Supporting and curing device for 3D printing concrete and working method of supporting and curing device

Abstract

The invention provides a supporting and curing device for 3D printing concrete and a working method of the supporting and curing device, and relates to the technical field of concrete forming and curing, the supporting and curing device comprises a gantry support, a splicing fence, a concrete stirring and discharging device, and a supporting mixture conveying, storing and laying device. The stirring and discharging device and the material storage and laying device regulate and control an extrusion type printing path and a sweeping type distance sensing switch through model slicing software correspondingly, concrete and supporting objects are output alternately, and it is ensured that the stacking heights of the two materials in each layer are kept consistent. According to the method, sand grains or shell powder, straw or corncob and other ecological environment-friendly materials are selected as a supporting mixture, and a microbial curing system is doped to improve the comprehensive performance of the concrete. By means of the semi-closed working area built through the spliced fences, large or complex-structure 3D printing concrete members are shaped and cured in the low-temperature dry environment. And a pulley sliding rail arranged in the gantry bracket is also convenient for continuous manufacturing and efficient loading and unloading of a plurality of sets of concrete members.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete forming and curing, and more specifically, to a support and curing device for 3D printed concrete and a working method thereof. Background Art

[0002] There are two main types of concrete 3D printing: extrusion and scraper. The process of extrusion 3D printing concrete is to extrude the concrete slurry from the mixing hopper according to the path designed by the software model, and stack it layer by layer on a platform covered with supports, and finally produce a complex-shaped structural part.

[0003] At present, this process has at least the following problems: 1. When the concrete structure is too large or too high, manual sanding and sand removal are dangerous, and the operator may accidentally fall into the quicksand or damage the unhardened concrete slurry; 2. After the concrete structure is printed, it must go through the curing process to obtain a solid and safe finished product, that is, the 3D printed concrete must be placed in a constant temperature and humidity environment to improve the final strength. Especially in a low temperature and dry environment, sand support alone does not have the function of regulating the curing temperature and humidity.

[0004] In view of the problems existing in the existing 3D printing concrete forming technology, a device with both support and maintenance functions for 3D printing concrete and a working method thereof are provided. Summary of the invention

[0005] Based on the above technical problem that concrete structural parts must go through a curing process after printing to obtain a solid and safe finished product, a support and curing device for 3D printed concrete and a working method thereof are provided. The present invention combines two 3D printing methods, extrusion type and scraper type, and designs an alternating stacking process of concrete extrusion and support paving to meet the intelligent and large-scale production of large and complex-shaped concrete components. At the same time, through the addition of microbial systems and insulation material components and the design of enclosure components, the deficiency of the lack of curing function of the support particles is improved, which promotes the performance and construction technology of 3D printed concrete.

[0006] The technical means adopted by the present invention are as follows:

[0007] A support and maintenance device for 3D printed concrete, comprising:

[0008] Gantry bracket: used to provide installation foundation and rigid support;

[0009] Mixing and discharging device: used for mixing and conveying concrete materials fed into the hopper, with a filling port and a heating plate attached to the outer wall of the hopper;

[0010] Concrete extrusion die: connected to the mixing and discharging device, used to extrude concrete materials for 3D printing;

[0011] Particle conveying device: installed on the cross beam of the gantry support, facing away from the stirring and discharging device, used for conveying the supporting mixture, including air blowing conveying and screw conveying;

[0012] Material storage and laying device: It is arranged side by side at the lower end of the particle conveying device, and uses a distance sensing switch to fill the supporting mixture into the empty space after each layer of concrete is squeezed out;

[0013] Plug-in splicing enclosure and plug-in fixed base: The plug-in splicing enclosure surrounds the printing area to construct a maintenance space, and is composed of a plurality of plug-in splicing structural parts; a unloading plug is provided on the bottom splicing structural part, and the plug-in fixed base is used to fix the splicing enclosure.

[0014] Furthermore, the particle conveying device includes a blowing conveying pipeline, in which a screw is provided for forcing the stirring support mixture to move forward in one direction and fill it into the material storage and laying device at the lower end. Both ends of the blowing conveying pipeline are respectively provided with blowing and suction ports for recovering excess support mixture.

[0015] Furthermore, the material storage laying device includes a storage barrel arranged below the particle conveying device, and the storage barrel includes a plurality of independent barrels separated by partitions. The bottom of each storage barrel is equipped with a distance sensing switch or a dust suction hose, and the dust suction hose is a telescopic suspension structure.

