A continuous fiber reinforced concrete 3D printing head and method based on axial yarn path

Abstract

The present invention provides a continuous fiber reinforced concrete 3D printing head and method based on an axial yarn path, including a hollow tube with open ends provided in a concrete hopper, a mixing shaft of a mixing assembly adopting a hollow shaft, the hollow tube being fixed and axially penetrating the mixing shaft, and the hollow tube and the mixing shaft not contacting each other; a fiber feeding mechanism being provided at the top of the concrete hopper; and the method steps comprising: inserting the fiber bundle pulled out by the fiber feeding mechanism into the upper end of the hollow tube and pulling it out from the lower end of the hollow tube, passing the lower end of the fiber bundle through the inner ring of the nozzle assembly, and screwing the nozzle assembly onto the lower end of the concrete hopper. The present invention can adaptively adjust the distribution of multiple continuous fiber bundles in concrete while reducing the resistance to feeding the fiber bundles, and can accurately and flexibly control the distribution position of adjacent continuous fiber bundles in concrete, and only needs to adjust the threaded sleeve, which is very convenient and flexible.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete 3D printing equipment, and in particular to a continuous fiber reinforced concrete 3D printing head and method based on an axial yarn path, wherein the yarn path refers to the feeding path of the fiber bundle. Background Art

[0002] Traditional concrete 3D printing technology uses cement-based materials as the printing material, following a print path generated by a digital building model, and then stacking them layer by layer to ultimately form the building. Concrete 3D printing, with its environmentally friendly and formwork-free advantages, is considered a highly promising new construction technology with the potential to have a profound impact on the future development of the construction industry.

[0003] The current field of concrete 3D printing technology mostly uses a single material with high compressive strength and low tensile strength. If cracks appear in the printed product, the tensile strength is lost, resulting in continuous damage to the product, which is not conducive to the safe use of 3D printed buildings. To this end, the existing solution is to add continuous fibers as reinforcement, introducing the continuous fibers through holes in the outer wall into the concrete delivery pipe and then combining with the concrete at the nozzle. However, this method is very prone to wear and even breakage of the fiber bundles, and the fiber bundles encounter large resistance during the feeding process. Existing document CN111941584A provides a 3D printing device for fiber cement-based concrete materials, which includes a feed hopper, a pre-mixing hopper, a discharge pipe, an extruder head, and a vertical axis rod that vertically passes through the pre-mixing hopper and the discharge pipe in sequence. A fiber spool with fiber bundles is also provided on the feed hopper. During 3D printing, the fiber bundles to be printed on the fiber spool pass through the vertical axis rod and are extruded from the extruder head along with the concrete mortar for printing. This solution can introduce single or multiple layers of organic polymer fiber materials into the concrete sheet printing process. The entire printing process is simple and easy to operate, and the equipment is simplified and the cost is low.

[0004] However, the above scheme still has the following problems that need to be solved: 1. When reducing the feeding resistance of the fiber bundles, it is impossible to adaptively adjust the distribution of multiple continuous fiber bundles in the concrete; 2. When multiple continuous fiber bundles are introduced for printing, it is impossible to accurately and flexibly control the distribution position of adjacent continuous fiber bundles in the concrete; 3. Multiple independent axial through holes need to be set on the vertical axis to avoid the entanglement of multiple continuous fiber bundles, which has high processing requirements for the vertical axis and is inconvenient to lead out the fiber bundles; 4. Since the fiber spool is placed near the center of the top of the vertical axis, it is not convenient to install multiple fiber spools here. Summary of the Invention

[0005] In order to solve one or more technical problems mentioned in the background technology, the present invention provides a continuous fiber reinforced concrete 3D printing head and method based on an axial yarn path.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0007] A continuous fiber-reinforced concrete 3D printing head based on an axial yarn path includes a concrete hopper with a built-in stirring assembly. The stirring assembly is connected to a drive system via a transmission structure. A hollow tube with open ends is provided in the concrete hopper. The hollow tube and the concrete hopper are arranged coaxially. The upper end of the hollow tube serves as an inlet for a fiber bundle. The stirring shaft of the stirring assembly adopts a hollow shaft. The hollow tube is fixed and axially penetrates the stirring shaft. The hollow tube and the stirring shaft do not contact each other. A fiber feeding mechanism is provided on the top of the concrete hopper. The fiber bundle drawn out from the fiber feeding mechanism enters through the upper end of the hollow tube and extends out from the lower end of the hollow tube.

