Concrete 3D printing device

Abstract

The invention discloses a concrete 3D printing device and relates to the technical field of building construction, the concrete 3D printing device comprises a first trowelling baffle, a second trowelling baffle, a first fixing part, a second fixing part, a telescopic device, a printing head and a printing rack, the printing head is arranged on the printing rack and located below the printing rack, and the first trowelling baffle and the second trowelling baffle are oppositely arranged; the inner wall of the first trowelling baffle and the inner wall of the second trowelling baffle are used for trowelling concrete, the first fixing piece is arranged above the first trowelling baffle in a sliding mode, the second fixing piece is arranged above the second trowelling baffle in a sliding mode, and the printing head and the fixing pieces can be connected in a circumferential fixing and axial sliding mode. The printer frame is connected with the trowelling baffles through telescopic devices, the telescopic devices are arranged on the printer frame in a sliding and sleeving mode, and the first trowelling baffle and the second trowelling baffle can slide in the axial direction of the printing head. The application range is wide, and the good trowelling effect can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a concrete 3D printing device. Background Technology

[0002] Currently, in concrete 3D printing projects, the printing process involves 3D printing equipment extruding concrete layer by layer. Due to the fluidity of concrete, the printing of upper layers can compress lower layers, resulting in an uneven, striped texture and printing seams on the finished structure. Furthermore, because 3D printing concrete requires a certain consistency, insufficient fluidity prevents it from achieving self-compacting concrete, potentially leading to voids between layers, poor interlayer bonding, weak points, and overall structural instability. While some technologies utilize screeds for smoothing, these screeds are fixed in position to the print head, limiting adaptability and applicability to various conditions. Therefore, a concrete 3D printing device is urgently needed to address these technical problems. Summary of the Invention

[0003] The purpose of this invention is to provide a concrete 3D printing device to solve the problems existing in the prior art, which has a wide range of applications and can ensure a good smoothing effect.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a concrete 3D printing device, including a first smoothing baffle, a second smoothing baffle, a first fixing member, a second fixing member, a telescopic device, a print head, and a printer frame. The print head is disposed on the printer frame and located below the printer frame, and is movable relative to the printer frame. The first smoothing baffle and the second smoothing baffle are disposed opposite each other, and the inner walls of the first smoothing baffle and the second smoothing baffle are used for smoothing concrete. The first fixing member is slidably disposed above the first smoothing baffle, and the second fixing member is slidably disposed above the second smoothing baffle. The print head is circumferentially fixed and axially slidably connected to the first fixing member and the second fixing member. The printer frame is connected to both the first smoothing baffle and the second smoothing baffle through the telescopic device, and the telescopic device is slidably sleeved on the printer frame. Horizontal movement of the print head can drive the telescopic device to move. Both the first smoothing baffle and the second smoothing baffle are slidable along the axial direction of the print head.

[0005] In some embodiments, the first smoothing baffle includes a first horizontal plate and a first vertical plate vertically fixedly connected, and the second smoothing baffle includes a second horizontal plate and a second vertical plate vertically fixedly connected. The first horizontal plate and the second horizontal plate are both horizontally arranged and there is a gap between the first horizontal plate and the second horizontal plate. The gap is used to provide passage space for the concrete sprayed by the print head. The first vertical plate is connected to the end of the first horizontal plate away from the second horizontal plate, and the second vertical plate is connected to the end of the second horizontal plate away from the first horizontal plate. The first fixing member is slidably disposed above the first horizontal plate, and the second fixing member is slidably disposed above the second horizontal plate.

[0006] In some embodiments, an attached vibrator is also included, wherein an attached vibrator is provided on both the side of the first vertical plate away from the second vertical plate and the side of the second vertical plate away from the first vertical plate.

