Steel strand dynamic deviation rectifying nozzle device for concrete 3D printing

Abstract

The utility model relates to the field of concrete 3D printing discloses a steel strand dynamic deviation rectification spray head device for concrete 3D printing, including two support plates, fixedly connected with same track between two support plates, the outside of track is equipped with electric cantilever, the below of electric cantilever is equipped with the agitator barrel of conical, there is stirring mechanism in the agitator barrel, the stirring mechanism includes hollow shaft, fixedly connected with steel strand limiter in the hollow shaft. The utility model has the advantages and effects as follows: through the limit orientation of hollow shaft integrated steel strand, dynamic deviation rectification and concrete conveying function, the synergic control of pressure regulation and control and stirring motor is combined, the accurate synchronous printing of steel strand and concrete is realized, steel strand positioning precision is high, and the package is dense, effectively promotes the tensile and bending performance of printing structure, and whole course automation operation, significantly improves construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of concrete 3D printing technology, and in particular to a dynamic correction nozzle device for steel strand in concrete 3D printing. Background Technology

[0002] In recent years, 3D concrete printing technology has rapidly developed in fields such as architecture, bridges, and special structures due to its advantages of high efficiency, flexibility, and saving template resources. This technology forms complex geometries by extruding concrete material layer by layer, breaking through the limitations of traditional construction processes. However, the inherent defects of concrete material, such as low tensile strength and high brittleness, severely restrict its application in load-bearing or large-span structures. To improve the mechanical properties of printed structures, existing technologies typically employ two methods: one is to incorporate fibers (such as steel fibers and carbon fibers) into the concrete material to improve crack resistance, but this method has limited effect on improving the overall bending and tensile strength of the structure; the other is to mimic traditional reinforced concrete structures by manually inserting reinforcing bars or prestressed steel strands after printing, but post-implantation easily leads to poor bonding between the concrete and the reinforcing material, and the process is cumbersome and difficult to automate, violating the core concept of efficient integration in 3D printing technology.

[0003] Some studies have attempted to embed short-cut fibers or metal meshes simultaneously during the printing process, but the reinforcement effect is discrete and the direction is difficult to control precisely. For scenarios requiring high-strength prestress, the continuous synchronous implantation of steel strands faces even greater challenges: traditional printing equipment lacks a mechanism for the coordinated control of steel strand delivery and concrete extrusion, easily leading to problems such as steel strand positioning misalignment and incomplete concrete encapsulation. Furthermore, the dynamic matching algorithms for steel strands and the printing path in existing technologies are still immature and difficult to adapt to the synchronous molding requirements of complex three-dimensional structures. Therefore, developing a technical solution that can achieve precise synchronous printing of steel strands and concrete, ensuring their coordinated stress distribution, has become a key breakthrough for promoting the application of 3D printed concrete in high-load-bearing structures. Therefore, we propose a dynamic correction nozzle device for steel strands in concrete 3D printing to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a dynamic correction nozzle device for steel strand in concrete 3D printing. It integrates steel strand positioning and guidance, dynamic correction and concrete conveying functions through a hollow mixing shaft. Combined with air pressure regulation and servo collaborative control, it achieves precise synchronous printing of steel strand and concrete. The steel strand has high positioning accuracy and is tightly wrapped, which effectively improves the tensile and bending resistance of the printed structure. Moreover, the whole process is automated, which significantly improves construction efficiency.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a dynamic correction nozzle device for steel strand in concrete 3D printing, comprising two support plates, with the same track fixedly connected between the two support plates, an electric suspension beam slidably sleeved on the outer side of the track, a conical mixing tank below the electric suspension beam, a mixing mechanism inside the mixing tank, the mixing mechanism comprising a hollow shaft, a steel strand limiter fixedly connected inside the hollow shaft, a dynamic correction mechanism inside the steel strand limiter, a hanging beam type wheel mechanism on the left and right sides of the electric suspension beam, on which multiple turns of steel strand are wound, and a nozzle fixedly connected to the bottom of the mixing tank.

