A concrete 3D printing device

Abstract

The utility model provides a kind of concrete 3D printing device, including motion execution mechanism, double-layer connecting seat, feed pipe, printing nozzle and yarn cage;Double-layer connecting seat includes upper flange, lower flange and transition side plate, upper flange and lower flange are oppositely arranged and are connected with transition side plate respectively, upper flange, lower flange and transition side plate form a connecting seat accommodating space, and motion execution mechanism is fixed above upper flange.Feed pipe is arranged in connecting seat accommodating space, and feed pipe includes a feed port, an opening is formed on transition side plate, and feed port is arranged in the opening.The concrete 3D printing device can directly use commercial large yarn group fiber, without secondary winding treatment, reducing material loss and cost in processing process;At the same time, the installation and disassembly of large yarn group are convenient, which reduces the influence on printing process when replacing fiber yarn group;All components in printing device are movably linked, which is convenient for cleaning and replacement.

Description

Technical Field

[0001] This utility model relates to the field of concrete 3D printing, specifically to a concrete 3D printing device. Background Technology

[0002] Concrete 3D printing technology is an extension of additive manufacturing technology in the field of advanced manufacturing to the construction industry. It is a new construction technology that integrates knowledge from multiple disciplines such as mechanics, electronics, control, civil engineering, architecture, and materials, and is one of the key means to achieve integrated manufacturing and construction. By stacking materials layer by layer, 3D printing technology can automatically complete the construction of buildings, structures, or building components in a short time. It has advantages such as high efficiency, cost reduction, material conservation, environmental protection, and breaking through the limitations of traditional design, representing one of the ways to transform the production mode of the future construction industry.

[0003] Traditional 3D printing technology for construction suffers from significant drawbacks. The lack of tensile strength, characteristic of reinforced concrete, leads to insufficient concrete strength and deformation performance. Once cracks appear, the tensile strength is completely lost, making the component highly susceptible to progressive failure and even the collapse of the entire structure. Using continuous fibers as reinforcement solves this problem. By impregnating and pulling the continuous fibers with mortar, they are evenly laid within the printed component without external force, forming a reinforced structure. Furthermore, the excellent chemical stability, flame retardant properties, and cement compatibility of continuous fibers make the printed components suitable for various applications. However, current 3D printing technologies using continuous fibers do not consider practical engineering applications, requiring frequent fiber replacements, hindering long-term continuous printing, and compromising stability during the printing process. Utility Model Content

[0004] This utility model provides a concrete 3D printing device, which aims to solve the problems of existing concrete 3D printing that cannot achieve long-term continuous printing and cannot guarantee the stability of the printing process.

[0005] This utility model provides a concrete 3D printing device, comprising: Motion execution mechanism; A double-layer connecting seat, comprising an upper flange, a lower flange, and a transition side plate, wherein the upper flange and the lower flange are arranged opposite to each other and are respectively connected to the transition side plate, and the upper flange, the lower flange, and the transition side plate form a connecting seat accommodating space, and the motion actuator is fixed above the upper flange; A feed pipe is disposed in the receiving space of the connecting seat. The feed pipe includes a feed port. An opening is formed on the transition side plate, and the feed port is disposed in the opening. A printing nozzle is fixed below the lower flange and fixedly connected to the feed pipe. The inlet of the printing nozzle is connected to the outlet of the feed pipe. A yarn-threading tube is formed on the side of the printing nozzle. A yarn cage, the top of which is fixed below the lower flange, is used to hold continuous fibers. A through hole is formed at the bottom of the yarn cage. One end of the continuous fiber passes through the through hole to extend out of the yarn cage, and the end of the continuous fiber extending out of the yarn cage extends into the yarn feeding tube to enter the printing nozzle.

[0006] In some possible embodiments, the printing nozzle includes: a feed tube holder and a concrete nozzle; A feed pipe fixing seat is fixedly connected to the lower flange, and the feed pipe is fixedly connected to the feed pipe fixing seat; A concrete nozzle is fixed to the feed pipe fixing seat on the side away from the double-layer connecting seat.

[0007] In some possible embodiments, the printing nozzle further includes: a conversion joint and a yarn feeding device, wherein the outlet of the feed tube protrudes from the feed tube fixing seat, the conversion joint is fixed at the outlet of the feed tube and threadedly connected to the outlet of the feed tube, the top of the yarn feeding device is connected to the conversion joint by a clamp, and the bottom of the yarn feeding device is threadedly connected to the concrete nozzle.