[0007] In some embodiments, the first fixing member includes a first horizontal plate and a first vertical plate that are vertically fixedly connected, and the second fixing member includes a second horizontal plate and a second vertical plate that are vertically fixedly connected. A first sliding groove is fixedly provided below the first horizontal plate, and a first slider is fixedly provided on the first horizontal plate. The first slider is slidably disposed in the first sliding groove. A second sliding groove is fixedly provided below the second horizontal plate, and a second slider is fixedly provided on the second horizontal plate. The second slider is slidably disposed in the second sliding groove. The first horizontal plate extends along the length direction of the first horizontal plate, and the second horizontal plate extends along the length direction of the second horizontal plate. The first vertical plate is fixedly connected to one end of the first horizontal plate near the second horizontal plate, and the second vertical plate is fixedly connected to one end of the second horizontal plate near the first horizontal plate.

[0008] In some embodiments, the device further includes a first intermediate component, a second intermediate component, a first limiting plate, and a second limiting plate. The first intermediate component is fixedly connected to the first vertical plate, and the second intermediate component is fixedly connected to the second vertical plate. The first limiting plate includes a first arc-shaped plate, and the second limiting plate includes a second arc-shaped plate. The first arc-shaped plate and the second arc-shaped plate form a circular space. The first arc-shaped plate is fixedly connected to the first intermediate component, and the second arc-shaped plate is fixedly connected to the second intermediate component. The print head includes a print head body and a fixing plate. The fixing plate is fixedly disposed on opposite sides of the print head body. There is a gap between the first arc-shaped plate and the second arc-shaped plate. The print head body is located within the circular space, and the fixing plate extends into the gap. The output end of the telescopic device is fixedly connected to the intermediate component. The slider is preferably configured as a T-shaped slider, and the slide groove is preferably configured as a T-shaped slide groove.

[0009] In some embodiments, the first limiting plate further includes a first extension piece and a second extension piece, the first extension piece and the second extension piece being fixedly connected to both ends of the first arc-shaped plate, and the second limiting plate further includes a third extension piece and a fourth extension piece, the third extension piece and the fourth extension piece being fixedly connected to both ends of the second arc-shaped plate, one of the fixing pieces being able to extend into the gap between the first extension piece and the third extension piece, and the other fixing piece being able to extend into the gap between the second extension piece and the fourth extension piece.

[0010] In some embodiments, a first opening is provided in the middle of the first arc-shaped plate and the middle of the second arc-shaped plate, and a second opening is provided in the first intermediate member and the second intermediate member. Bolts can pass through the first opening and the second opening to fix the arc-shaped plate and the intermediate member.

[0011] In some embodiments, the first horizontal plate, the first vertical plate, the second horizontal plate, the second vertical plate, the first intermediate member, and the second intermediate member are all groove-shaped.

[0012] In some embodiments, the inner wall dimension of the first intermediate component is the same as the outer wall dimension of the first vertical plate, and the first intermediate component is interference-fitted with the first vertical plate; the inner wall dimension of the second intermediate component is the same as the outer wall dimension of the second vertical plate, and the second intermediate component is interference-fitted with the second vertical plate.

[0013] In some embodiments, the device further includes a drive motor, a motor bracket, a gear, and a rack. The motor bracket is fixedly connected to a fixing member, the drive motor is fixedly mounted on the motor bracket, the drive motor is arranged parallel to the vertical plate, the output shaft of the drive motor is fixedly connected to the gear shaft of the gear, the rack extends along the length direction of the horizontal plate, and the end of the rack is fixedly connected to the slider. The gear meshes with the rack.