[0016] Furthermore, the stirring and discharging device includes a stirring hopper and a discharge straight pipe. The stirring hopper is shaped like a bucket-shaped container with a larger opening at the top and a smaller opening at the bottom. A stirring blade and a scraper are arranged inside the stirring hopper. The outer wall of the stirring hopper is equipped with a heating blade. The lower end opening of the discharge straight pipe is connected to a concrete extrusion die, and the outer wall of the discharge straight pipe is equipped with a heating blade.

[0017] Furthermore, the gantry structure includes two longitudinal columns and a transverse beam firmly connected, the two longitudinal columns are vertically fixed to the bottom plane, and the transverse beam is horizontally erected on the top of the two longitudinal columns to form a stable gate-shaped structure;

[0018] The bottom of the longitudinal column includes a plurality of support legs distributed in a triangular shape, a plurality of movable pulleys are arranged below the support legs, the plurality of movable pulleys slide in the track, and fixed wedges are respectively arranged at both ends of the plurality of movable slide rails.

[0019] The present invention also provides a working method of a support and maintenance device for 3D printing concrete, comprising:

[0020] In the semi-enclosed space of the plug-in splicing enclosure, after the concrete is transported and extruded to print a layer, the particle conveying device spreads the supporting mixture to the empty space, keeping it flush with the height of each layer of concrete, and stacking them layer by layer alternately until the concrete and mixture fill the plug-in splicing enclosure, and the top layer and surrounding of the enclosure can be covered with plastic film to form a fully enclosed curing space;

[0021] After curing is completed, the support mixture is recovered through a negative pressure generating device and multiple delivery pipes;

[0022] The conveying pipe is respectively connected to the unloading plug of the spliced ​​enclosure and the blowing and suction port of the particle conveying device; the negative pressure generating device is turned on, the mixture is sucked into the large storage bin through the plug and the dust suction hose, and the mixture is dried and the consumable materials are filled.

[0023] Furthermore, the weight proportions of the mixture components include 500-1000 parts of sand or shell powder, 5-50 parts of straw or corn cobs, 1-5 parts of Bacillus, 2-20 parts of starch or cellulose, 2-20 parts of urea or dry manure, and 100-500 parts of vermiculite or perlite.

[0024] Furthermore, the particle size of the sand or shell powder is in the range of 2-20 mm.

[0025] Furthermore, the length of the straw or corn cob ranges from 5 to 30 mm.

[0026] Furthermore, the vermiculite or perlite has a particle size range of 1-10 mm.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] Improve the safety of construction operations: Use distance sensing technology to automatically level the empty space left after concrete extrusion by sweeping. At the same time, use negative pressure vacuuming and supporting devices to achieve efficient recovery of concrete supports, effectively avoiding the construction risks faced by operators in quicksand environments.

[0029] Meet the formability of special-shaped components: Use plug-in splicing enclosures and base plates to build a stable and closed stacking area, combined with concrete extrusion printing and precise laying of supports to solve the forming accuracy problem of large or complex concrete components.

[0030] Strengthen the comprehensive performance of concrete: By coordinating the particle support materials, temperature and humidity regulating materials, and thermal insulation and moisture retaining materials of 3D printed concrete, ideal curing conditions can be provided for concrete components even in a low-temperature and dry environment, thereby comprehensively improving the performance of the components.

[0031] Practice the concept of environmental protection and low cost: the selected support and maintenance materials are derived from agricultural waste, low-cost products, natural environmental protection or recyclable materials, promoting the resource recycling and sustainable development of auxiliary consumables. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is a schematic diagram of the structure of the device in the present invention.

[0034] Figure 2 It is a top view of the device structure in the present invention.

[0035] Figure 3 It is a schematic diagram of the plug-in and splicing enclosure in the present invention.

[0036] Figure 4 It is a schematic diagram of the connectable structural parts in the present invention.

[0037] Figure 5 It is a schematic diagram of the particle conveying device in the present invention.

[0038] Figure 6 It is the front view of the stirring and discharging device in the present invention.

[0039] Figure 7 It is the rear view of the stirring and discharging device in the present invention.

[0040] Figure 8 It is a side view of the device structure in the present invention.

[0041] Fig. 9 This is a bar chart comparing the temperature changes of concrete in an open environment, a sand-supported environment, and a curing material-supported environment.

[0042] Fig.10 The bar graph is a comparison of the moisture changes of concrete in an open environment, a sand-supported environment, and a curing material-supported environment.