[0008] In order to further reduce the resistance encountered by the fiber bundle during the feeding process, the inner edge of the upper end of the hollow tube is in a curved structure.

[0009] As a preferred solution, the stirring shaft passes through the top cover of the concrete hopper, the top of the stirring shaft is located above the top cover, the upper part of the stirring shaft is connected to the drive system through a transmission structure, the drive system is fixed to the side wall of the concrete hopper, and a door-shaped bracket is fixed on the top cover. The top of the hollow tube passes through the door-shaped bracket and is fixedly connected to the door-shaped bracket.

[0010] As a preferred solution, the feed channel of the concrete hopper is arranged on the side wall of the concrete hopper; the stirring assembly adopts a propeller blade stirring assembly, and the lower end of the propeller blade is located at the lower end of the hollow tube.

[0011] In order to more conveniently install the fiber feeding mechanism while reducing the resistance to feeding the fiber bundles, the fiber feeding mechanism includes multiple groups of brackets fixed on the top cover of the concrete hopper, and each group of brackets is provided with a rotatable fiber material roll. The multiple groups of fiber material rolls together form a polygonal structure, and the hollow tube is located exactly on the vertical line where the center of the polygonal structure is located.

[0012] In order to adaptively adjust the distribution of multiple continuous fiber bundles in concrete while reducing the resistance to feeding the fiber bundles, and to precisely and flexibly control the distribution positions of adjacent continuous fiber bundles in concrete, the concrete hopper is connected to a detachable nozzle assembly at the lower end. The nozzle assembly includes an outer ring with a plurality of threaded holes radially arranged on the outer ring, the threaded holes being close to the lower end of the outer ring. A threaded sleeve is fitted in each threaded hole. A chamber is provided inside the threaded sleeve. A spring is provided in the chamber. The two ends of the spring are blocked. One end of a connecting rod is connected to the left end of the spring and the other end is connected to the inner ring. The vertical distance between the inner ring and the lower end of the outer ring should be controlled within 10 mm. The continuous fiber bundles pass through the through hole of the inner ring. The whole body consisting of the spring, connecting rod and inner ring can rotate freely relative to the threaded sleeve. When the threaded sleeve rotates clockwise, the whole body consisting of the inner ring, connecting rod, spring and threaded sleeve moves radially toward the center of the outer ring. When the threaded sleeve rotates counterclockwise, the whole body consisting of the inner ring, connecting rod, spring and threaded sleeve moves radially away from the center of the outer ring. As specially selected materials, the threaded sleeve, inner ring and connecting rod are made of plastic that does not adhere to concrete (such as polyvinyl chloride, polystyrene, and polytetrafluoroethylene that are resistant to high temperatures).

[0013] Furthermore, with the outer ring axis as the axis of symmetry, the inner ring and its connecting parts are symmetrically arranged in multiple groups.

[0014] Furthermore, all the inner rings can be brought close to and in contact with each other, and all the inner rings can be in contact with the inner wall of the outer ring.

[0015] Preferably, a retaining ring is provided inside the threaded sleeve, and a plug is provided at the outer end of the threaded sleeve. The retaining ring and the plug are used to axially limit the spring in a free state.

[0016] A method using the aforementioned continuous fiber reinforced concrete 3D printing head, comprising the following steps:

[0017] Step 1: Install the continuous fiber reinforced concrete 3D printing head on the actuator of the 3D printing equipment;

[0018] Step 2: insert the fiber bundle pulled out by the fiber feeding mechanism into the upper end of the hollow tube and pull it out from the lower end of the hollow tube;

[0019] Step 3, passing the lower end of the fiber tow through the inner ring of the nozzle assembly;

[0020] Step 4: Screw the nozzle assembly onto the lower end of the concrete hopper;

[0021] Step 5: Adjust the threaded sleeve to move the inner ring of the nozzle assembly radially by a set distance;

[0022] Step 6: Connect the material pipe of the concrete pumping system to the feed channel of the concrete hopper;

[0023] Step 7: First, start the concrete pumping system. After the concrete enters the concrete hopper, start the driving system. After that, the concrete and the fiber tow are extruded from the nozzle assembly together.

[0024] Step 8: Control the actuator to drive the continuous fiber reinforced concrete 3D printing head to perform printing along a predetermined trajectory.