[0014] The present invention achieves the following technical effects compared to the prior art: The concrete 3D printing device provided by this invention features a first smoothing baffle slidably connected to a first fixing member, and a second smoothing baffle slidably connected to a second fixing member. Both the first and second smoothing baffles can slide horizontally relative to the first and second fixing members, allowing the distance between them to change and adapting to smoothing walls of different sizes. Furthermore, the print head is circumferentially fixed relative to the first and second fixing members. Adjusting the first and second smoothing baffles adjusts the distance between them and the print head, ensuring the print head remains centered within the gap between them. Both the first and second smoothing baffles are connected to the printer frame via telescopic devices, allowing them to change height independently. Since the print head and the fixing components can slide axially, the raising and lowering of the smoothing baffles does not affect the print head's operation. When printing in inconvenient locations such as corners, the smoothing baffle closest to the corner can be moved upwards and retracted, leaving only the smoothing baffle on the outer side of the corner intact. This avoids interference, ensures a good smoothing effect, and is applicable to a wide range of scenarios, guaranteeing high smoothing coverage and providing excellent performance in various working conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the concrete 3D printing device in some embodiments of the present invention; Figure 2 This is a schematic diagram of the connection structure between the fixing member and the intermediate member in some embodiments of the present invention; Figure 3 This is a schematic diagram of the structure of the middleware in some embodiments of the present invention; Figure 4 This is a schematic diagram of the limiting plate in some embodiments of the present invention; Figure 5 This is a schematic diagram illustrating the arrangement of the limiting plate and the print head in some embodiments of the present invention; Figure 6 This is a schematic diagram illustrating the arrangement of the rack and slider in some embodiments of the present invention; Figure 7 This is a schematic diagram of the printhead structure in some embodiments of the present invention.

[0017] In the diagram: 1-First smoothing baffle; 101-First vertical plate; 102-First horizontal plate; 2-Second smoothing baffle; 21-Second vertical plate; 22-Second horizontal plate; 3-First fixing component; 31-First horizontal plate; 32-First vertical plate; 4-Second fixing component; 41-Second horizontal plate; 42-Second vertical plate; 5-Attached vibrator; 6-Second intermediate component; 7-First intermediate component; 71-Second opening; 8-First limiting plate; 81-First arc plate; 82-First extension piece; 83-Second extension piece; 9-Second limiting plate; 91-Second arc plate; 92-Third extension piece; 93-Fourth extension piece; 10-First opening; 11-Drive motor; 12-Motor bracket; 13-Gear; 14-Print head body; 15-Fixing piece; 16-Slider; 17-Rack. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a concrete 3D printing device to solve the problems existing in the prior art, which has a wide range of applications and can ensure a good smoothing effect.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1-4 As shown, the present invention provides a concrete 3D printing device, including a first smoothing baffle 1, a second smoothing baffle 2, a first fixing member 3, a second fixing member 4, a telescopic device, a print head, and a printer frame. The print head is disposed on the printer frame and located below the printer frame and can move relative to the printer frame. The first smoothing baffle 1 and the second smoothing baffle 2 are disposed opposite each other, and the inner walls of the first smoothing baffle 1 and the second smoothing baffle 2 are used for smoothing concrete. The first fixing member 3 is slidably disposed above the first smoothing baffle 1, and the second fixing member 4 is slidably disposed above the second smoothing baffle 2. The print head can form a circumferential fixed and axially sliding connection with the first fixing member 3 and the second fixing member 4. The printer frame is connected to the first smoothing baffle 1 and the second smoothing baffle 2 through the telescopic device, and the telescopic device is slidably sleeved on the printer frame. The horizontal movement of the print head can drive the telescopic device to move. The first smoothing baffle 1 and the second smoothing baffle 2 can both slide along the axial direction of the print head.

[0022] Because the first smoothing baffle 1 is slidably connected to the first fixing member 3, and the second smoothing baffle 2 is slidably connected to the second fixing member 4, the first smoothing baffle 1 can slide relative to the first fixing member 3 in the horizontal direction, and the second smoothing baffle 2 can slide relative to the second fixing member 4 in the horizontal direction. This allows the distance between the first smoothing baffle 1 and the second smoothing baffle 2 to change, thus adapting to smoothing walls of different sizes. Furthermore, since the print head is circumferentially fixed relative to the first fixing member 3 and the second fixing member 4, adjusting the first smoothing baffle 1 and the second smoothing baffle 2 can adjust the distance between the smoothing baffle and the print head. This adjustment ensures that the print head is always positioned at the center of the gap between the first smoothing baffle 1 and the second smoothing baffle 2. Both the first smoothing baffle 1 and the second smoothing baffle 2 are connected to the printer frame via a telescopic device, allowing the first smoothing baffle 1 and the second smoothing baffle 2 to change in height. Furthermore, the heights of the first smoothing baffle 1 and the second smoothing baffle 2 can change independently. Since the print head and the fixing component can slide axially, the raising and lowering of the smoothing baffles will not affect the operation of the print head. When printing in inconvenient locations such as corners, the smoothing baffle on the inner side of the corner can be moved upwards and retracted, leaving only the smoothing baffle on the outer side of the corner intact, thus avoiding interference and ensuring a good smoothing effect. It is applicable to a wide range of scenarios, guarantees a high smoothing coverage rate, and can be effectively used in various working conditions.

