A 3D printing device based on construction waste recycled aggregate and a construction method

Abstract

The application discloses a kind of 3D printing equipment and construction method based on construction waste recycled aggregate, belong to building 3D printing technical field.The technical scheme for the application is, a kind of 3D printing equipment based on construction waste recycled aggregate, including vertical lifting mechanism, vertical lifting mechanism middle part has the accommodating area of accommodating reinforcing mesh piece, vertical lifting mechanism is slidably connected with annular frame body, annular frame body top is equipped with annular storage mechanism, annular frame body below is equipped with annular slide rail, and printing assembly is slidably connected on annular slide rail;The application is controlled by vertical lifting mechanism and annular slide rail in cooperation, and it is realized that reinforcing mesh piece inside and outside accurate printing and automatic material supply, solve the technical problem that uneven protective layer in traditional printing, material supply efficiency is low, with the remarkable advantage of improving structural strength, optimizing resource utilization, improving construction efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building 3D printing, and particularly relates to a 3D printing equipment based on building waste recycled aggregate and a construction method. BACKGROUND

[0002] At present, the modern construction industry is booming, and the amount of building waste is increasing. According to relevant data, the total amount of building waste discharged in China annually exceeds 1.5 billion tons, with an annual growth rate of 8%. By 2020, it has exceeded 3 billion tons, accounting for about 40% of the total amount of urban waste. However, its resource utilization rate is less than 10%. A large amount of building waste is not effectively treated and is often transported to the suburbs or the outskirts of the city for simple landfill or open-air storage, which not only occupies a large amount of valuable land resources, but also causes serious pollution to the ecological environment.

[0003] At the same time, with the continuous expansion of the construction industry, the demand for sand and gravel aggregate has increased dramatically. For a long time, due to the relatively easy access and low price of sand and gravel aggregate, people have been indiscriminately mining, leading to a series of serious ecological problems such as resource depletion, landslides, and river bed changes. The natural environment has been severely damaged. Under this background, processing building waste into recycled aggregate and utilizing it has become a key measure to save resources, protect the environment, and promote the sustainable development of the construction industry.

[0004] 3D printing technology, as an extremely innovative manufacturing technology, has gradually emerged in the application of the construction field in recent years. It is based on digital model files and builds three-dimensional objects by layering printing of adhesive materials. Compared with traditional manufacturing technology, it has the advantages of "mold removal, waste reduction, and inventory reduction", which can effectively optimize the building structure, save materials and energy, greatly improve the building manufacturing efficiency, and realize the innovative concept of "design-guided manufacturing".

[0005] However, the existing building 3D printing technology still has many technical bottlenecks in the application process. First, in the printing of reinforced steel structures, traditional equipment cannot realize the organic combination of steel mesh and printing materials, resulting in insufficient strength of the printed structure. Especially in the printing process of concrete columns, it is difficult to ensure the uniformity and integrity of the protective layer around the steel mesh, which seriously affects the mechanical properties and durability of the component. Secondly, the material supply system of the existing equipment lacks intelligence, and cannot realize precise automatic material supply according to the printing progress, which may cause printing interruption. In addition, the curing process after printing lacks effective real-time curing means, which cannot timely cure and solidify the printed structure, affecting the final quality. These problems seriously restrict the popularization and application of building 3D printing technology in engineering practice. SUMMARY

[0006] The application provides a 3D printing device based on construction waste recycled aggregate and a construction method to solve at least one of the above technical problems.

[0007] The technical scheme adopted by the application is:

[0008] A 3D printing device based on construction waste recycled aggregate, comprising a vertical lifting mechanism, wherein the vertical lifting mechanism has a containing area for containing a reinforcing mesh in the middle part, an annular frame main body reinforcing positioning hole is slidably connected to the vertical lifting mechanism, an annular storage mechanism is arranged above the annular frame main body reinforcing positioning hole, an annular slide rail reinforcing positioning hole is arranged below the annular frame main body reinforcing positioning hole, a printing assembly is slidably connected to the annular slide rail reinforcing positioning hole, a plurality of discharge port reinforcing positioning holes are arranged at the bottom of the storage mechanism, an electromagnetic valve is arranged above the discharge port reinforcing positioning hole, and the plurality of discharge port reinforcing positioning holes penetrate through the annular slide rail reinforcing positioning hole and are arranged at equal intervals along the annular slide rail reinforcing positioning hole; when the printing assembly slides to the discharge port reinforcing positioning hole, the electromagnetic valve is opened to supply material to the printing assembly; and the output end of the printing assembly is telescopically arranged so as to have a first position outside the reinforcing mesh and a second position inside the reinforcing mesh.

[0009] Further, a control system is arranged to control the opening and closing of the electromagnetic valve to realize automatic material supply of the printing assembly, and the control system controls the automatic switching of the output end of the printing assembly between the first position and the second position.

[0010] Further, the application further provides that the printing assembly is initially in the first position and slides along the annular slide rail reinforcing positioning hole in the circumferential direction to print a protective layer outside the reinforcing mesh; when the height of the protective layer reaches a threshold value, the printing assembly is switched from the first position to the second position to pour material into the reinforcing mesh.

[0011] Further, the application further provides that the printing assembly comprises a sliding part reinforcing positioning hole which is slidably connected to the annular slide rail reinforcing positioning hole, a containing cavity reinforcing positioning hole for containing material is arranged at the upper end of the sliding part reinforcing positioning hole, a discharge pipe reinforcing positioning hole is rotatably connected to the lower end of the sliding part reinforcing positioning hole, a first telescopic cylinder reinforcing positioning hole is rotatably connected to the side wall of the sliding part reinforcing positioning hole, the telescopic end of the first telescopic cylinder reinforcing positioning hole is rotatably connected to the discharge pipe reinforcing positioning hole, a telescopic pipe reinforcing positioning hole is slidably connected to the lower end of the discharge pipe reinforcing positioning hole, a second telescopic cylinder reinforcing positioning hole is arranged between the telescopic pipe reinforcing positioning hole and the discharge pipe reinforcing positioning hole, and a material outlet reinforcing positioning hole is arranged at the lower end of the telescopic pipe reinforcing positioning hole.