[0006] A further feature of this invention is that a pressure device is fixedly connected to the bottom inner wall of the electric suspension beam, the pipe of the pressure device can be directly connected to a closed mixing tank, a stirring motor is fixedly connected to the electric suspension beam, the output shaft of the stirring motor is connected to the top of the hollow shaft, and blades are provided on all four sides of the hollow shaft.

[0007] By adopting the above technical solution, premixed concrete slurry is injected into the mixing tank, and the mixing motor is started. The mixing motor drives the hollow shaft and blades to rotate at a speed of 30-50 rpm, so that the concrete is mixed evenly. At the same time, compressed air (pressure adjustment range is 0.1-0.3MPa) is injected into the mixing tank through the pressure injector, which pushes the concrete to flow along the conical bottom of the mixing tank towards the nozzle. At the nozzle, the steel strands are extruded synchronously with the concrete. The conveying speed of the steel strands and the extrusion rate of the concrete are coordinated and controlled by the mixing motor to ensure that the steel strands are always tightly wrapped by the concrete. During the printing process, according to the preset three-dimensional path model, the moving trajectory of the nozzle is dynamically adjusted by the CNC system, which controls the position of the electric cantilever beam on the track so that the direction of the steel strands is consistent with the direction of the structural stress.

[0008] The present invention is further configured as follows: the dynamic correction mechanism includes two front and rear laser displacement sensors, two left and right laser displacement sensors, two upper cylinders and two lower cylinders. The two left and right laser displacement sensors and the two lower cylinders are respectively fixedly connected to the inner walls of both sides of the steel strand limiter. The two upper cylinders and the front and rear laser displacement sensors are respectively fixedly connected to the inner walls of the front and rear sides of the steel strand limiter. A lower frame is fixedly connected to the output shaft of the lower cylinder. Lower guide wheels are rotatably connected to the inner walls of the front and rear sides of the lower frame. An upper frame is fixedly connected to the output shaft of the upper cylinder. Upper guide wheels are rotatably connected to the inner walls of both sides of the upper frame. The dynamic correction mechanism also includes a correction cover fixedly connected inside the steel strand limiter. The correction cover is located below the lower cylinders.

[0009] By adopting the above technical solution, the position of the steel strand is detected in real time by the left and right laser displacement sensors and the front and rear laser displacement sensors. If a front-to-back or left-to-right offset is detected, the CNC system dynamically controls the upper / lower cylinder to drive the corresponding upper guide wheel to move forward / backward or drive the lower guide wheel to move left / right, so as to correct the steel strand. The correction cover with a larger upper part and a smaller lower part can further guide and correct the steel strand, further ensuring the extrusion position accuracy of the steel strand.

[0010] A further feature of this invention is that the hanging beam type wheel mechanism includes four damping seats, each of which is rotatably connected to a turntable. A common hanging beam is fixedly connected between two turntables. A wheel is fixedly sleeved on the outer side of the hanging beam. Multiple turns of steel strand are wound around the outer side of the wheel. The four damping seats are respectively fixedly connected to both sides of the electric suspension beam. Rubber sleeves are fixedly connected to both sides of the mixing tank. Two steel strands are slidably sleeved in their respective rubber sleeves.

[0011] By adopting the above technical solution, the free ends of the steel strands on both sides of the drum pass through the rubber sleeve of the mixing drum. After being limited by the steel strand limiter, they emerge from the center of the nozzle at the bottom of the mixing drum. The elastic material of the rubber sleeve ensures the airtightness of the mixing drum. When the steel strand roll on one side is exhausted, the damping flip beam can be switched to the other side of the drum to achieve uninterrupted wire supply, avoid construction interruption, and improve construction efficiency.