[0023] In some embodiments, the first smoothing baffle 1 includes a first horizontal plate 102 and a first vertical plate 101 vertically fixedly connected, and the second smoothing baffle 2 includes a second horizontal plate 22 and a second vertical plate 21 vertically fixedly connected. Both the first horizontal plate 102 and the second horizontal plate 22 are horizontally arranged, and a gap exists between them to provide space for the concrete ejected from the print head. The first vertical plate 101 is connected to the end of the first horizontal plate 102 away from the second horizontal plate 22, and the second vertical plate 21 is connected to the end of the second horizontal plate 22 away from the first horizontal plate 102. A first fixing member 3 is slidably disposed above the first horizontal plate 102, and a second fixing member 4 is slidably disposed above the second horizontal plate 22. The vertical fixed connection of the horizontal and vertical plates forms an L-shaped structure, resulting in higher overall rigidity. During smoothing operations, it can withstand the lateral pressure of the concrete, reducing deformation and ensuring smoothing accuracy. The horizontally positioned first horizontal plate 102 and second horizontal plate 22 can flatten the top of the printing strip, ensuring the flatness between layers. The first vertical plate 101 and second vertical plate 21 are located outside the horizontal plates, respectively, and can vertically trim the two sides of the printed wall, achieving all-round smoothing of the top and sides, solving the problem that traditional devices can only handle one direction. The gap between the two horizontal plates provides a dedicated channel for concrete extrusion, ensuring that the concrete sprayed from the print head passes smoothly, and allowing the horizontal plate to immediately smooth the surface after the print head, reducing the difficulty of trimming after the initial setting of the concrete.

[0024] In some embodiments, the concrete 3D printing apparatus further includes an attached vibrator 5, with an attached vibrator 5 installed on both the side of the first vertical plate 101 facing away from the second vertical plate 21 and the side of the second vertical plate 21 facing away from the first vertical plate 101. The high-frequency vibration generated by the vibrator can be transmitted to the freshly printed concrete strips, effectively expelling air bubbles inside the concrete, reducing porosity, enhancing structural density and mechanical properties, and reducing the risk of later cracking. Simultaneous printing allows for a certain degree of compaction, avoiding weak interlayer bonding due to poor adhesion between upper and lower strips and the presence of gaps, thus improving the overall performance and safety of the 3D-printed concrete structure to some extent.

[0025] In some embodiments, the first fixing member 3 includes a first horizontal plate 31 and a first vertical plate 32 that are vertically fixedly connected, and the second fixing member 4 includes a second horizontal plate 41 and a second vertical plate 42 that are vertically fixedly connected. A first sliding groove is fixedly provided below the first horizontal plate 31, and a first slider is fixedly provided on the first horizontal plate 102. Preferably, the first horizontal plate 102 and the first slider are connected by bolts, and the first slider is slidably disposed in the first sliding groove. A second sliding groove is fixedly provided below the second horizontal plate 41, and a second slider is fixedly provided on the second horizontal plate 22. Preferably, the second horizontal plate 22 and the second slider are connected by bolts, and the second slider is slidably disposed in the second sliding groove. The first horizontal plate 31 extends along the length direction of the first horizontal plate 102, and the second horizontal plate 41 extends along the length direction of the second horizontal plate 22. The first vertical plate 32 is fixedly connected to the end of the first horizontal plate 31 near the second horizontal plate 41, and the second vertical plate 42 is fixedly connected to the end of the second horizontal plate 41 near the first horizontal plate 31. The fixing members adopt a vertical fixing structure of horizontal plates connecting vertical plates to form a stable L-shaped support frame. The horizontal plate extends along the length of the transverse plate, providing ample mounting foundation and load-bearing structure for the chute; the vertical plate enhances the overall torsional resistance of the fixing components, making them less prone to deformation when subjected to the reaction forces of the vibrator and smoothing operations. Furthermore, the slider and transverse plate are bolted together, allowing for easy disassembly and replacement of the smoothing baffle. Different types of smoothing baffles can be used to meet various working conditions; for example, the inner surface of the smoothing baffle can be rough or smooth, allowing for selection of the appropriate baffle based on actual needs.