[0012] Further, the application also proposes that the accommodating cavity steel positioning hole is provided with a material sensor for detecting the weight of the internal material, the sliding part steel positioning hole is provided with a material discharge amount N in the sliding stroke between two adjacent material discharge port steel positioning holes, the material sensor detects the material storage M in the accommodating cavity steel positioning hole, and the maximum capacity of the accommodating cavity steel positioning hole is 4-5N. When M=N, the accommodating cavity steel positioning hole moves to the next material discharge port steel positioning hole for material replenishment.

[0013] Further, the application also proposes that the vertical lifting mechanism is further provided with a jet frame steel positioning hole in sliding connection with the vertical lifting mechanism, the jet frame steel positioning hole is located below the annular frame body steel positioning hole, and is used for curing and solidifying the protective layer printed by the printing assembly. The jet frame steel positioning hole is internally provided with an air flow cavity, the inner side wall of the jet frame steel positioning hole is provided with a jet hole, the outer side wall of the jet frame steel positioning hole is provided with a gas guide pipe steel positioning hole for connecting the output end of an external curing steam supply device, and the gas guide pipe steel positioning hole is provided with an electric control valve.

[0014] Further, the application also proposes that the vertical lifting assembly comprises a lifting guide rail steel positioning hole, the side wall of the annular frame body steel positioning hole is provided with a first guide sliding piece in sliding cooperation with the lifting guide rail steel positioning hole, the side wall of the jet frame steel positioning hole is provided with a second guide sliding piece steel positioning hole in sliding cooperation with the lifting guide rail steel positioning hole, and the lifting guide rail steel positioning hole is provided with a driving mechanism for respectively driving the annular frame body steel positioning hole and the jet frame steel positioning hole to ascend and descend along the lifting guide rail steel positioning hole.

[0015] Further, the application also proposes that the annular storage mechanism comprises an annular groove steel positioning hole, the side wall of the annular groove steel positioning hole is provided with a material replenishing pipe steel positioning hole, and the top of the annular groove steel positioning hole is detachably connected with a cover plate steel positioning hole.

[0016] Further, the application also proposes that the lifting guide rail steel positioning hole is slidably connected with a vertical steel limiting plate steel positioning hole at the upper end, the vertical steel limiting plate steel positioning hole is provided with a plurality of steel positioning hole steel positioning holes, and the lifting guide rail steel positioning hole is vertically and spacedly fixedly connected with a plurality of reinforcing cross beams steel positioning holes.

[0017] A 3D printing construction method based on construction waste recycled aggregate, specifically comprising the following steps:

[0018] S1, hoisting and positioning the vertical lifting mechanism according to the position of the steel mesh piece;

[0019] S2, inputting the concrete column size and model parameters to the control system, and pouring the pouring material into the annular groove steel positioning hole;

[0020] S3, the control system controls the sliding part steel positioning hole to slide to the nearest discharge port steel positioning hole directly below, and controls the electromagnetic valve of the discharge port steel positioning hole to open to fill the material into the containing cavity steel positioning hole, and after filling is completed, the electromagnetic valve is closed;

[0021] S4, the control system controls the output end of the printing assembly to be in the first position, the sliding part steel positioning hole slides along the annular slide rail steel positioning hole in the circumferential direction and performs the discharge printing action, the material is printed layer by layer along the outside of the reinforcement mesh piece to print the outer protective layer of the concrete column, and the control system controls the annular frame main body steel positioning hole to rise with the increase of the height of the protective layer;

[0022] S5, the jet frame steel positioning hole is connected with the output end of the external maintenance steam supply device through the gas guide pipe steel positioning hole, the control system controls the electric control valve to open, and the jet hole of the jet frame steel positioning hole sprays the appropriate temperature steam to maintain the protective layer;

[0023] S6, the sliding part steel positioning hole slides below any discharge port steel positioning hole, the control system controls the electromagnetic valve of the discharge port steel positioning hole to open, and the control system controls the output end of the printing assembly to be in the second position to pour the material into the internal space of the protective layer;

[0024] S7, after the printing height reaches the preset value, the construction of a single concrete column is completed, and the vertical lifting mechanism is lifted to the next construction area.

[0025] Further, in step S5, a jet time threshold is set, and after the threshold is reached, the control system controls the jet frame steel positioning hole to rise to jet and maintain the upper protective layer.

[0026] Due to the adoption of the above technical solutions, the application has the following beneficial effects:

[0027] 1. The application provides a stable installation space for the reinforcement mesh piece through the containing area of the vertical lifting mechanism; the cooperation of the annular material storage mechanism, the annular slide rail steel positioning hole and the printing assembly realizes automatic material supply; and the application of the control system realizes automatic operation of the equipment, thereby effectively solving the above problems.

[0028] Through the above technical solutions, the application realizes accurate matching of the reinforcement mesh piece positioning and the printing path, guarantees the uniformity and integrity of the concrete protective layer. The automatic material supply system eliminates the risk of printing interruption, and seamlessly connects the outer layer protection printing and the internal filling process. The double-position working mode of the telescopic printing assembly effectively solves the problem of synchronous forming of the inner and outer layers of the structure with reinforcement, and improves the structural integrity and construction efficiency.

[0029] 2. The scheme triggers an automatic switching mechanism by setting a height threshold, so that the printing assembly completes the outer protective layer printing and internal material pouring in a single cycle, avoiding errors caused by multiple positioning, and ensuring the uniformity of the protective layer thickness through a closed-loop control system. The continuous automatic printing of the inner and outer layers of the reinforcement mesh is realized, solving the problem of insufficient bonding strength caused by the separate pouring of the protective layer and the internal structure in the traditional process. The position switching mechanism triggered by the height threshold ensures that the protective layer reaches the designed thickness and immediately enters the internal pouring stage, avoiding material waste or structural defects caused by human judgment errors. In addition, the coordinated control of the circumferential sliding and position switching significantly improves the forming efficiency of complex reinforcement structures, especially suitable for batch construction of large-diameter concrete columns.

[0030] 3. The scheme realizes the dual adjustment of the material outlet direction and height through the rotation of the reinforcement positioning hole of the discharge pipe and the telescopic pipe reinforcement positioning hole structure, solving the technical problem of synchronous pouring of the inner and outer layers of the reinforcement mesh. The application realizes the precise positioning and pouring of the printing assembly in the inner and outer space of the reinforcement mesh, ensuring the continuous forming of the protective layer and the internal structure. The height-adjustable feature of the material outlet reinforcement positioning hole avoids the blockage of the outlet caused by the change of the printing layer height, the rotation adjustment mechanism improves the adaptability to reinforcement meshes of different diameters, and the nested telescopic pipe reinforcement positioning hole structure effectively controls the material falling impact force to prevent the deformation of the poured structure.