[0012] The beneficial effects of this utility model are:

[0013] 1. This utility model involves injecting premixed concrete slurry into a mixing tank, starting the mixing motor, which drives the hollow shaft and blades to rotate at 30-50 rpm, ensuring uniform mixing of the concrete. Simultaneously, compressed air (pressure adjustment range of 0.1-0.3 MPa) is injected into the mixing tank through a pressure injector, propelling the concrete along the conical bottom of the mixing tank towards the nozzle. At the nozzle, steel strands are extruded synchronously with the concrete. The conveying speed of the steel strands and the extrusion rate of the concrete are coordinated and controlled by the mixing motor to ensure that the steel strands are always tightly wrapped by the concrete. During the printing process, the movement trajectory of the nozzle is dynamically adjusted through a CNC system based on a preset three-dimensional path model, which controls the position of the electric cantilever beam on the track, ensuring that the direction of the steel strands is consistent with the direction of structural stress.

[0014] 2. This utility model uses left and right laser displacement sensors and front and back laser displacement sensors to detect the position of the steel strand in real time. If a front-back or left-right offset is detected, the CNC system dynamically controls the upper / lower cylinder to drive the corresponding upper guide wheel to move forward / backward or drive the lower guide wheel to move left / right, so as to correct the steel strand. The correction cover with a larger upper part and a smaller lower part can further guide and correct the steel strand, further ensuring the extrusion position accuracy of the steel strand.

[0015] 3. In this invention, the free ends of the steel strands on both sides of the rollers pass through the rubber sleeves of the mixing drum. After being limited by the steel strand limiter, they emerge from the center of the nozzle at the bottom of the mixing drum. The elastic material of the rubber sleeve ensures the airtightness of the mixing drum. When the steel strand roll on one side is exhausted, the damping flip beam can be switched to the roller on the other side to achieve uninterrupted wire supply, avoid construction interruption, and improve construction efficiency. Attached Figure Description

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

[0017] Figure 1 This is a schematic diagram of the structure of a dynamic correction nozzle device for steel strand in concrete 3D printing proposed in this utility model.

[0018] Figure 2 This is an enlarged view of the electric suspension beam of the dynamic correction nozzle device for steel strand in concrete 3D printing proposed in this utility model.

[0019] Figure 3 This is a cross-sectional view of the mixing tank and hollow shaft of a dynamic correction nozzle device for steel strand in concrete 3D printing proposed in this utility model.

[0020] Figure 4 This utility model provides a detailed diagram of the steel strand connection for a dynamic correction nozzle device for concrete 3D printing using steel strands.

[0021] Figure 5 This is a cross-sectional view of the steel strand limiter of a dynamic correction nozzle device for concrete 3D printing.

[0022] In the diagram, 1. Support plate; 2. Track; 3. Electric cantilever beam; 4. Mixing tank; 5. Hanging beam type wheel mechanism; 6. Pressure generator; 7. Mixing motor; 8. Hollow shaft; 9. Blade; 10. Steel strand limiter; 11. Dynamic correction mechanism; 51. Turntable; 52. Steel strand; 53. Wheel; 54. Hanging beam; 55. Damping seat; 111. Correction cover; 112. Lower guide wheel; 113. Lower frame; 114. Lower cylinder; 115. Front and rear laser displacement sensors; 116. Upper cylinder; 117. Upper guide wheel; 118. Upper frame; 119. Left and right laser displacement sensors. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] See Figure 1 — Figure 4 This utility model provides a dynamic correction nozzle device for steel strand in concrete 3D printing, including two support plates 1, with the same track 2 fixedly connected between the two support plates 1. An electric suspension beam 3 is slidably sleeved on the outer side of the track 2. A conical mixing tank 4 is provided below the electric suspension beam 3. The mixing tank 4 contains a mixing mechanism, which includes a hollow shaft 8. A steel strand limiter 10 is fixedly connected inside the hollow shaft 8. A dynamic correction mechanism 11 is provided inside the steel strand limiter 10. A hanging beam type wheel mechanism 5 is provided on the left and right sides of the electric suspension beam 3, on which multiple turns of steel strand 52 are wound. A nozzle is fixedly connected to the bottom of the mixing tank 4.