[0043] In the figure: 1. Gantry bracket; 11. Moving pulley; 12. Slide rail; 13. Fixed wedge; 2. Particle conveying device; 21. Blowing conveying pipeline; 22. Screw; 23. Blowing and suction port; 24. Storage barrel; 25. Distance sensor switch; 26. Dust suction hose; 3. Mixing and discharging device; 31. Mixing hopper; 32. Concrete extrusion die; 4. Plug-in and splicing enclosure; 41. Splicing structural parts; 42. Discharge plug; 5. Plug-in and fixed base. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0048] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] like Figure 1-10 As shown, the present invention provides a support and maintenance device for 3D printing concrete, comprising:

[0051] The gantry bracket 1, as the basic support frame of the whole device, is formed by two longitudinal columns and a transverse beam firmly connected. The two longitudinal columns are vertically fixed to the bottom plane, and the transverse beam is horizontally erected on the top of the two longitudinal columns to form a stable gate-shaped structure, which provides an installation foundation and rigid support for other components, ensuring the stability and accuracy of the overall structure during the 3D printing process. The material of the gantry structure is made of high-strength stainless steel, which is heat-treated to enhance its mechanical properties, and the surface is anti-corrosion treated to extend its service life;

[0052] The bottom of the longitudinal column includes a plurality of support legs distributed in a triangular shape, and a plurality of movable pulleys 11 are arranged under the support legs. The plurality of movable pulleys 11 slide in the track, and the pulleys and slide rails 12 cooperate to realize the movement, positioning or adjustment of the gantry components, which is convenient for fixed-point and continuous operation. Fixed wedges 13 are respectively arranged at both ends of the plurality of movable slide rails 12.

[0053] The plug-in splicing enclosure 4 is an enclosure structure formed by plugging in and out a plurality of splicing structural members 41, and is used to surround the working area of ​​3D printing concrete to isolate, protect or limit the working space, and has the functions of sealing and heat preservation and moisture retention.

[0054] The plug-in fixed base 5 is a special base for installing the plug-in splicing enclosure 4, which provides stable support and fixation for the device and is convenient for moving or replacing when necessary.

[0055] The particle conveying device 2 is installed on the crossbeam of the gantry support 1, including air blowing conveying and screw 22 conveying, and is a device dedicated to conveying granular support mixtures. Its conveying mode integrates two modes: one-way air blowing conveying and screw 22 stirring conveying. Shell powder or sand particles and concrete curing additives used to support concrete are conveyed from a large storage bin at one end to a large number of small storage barrels 24 where supports are to be laid, and excess materials are blown to a large storage bin at the other end and recycled.

[0056] The particle conveying device 2 includes a blowing conveying pipeline 21, in which a screw 22 is arranged, which is used to force the stirring support mixture to move forward in one direction and fill it into the storage and laying device at the lower end, and blowing and suction ports 23 are respectively arranged at both ends of the blowing conveying pipeline 21, which are used to recover the excess support mixture. The material is conveyed along the axial direction of the screw 22 through the friction between the spiral blades on the screw 22 and the material, which is used to force the conveying of powdery, granular or viscous support concrete mixture.

[0057] The material storage and laying device includes a storage barrel 24 arranged below the particle conveying device 2, which is a container for storing a mixture of supporting concrete. The number of installations of the storage barrel 24 and the size of the discharge port are set according to the size of the enclosure space and the printing accuracy of the concrete. The storage barrel 24 is composed of a plurality of independent barrels separated by partitions. The bottom of each dividing barrel is equipped with a distance sensing switch 25 or a dust suction hose 26. The distance sensing switch 25 can sense the distance between the extruded concrete and itself. When the concrete approaches or leaves a certain distance, the switch triggers the start and stop operation of the storage barrel 24 to realize the laying of the supporting mixture and keep the filling height of each layer consistent. The dust suction hose 26 is a telescopic suspension structure, which serves to suck out the supporting mixture after the concrete curing is completed. The dust removal hose has the necessary wear resistance and telescopic fixation.

[0058] The stirring and discharging device 3 includes a stirring hopper 31 and a discharging straight pipe. The stirring hopper 31 is in the shape of a bucket-shaped container with a large upper opening and a small lower opening. A stirring blade and a scraper are arranged inside the stirring hopper 31, and a heating blade is attached to the outer wall. The lower end opening of the discharging straight pipe is connected to the concrete extrusion die 32, and the outer wall of the discharging straight pipe can also be equipped with a heating blade. It is the outlet part where concrete and other materials are extruded, and its shape and size can be set and replaced as needed. The main function is to stir and mix concrete and other materials again and meet the rheological extrusion state to meet the material supply demand in the 3D printing process.