[0031] 4. By real-time detection of inventory and dynamic adjustment of replenishment timing combined with stroke displacement, the automatic coordination of replenishment operation and printing process is realized, effectively solving the technical defects of insufficient or excessive replenishment. The application can automatically maintain the material inventory in the reinforcement positioning hole of the containing cavity within a reasonable range during printing, avoiding printing interruption or uneven protective layer thickness caused by insufficient replenishment, while reducing the frequency of manual intervention and improving the continuous operation stability of construction waste recycled aggregates in 3D printing applications.

[0032] 5. The scheme realizes automatic curing immediately after the printing layer is formed by combining the liftable annular jet frame reinforcement positioning hole with the steam curing technology, the steam jet angle and flow are controllable, effectively improving the curing uniformity and efficiency. The application realizes the synchronization of printing structure and curing process, solves the problem of concrete cracking caused by curing lag in traditional 3D printing, the circumferential uniform steam distribution of the annular jet frame reinforcement positioning hole avoids the blind area of manual curing, the electric control valve accurately adjusts the steam parameters to adapt to the curing needs of different material ratios, the overall structure is compact and highly integrated with the printing equipment, significantly improving the forming quality and construction efficiency of building components.

[0033] 6. The scheme is designed by a split drive mechanism, so that the lifting action of the annular frame body reinforcement positioning hole and the jet frame reinforcement positioning hole is completely decoupled, avoiding the mutual interference between the printing operation and the maintenance operation, and eliminating the unstable problem of the equipment structure caused by synchronous lifting. The independent height control of the printing frame and the maintenance frame is realized, ensuring that the material replenishment and steam curing can be operated in parallel during the printing process. The precise positioning of the annular frame body reinforcement positioning hole in the vertical direction ensures the accuracy of the continuous stacking of the protective layer, and the independent lifting of the jet frame reinforcement positioning hole enables it to timely maintain the printed layer of any height, effectively solving the problem of maintenance lag affecting the concrete strength in the traditional equipment. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The structural schematic diagram of the embodiment of the present application is shown in the figure;

[0035] Figure 2 The structural schematic diagram of the jet frame in the embodiment of the present application is shown in the figure;

[0036] Figure 3 The structural schematic diagram of the annular frame body in the embodiment of the present application is shown in the figure;

[0037] Figure 4 The structural schematic diagram of the annular frame body in the embodiment of the present application is shown in the figure;

[0038] Figure 5 The structural schematic diagram of the printing assembly in the embodiment of the present application is shown in the figure.

[0039] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application.

[0040] In the drawings:

[0041] 1, lifting guide rail; 11, reinforcing cross beam; 2, annular frame body; 21, annular groove; 211, cover plate; 22, material replenishing pipe; 3, annular slide rail; 31, material discharging port; 4, sliding part; 41, accommodating cavity; 42, material discharging pipe; 43, telescopic pipe; 44, first telescopic cylinder; 45, second telescopic cylinder; 46, material outlet; 5, jet frame; 51, second guide slide; 52, gas guide pipe; 6, vertical steel reinforcement limiting plate; 61, steel reinforcement positioning hole. DETAILED DESCRIPTION

[0042] In order to more clearly explain the overall concept of the present application, the following will be described in detail with reference to the drawings.

[0043] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details and other implementations can be employed. Therefore, the scope of the present application encompass not only the specific embodiments described in the specification, but also other embodiments employing equivalents or similar arrangements.

[0044] In addition, in the description of the present application, it needs to be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0045] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like are to be broadly interpreted, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description referring to the terms "embodiment", "example", "one embodiment", "exemplary" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] Reference Figures 1 to 3The utility model relates to a kind of 3D printing equipment based on construction waste recycled aggregate, including vertical lifting mechanism, vertical lifting mechanism middle part has the accommodating area of accommodating reinforcing mesh piece, vertical lifting mechanism upper slide connection has annular frame body 2, annular frame body 2 top is equipped with annular storage mechanism, annular frame body 2 below is equipped with annular slide rail 3, annular slide rail 3 upper slide connection has printing assembly, storage mechanism bottom is equipped with several discharge ports 31, discharge port 31 is equipped with electromagnetic valve, several discharge ports 31 pass through annular slide rail 3 and along annular slide rail 3 equidistant arrangement, printing assembly slides to discharge port 31, electromagnetic valve opens to supply material for printing assembly, the output end of printing assembly is telescopic to make it have first position located reinforcing mesh piece outside and second position located reinforcing mesh piece inside;It further includes control system, control system controls the opening or closing of electromagnetic valve to realize the automatic feeding of printing assembly, and control system controls the output end of printing assembly and automatically switches between first position and second position.

[0048] Wherein, vertical lifting mechanism is the supporting structure with lifting function, specifically can be realized using the combination of guide rail and driving motor, for bearing annular frame body 2 and realizing printing height adjustment.Annular frame body 2 specifically can be formed using steel structure welding, for supporting storage mechanism and slide rail system.Annular slide rail 3 is the annular track arranged below frame body, specifically can adopt aluminum alloy track structure with roller, for guiding the circumferential movement of printing assembly.Printing assembly output end telescopic setting refers to the position adjusting function of discharge device, specifically can adopt cylinder-driven telescopic pipe 43 structure, realizes the position switching of discharge port 31 inside and outside reinforcing mesh piece.

[0049] When equipment runs, reinforcing mesh piece is fixed in the middle part of vertical lifting mechanism, and annular frame body 2 adjusts printing height along guide rail.Lifting mechanism position signal opens feeding according to discharge port 31 electromagnetic valve during the movement of printing assembly along annular slide rail 3, to ensure the continuity of material supply.When reinforcing mesh piece outside protective layer needs to be printed, output end is retracted to first position to carry out outer layer material stacking;After reaching the set height, output end is extended to second position to insert reinforcing mesh piece to fill.Control system realizes layer-by-layer continuous printing by coordinating lifting mechanism movement and printing assembly position switching.