[0025] Beneficial effect: The present invention can adaptively adjust the distribution of multiple continuous fiber bundles in concrete while reducing the resistance to fiber bundle feeding. Since the threaded hole is close to the lower end of the outer ring, when concrete is fed, the concrete will enter the inner cavity of the outer ring and act on the inner ring. When the concrete feeding speed increases, the radial component force applied by the concrete to the inner ring will also increase, causing the inner ring to move slightly outward in the radial direction. When the concrete feeding speed decreases, the radial component force applied by the concrete to the inner ring will also decrease. The inner ring will move radially inward under the action of the spring, and the radial movement of the inner ring will drive The fiber bundles move radially, thereby realizing adaptive adjustment of the continuous fiber bundles during the change of the concrete feeding speed; when multiple continuous fiber bundles are introduced for printing, the present invention can accurately and flexibly control the distribution position of adjacent continuous fiber bundles in the concrete, and only needs to adjust the threaded sleeve, which is very convenient and flexible. When adjusting the threaded sleeve, the threaded sleeve moves radially inward or outward, thereby driving the fiber bundles to move radially. Since the fiber bundles are always limited in the through holes of the inner ring, the amplitude / distance of the radial movement of the inner ring can be regarded as the adjustment accuracy of the continuous fiber bundles.

[0026] Compared to conventional vertical shafts with multiple independent axial through-holes, the present invention utilizes only a single hollow tube in conjunction with the aforementioned specific nozzle assembly to prevent entanglement of multiple continuous fiber bundles. Even if the continuous fiber bundles bend or twist within the hollow tube, they quickly reset themselves (returning to their stretched state). Furthermore, the hollow tube requires minimal machining, significantly reducing processing costs. Crucially, the fiber bundles can be easily extracted. Furthermore, the present invention facilitates the installation of multiple fiber spools (barrels wound with fiber). BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 、 Figure 2 This is an axonometric view of a continuous fiber reinforced concrete 3D printing head in an embodiment;

[0028] Figure 3 、 Figure 4 Schematic diagram of the internal structure of the continuous fiber reinforced concrete 3D printing head in the embodiment;

[0029] Figure 5 Schematic cross-sectional view of the hollow tube and mixing assembly of the continuous fiber reinforced concrete 3D printing head in the embodiment;

[0030] Figure 6 Schematic diagram of the nozzle assembly of the continuous fiber reinforced concrete 3D printing head in the embodiment (state 1);

[0031] Figure 7 Schematic cross-sectional view of the nozzle assembly of the continuous fiber reinforced concrete 3D printing head in the embodiment (state 1);

[0032] Figure 8 Schematic diagram of the nozzle assembly of the continuous fiber reinforced concrete 3D printing head in the embodiment (state 2);

[0033] Figure 9 1. Exploded view of the nozzle assembly of the continuous fiber reinforced concrete 3D printing head in the embodiment. Implementation Method

[0034] The technical solutions of the present invention are described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Example

[0035] like Figures 1 to 9 As shown, a continuous fiber reinforced concrete 3D printing head based on an axial yarn path includes a concrete hopper 5 with a built-in stirring assembly. The concrete hopper 5 is connected to the actuator of the 3D printing device through a mounting plate 6. The concrete feed channel 8 of the concrete hopper 5 is arranged on the side wall of the concrete hopper 5. The stirring assembly is connected to the drive system 4 through a transmission structure 41. A hollow tube 11 with open ends is provided in the concrete hopper 5. The hollow tube 11 is coaxially arranged with the concrete hopper 5. The upper end of the hollow tube 11 serves as an inlet for the fiber bundle. The stirring shaft 46 of the stirring assembly adopts a hollow shaft. The hollow tube 11 is fixed and axially penetrates the stirring shaft 46. The hollow tube 11 and the stirring shaft 46 do not contact each other. A fiber feeding mechanism 2 is provided on the top of the concrete hopper 5. The fiber bundle drawn out from the fiber feeding mechanism 2 enters through the upper end of the hollow tube 11 and extends out from the lower end of the hollow tube 11.

[0036] In this embodiment, the inner edge of the upper end of the hollow tube 11 is a smooth arc surface structure, and this smooth arc surface can reduce the wear on the fiber bundle to the greatest extent.