[0008] In some possible embodiments, the yarn feeding device includes: A mortar pipe, the top of which is connected to the conversion joint by a clamp; A threading tube fixing seat is formed on the side wall of the mortar tube, and the portion of the threading tube fixing seat protruding from the mortar tube is inclined relative to the mortar tube. A threading tube is provided, which passes through the threading tube fixing seat and the bottom of the threading tube extends into the mortar tube. The threading tube is fixed in the threading tube fixing seat by a set screw and is inclined relative to the mortar tube.

[0009] In some possible embodiments, the concrete 3D printing device further includes a connecting seat disposed between the motion actuator and the double-layer connecting seat. The motion actuator is connected to the upper part of the connecting seat via a flange, and the lower part of the connecting seat is connected to the upper flange of the double-layer connecting seat via a flange.

[0010] In some possible embodiments, the gauze cage includes a cover plate, a fixed side plate, a movable side plate, a connecting block, and a bottom plate. The cover plate and the bottom plate are arranged opposite to each other and connected by the fixed side plate. The connecting block is installed on the top of the cover plate. The movable side plate passes through the cover plate and the bottom plate in sequence, and the movable side plate can move in the vertical direction.

[0011] In some possible embodiments, the concrete 3D printing device further includes a hinge, one end of which is fixedly connected to the lower flange of the double-layer connecting seat, and the other end of which is fixedly connected to the connecting block of the gauze to connect the double-layer connecting seat to the gauze.

[0012] In some possible embodiments, there are multiple yarn cages, all of which are fixed below the lower flange and arranged around the feed pipe fixing seat.

[0013] In some possible embodiments, the motion actuator is a gantry manipulator structure or an end joint structure of a six-axis manipulator.

[0014] In some possible embodiments, the concrete 3D printing apparatus further includes a concrete mixing device for mixing concrete, wherein the outlet of the concrete mixing device is connected to the inlet of the feed pipe.

[0015] This utility model provides a concrete 3D printing device, including a motion actuator; a double-layer connecting seat, which includes an upper flange, a lower flange, and a transition side plate. The upper flange and the lower flange are arranged opposite to each other and are respectively connected to the transition side plate. The upper flange, the lower flange, and the transition side plate form a connecting seat accommodating space. The motion actuator is fixed above the upper flange; a feed pipe, which is disposed in the connecting seat accommodating space and includes a feed port. An opening is formed on the transition side plate, and the feed port is disposed in the opening; a printing nozzle, which is fixed below the lower flange and fixedly connected to the feed pipe. The feed port of the printing nozzle is connected to the discharge port of the feed pipe, and a yarn-passing tube is formed on the side of the printing nozzle; a yarn cage, the top of which is fixed below the lower flange. The yarn cage is used to hold continuous fibers, and a through hole is formed at the bottom of the yarn cage. One end of the continuous fiber passes through the through hole to extend out of the yarn cage, and the end of the continuous fiber extending out of the yarn cage extends into the yarn-passing tube to enter the printing nozzle. The concrete 3D printing device provided by this utility model can directly utilize commercial large yarn bundles of fiber without secondary winding, reducing material loss and costs during the process; at the same time, the installation and disassembly of the large yarn bundles are convenient, reducing the impact on the printing process when replacing fiber yarn bundles; all components of the printing device are connected by movable links, which facilitates cleaning and replacement. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the external structure of the concrete 3D printing device provided in this embodiment of the utility model; Figure 2 This is a schematic diagram of the internal structure of the concrete 3D printing device provided in this embodiment of the utility model; Figure 3 This is a schematic diagram of the structure of a gauze cage according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of an embodiment of the yarn feeding device provided in this utility model. Detailed Implementation

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

[0019] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, 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. They 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, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0023] This utility model provides a concrete 3D printing device, which mainly utilizes concrete and continuous fibers for 3D printing. The device primarily comprises a motion actuator 11, a double-layer connecting seat 2, a feed pipe 3, a printing nozzle, a gauze cage, and other functional modules. The following is a detailed description with reference to the accompanying drawings: Please refer to Figures 1-4The concrete 3D printing device provided by this utility model includes a motion actuator 11, which is mainly used to drive the movement of other functional modules in the 3D printing device to perform the specific printing process. In some embodiments, the motion actuator 11 can be a truss manipulator structure or the end joint structure of a six-axis manipulator. The concrete 3D printing device provided by this utility model also includes a double-layer connecting seat 2, which is a double-layer connecting flange, specifically including an upper flange 21, a transition side plate 22, and a lower flange 23. The upper flange 21 and the lower flange 23 are arranged opposite to each other, and are connected by the transition side plate 22; the upper flange 21, the lower flange 23, and the transition side plate 22 form a connecting seat accommodating space. The motion actuator 11 is fixed above the upper flange 21. It also includes a feed pipe 3, which is mainly used to receive concrete for printing. The feed pipe 3 is set in the aforementioned connecting seat accommodating space, and an opening is formed on the transition side plate 22 of the double-layer connecting seat 2. The feed port of the feed pipe 3 is set in the opening, and the external concrete can enter the printing device through the feed port of the feed pipe 3 and participate in the 3D printing process.