[0050] Traditional 3D printing equipment is difficult to realize the efficient integration of reinforcing mesh piece and printing material, and the material supply process depends on manual operation, which is low in efficiency.The utility model provides stable installation space for reinforcing mesh piece through the accommodating area design of vertical lifting mechanism;The cooperation of annular storage mechanism and annular slide rail 3, printing assembly realizes the automatic feeding of material;The application of control system realizes the automatic operation of equipment, effectively solves the above problems.

[0051] By the technical scheme, the present application realizes accurate matching of the reinforcement mesh positioning and the printing path, guarantees uniformity and integrity of the concrete protective layer. The automatic feeding system eliminates the risk of printing interruption, and makes the outer protective printing seamlessly connected with the internal filling process. The double-position working mode of the telescopic printing assembly effectively solves the problem of synchronous forming of the inner and outer layers of the reinforced structure, and improves the structural integrity and construction efficiency.

[0052] As a preferred embodiment of the present application, with reference to Figures 1-5 , the printing assembly is initially located at the first position and slides along the annular slide rail 3 in the circumferential direction to print the protective layer on the outer side of the reinforcement mesh. When the height of the protective layer reaches a threshold value, the printing assembly switches from the first position to the second position to pour the material into the interior of the reinforcement mesh.

[0053] The printing head of the printing assembly is located on the outer side of the reinforcement mesh in the initial working state, which can be realized by setting the initial coordinate position of the printing head, thereby ensuring the accuracy of the starting position of the protective layer printing. The circumferential sliding of the annular slide rail 3 refers to the circumferential movement of the printing assembly along the annular track, which can be realized by the engagement of the servo motor driven roller and the track, thereby ensuring the continuity and stability of the printing path. The height threshold of the protective layer refers to the pre-set critical value of the height of the protective layer, which can be monitored in real time by a displacement sensor or a visual recognition system or a height sensor, and the position switching instruction is triggered when the set value is reached.

[0054] The printing assembly is initially located at the first position, and under the instruction of the control system, it slides along the annular slide rail 3 at a speed of 0.5 m / s in the circumferential direction, while the material is extruded through the discharge pipe 42 to print the protective layer on the outer side of the reinforcement mesh layer by layer. During the printing process, the height sensor installed on the vertical lifting mechanism monitors the printing height of the protective layer in real time. When the height of the protective layer reaches the pre-set threshold value, the control system sends a signal to the telescopic cylinder of the printing assembly, so that the output end of the printing assembly switches from the first position to the second position. At this time, the telescopic pipe 43 extends into the interior of the reinforcement mesh, and the pouring of the material into the interior begins. Based on the overall architecture of the equipment, the height sensor feedbacks the height information of the protective layer in real time, and the control system controls the position switching of the output end of the printing assembly according to the pre-set threshold value, thereby realizing the orderly printing process of printing the protective layer first and then pouring the interior.

[0055] The printing assembly moves circumferentially along the annular slide rail 3 in the initial stage, and the material is output from the discharge port 31 and stacked layer by layer outside the reinforcement mesh to form a protective layer. When the displacement sensor detects that the height of the protective layer reaches the preset value, the control system sends a command to the first telescopic cylinder 44 to drive the discharge pipe 42 to overturn inward, while the second telescopic cylinder 45 pushes the telescopic pipe 43 to extend downward, so that the material outlet 46 enters the inside of the reinforcement mesh. At this time, the printing assembly continues to move along the slide rail, and the material is poured into the inside space of the reinforcement mesh to realize synchronous forming of the inner and outer layers. In this process, the annular frame body 2 is lifted synchronously with the printing height to ensure that the printing assembly is always within the effective working range.

[0056] The scheme triggers an automatic switching mechanism by a preset height threshold, so that the printing assembly completes the printing of the outer protective layer and the pouring of the internal material in a single cycle, avoiding errors caused by multiple positioning. At the same time, the closed-loop control system ensures the uniformity of the protective layer thickness. The scheme realizes continuous automatic printing of the inner and outer layers of the reinforcement mesh, and solves the problem of insufficient bonding strength caused by layered pouring of the protective layer and the internal structure in the traditional process. Through the position switching mechanism triggered by the height threshold, the protective layer is immediately transferred to the internal pouring stage after reaching the designed thickness, avoiding material waste or structural defects caused by human judgment errors. In addition, the coordinated control of circumferential sliding and position switching significantly improves the forming efficiency of complex reinforcement structures, especially suitable for batch construction of large-diameter concrete columns.

[0057] As a specific embodiment of the printing assembly in the present application, referring to Figures 3-5 The printing assembly includes a sliding part 4 that is in sliding cooperation with the annular slide rail 3, the sliding part 4 is provided with a containing cavity 41 for containing material at the upper end, the sliding part 4 is rotatably connected with a discharge pipe 42 at the lower end, the sliding part 4 is rotatably connected with a first telescopic cylinder 44 at the side wall, the telescopic end of the first telescopic cylinder 44 is rotatably connected with the discharge pipe 42, the discharge pipe 42 is slidably connected with a telescopic pipe 43 at the lower end, the telescopic pipe 43 and the discharge pipe 42 are provided with a second telescopic cylinder 45, and the telescopic pipe 43 is provided with a material outlet 46 at the lower end.

[0058] The sliding part 4 is a hollow cuboid structure, and the upper end of the sliding part 4 is provided with a containing cavity 41 for storing materials. The containing cavity 41 is internally provided with a material sensor, which can monitor the weight of the materials in the containing cavity 41 in real time. The lower end of the sliding part 4 is rotationally connected to a discharging pipe 42 through a rotating bearing, and the discharging pipe 42 can freely rotate within a certain angle range. A first telescopic cylinder 44 is installed on the side wall of the sliding part 4, and the telescopic end of the first telescopic cylinder 44 is rotationally connected to the middle part of the discharging pipe 42 through a hinge. Through the telescopic action of the first telescopic cylinder 44, the discharging pipe 42 can be rotated around the rotating bearing to adjust the discharging direction. A telescopic pipe 43 is slidably connected to the lower end of the discharging pipe 42, and a second telescopic cylinder 45 is arranged between the telescopic pipe 43 and the discharging pipe 42. The telescopic action of the second telescopic cylinder 45 can control the extension length of the telescopic pipe 43, so as to realize the switching of the output end of the printing assembly between the first position and the second position. The material outlet 46 at the lower end of the telescopic pipe 43 is designed in a conical shape, which can effectively control the extrusion speed and shape of the materials.