[0026] In some embodiments, the concrete 3D printing device further includes a first intermediate component 7, a second intermediate component 6, a first limiting plate 8, and a second limiting plate 9. The first intermediate component 7 is fixedly connected to the first vertical plate 32, and the second intermediate component 6 is fixedly connected to the second vertical plate 42. The first limiting plate 8 includes a first arc-shaped plate 81, and the second limiting plate 9 includes a second arc-shaped plate 91. The first arc-shaped plate 81 and the second arc-shaped plate 91 form a circular space. The first arc-shaped plate 81 is fixedly connected to the first intermediate component 7, and the second arc-shaped plate 91 is fixedly connected to the second intermediate component 6. The printing head includes a printing head body 14 and a fixing plate 15. The fixing plate 15 is fixedly disposed on opposite sides of the printing head body. There is a gap between the first arc-shaped plate 81 and the second arc-shaped plate 91. The printing head body is located in the circular space, and the fixing plate 15 extends into the gap. The first arc-shaped plate 81 and the second arc-shaped plate 91 form a circular space in which the printhead body is placed. This space can surround the printhead from all directions, limiting its radial sway and ensuring that the printhead maintains a stable posture during operation, avoiding printing deviation caused by vibration or external force. The fixing plate extends into the gap between the arc-shaped plates, forming a circumferential limit. When the printhead moves horizontally, it can push the fixing plate to move, thereby pushing the smoothing baffle to move.

[0027] In some embodiments, the first limiting plate 8 further includes a first extension piece 82 and a second extension piece 83, which are respectively fixedly connected to both ends of the first arc-shaped plate 81. The second limiting plate 9 further includes a third extension piece 92 and a fourth extension piece 93, which are respectively fixedly connected to both ends of the second arc-shaped plate 91. One fixing piece 15 can extend into the gap between the first extension piece 82 and the third extension piece 92, and the other fixing piece 15 can extend into the gap between the second extension piece 83 and the fourth extension piece 93. The fixing pieces 15 on both sides of the printhead extend into the gap between the first extension piece 82 and the third extension piece 92, and the gap between the second extension piece 83 and the fourth extension piece 93, respectively, forming a two-point circumferential constraint. Furthermore, the contact between the extension piece and the fixing piece 15 is a surface contact, with a large contact area and stable force transmission.

[0028] In some embodiments, a first opening 10 is provided in the middle of the first arc-shaped plate 81 and the middle of the second arc-shaped plate 91, and a second opening 71 is provided in the first intermediate member 7 and the second intermediate member 6. Bolts can pass through the first opening 10 and the second opening 71 to fix the arc-shaped plate to the intermediate member. The bolts pass through the first opening 10 in the middle of the arc-shaped plate and the second opening 71 in the intermediate member to form a rigid fixed connection. The bolt connection is a detachable assembly. During installation, the position of the arc-shaped plate can be finely adjusted by adjusting the tightness of the bolts to ensure that the first arc-shaped plate 81 and the second arc-shaped plate 91 accurately form a circular space, ensuring the centering positioning accuracy of the print head. Furthermore, the detachable bolt connection between the intermediate member and the arc-shaped plate allows the intermediate member and the arc-shaped plate to be separated, enabling the device to be used independently when the smoothing baffle is not applicable.