[0024] The concrete 3D printing device provided by this utility model also includes a printing nozzle, which can spray concrete for printing and is the main functional module for realizing 3D printing. The printing nozzle in this utility model is fixed below the lower flange 23, and the inlet of the printing nozzle is connected to the outlet of the feed pipe 3. Since this utility model uses concrete and continuous fibers for 3D printing, the concrete 3D printing device also includes a gauze cage 5 for placing the continuous fibers; specifically, the top of the gauze cage 5 is also fixed below the lower flange 23, and the gauze cage 5 has a hollow structure similar to a birdcage, with the continuous fibers placed inside. Simultaneously, a through hole is formed at the bottom of the gauze cage 5, and one end of the continuous fiber passes through the through hole at the bottom of the gauze cage 5 to extend out of the gauze cage 5; a threading tube is formed on the side of the printing nozzle, and the end of the continuous fiber extending from the gauze cage 5 also needs to extend into the threading tube to enter the printing nozzle. Thus, during 3D printing, concrete and continuous fibers can be sprayed out from the nozzle together for printing.

[0025] Please continue to refer to this. Figure 1 and Figure 2The printing nozzle provided by this utility model includes a feed pipe fixing seat 7, a conversion joint 8, a yarn feeding device 9, and a concrete nozzle 10. The feed pipe fixing seat 7 is fixedly connected to the lower flange 23 of the double-layer connecting seat 2, and the feed pipe 3 is fixedly connected to the feed pipe fixing seat 7. Specifically, the feed pipe 3 can be an L-shaped structure. The feed inlet of the feed pipe 3 is located at the opening of the transition side plate 22. A slot is formed on the lower flange 23, and the discharge outlet of the feed pipe 3 passes through the slot on the lower flange 23. The feed pipe 3 is connected to the feed pipe fixing seat 7 by a clamp. The discharge outlet of the feed pipe 3 protrudes from the feed pipe fixing seat 7 and is threadedly connected to the conversion joint 8, i.e., the conversion joint 8 is located at the end of the feed pipe 3 furthest from the double-layer connecting seat 2. The adapter is also connected to a yarn feeding device 9. Continuous fibers enter the printing nozzle through the yarn feeding device 9 to participate in 3D printing. The top of the yarn feeding device 9 is connected to the adapter 8 by a clamp, and the bottom of the yarn feeding device 9 is connected to the concrete nozzle 10 by a thread. This arrangement allows the concrete and continuous fibers to be mixed in the yarn feeding device 9 before being ejected from the concrete nozzle 10 for printing.

[0026] Please refer to Figure 3 The yarn feeding device 9 provided by this utility model includes: a yarn threading tube 91, a mortar tube 92, a yarn threading tube fixing seat 93, and a top screw 94; wherein, the top of the mortar tube 92 is connected to the conversion joint 8 by a clamp, thereby connecting the yarn feeding device to the feed pipe 3, and the bottom of the mortar tube 92 is connected to the concrete nozzle 10 by a thread. Figure 3 In the illustrated embodiment, a threading tube fixing seat 93 is formed on the side wall of the mortar pipe 92, and the portion of the threading tube fixing seat 93 protruding from the mortar pipe 92 is inclined relative to the mortar pipe 92; while the threading tube 91 passes through the threading tube fixing seat 93, with the bottom of the threading tube 91 extending into the interior of the mortar pipe 92, so that the continuous fiber can be mixed with the concrete. The threading tube 91 also needs to be fixed in the threading tube fixing seat 93 by a set screw 94; specifically, a through hole is formed in the threading tube fixing seat 93, the set screw 94 is inserted into the through hole in the threading tube fixing seat 93, and the bottom of the set screw 94 contacts the threading tube 91 to fix the threading tube 91. At this time, the set screw 94 is parallel to the mortar pipe, and the threading tube 91 is inclined relative to the mortar pipe. Figure 3 In the embodiment shown, the mortar pipe 92 has a hollow structure, and the middle part of the mortar pipe 92 is funnel-shaped; this is because concrete is relatively viscous, and the funnel shape facilitates the complete flow of concrete. The bottom of the fiber-threading tube is located at the bottom of the funnel shape of the mortar pipe 92, so that when the concrete flows out from the funnel structure, it can be directly mixed with the continuous fibers.