[0059] When the sliding part 4 moves along the annular slide rail 3, the materials in the containing cavity 41 enter the discharging pipe 42 through gravity. When it is necessary to adjust the discharging direction, the first telescopic cylinder 44 pushes the discharging pipe 42 to rotate around the hinge joint, so that the material outlet 46 is aligned with the outer side or the inner side area of the reinforcement mesh. The second telescopic cylinder 45 drives the telescopic pipe 43 to extend downward, so that the material outlet 46 reaches the predetermined height position. In the printing protection layer stage, the discharging pipe 42 is kept to be inclined outward at an angle, and the telescopic pipe 43 is in a fully retracted state. The materials are uniformly discharged along the outer side of the reinforcement mesh. When it is necessary to cast the internal structure, the first telescopic cylinder 44 is retracted to rotate the discharging pipe 42 inward, and at the same time, the second telescopic cylinder 45 pushes the telescopic pipe 43 to extend downward. The material outlet 46 penetrates into the internal reinforcement mesh for casting.

[0060] The present scheme realizes the dual adjustment of the discharging direction and height through the rotation of the discharging pipe 42 and the telescopic pipe 43, solves the technical problem of synchronous casting of the internal and external reinforcement mesh, realizes the accurate positioning and casting of the printing assembly in the internal and external space of the reinforcement mesh, and ensures the continuous forming of the protection layer and the internal structure. The height-adjustable feature of the material outlet 46 avoids the blockage of the discharging port caused by the change of the printing layer height. The rotation adjustment mechanism improves the adaptability to reinforcement meshes with different diameters. The nested telescopic pipe 43 structure effectively controls the falling impact force of the materials, and prevents the deformation of the cast structure.

[0061] Preferably, the containing cavity 41 is internally provided with a material sensor for detecting the weight of the internal materials. The discharging amount of the materials in the sliding stroke of the sliding part 4 between two adjacent discharging ports 31 is N, the material sensor detects that the storage amount of the materials in the containing cavity 41 is M, and the maximum capacity of the containing cavity 41 is 4-5N. When M=N, the containing cavity 41 moves to the next discharging port 31 for material replenishment.

[0062] The material discharge N is determined by testing and calculating the material discharge of the printing assembly during the sliding stroke between two adjacent discharge ports 31. The maximum capacity of the containing cavity 41 is set to 4.5N, i.e. 22.5kg. The material sensor is a high-precision weighing sensor that monitors the material inventory M in the containing cavity 41 in real time. When M decreases to N, the control system controls the sliding part 4 to move to the position directly below the next discharge port 31, opens the electromagnetic valve for material replenishment, and closes the electromagnetic valve when the replenishment amount reaches 90% of the maximum capacity. During the movement of the sliding part 4 along the annular slide rail 3 to perform the printing operation, the material sensor continuously monitors the real-time inventory in the containing cavity 41. When the inventory is detected to decrease to the single stroke discharge, the control system immediately drives the sliding part 4 to move to the position of the nearest discharge port 31 and opens the electromagnetic valve for replenishment. Since the maximum capacity of the containing cavity 41 is set to 4 to 5 times the single stroke discharge, it can avoid frequent replenishment causing printing interruption and prevent excessive replenishment causing cavity blockage or material hardening. After the replenishment is completed, the sliding part 4 continues to perform the printing operation of the subsequent stroke, forming a continuous printing-replenishment cycle.

[0063] The present scheme dynamically adjusts the replenishment timing by real-time detection of the inventory and combination of the stroke discharge, realizes the automatic cooperation of the replenishment operation and the printing process, and effectively solves the technical defects of insufficient or excessive replenishment. The present application can automatically maintain the material inventory in the containing cavity 41 within a reasonable range during printing, avoid printing interruption or uneven protective layer thickness caused by insufficient replenishment, reduce the frequency of manual intervention, and improve the continuous operation stability of construction waste recycled aggregate in 3D printing applications.

[0064] As another preferred embodiment of the present application, with reference to Figures 1-2 The jet frame 5 is slidably connected to the vertical lifting mechanism and is located below the annular frame body 2 for curing and solidifying the protective layer printed by the printing assembly. The jet frame 5 has an airflow cavity inside, the inner side wall of the jet frame 5 is provided with a jet hole, and the outer side wall of the jet frame 5 is provided with a gas conduit 52 connected to the output end of an external curing steam supply device. The gas conduit 52 is provided with an electrically controlled valve.

[0065] The air jet frame 5 is a ring-shaped structure body installed on the vertical lifting mechanism by sliding connection, which can be implemented by an aluminum alloy frame combined with a guide rail sliding block structure. The ring-shaped form matches the printing path and can be lifted synchronously with the printing height. The airflow cavity refers to a closed channel structure arranged inside the air jet frame 5, which can be implemented by a hollow ring-shaped cavity, used for uniformly distributing the curing gas and maintaining stable airflow pressure. The air jet hole refers to a gas outlet hole distributed along the inner side wall of the air jet frame 5, which can be implemented by an array of circular holes with a diameter of 2-5 mm. The hole axis direction is arranged to be inclined to the surface of the protective layer by 30-45 degrees, ensuring that the steam uniformly covers the surface of the printing layer. The gas conduit 52 refers to a pipeline assembly connecting the external steam generating device and the airflow cavity. The electric control valve refers to an electromagnetic regulating valve installed on the gas conduit 52, which can be implemented by a proportional electromagnetic valve. The steam flow and pressure are controlled by adjusting the opening degree.

[0066] When the printing assembly completes the protective layer stacking, the control system drives the air jet frame 5 to rise synchronously along the vertical lifting mechanism to the current printing layer height. The curing steam output by the external steam supply device is injected into the airflow cavity through the gas conduit 52 and uniformly sprayed onto the surface of the protective layer through the air jet hole. The electric control valve adjusts the steam output according to the preset curing parameters, and the ring-shaped structure of the air jet frame 5 ensures that the steam covers the concrete surface from all directions, avoiding local drying or over-wetting. In the vertical direction, the air jet frame 5 is lifted layer by layer with the printing height, realizing dynamic and continuous curing.

