device 5.

[0028] Preferably, the stirring device 1 includes a stirring barrel and a stirring head, which can stir the ultrasonic microcapsules with concrete during use, thereby avoiding premature mixing of concrete that may cause concrete denaturation or long-term downtime waiting for concrete replenishment.

[0029] Preferably, the pump tube is fixed by a support frame.

[0030] Preferably, a scraper and a motor are provided inside the stirring device, the scraper is driven by the motor, and the side wall of the scraper is in contact with the inner wall of the stirring device.

[0031] like Figure 2 As shown, in this embodiment, the ultrasonic transmitter 5 is located in the center of the print head 4, enabling a more uniform effect on the concrete flow area, ensuring uniform release of the accelerator throughout the concrete flow. This design is suitable for scenarios requiring higher printing accuracy and smaller concrete flow rates, but it also requires a higher structural strength for the print head to withstand the impact of concrete.

[0032] The average diameter of the ultrasonic microcapsules in concrete is less than 5 mm. Once fully mixed with the concrete, these microcapsules are evenly distributed throughout the concrete, allowing for uniform release of the accelerator after ultrasonic disruption. The ultrasonic triggering device operates at a frequency of 20 kHz and a power of 400 W, sufficient to fully disrupt the microcapsules.

[0033] The workflow of this utility model is:

[0034] First, cement, fine aggregate, coarse aggregate, and ultrasonic microcapsules are added to the mixing device and thoroughly mixed using a mixing head to form a concrete mixture with good fluidity. The concrete is then pushed to the print head via a pump tube.

[0035] After the concrete is pumped to the print head, the ultrasonic transmitter is activated, ready to release the accelerating agent before the concrete is extruded. The ultrasonic device applies high-frequency vibrations to the concrete in the extrusion pipe through the centrally located ultrasonic transmitter.

[0036] As concrete flows through the printhead, ultrasonic cavitation shatters the ultrasonic microcapsules containing the accelerating agent, releasing the agent. The accelerating agent is quickly and evenly distributed throughout the concrete, ensuring that the concrete sets quickly after extrusion, enhancing the stability and strength of the printed structure.

[0037] Under the control of the robotic arm, the print head moves along the set path, stacking concrete layer by layer to complete the predetermined printing structure.

[0038] This embodiment is suitable for 3D printing tasks that require high-precision molding. The ultrasonic emission device can ensure the uniform release of the quick-setting agent and is suitable for use in concrete printing with a smaller flow rate.

[0039] Example 2

[0040] like Figure 3 As shown, this embodiment differs from Example 1 in that ultrasonic emitting devices 5 are positioned around the print head 4 to minimize the impact on the concrete flow path. This design is suitable for high-flow concrete extrusion processes, ensuring efficient triggering of the accelerator while minimizing obstruction to the concrete pumping flow.

[0041] Ultrasonic emitting devices apply ultrasonic waves to the concrete from all sides of the print head. The ultrasonic cavitation effect quickly triggers the rupture of microcapsules, evenly distributing the accelerator throughout the concrete and rapidly taking effect. Because the ultrasonic devices are distributed all around the concrete, they have minimal impact on the concrete flow path, making them suitable for high-volume printing.

[0042] Example 3

[0043] In this embodiment, two pump tubes, two robotic arms, and two print heads are included. The ultrasonic emitting device of one print head is installed in the manner of Example 1, and the ultrasonic emitting device of the other print head is installed in the manner of Example 2. Each print head is connected to the corresponding pump tube and is connected respectively through the corresponding robotic arm.

[0044] This device can be equipped with multiple different types of print heads at the same time, and the mixed concrete can be input into different print heads, which can meet multiple printing needs at the same time and is suitable for complex printing needs.

[0045] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A concrete 3D printing device, characterized in that: The invention comprises a stirring device (1), a pump tube (2), a mechanical arm (3) and a printing head (4); the stirring device (1) is provided with a material delivery port; the end of the mechanical arm (3) is provided with a connecting portion (31); one end of the pump tube (2) is connected to the material delivery port and fixed via the connecting portion (31); the other end is connected to the printing head (4); and the printing head (4) is provided with an ultrasonic emitting device (5).

2. A concrete 3D printing device according to claim 1, characterized in that: The ultrasonic emitting device (5) is arranged at the inner center of the print head (4).

3. A concrete 3D printing device according to claim 1, characterized in that: The ultrasonic emitting device (5) is arranged around the printing head (4).

4. The concrete 3D printing device according to claim 1, characterized in that: The ultrasonic frequency of the ultrasonic emitting device (5) is at least 20 kHz, and the power is at least 400 W.

5. The concrete 3D printing device according to claim 1, characterized in that: The concrete used in the concrete 3D printing device is concrete mixed with ultrasound-triggered microcapsules, and the average diameter of the ultrasound-triggered microcapsules is less than 5 mm.

6. The concrete 3D printing device according to claim 1, characterized in that: The mechanical arm (3) is used to adjust the moving path of the print head (4).

7. The concrete 3D printing device according to claim 1, characterized in that: The stirring device (1) comprises a stirring barrel and a stirring head.

8. The concrete 3D printing device according to claim 1, characterized in that: The pump tube (2) is fixed by a support frame.

9. The concrete 3D printing device according to claim 1, characterized in that: A scraper and a motor are provided inside the stirring device (1), the scraper is driven by the motor, and the side wall of the scraper contacts the inner wall of the stirring device (1).

10. The concrete 3D printing device according to claim 1, characterized in that: There are multiple pump tubes (2), mechanical arms (3), print heads (4) and ultrasonic emitting devices (5). The ultrasonic emitting devices (5) of the multiple print heads (4) are installed in different ways. Each print head (4) is connected to a corresponding pump tube (2) and is connected via a corresponding mechanical arm (3).

Images