[0027] The concrete 3D printing device provided by this utility model also includes a connecting seat 1, which is disposed between the motion actuator 11 and the double-layer connecting seat 2. The upper part of the motion actuator 11 is connected to the connecting seat 1 via a flange, and the lower part of the connecting seat 1 is connected to the upper flange of the double-layer connecting seat 2. The connecting seat 1 itself is also in the form of an upper and lower flange structure. The flange form of the connecting seat 1 can be changed according to the interface form of the motion actuator 11, which will not be described in detail here.

[0028] Please refer to Figure 4 This is a schematic diagram of an embodiment of the gauze provided by this utility model. Figure 4 The gauze cage 5 includes a cover plate 51, a fixed side plate 52, a movable side plate 53, a connecting block 54, and a bottom plate 55. The cover plate 51 and the bottom plate 55 are arranged opposite each other and connected by the fixed side plate 52. The connecting block 54 is installed on the top of the cover plate 51. Slots are formed on both the cover plate 51 and the bottom plate 55. The movable side plate 53 passes through the cover plate 51 and the bottom plate 55 sequentially and is movably connected to them. The movable side plate 53 can move vertically up and down. The concrete 3D printing device also includes a hinge 4. One end of the hinge 4 is fixedly connected to the lower flange of the double-layer connecting seat 2, and the other end of the hinge 4 is fixedly connected to the connecting block 54 in the gauze cage 5 to connect the double-layer connecting seat 2 and the gauze cage 5. The gauze cage 5 in this invention can be expanded or retracted according to actual needs under the control of the hinge 4. In this invention, there can be multiple yarn cages 5, each holding different large yarn balls (i.e., continuous fibers in a ball). The multiple yarn cages 5 are fixed below the lower flange 23 of the double-layer connecting seat 2 by different adhesives, and the multiple yarn cages 5 are arranged around the feed pipe fixing seat 7. The continuous fibers in the multiple yarn cages 5 need to extend into the printing nozzle according to actual needs.

[0029] The concrete 3D printing device provided by this utility model also includes a concrete mixing device (not shown in the figure), which is mainly used to mix concrete. The discharge port of the concrete mixing device needs to be connected to the inlet of the feed pipe 3 so that the mixed concrete can be transported to the printing nozzle through the feed pipe 3. For the concrete 3D printing device provided by this utility model, before printing begins, the upper flange 21, the transition side plate 22, the lower flange 23, and the feed pipe fixing seat 7 need to be connected from top to bottom using different bolts. Then, the feed pipe 3 passes through the notch on the feed pipe fixing seat 7 and the notch on the lower flange 23 in sequence, and the feed pipe 3 is connected and fixed to the feed pipe fixing seat 7 using a clamp. The connecting seat 1 is installed and fixed on the upper flange 21. Then, the above-mentioned assembled components are connected to the motion actuator 11 through the connecting seat 1. The conversion joint 8, the yarn feeding device 9, and the concrete nozzle 10 are installed to the lower end of the feed pipe 3 in sequence. Then, according to the printing requirements, arrange the required number of hinges 4 on the lower flange 23, and install the connecting blocks 54 of the gauze cage 5 onto the corresponding hinges 4 to connect the gauze cage 5 to the double-layer connecting seat. Next, open the movable side plate 53 on the gauze cage 5, place the large yarn bundle fiber 6 inside the gauze cage, close the movable side plate 53, and pass the fibers of the large yarn bundle fiber 6 through the through holes on the bottom plate 55, continuing through the yarn threading tube 91 to the inside of the concrete nozzle 10. Finally, connect the concrete pump pipe to the inlet of the feed pipe 3, and printing can begin.

[0030] During the printing process, when the fibers placed inside the yarn cage 5 are used up, simply open the movable side plate 53, remove the fiber tube, place the large yarn bundle fiber 6 back in, and follow the above steps to pass it through the bottom plate 55 and the yarn tube 91 to complete the fiber replacement. This fiber replacement operation is simple and can greatly save manpower and resources. After printing is completed, the print head needs to be cleaned. The concrete nozzle 10, yarn feeding device 9, and conversion connector 8 can be removed in sequence. Then, the yarn cage 5 can be unfolded outward through the hinge 4 to make room for removing the clamp connecting the feed pipe 3 and the feed pipe fixing seat 7. The feed pipe 3 can be passed through the notch between the lower flange 23 and the feed pipe fixing seat 7 in sequence, and the cleaning of each component can begin to complete the printing work. The concrete 3D printing device provided by this utility model adopts a split design, which facilitates the disassembly, cleaning and replacement of each component; at the same time, the gauze cage provided by this utility model can be adapted to all kinds of mature large gauze fibers on the market. The gauze cage is easy to replace and can achieve long-term continuous and stable printing, effectively solving the pain point that the continuous fiber concrete printing nozzles in the prior art cannot be well applied to actual engineering projects.