[0067] This scheme combines the liftable ring-shaped air jet frame 5 with the steam curing technology, realizes automatic curing immediately after the printing layer is formed, and the steam injection angle and flow are controllable, effectively improving the curing uniformity and efficiency. This application realizes the synchronization of printing structure and curing process, solves the problem of concrete cracking caused by curing lag in traditional 3D printing, and avoids the blind area existing in manual curing through the circumferential uniform steam distribution of the ring-shaped air jet frame 5. The electric control valve accurately adjusts the steam parameters to adapt to the curing needs of different material ratios. The overall structure is compact and highly integrated with the printing equipment, significantly improving the quality and efficiency of building component formation.

[0068] As a preferred embodiment of the vertical lifting assembly, referring to Figure 1 The vertical lifting assembly includes a lifting guide rail 1, a first guide sliding piece is arranged on the side wall of the ring-shaped frame body 2 and slidably matched with the lifting guide rail 1, a second guide sliding piece 51 is arranged on the side wall of the air jet frame 5 and slidably matched with the lifting guide rail 1, and a driving mechanism is arranged on the lifting guide rail 1 to drive the ring-shaped frame body 2 and the air jet frame 5 to ascend and descend along the lifting guide rail 1, respectively.

[0069] The lifting guide rail 1 is a vertical support structure for carrying the annular frame body 2 and the jet frame 5, which can be made of an I-shaped steel or an H-shaped steel, and a sliding groove or a guide strip is arranged on the surface of the lifting guide rail 1 to realize sliding fit. The first guide sliding member and the second guide sliding member 51 are sliding members respectively arranged on the side walls of the annular frame body 2 and the jet frame 5, which can be sliding blocks or rollers, and are embedded in the sliding groove of the lifting guide rail 1 to realize stable sliding. The driving mechanism is a power device for independently controlling the lifting of the annular frame body 2 and the jet frame 5, which can be a servo motor cooperating with a gear and rack transmission system or a hydraulic cylinder to realize independent lifting control of the two frames.

[0070] The lifting guide rail 1 is a vertical core support structure, and the first guide sliding member and the second guide sliding member 51 are respectively connected to the annular frame body 2 and the jet frame 5 in a sliding manner. The driving mechanism independently controls the lifting of the two frames, so that the annular frame body 2 can be lifted synchronously with the height of the protective layer during printing, and the jet frame 5 can be independently adjusted in height according to the maintenance requirements. For example, when the annular frame body 2 completes the printing of a layer of protective layer, the driving mechanism lifts it to the next printing height, and at this time, the jet frame 5 can be maintained at the original height to perform steam maintenance on the printed layer, and then lifted to the subsequent working position by the driving mechanism after the maintenance is completed.

[0071] The present scheme realizes the independent height control of the printing frame and the maintenance frame, and ensures that the material supplementing and steam maintenance can be operated in parallel during printing. The precise positioning of the annular frame body 2 in the vertical direction guarantees the precision of the continuous stacking of the protective layer, and the independent lifting of the jet frame 5 enables it to timely maintain the layer of any height that has been printed, effectively solving the problem of maintenance lag affecting the strength of concrete in the traditional equipment.

[0072] As a preferred example of the annular material storage mechanism, refer to Figure 1 、 Figure 3 and Figure 4, the annular storage mechanism comprises an annular groove 21, the sidewall of the annular groove 21 is provided with a feeding pipe 22, and a cover plate 211 is detachably connected to the top of the annular groove 21. The annular groove 21 is arranged along the annular frame body 2 to form a closed-loop storage space, and the construction waste recycled aggregate mixture is continuously injected into the annular groove 21 through the sidewall feeding pipe 22. When the printing assembly moves along the annular slide rail 3, the material in the annular groove 21 is accurately supplemented to the printing assembly through the bottom discharge port 31. The cover plate 211 is fixed on the top of the annular groove 21 by bolts, and when it is necessary to clean the residual material in the groove or switch different aggregate ratios, the cover plate 211 can be quickly disassembled for manual operation. The closed-loop structure design of the annular groove 21 increases the storage capacity by about 3 times, and the lateral feeding mode of the feeding pipe 22 effectively avoids the blockage risk caused by material accumulation.

[0073] The present scheme cooperates the annular groove 21 with the annular slide rail 3 to form a spatial coupling between the storage space and the printing path, and the lateral feeding mode of the feeding pipe 22 is more conducive to maintaining the uniformity of the material than the top feeding. The design of the detachable cover plate 211 breaks through the limitation of difficult maintenance of the traditional closed material bin, and compared with the welded fixed top cover, the maintenance efficiency is improved by about 60%. At the same time, the continuous and stable supply of construction waste recycled aggregate is realized, the structure of the annular groove 21 ensures the dynamic balance between material supply and consumption during printing, the lateral feeding of the feeding pipe 22 effectively maintains the stability of the material ratio, and the design of the detachable cover plate 211 significantly improves the convenience of equipment maintenance, avoiding the printing quality defects caused by material residues.

[0074] In addition, the vertical steel limiting plate 6 is slidably connected to the upper end of the lifting guide rail 1, a plurality of steel positioning holes 61 are arranged on the vertical steel limiting plate 6, and a plurality of reinforcing cross beams 11 are vertically and spaced apart fixedly connected to the lifting guide rail 1. The vertical steel limiting plate 6 is installed on the top end of the lifting guide rail 1 in a sliding connection mode, and the height position thereof can be adjusted according to the layout of the steel mesh before construction. The steel positioning holes 61 are arranged in an array form, for example, the distance between each column of holes is 50-100 mm, and are used for inserting and fixing the end of the steel bar. The reinforcing cross beams 11 are arranged at intervals of 1-2 meters along the length direction of the guide rail, for example, are welded to the sidewall of the guide rail in the form of I-shaped steel or channel steel, and form a multi-point support structure. During printing, after the steel mesh is fixed through the positioning holes, the lifting guide rail 1 drives the vertical steel limiting plate 6 to ascend synchronously, so as to ensure that the steel mesh is matched with the height of the printing layer, and the reinforcing cross beams 11 maintain the vertical stability of the guide rail.