[0029] In some embodiments, the first horizontal plate 31, the first vertical plate 32, the second horizontal plate 41, the second vertical plate 42, the first intermediate component 7, and the second intermediate component 6 are all channel-shaped. Channel-shaped structures have high bending and shear strength, effectively withstanding large loads. In concrete 3D printing devices, these components can better support the weight of the print head and other related components, and resist external forces generated during printing such as concrete extrusion, ensuring the stability and safety of the entire device. Simultaneously, channel-shaped structures have good rigidity, are not easily deformed under external forces, and maintain overall structural stability. Furthermore, the hollow interior of the channel-shaped structure, compared to a solid structure, results in a lighter overall weight, which helps reduce the overall weight of the concrete 3D printing device, making it easier to move and install, and also reducing the requirements for supporting foundations.

[0030] In some embodiments, the inner wall dimension of the first intermediate component 7 is the same as the outer wall dimension of the first vertical plate 32, and the first intermediate component 7 and the first vertical plate 32 are interference-fitted. The inner wall dimension of the second intermediate component 6 is the same as the outer wall dimension of the second vertical plate 42, and the second intermediate component 6 and the second vertical plate 42 are interference-fitted. The interference fit achieves a tight fit between the two after assembly by utilizing the dimensional difference between the inner wall of the intermediate component and the outer wall of the vertical plate. A strong connection can be formed without additional fasteners, which can effectively resist external forces such as high-frequency vibration of the vibrator and concrete extrusion reaction force. Furthermore, the interference fit connection makes disassembly and installation more convenient. In cases where smoothing is not required, the intermediate component can be separated from the fixing component, thereby removing the smoothing baffle and performing printing operations alone.

[0031] In some embodiments, the concrete 3D printing device further includes a drive motor 11, a motor bracket 12, a gear 13, and a rack 17. The motor bracket 12 is fixedly connected to a fixing member. The drive motor 11 is fixedly mounted on the motor bracket 12 and is arranged parallel to the vertical plate. The output shaft of the drive motor 11 is fixedly connected to the gear shaft of the gear 13. The rack 17 extends along the length direction of the horizontal plate, and its end is fixedly connected to the slider 16. The gear 13 and the rack 17 are meshed together. The drive motor 11 transmits rotational motion through the meshing of the gear 13 and the rack 17, converting the rotational motion into linear motion of the slider 16 (and the smoothing baffle). By controlling the motor speed and direction, the distance between the two smoothing baffles can be precisely adjusted to adapt to different wall width requirements.

[0032] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A concrete 3D printing device, characterized in that: The system includes a first smoothing baffle, a second smoothing baffle, a first fixing member, a second fixing member, a telescopic device, a print head, and a printer frame. The print head is mounted on the printer frame and located below the printer frame, and is movable relative to the printer frame. The first smoothing baffle and the second smoothing baffle are arranged opposite each other, and their inner walls are used for smoothing concrete. The first fixing member is slidably disposed above the first smoothing baffle, and the second fixing member is slidably disposed above the second smoothing baffle. The print head is circumferentially fixed and axially slidably connected to the first and second fixing members. The printer frame is connected to both the first and second smoothing baffles via the telescopic device, and the telescopic device is slidably sleeved on the printer frame. Horizontal movement of the print head can drive the telescopic device to move. Both the first and second smoothing baffles are slidable along the axial direction of the print head.

2. The concrete 3D printing device according to claim 1, characterized in that: The first smoothing baffle includes a first horizontal plate and a first vertical plate that are vertically fixedly connected. The second smoothing baffle includes a second horizontal plate and a second vertical plate that are vertically fixedly connected. Both the first horizontal plate and the second horizontal plate are horizontally arranged and there is a gap between them. The gap is used to provide space for the concrete sprayed by the print head to pass through. The first vertical plate is connected to the end of the first horizontal plate away from the second horizontal plate, and the second vertical plate is connected to the end of the second horizontal plate away from the first horizontal plate. The first fixing member is slidably disposed above the first horizontal plate, and the second fixing member is slidably disposed above the second horizontal plate.