[0031] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0032] The concrete 3D printing device provided by the embodiments of this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solution and core idea of ​​this utility model. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A concrete 3D printing device, characterized in that, include: Motion execution mechanism; A double-layer connecting seat, comprising an upper flange, a lower flange, and a transition side plate, wherein the upper flange and the lower flange are arranged opposite to each other and are respectively connected to the transition side plate, and the upper flange, the lower flange, and the transition side plate form a connecting seat accommodating space, and the motion actuator is fixed above the upper flange; A feed pipe is disposed in the receiving space of the connecting seat. The feed pipe includes a feed port. An opening is formed on the transition side plate, and the feed port is disposed in the opening. A printing nozzle is fixed below the lower flange and fixedly connected to the feed pipe. The inlet of the printing nozzle is connected to the outlet of the feed pipe. A yarn-threading tube is formed on the side of the printing nozzle. A yarn cage, the top of which is fixed below the lower flange, is used to hold continuous fibers. A through hole is formed at the bottom of the yarn cage. One end of the continuous fiber passes through the through hole to extend out of the yarn cage, and the end of the continuous fiber extending out of the yarn cage extends into the yarn feeding tube to enter the printing nozzle.

2. The concrete 3D printing device according to claim 1, characterized in that, The printing nozzle includes: a feed pipe fixing seat and a concrete nozzle; A feed pipe fixing seat is fixedly connected to the lower flange, and the feed pipe is fixedly connected to the feed pipe fixing seat; A concrete nozzle is fixed to the feed pipe fixing seat on the side away from the double-layer connecting seat.

3. The concrete 3D printing device according to claim 2, characterized in that, The printing nozzle further includes: a conversion connector and a yarn feeding device. The outlet of the feed tube protrudes from the feed tube fixing seat. The conversion connector is fixed at the outlet of the feed tube and threadedly connected to the outlet of the feed tube. The top of the yarn feeding device is connected to the conversion connector by a clamp, and the bottom of the yarn feeding device is threadedly connected to the concrete nozzle.

4. The concrete 3D printing device according to claim 3, characterized in that, The yarn feeding device includes: A mortar pipe, the top of which is connected to the conversion joint by a clamp; A threading tube fixing seat is formed on the side wall of the mortar tube, and the portion of the threading tube fixing seat protruding from the mortar tube is inclined relative to the mortar tube. A threading tube is provided, which passes through the threading tube fixing seat and the bottom of the threading tube extends into the mortar tube. The threading tube is fixed in the threading tube fixing seat by a set screw and is inclined relative to the mortar tube.

5. The concrete 3D printing device according to claim 1, characterized in that, The concrete 3D printing device also includes a connecting seat, which is disposed between the motion actuator and the double-layer connecting seat. The motion actuator is connected to the upper part of the connecting seat via a flange, and the lower part of the connecting seat is connected to the upper flange of the double-layer connecting seat via a flange.

6. The concrete 3D printing apparatus according to claim 1, characterized in that, The gauze cage includes a cover plate, a fixed side plate, a movable side plate, a connecting block, and a bottom plate. The cover plate and the bottom plate are arranged opposite to each other and connected by the fixed side plate. The connecting block is installed on the top of the cover plate. The movable side plate passes through the cover plate and the bottom plate in sequence, and the movable side plate can move in the vertical direction.

7. The concrete 3D printing apparatus according to claim 6, characterized in that, The concrete 3D printing device also includes a hinge, one end of which is fixedly connected to the lower flange of the double-layer connecting seat, and the other end of which is fixedly connected to the connecting block of the gauze to connect the double-layer connecting seat to the gauze.

8. The concrete 3D printing device according to claim 1, characterized in that, There are multiple gauze cages, all of which are fixed below the lower flange and arranged around the feed pipe fixing seat.

9. The concrete 3D printing apparatus according to claim 1, characterized in that, The motion actuator is a gantry manipulator structure or the end joint structure of a six-axis manipulator.

10. The concrete 3D printing apparatus according to claim 1, characterized in that, The concrete 3D printing device also includes a concrete mixing device for mixing concrete, and the outlet of the concrete mixing device is connected to the inlet of the feed pipe.

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