[0075] The scheme realizes the rapid positioning and vertical synchronous lifting of the reinforcement mesh through the cooperation of the vertical reinforcement limiting plate 6 and the positioning hole, solves the problem of mispositioning of the reinforcement and the printing layer. In addition, the existing equipment lacks reinforcing structure, and the lifting guide rail 1 is easy to bend and deform under long-time high-load working conditions. The reinforcing cross beam 11 arranged at intervals significantly improves the bending resistance of the guide rail, realizes the precise positioning of the reinforcement mesh in the vertical direction, avoids the errors caused by manual adjustment, and enhances the structural stability of the guide rail through the reinforcing cross beam 11, ensuring that the equipment maintains vertical precision in high-strength printing operations and meets the continuous construction needs of concrete columns of different heights.

[0076] A 3D printing construction method based on construction waste recycled aggregate, specifically comprising the following steps:

[0077] According to the position of the reinforcement mesh, the vertical lifting mechanism is hoisted and positioned; the concrete column size and model parameters are input to the control system, and the pouring material is poured into the annular groove 21; the control system controls the sliding part 4 to slide to the position directly below the nearest discharge port 31, and controls the electromagnetic valve of the discharge port 31 to open to pour material into the containing cavity 41, and after pouring is completed, the electromagnetic valve is closed; the control system controls the output end of the printing assembly to be in the first position, the sliding part 4 slides along the annular slide rail 3 in the circumferential direction and performs the discharge printing action, and the material is stacked and printed on the outer protective layer of the concrete column layer by layer along the outside of the reinforcement mesh, and the control system controls the annular frame body 2 to rise with the increase of the protective layer stacking height; the air injection frame 5 is connected to the output end of the external curing steam supply equipment through the gas conduit 52, the control system controls the electric control valve to open, and the air injection holes of the air injection frame 5 inject steam at an appropriate temperature to cure the protective layer; the sliding part 4 slides to the position directly below any discharge port 31, the control system controls the electromagnetic valve of the discharge port 31 to open, and the control system controls the output end of the printing assembly to be in the second position to pour material into the space inside the protective layer; after the printing height reaches the preset value, the construction of a single concrete column is completed, and the vertical lifting mechanism is hoisted to the next construction area.

[0078] The vertical lifting mechanism hoisting positioning refers to adjusting the equipment installation position to match the spatial position of the reinforcement mesh, which can be achieved by connecting the lifting rail 1 top hoisting ring with the crane hook. The concrete column size parameter input refers to inputting the preset column height and cross-sectional size data into the control unit, which can be completed by parameter transmission through the touch screen or data interface. The annular groove 21 material filling refers to filling the recycled aggregate concrete into the annular storage space through the feeding pipe 22, which can be achieved by using a screw conveyor for continuous feeding. The first position of the print head refers to extending the discharge pipe 42 to the outside of the reinforcement mesh, and adjusting the length of the telescopic pipe 43 by the second telescopic cylinder 45 to keep the material outlet 46 at a certain distance from the outer surface of the reinforcement. The jet curing refers to introducing steam at a suitable temperature into the cavity of the jet frame 5 through the gas pipe 52, and the steam pressure can be controlled within 0.2-0.5 MPa, and the jet hole diameter can be set to 2-3 mm.

[0079] Specifically, in the positioning stage, the relative position of the equipment and the reinforcement mesh is detected by the laser range finder, and when the deviation exceeds 5 mm, the positioning calibration program is triggered. During the material supply process, the control system calculates the optimal feeding path according to the real-time position of the sliding part 4, and automatically plans to move to the nearest discharge port 31 when it is detected that the material storage in the containing cavity 41 is below the set threshold. In the printing protection layer stage, the annular frame body 2 is driven by the servo motor to rise along the lifting rail 1 at a speed of 0.5-2 cm / min, ensuring the uniformity of the printing layer thickness. During steam curing, the control system dynamically adjusts the steam injection amount according to the environmental temperature and humidity, and automatically stops jetting when the concrete surface temperature reaches 60°C. In the internal pouring stage, the discharge pipe 42 is driven to rotate 90 degrees by the first telescopic cylinder 44, so that the material outlet 46 is aligned with the internal space of the reinforcement mesh.

[0080] In some embodiments, a visual positioning system can be provided on the top of the lifting rail 1 to achieve millimeter-level positioning accuracy by capturing the feature point coordinates of the reinforcement mesh by a CCD camera. Two-stage warning mechanism can be set during material supply, and when the remaining amount in the containing cavity 41 is less than 30%, the preliminary feeding program is started, and when it is less than 10%, the printing is paused and the feeding operation is prioritized. The jet curing frame can be configured with multiple independent temperature control modules to implement differentiated curing strategies for different areas.

[0081] The method realizes continuous operation of protection layer printing and core pouring by the printing assembly with switchable position on the annular slide rail 3, avoiding process interruption. Compared with the lag operation of manual covering of curing film in the conventional curing method, the integrated jet curing frame 5 can implement steam curing immediately after printing, effectively shortening the concrete strength formation period.

[0082] Through the technical scheme, the application realizes precise application of construction waste recycled aggregate in 3D printing, and solves the technical problem of poor combination of the steel mesh part and the printing material. Through the synergistic effect of the automatic feeding mechanism and the position switching control, the synchronous forming of the concrete protective layer and the internal structure is ensured, and the structural integrity is improved. The intervention of the real-time curing system effectively controls the concrete hydration reaction process, and avoids the generation of surface cracking defects. The automatic control of the whole construction process reduces the manual intervention link, and the construction period of a single concrete column is shortened by about 40%.

[0083] In the above method, a jetting time threshold is set, and after the threshold is reached, the control system controls the jetting frame 5 to rise to jet the upper protective layer. When the protective layer is printed to the set height, the jetting frame 5 starts steam jetting, and at this time the control system starts to accumulate the jetting time. When the jetting time reaches the preset threshold, it indicates that the current height protective layer has completed the basic curing, and the control system triggers the lifting mechanism to drive the jetting frame 5 to rise to a new working height. In this process, the lifting stroke of the jetting frame 5 is synchronized with the vertical displacement of the printing assembly, so that the steam jetting always acts on the surface of the newly formed protective layer. This technical means avoids the hysteresis that may be caused by manual adjustment of the position of the jetting frame 5, and at the same time ensures that the protective layers at different heights can all obtain uniform curing conditions.