3. The concrete 3D printing device according to claim 2, characterized in that: It also includes an attached vibrator, with one attached vibrator provided on the side of the first vertical plate away from the second vertical plate and on the side of the second vertical plate away from the first vertical plate.

4. The concrete 3D printing device according to claim 2, characterized in that: The first fixing member includes a first horizontal plate and a first vertical plate that are vertically fixedly connected. The second fixing member includes a second horizontal plate and a second vertical plate that are vertically fixedly connected. A first sliding groove is fixedly provided below the first horizontal plate. A first slider is fixedly provided on the first horizontal plate and is slidably disposed in the first sliding groove. A second sliding groove is fixedly provided below the second horizontal plate. A second slider is fixedly provided on the second horizontal plate and is slidably disposed in the second sliding groove. The first horizontal plate extends along the length direction of the first horizontal plate, and the second horizontal plate extends along the length direction of the second horizontal plate. The first vertical plate is fixedly connected to one end of the first horizontal plate near the second horizontal plate, and the second vertical plate is fixedly connected to one end of the second horizontal plate near the first horizontal plate.

5. The concrete 3D printing device according to claim 4, characterized in that: It also includes a first intermediate component, a second intermediate component, a first limiting plate, and a second limiting plate. The first intermediate component is fixedly connected to the first vertical plate, and the second intermediate component is fixedly connected to the second vertical plate. The first limiting plate includes a first arc-shaped plate, and the second limiting plate includes a second arc-shaped plate. The first arc-shaped plate and the second arc-shaped plate form a circular space. The first arc-shaped plate is fixedly connected to the first intermediate component, and the second arc-shaped plate is fixedly connected to the second intermediate component. The print head includes a print head body and a fixing plate. The fixing plate is fixedly disposed on opposite sides of the print head body. There is a gap between the first arc-shaped plate and the second arc-shaped plate. The print head body is located within the circular space, and the fixing plate extends into the gap. The output end of the telescopic device is fixedly connected to the intermediate component.

6. The concrete 3D printing apparatus according to claim 5, characterized in that: The first limiting plate further includes a first extension piece and a second extension piece, which are respectively fixedly connected to both ends of the first arc-shaped plate. The second limiting plate further includes a third extension piece and a fourth extension piece, which are respectively fixedly connected to both ends of the second arc-shaped plate. One of the fixing pieces can extend into the gap between the first extension piece and the third extension piece, and the other fixing piece can extend into the gap between the second extension piece and the fourth extension piece.

7. The concrete 3D printing device according to claim 5, characterized in that: Both the first arc-shaped plate and the second arc-shaped plate have a first opening in their middle portions, and both the first intermediate component and the second intermediate component have a second opening. Bolts can pass through the first opening and the second opening to fix the arc-shaped plate and the intermediate component.

8. The concrete 3D printing apparatus according to claim 5, characterized in that: The first horizontal plate, the first vertical plate, the second horizontal plate, the second vertical plate, the first intermediate component, and the second intermediate component are all groove-shaped.

9. The concrete 3D printing device according to claim 8, characterized in that: The inner wall dimension of the first intermediate component is the same as the outer wall dimension of the first vertical plate, and the first intermediate component is interference-fitted with the first vertical plate. The inner wall dimension of the second intermediate component is the same as the outer wall dimension of the second vertical plate, and the second intermediate component is interference-fitted with the second vertical plate.

10. The concrete 3D printing device according to claim 4, characterized in that: It also includes a drive motor, a motor bracket, a gear, and a rack. The motor bracket is fixedly connected to a fixing member. The drive motor is fixedly mounted on the motor bracket and is arranged parallel to the vertical plate. The output shaft of the drive motor is fixedly connected to the gear shaft of the gear. The rack extends along the length direction of the horizontal plate, and the end of the rack is fixedly connected to the slider. The gear meshes with the rack.

Images