[0059] The mixing and discharging device 3 and the material storage and laying device respectively control the extrusion printing path and the sweeping distance sensing switch 25 through the model slicing software, and output the concrete and the support alternately to ensure that the stacking height of the two materials in each layer is consistent.

[0060] The present invention also provides a working method of a support and maintenance device for 3D printing concrete, comprising:

[0061] In the semi-enclosed space of the plug-in splicing enclosure 4, after the concrete is transported and extruded to print a layer, the particle conveying device 2 spreads the supporting mixture to the vacant space, keeping it flush with the height of each layer of concrete, and stacking them layer by layer alternately until the concrete and the mixture fill the plug-in splicing enclosure 4, and the top layer and the surrounding of the enclosure can be covered with a plastic film to form a fully enclosed curing space;

[0062] After curing is completed, the support mixture is recovered through a negative pressure generating device and multiple delivery pipes;

[0063] The conveying pipe is respectively connected to the discharge plug 42 of the spliced ​​enclosure and the blowing and suction port 23 of the particle conveying device 2; the negative pressure generating device is turned on, and the mixture is sucked into the large storage bin through the plug and the dust suction hose 26, and the mixture is dried and the consumable materials are filled.

[0064] The components (by weight) of the above mixture include 500-1000 parts of inorganic materials such as sand or shell powder, wherein the particle size ranges from 2 to 20 mm; 5-50 parts of plant fibers such as straw or corn cobs, wherein the length ranges from 5 to 30 mm; 1-5 parts of harmless microorganisms such as Bacillus; 2-20 parts of sugars such as starch or cellulose; 2-20 parts of urea or dry feces; 100-500 parts of vermiculite or perlite, wherein the particle size ranges from 1 to 10 mm. The selection of raw materials and their proportions follow the principles of environmental safety, recyclability and low price cost.

[0065] Example 1

[0066] The mixture of this embodiment includes the following components in parts by weight: 1000 parts of shell powder (particle size 10 mm), 10 parts of straw (length 10 mm), 2 parts of Bacillus, 10 parts of cellulose, 5 parts of urea and 200 parts of vermiculite (particle size 5 mm).

[0067] The use of a mixture to cure concrete in this embodiment includes the following steps: mixing shell powder for support, Bacillus and its nutrients for temperature and humidity enhancement, and vermiculite for heat preservation, and transporting the mixture as a support mixture into a curing space to cure the concrete.

[0068] Example 2

[0069] The mixture of this example includes the following components by weight: 1000 parts of sand (particle size 10 mm), 10 parts of corn cobs (length 10 mm), 2 parts of Bacillus, 10 parts of starch, 5 parts of dry manure and 200 parts of perlite (particle size 5 mm). The curing steps of Example 1 are repeated.

[0070] Example 3

[0071] The mixture of this embodiment includes the following components in parts by weight: 1000 parts of shell powder (particle size 20 mm), 10 parts of straw (length 30 mm), 2 parts of Bacillus, 3 parts of cellulose, 1 part of urea and 200 parts of vermiculite (particle size 10 mm). The curing steps of Example 1 are repeated.

[0072] Example 4

[0073] The mixture of this embodiment includes the following components by weight: 500 parts of shell powder (particle size 10 mm), 20 parts of straw (length 10 mm), 1 part of Bacillus, 2 parts of cellulose, 2 parts of urea and 100 parts of vermiculite (particle size 5 mm). The curing steps of Example 1 are repeated.