[0025] Specifically, a pressure device 6 is fixedly connected to the bottom inner wall of the electric suspension beam 3, and the pipe of the pressure device 6 can be directly connected to the closed mixing tank 4.

[0026] Specifically, a stirring motor 7 is fixedly connected to the electric suspension beam 3, and the output shaft of the stirring motor 7 is connected to the top of the hollow shaft 8.

[0027] Specifically, blades 9 are provided on all four sides of the hollow shaft 8.

[0028] Specifically, the dynamic correction mechanism 11 includes two front and rear laser displacement sensors 115, two left and right laser displacement sensors 119, two upper cylinders 116 and two lower cylinders 114. The two left and right laser displacement sensors 119 and the two lower cylinders 114 are respectively fixedly connected to the inner walls on both sides of the steel strand limiter 10, and the two upper cylinders 116 and the front and rear laser displacement sensors 115 are respectively fixedly connected to the inner walls on the front and rear sides of the steel strand limiter 10.

[0029] Specifically, a lower frame 113 is fixedly connected to the output shaft of the lower cylinder 114, and a lower guide wheel 112 is rotatably connected to the inner walls of the front and rear sides of the lower frame 113. An upper frame 118 is fixedly connected to the output shaft of the upper cylinder 116, and an upper guide wheel 117 is rotatably connected to the inner walls of both sides of the upper frame 118.

[0030] Specifically, the dynamic correction mechanism 11 also includes a correction cover 111 fixedly connected inside the steel strand limiter 10, and the correction cover 111 is located below the lower cylinder 114.

[0031] Specifically, the hanging beam type wheel mechanism 5 includes four damping seats 55, each of which is connected to a turntable 51 for damping rotation. The same hanging beam 54 is fixedly connected between two turntables 51. A wheel 53 is fixedly sleeved on the outside of the hanging beam 54, and multiple turns of steel strand 52 are wound around the outside of the wheel 53.

[0032] Specifically, rubber sleeves are fixedly connected to both sides of the mixing tank 4, and two steel strands 52 are slidably sleeved in the corresponding rubber sleeves.

[0033] Specifically, the four damping seats 55 are fixedly connected to both sides of the electric suspension beam 3.

[0034] In this invention, the free ends of the steel strands 52 on the two side wheels 53 pass through the rubber sleeve of the mixing drum 4, are limited by the steel strand limiter 10, and then exit from the center of the bottom nozzle of the mixing drum 4. The elastic material of the rubber sleeve ensures the airtightness of the mixing drum 4. Premixed concrete slurry is injected into the mixing drum 4, and the mixing motor 7 is started. The mixing motor 7 drives the hollow shaft 8 and blades 9 to rotate at a speed of 30-50 rpm, ensuring uniform mixing of the concrete. Simultaneously, compressed air (pressure adjustment range of 0.1-0.3 MPa) is injected into the mixing drum 4 through the pressure injector 6, pushing the concrete along the conical bottom of the mixing drum 4 towards... The nozzle flows, and at the nozzle, the steel strand 52 is extruded synchronously with the concrete. The conveying speed of the steel strand 52 and the extrusion rate of the concrete are coordinated and controlled by the mixing motor to ensure that the steel strand 52 is always tightly wrapped by the concrete. During the printing process, according to the preset three-dimensional path model, the moving trajectory of the nozzle is dynamically adjusted by the CNC system, which controls the position of the electric suspension beam 3 on the track 2 so that the direction of the steel strand 52 is consistent with the direction of the structural force. When the steel strand roll on one side is exhausted, the damping flipping suspension beam 54 can be switched to the wheel 53 on the other side to achieve uninterrupted wire supply, avoid construction interruption, and improve construction efficiency.