[0037] In this embodiment, the stirring assembly adopts a propeller blade stirring assembly, including a stirring shaft 46. The stirring shaft 46 passes through the top cover 32 of the concrete hopper 5, and the top of the stirring shaft 46 is located above the top cover 32. A propeller blade 47 is provided on the stirring shaft 46, and the lower end of the propeller blade 47 is located at the lower end of the hollow tube 11. A bearing 45 and a washer 44 are provided on the upper part of the stirring shaft 46. The stirring shaft 46 is rotatably connected to the top cover 32 of the concrete hopper 5 through the bearing 45 and the washer 44. A transmission structure 41 connected to the stirring shaft 46 is provided above the bearing 45. The transmission structure 41 is also connected to the drive system 4 (such as a motor 43, which is fixed to the outer wall of the concrete hopper 5 through a motor mounting base 42). The drive system 4 is fixed to the side wall of the concrete hopper 5; a gate-shaped bracket 31 is fixedly provided on the top cover 32, and the top of the hollow tube 11 passes through the gate-shaped bracket 31 and is fixedly connected to the gate-shaped bracket 31. During use, the concrete hopper 5 is filled with material through the concrete feeding channel 8; when the driving system 4 is running, the stirring shaft 46 is driven to rotate through the transmission structure 41, thereby radially stirring and squeezing (downward squeezing) the concrete in the concrete hopper 5, thereby realizing discharge.

[0038] In this embodiment, the fiber feeding mechanism 2 includes multiple sets of brackets 22 fixed on the top cover 32 of the concrete hopper 5. Figure 1 and Figure 2 The figure schematically shows three groups of brackets 22, each of which is provided with a rotatable fiber material roll 21, and the multiple groups of fiber material rolls 21 together form a polygonal structure. Figure 1 and Figure 2 The figure schematically shows a triangular structure, and the hollow tube 11 is located exactly on the vertical line where the center of the polygonal structure is located. When in use, the fiber bundles 9 pulled from each fiber material roll 21 pass through the hollow tube 11 and finally pass through the hollow tube 11 and the bottom of the concrete hopper 5.

[0039] In this embodiment, a detachable nozzle assembly is connected to the lower end of the concrete hopper 5. The nozzle assembly includes an outer ring 51, which is provided with an external thread so that the outer ring 51 can be screwed onto the internal thread of the lower end of the concrete hopper 5; a plurality of threaded holes 52 are radially provided on the outer ring 51, and a threaded sleeve 50 is fitted in each threaded hole 52. A chamber 53 is provided inside the threaded sleeve 50, and a spring 54 is provided in the chamber 53. Both ends of the spring 54 are blocked (specifically, a retaining ring 57 is provided inside the threaded sleeve 50, and a plug 58 is provided at the outer end of the threaded sleeve 50. The retaining ring 57 and the plug 58 are used to lock the spring 54 in a free state). Axial limit), one end of the connecting rod 55 is connected to the left end of the spring 54, and the other end is connected to the inner ring 56. The aperture of the inner ring 56 is preferably controlled at 5mm, and the vertical distance between the inner ring 56 and the lower end of the outer ring 51 is preferably controlled at 5-10mm. The whole composed of the spring 54, the connecting rod 55 and the inner ring 56 can rotate freely relative to the threaded sleeve 50; when the threaded sleeve 50 rotates clockwise, the whole composed of "the inner ring 56, the connecting rod 55, the spring 54 and the threaded sleeve 50" moves radially toward the center of the outer ring 51; when the threaded sleeve 50 rotates counterclockwise, the whole composed of "the inner ring 56, the connecting rod 55, the spring 54 and the threaded sleeve 50" moves radially away from the center of the outer ring 51. With the axis of the outer ring 51 as the axis of symmetry, multiple groups of inner rings 56 and their connecting parts are symmetrically arranged. Figures 6 to 9 The diagram schematically shows three groups of inner rings 56 and their connectors. All inner rings 56 can be brought close to each other and in contact, and all inner rings 56 can be pressed against the inner wall of the outer ring 51. When in use, the outer ring 51 is screwed onto the internal thread at the lower end of the concrete hopper 5, and the fiber bundle 9 is passed through the inner ring 56. Then, the threaded sleeve 50 is rotated or the threaded sleeve 50 is rotated while holding the inner ring 56 to adjust the inner ring 56 to a suitable position. At this time, the distance between the holes of adjacent inner rings 56 can be considered as the distance between adjacent limiting fiber bundles. Figure 7 In the figure, the three inner rings 56 are far apart. Figure 8 In FIG. 5 , the state in which the three groups of inner rings 56 are close to each other is reflected.