[0074] Comparative Example

[0075] A transparent container was set up to put concrete and supports, and a temperature and humidity meter was placed inside the transparent container to observe the value changes. At the same time, the same temperature and humidity meter was set outside the container as a control. The temperature and humidity changes of the same concrete in the transparent container in an open environment, a sand support environment, and a sand support environment containing a curing mixture (abbreviated as "curing material") were observed. The results showed that within the same time interval, the temperature and humidity in the sand support environment and the curing material support environment were higher than those in the open environment, and the curing material support environment was significantly higher than the temperature and humidity in the sand support environment, and met the ideal curing environment of about 18°C ​​and 90% humidity in an outdoor environment of about 5°C and 35%.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A support and maintenance device for 3D printing concrete, characterized in that: include: Gantry bracket: used to provide installation foundation and rigid support; Mixing and discharging device: used for mixing and conveying concrete materials fed into the hopper, with a filling port and a heating plate attached to the outer wall of the hopper; Concrete extrusion die: connected to the mixing and discharging device, used to extrude concrete materials for 3D printing; Particle conveying device: installed on the cross beam of the gantry support, facing away from the stirring and discharging device, used for conveying the supporting mixture, including air blowing conveying and screw conveying; Material storage and laying device: It is arranged side by side at the lower end of the particle conveying device, and uses a distance sensing switch to fill the supporting mixture into the empty space after each layer of concrete is squeezed out; Plug-in splicing enclosure and plug-in fixed base: The plug-in splicing enclosure surrounds the printing area to construct a maintenance space, and is composed of a plurality of plug-in splicing structural parts; a unloading plug is provided on the bottom splicing structural part, and the plug-in fixed base is used to fix the splicing enclosure.

2. The support and maintenance device for 3D printing concrete according to claim 1, characterized in that: The particle conveying device includes a blowing conveying pipeline, in which a screw is arranged for forcing the stirring support mixture to move forward in one direction and fill it into the storage and laying device at the lower end. Both ends of the blowing conveying pipeline are respectively provided with blowing and suction ports for recovering excess support mixture.

3. The support and maintenance device for 3D printing concrete according to claim 1, characterized in that: The material storage laying device includes a storage barrel arranged below the particle conveying device, and the storage barrel includes a plurality of independent barrels separated by partitions. The bottom of each storage barrel is equipped with a distance sensing switch or a dust suction hose, and the dust suction hose is a telescopic suspension structure.

4. The support and maintenance device for 3D printing concrete according to claim 1, characterized in that: The stirring and discharging device includes a stirring hopper and a discharging straight pipe. The stirring hopper is in the shape of a bucket-shaped container with a large upper opening and a small lower opening. A stirring blade and a scraper are arranged inside the stirring hopper. The outer wall of the stirring hopper is equipped with a heating blade. The lower end opening of the discharging straight pipe is connected to a concrete extrusion die, and the outer wall of the discharging straight pipe is equipped with a heating blade.

5. The support and maintenance device for 3D printing concrete according to claim 1, characterized in that: The gantry support comprises two longitudinal columns and a transverse beam which are firmly connected, the two longitudinal columns are vertically fixed to the bottom plane, and the transverse beam is horizontally erected on the top of the two longitudinal columns to form a stable gate-shaped structure; The bottom of the longitudinal column includes a plurality of support legs distributed in a triangular shape, a plurality of movable pulleys are arranged below the support legs, the plurality of movable pulleys slide in the track, and fixed wedges are respectively arranged at both ends of the plurality of movable slide rails.

6. A working method of a support and curing device for 3D printing concrete, based on the support and curing device for 3D printing concrete according to any one of claims 1 to 5, characterized in that: include: In the semi-enclosed space of the plug-in splicing enclosure, after the concrete is transported and extruded to print a layer, the particle conveying device spreads the supporting mixture to the empty space, keeping it flush with the height of each layer of concrete, and stacking them layer by layer alternately until the concrete and mixture fill the plug-in splicing enclosure, and the top layer and surrounding of the enclosure can be covered with plastic film to form a fully enclosed curing space; After curing is completed, the support mixture is recovered through a negative pressure generating device and multiple delivery pipes; The conveying pipe is respectively connected to the unloading plug of the spliced ​​enclosure and the blowing and suction port of the particle conveying device; the negative pressure generating device is turned on, the mixture is sucked into the large storage bin through the plug and the dust suction hose, and the mixture is dried and the consumable materials are filled.

7. The working method of the support and maintenance device for 3D printing concrete according to claim 6, characterized in that: The weight proportions of the mixture components include 500-1000 parts of sand or shell powder, 5-50 parts of straw or corn cobs, 1-5 parts of bacillus, 2-20 parts of starch or cellulose, 2-20 parts of urea or dry manure, and 100-500 parts of vermiculite or perlite.

8. The working method of the support and maintenance device for 3D printing concrete according to claim 7, characterized in that: The particle size of the sand or shell powder is in the range of 2-20 mm.

9. The working method of the support and maintenance device for 3D printing concrete according to claim 7, characterized in that: The length of the straw or corn cob ranges from 5 to 30 mm.

10. The working method of the support and maintenance device for 3D printing concrete according to claim 7, characterized in that: The particle size of the vermiculite or perlite is in the range of 1-10 mm.

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