[0035] In addition, the position of the steel strand 52 is detected in real time by the left and right laser displacement sensors 119 and the front and rear laser displacement sensors 115. If a front-to-back or left-to-right offset is detected, the CNC system dynamically controls the upper cylinder 116 / lower cylinder 114 to drive the corresponding upper guide wheel 117 to move forward / backward, or drive the lower guide wheel 112 to move left / right, so as to correct the steel strand 52. The correction cover 111, which is set with a larger upper part and a smaller lower part, can further guide and correct the steel strand 52, and further ensure the extrusion position accuracy of the steel strand 52.

Claims

1. A dynamic correction nozzle device for steel strands used in concrete 3D printing, characterized in that, It includes two support plates (1), and the same track (2) is fixedly connected between the two support plates (1). An electric suspension beam (3) is slidably sleeved on the outside of the track (2). A conical mixing tank (4) is provided below the electric suspension beam (3). A mixing mechanism is provided inside the mixing tank (4). The mixing mechanism includes a hollow shaft (8). A steel strand limiter (10) is fixedly connected inside the hollow shaft (8). A dynamic correction mechanism (11) is provided inside the steel strand limiter (10). A hanging beam type wheel mechanism (5) is provided on the left and right sides of the electric suspension beam (3). Multiple turns of steel strand (52) are wound on it. A nozzle is fixedly connected to the bottom of the mixing tank (4).

2. The dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 1, characterized in that: A pressure device (6) is fixedly connected to the bottom inner wall of the electric suspension beam (3), and the pipe of the pressure device (6) can be directly connected to the closed mixing tank (4).

3. The dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 1, characterized in that: A stirring motor (7) is fixedly connected to the electric suspension beam (3), and the output shaft of the stirring motor (7) is connected to the top of the hollow shaft (8).

4. The dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 1, characterized in that: The hollow shaft (8) is provided with blades (9) on all four sides.

5. The dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 1, characterized in that: The dynamic correction mechanism (11) includes two front and rear laser displacement sensors (115), two left and right laser displacement sensors (119), two upper cylinders (116) and two lower cylinders (114). The two left and right laser displacement sensors (119) and the two lower cylinders (114) are respectively fixedly connected to the inner walls on both sides of the steel strand limiter (10), and the two upper cylinders (116) and the front and rear laser displacement sensors (115) are respectively fixedly connected to the inner walls on the front and rear sides of the steel strand limiter (10).

6. The dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 5, characterized in that: The lower cylinder (114) is fixedly connected to the output shaft of the lower frame (113), and the lower guide wheel (112) is rotatably connected to the inner walls of the front and rear sides of the lower frame (113). The upper cylinder (116) is fixedly connected to the output shaft of the upper frame (118), and the upper guide wheel (117) is rotatably connected to the inner walls of both sides of the upper frame (118).

7. The dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 5, characterized in that: The dynamic correction mechanism (11) also includes a correction cover (111) fixedly connected inside the steel strand limiter (10), the correction cover (111) being located below the lower cylinder (114).

8. The dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 1, characterized in that: The hanging beam type wheel mechanism (5) includes four damping seats (55), each of which is connected to a turntable (51) for damping rotation. The same hanging beam (54) is fixedly connected between two turntables (51). A wheel (53) is fixedly sleeved on the outside of the hanging beam (54), and multiple turns of steel strand (52) are wound around the outside of the wheel (53).

9. The dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 1, characterized in that: Both sides of the mixing tank (4) are fixedly connected with rubber sleeves, and two steel strands (52) are slidably sleeved in the corresponding rubber sleeves.

10. A dynamic correction nozzle device for steel strand in concrete 3D printing according to claim 8, characterized in that: Four damping seats (55) are fixedly connected to both sides of the electric suspension beam (3).

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