[0040] A method for using the continuous fiber reinforced concrete 3D printing head of this embodiment comprises the following steps:

[0041] Step 1: Install the continuous fiber reinforced concrete 3D printing head on the actuator of the 3D printing equipment;

[0042] Step 2: insert the fiber bundle 9 pulled out by the fiber feeding mechanism 2 into the upper end of the hollow tube 11 and pull it out from the lower end of the hollow tube 11;

[0043] Step 3, passing the lower end of the fiber tow 9 through the inner ring 56 of the nozzle assembly;

[0044] Step 4, screw the nozzle assembly onto the lower end of the concrete hopper 5;

[0045] Step 5: Adjust the threaded sleeve 50 to move the inner ring 56 of the nozzle assembly radially by a set distance;

[0046] Step 6: Connect the material pipe of the concrete pumping system to the feed channel of the concrete hopper 5;

[0047] Step 7: First, start the concrete pumping system. When the concrete enters the concrete hopper 5, start the driving system 4. After that, the concrete and the fiber bundle 9 are extruded from the nozzle assembly together.

[0048] Step 8: Control the actuator to drive the continuous fiber reinforced concrete 3D printing head to perform printing along a predetermined trajectory.

[0049] By adopting this method, the multiple fiber bundles 9 can be quickly and flexibly pulled into place, and the multiple fiber bundles can be effectively prevented from being twisted together.

[0050] By adopting the scheme in the embodiment, the distribution of multiple continuous fiber bundles in the concrete can be adaptively adjusted while reducing the resistance to the feeding of the fiber bundles. Since the threaded hole is close to the lower end of the outer ring 51, when the concrete is fed, the concrete will enter the inner cavity of the outer ring 51 and act on the inner ring 56. When the concrete feeding speed increases, the radial component of the force applied by the concrete to the inner ring 56 will also increase, causing the inner ring 56 to move slightly outward in the radial direction. When the concrete feeding speed decreases, the radial component of the force applied by the concrete to the inner ring 56 will also decrease. The inner ring 56 will move radially inward under the action of the spring 54. The radial movement of the inner ring 56 will drive the radial movement of the fiber bundles, thereby Adaptive adjustment of the continuous fiber bundle is achieved during the change of material speed; when multiple continuous fiber bundles are introduced for printing, the distribution position of adjacent continuous fiber bundles in the concrete can be accurately and flexibly controlled. It is only necessary to adjust the threaded sleeve 50, and the adjustable range of the spacing between adjacent continuous fiber bundles is 5 mm to any value between about the inner diameter of the lower end of the concrete hopper 5. The adjustable range is large, very convenient and flexible. When the threaded sleeve 50 is adjusted, the threaded sleeve 50 moves radially inward or outward, thereby driving the radial movement of the fiber bundle. Since the fiber bundle is always limited in the through hole of the inner ring 56, the amplitude / distance of the radial movement of the inner ring 56 can be regarded as the adjustment accuracy of the continuous fiber bundle.

[0051] Compared to conventional vertical shafts with multiple independent axial through-holes, the solution in this embodiment requires only a single hollow tube in conjunction with the aforementioned specific nozzle assembly to prevent entanglement of multiple continuous fiber bundles. Even if the continuous fiber bundle bends or twists within the hollow tube, it can quickly reset itself (return to its stretched state). Furthermore, the hollow tube has low machining requirements, significantly reducing processing costs. More importantly, it allows for very convenient extraction of the fiber bundle. Furthermore, the present invention facilitates the installation of multiple fiber spools.