[0084] The scheme controls the steam curing through the synergistic control of the time threshold and the automatic lifting, so that the steam curing strictly matches the height change of the printing layer, avoids waste of curing resources, eliminates quality problems caused by delayed curing, realizes the automatic connection of the concrete protective layer curing operation and the 3D printing process, ensures that each printing layer obtains directional steam curing in the solidification critical period, effectively prevents shrinkage cracking caused by too rapid evaporation of water on the concrete surface, and improves the overall structural uniformity of the concrete column through layered progressive curing.

[0085] The places not mentioned in the application can be realized by using or referring to the existing technology.

[0086] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0087] The above only describes the embodiments of the application and is not used to limit the application. The application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application shall be included in the scope of the claims of the application.

Claims

1. A 3D printing device based on recycled aggregate from construction waste, characterized in that, The device includes a vertical lifting mechanism, which has a receiving area in the middle for accommodating steel mesh. A ring frame body (2) is slidably connected to the vertical lifting mechanism. A ring storage mechanism is provided above the ring frame body (2). A ring slide rail (3) is provided below the ring frame body (2). A printing component is slidably connected to the ring slide rail (3). Several discharge ports (31) are provided at the bottom of the storage mechanism. A solenoid valve is provided on the discharge port (31). Several discharge ports (31) pass through the ring slide rail (3) and are arranged at equal intervals along the ring slide rail (3). When the printing component slides to the discharge port (31), the solenoid valve opens to replenish the printing component with material. The output end of the printing component can be extended and retracted to have a first position outside the steel mesh and a second position inside the steel mesh. It also includes a control system, which controls the opening or closing of the solenoid valve to achieve automatic feeding of the printing component, and the control system controls the output end of the printing component to automatically switch between a first position and a second position; The printing component is initially in the first position and slides circumferentially along the annular slide rail (3) to print the protective layer on the outside of the steel mesh. When the height of the protective layer reaches the threshold, the printing component switches from the first position to the second position to pour material into the steel mesh. The printing assembly includes a sliding part (4) that slides in cooperation with the annular slide rail (3). The upper end of the sliding part (4) is provided with a receiving cavity (41) for receiving materials. The lower end of the sliding part (4) is rotatably connected to a discharge pipe (42). The side wall of the sliding part (4) is rotatably connected to a first telescopic cylinder (44). The telescopic end of the first telescopic cylinder (44) is rotatably connected to the discharge pipe (42). The lower end of the discharge pipe (42) is slidably connected to a telescopic pipe (43). A second telescopic cylinder (45) is provided between the telescopic pipe (43) and the discharge pipe (42). The lower end of the telescopic pipe (43) is provided with a material outlet (46).

2. The 3D printing equipment based on recycled aggregate from construction waste according to claim 1, characterized in that, The cavity (41) is equipped with a material sensor for detecting the weight of the internal material. The material discharge rate of the sliding part (4) during the sliding stroke between two adjacent discharge ports (31) is N, the material storage in the cavity (41) detected by the material sensor is M, and the maximum material capacity of the cavity (41) is 4-5N. When M=N, the cavity (41) moves to the next discharge port (31) for material replenishment.

3. A 3D printing device based on recycled aggregate from construction waste according to claim 2, characterized in that, It also includes a jet frame (5) that is slidably connected to the vertical lifting mechanism. The jet frame (5) is located below the annular frame body (2) and is used to cure and solidify the protective layer printed by the printing component. The jet frame (5) has an airflow cavity inside. The inner side wall of the jet frame (5) is provided with jet holes. The outer side wall of the jet frame (5) is provided with a gas conduit (52) for connecting to the output end of an external curing steam supply device. The gas conduit (52) is provided with an electrically controlled valve.

4. A 3D printing device based on recycled aggregate from construction waste according to claim 3, characterized in that, The vertical lifting mechanism includes a lifting guide rail (1), the side wall of the annular frame body (2) is provided with a first guide slide that slides with the lifting guide rail (1), the side wall of the jet frame (5) is provided with a second guide slide (51) that slides with the lifting guide rail (1), and the lifting guide rail (1) is provided with a driving mechanism that drives the annular frame body (2) and the jet frame (5) to rise and fall along the lifting guide rail (1).

5. A 3D printing device based on recycled aggregate from construction waste according to claim 1, characterized in that, The annular storage mechanism includes an annular groove (21), the side wall of the annular groove (21) is provided with a feeding pipe (22), and the top of the annular groove (21) is detachably connected with a cover plate (211).

6. A 3D printing device based on recycled aggregate from construction waste according to claim 4, characterized in that, The upper end of the lifting guide rail (1) is slidably connected to a vertical steel bar limiting plate (6), and the vertical steel bar limiting plate (6) is provided with several steel bar positioning holes (61). The lifting guide rail (1) is vertically and fixedly connected with several reinforcing beams (11).

7. A construction method using the 3D printing equipment based on recycled aggregate from construction waste as described in any one of claims 1-6, characterized in that, Specifically, the following steps are included: S1. Position the vertical lifting mechanism according to the location of the steel mesh; S2. Input the concrete column size and model parameters into the control system, and fill the annular groove (21) with the pouring material; S3. The control system controls the sliding part (4) to slide directly below the nearest discharge port (31) and controls the solenoid valve of the discharge port (31) to open to fill the receiving cavity (41) with material. After filling is completed, the solenoid valve closes. S4. The control system controls the output end of the printing component to be in the first position. The sliding part (4) slides along the annular slide rail (3) in the circumferential direction and performs the material discharge printing action. The material is stacked layer by layer along the outside of the steel mesh to print the outer protective layer of the concrete column. The control system controls the main body of the annular frame (2) to rise as the height of the protective layer stacking increases. S5. The jet frame (5) is connected to the output end of the external curing steam supply equipment through the gas conduit (52). The control system controls the electric valve to open, and the jet holes of the jet frame (5) spray out steam at the appropriate temperature to cure the protective layer. S6. The sliding part (4) slides directly below any discharge port (31), the control system controls the solenoid valve of the discharge port (31) to open, the control system controls the output end of the printing component to be in the second position, and pours material into the internal space of the protective layer. S7. After the printing height reaches the preset value, the construction of a single concrete column is completed, and the vertical lifting mechanism is hoisted to the next construction area.

8. A construction method for a 3D printing equipment based on recycled aggregate from construction waste according to claim 7, characterized in that, In step S5, a jetting time threshold is set. Once the threshold is reached, the control system controls the jetting frame (5) to rise and perform jetting maintenance on the upper protective layer.

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