Claims

1. A continuous fiber reinforced concrete 3D printing head based on an axial yarn path, comprising a concrete hopper (5) with a built-in stirring assembly, the stirring assembly being connected to a drive system (4) via a transmission structure (41), a hollow tube (11) with open ends being provided in the concrete hopper (5), the hollow tube (11) being coaxially arranged with the concrete hopper (5), the upper end of the hollow tube (11) serving as an inlet for a fiber bundle, and characterized in that: The stirring shaft (46) of the stirring assembly adopts a hollow shaft, the hollow tube (11) is fixed and axially penetrates the stirring shaft (46), and the hollow tube (11) and the stirring shaft (46) do not contact each other; a fiber feeding mechanism (2) is provided on the top of the concrete hopper (5), and the fiber bundle drawn out from the fiber feeding mechanism (2) enters through the upper end of the hollow tube (11) and extends from the lower end of the hollow tube (11); the fiber feeding mechanism (2) includes a plurality of groups of brackets (22) fixed on the top cover (32) of the concrete hopper (5), and a rotatable fiber material roll (21) is provided on each group of brackets (22), and a polygonal structure is formed by the plurality of groups of fiber material rolls (21), and the hollow tube (11) is just located on the vertical line where the center of the polygonal structure is located; the lower end of the concrete hopper (5) is connected to a detachable nozzle assembly, and the nozzle assembly includes an outer ring (51), and a rotatable fiber material roll (21) is provided on the outer ring (51). A plurality of threaded holes (52) are provided radially, a threaded sleeve (50) is fitted in each threaded hole (52), a chamber (53) is provided inside the threaded sleeve (50), a spring (54) is provided in the chamber (53), both ends of the spring (54) are blocked, one end of the connecting rod (55) is connected to the left end of the spring (54), and the other end is connected to the inner ring (56), and the whole composed of the spring (54), the connecting rod (55) and the inner ring (56) can Freely rotate relative to the threaded sleeve (50): when the threaded sleeve (50) rotates clockwise, the entirety of the inner ring (56), the connecting rod (55), the spring (54) and the threaded sleeve (50) moves radially toward the center of the outer ring (51); when the threaded sleeve (50) rotates counterclockwise, the entirety of the inner ring (56), the connecting rod (55), the spring (54) and the threaded sleeve (50) moves radially away from the center of the outer ring (51).

2. The continuous fiber reinforced concrete 3D printing head according to claim 1, characterized in that: The inner edge of the upper end of the hollow tube (11) is in a curved surface structure.

3. The continuous fiber reinforced concrete 3D printing head according to claim 1, characterized in that: The stirring shaft (46) passes through the top cover (32) of the concrete hopper (5), the top of the stirring shaft (46) is located above the top cover (32), the upper part of the stirring shaft (46) is connected to the drive system (4) through the transmission structure (41), the drive system (4) is fixed to the side wall of the concrete hopper (5), a gate-shaped bracket (31) is fixedly provided on the top cover (32), and the top of the hollow tube (11) passes through the gate-shaped bracket (31) and is fixedly connected to the gate-shaped bracket (31).

4. The continuous fiber reinforced concrete 3D printing head according to claim 3, characterized in that: The feed channel of the concrete hopper (5) is arranged on the side wall of the concrete hopper (5); the stirring assembly adopts a propeller blade stirring assembly, and the lower end of the propeller blade is located at the lower end of the hollow tube (11).

5. The continuous fiber reinforced concrete 3D printing head according to any one of claims 1 to 4, characterized in that: The axis of the outer ring (51) is used as a symmetry axis, and the inner ring (56) and its connecting parts are symmetrically arranged in multiple groups.

6. The continuous fiber reinforced concrete 3D printing head according to claim 5, characterized in that: All the inner rings (56) can be brought close to and in contact with each other, and all the inner rings (56) can be close to the inner wall of the outer ring (51).

7. The continuous fiber reinforced concrete 3D printing head according to claim 6, characterized in that: A retaining ring (57) is provided inside the threaded sleeve (50), and a plug (58) is provided at the outer end of the threaded sleeve (50). The retaining ring (57) and the plug (58) are used to axially limit the spring (54) in a free state.

8. A method for using the continuous fiber reinforced concrete 3D printing head according to any one of claims 1 to 7, characterized in that the steps include: Step 1: Install the continuous fiber reinforced concrete 3D printing head on the actuator of the 3D printing equipment; Step 2, inserting the fiber bundle (9) drawn out by the fiber feeding mechanism (2) through the upper end of the hollow tube (11) and pulling it out from the lower end of the hollow tube (11); Step 3, passing the lower end of the fiber bundle (9) through the inner ring (56) of the nozzle assembly; Step 4, screw the nozzle assembly onto the lower end of the concrete hopper (5); Step 5, adjusting the threaded sleeve (50) to move the inner ring (56) of the nozzle assembly radially by a set distance; Step 6, connecting the material pipe of the concrete pumping system to the feed channel of the concrete hopper (5); Step 7, first start the concrete pumping system, and then start the driving system (4) after the concrete material enters the concrete hopper (5), and then the concrete material and the fiber bundle (9) are extruded from the nozzle assembly together; Step 8: Control the actuator to drive the continuous fiber reinforced concrete 3D printing head to perform printing along a predetermined trajectory.

Images