ECC concrete 3D printing nozzle with adjustable caliber

Abstract

The invention relates to the technical field of ECC concrete stirring, and discloses a caliber-adjustable ECC concrete 3D printing nozzle which comprises a nozzle body, a concrete feeding port and a fiber feeding port are formed in the nozzle body, a fiber dispersing assembly is arranged in the fiber feeding port, a stirring and conveying assembly is further arranged in the nozzle body, and the stirring and conveying assembly is connected with the concrete feeding port. A concrete discharging opening is further formed in one side of the nozzle body; a discharging channel with the variable internal channel area is further arranged on the concrete discharging opening in a communicating mode. The fiber dispersing assembly comprises a first sleeve and a second sleeve, a plurality of fan-shaped baffles are hinged to the bottom of the first sleeve, the fan-shaped baffles can be spliced into a circular structure to seal the bottom of the first sleeve, fiber holes are formed in each fan-shaped baffle, the bottom of the second sleeve abuts against the top of each fan-shaped baffle, and the fiber holes are formed in the top of the second sleeve. The top of the second sleeve is further movably sleeved with a cover plate, and an air blowing assembly is arranged on the cover plate. The method has the advantages that the applicability is good, the construction period is shortened, and the 3D printing effect is good.

Description

Technical Field

[0001] The invention relates to an ECC concrete 3D printing nozzle with adjustable caliber, belonging to the technical field of ECC concrete mixing. Background Art

[0002] Concrete 3D printing technology is a technology that uses 3D printers to stack concrete layer by layer to create complex structures. Compared with traditional construction methods, concrete 3D printing technology has many advantages, such as reducing material waste, speeding up construction, and realizing complex structural design.

[0003] At present, in concrete 3D printing technology, an appropriate nozzle is needed to output concrete. The nozzle diameter is a key parameter affecting the quality of concrete 3D printing. It directly affects the extrusion amount of concrete slurry and is the key to determining the width of the printing track and whether the printing is successful. Therefore, the variable nozzle diameter is one of the important factors affecting the 3D printing style.

[0004] To this end, in the prior art, there is an invention patent with Chinese patent authorization announcement number CN112895060B, which discloses a concrete 3D printer nozzle, which is provided with a slurry thickness adjustment unit. When the slurry thickness adjustment unit is working, the valve plate driving part is driven by a valve plate driving motor, and the valve plate is driven by the valve plate driving motor and drives the valve plate to rotate together. The rotation of the valve plate can adjust the size of the nozzle opening, thereby adjusting the thickness of the printing layer to ensure the quality of concrete 3D printing.

[0005] However, at present, concrete 3D printing technology still has the following problems: the concrete structure printed by concrete 3D printing technology cannot have a built-in steel skeleton. If ordinary concrete is used, the printed concrete structure will have poor ductility and easy brittle failure. ECC concrete is a special type of concrete. It adds high-strength fiber materials such as polyvinyl alcohol (PVA) fiber, carbon fiber, steel fiber, etc. to traditional concrete to significantly improve its performance. The emergence of ECC concrete is mainly to solve the shortcomings of ordinary concrete in crack resistance, toughness and durability. Therefore, the application of ECC concrete in concrete 3D printing technology can effectively enhance the performance of 3D printed concrete structures. However, due to the characteristics of fiber materials, fiber materials, such as PVA materials, are usually not easy to disperse in concrete, which leads to the phenomenon of fiber agglomeration in ECC concrete, which has an adverse effect on the mechanical properties, durability and appearance of ECC concrete.

[0006] To this end, in the prior art, there is an invention patent with Chinese patent authorization announcement number CN115338980B, which discloses a mixer for fiber concrete. The mixer is provided with a separation component, which can perform preliminary crushing and separation on the added fibers, thereby avoiding agglomeration of the fibers due to accumulation during storage, preventing uneven mixing of the fibers with cement and sand in the later stage, and ensuring the quality of the ECC concrete produced.

[0007] However, there are still the following problems in actual use: The separation component mainly separates the fibers by stirring dispersion, and its dispersion effect will be affected by the stirring speed and time. It can only be applied to low-concentration fiber dispersion. When it is applied to high-concentration fiber dispersion, it will take a long time, which will greatly extend the construction period. Summary of the invention

[0008] In order to solve the above problems existing in the prior art, the present invention provides an ECC concrete 3D printing nozzle with adjustable caliber.

[0009] The technical solution of the present invention is as follows: An ECC concrete 3D printing nozzle with adjustable caliber includes a nozzle body, a concrete feeding port and a fiber feeding port are arranged on the nozzle body, a fiber dispersing component is arranged in the fiber feeding port, a stirring and conveying component is arranged in the nozzle body, and a concrete discharge port is arranged on one side of the nozzle body. The stirring and conveying component can mix the concrete entering from the concrete feeding port and the fiber entering from the fiber feeding port and send them to the concrete discharge port; the concrete discharge port is also connected to a discharge port with a variable internal channel area. Channel; The fiber dispersion component includes a first sleeve and a second sleeve, the first sleeve is movably mounted on the outside of the second sleeve, the first sleeve is movably installed in the fiber feeding port, a plurality of fan-shaped baffles are hinged on the bottom of the first sleeve, the fan-shaped baffles can be spliced ​​into a circular structure to close the bottom of the first sleeve, each fan-shaped baffle is provided with a fiber hole, the bottom of the second sleeve is arranged to abut against the top of each fan-shaped baffle, and the top of the second sleeve is also movably mounted with a cover plate, and the cover plate is provided with a blowing component that can blow gas into the second sleeve.

[0010] Furthermore, a first mounting hole is provided on the arcuate edge of each of the fan-shaped baffles, and a second mounting hole is provided at the bottom of the first sleeve in a one-to-one correspondence with the first mounting hole. Each fan-shaped baffle is hinged to the first sleeve by connecting a hinge shaft into the first mounting hole and the corresponding second mounting hole. When the hinge shaft is in a normal state, the fan-shaped baffles can be spliced ​​into a circular structure to close the bottom of the first sleeve.

[0011] Furthermore, a first mounting ear is provided on the outer wall of the first sleeve, a connecting rod is provided on the outer wall of the cover plate, a second mounting ear is provided on the bottom of the connecting rod, the first mounting ear and the second mounting ear are connected together by a connecting bolt, a serration is also provided on the outer wall of the connecting rod, a driving motor is also provided on the outside of the nozzle body, a rotating shaft is provided on the electric spindle of the driving motor, a driving gear meshing with the serration is provided on the rotating shaft, the second sleeve is provided to ensure that when the driving motor starts to work and the connecting rod drives the cover plate and the first sleeve to slide relative to the second sleeve under the meshing action of the driving gear and the serration, the second sleeve can push open each fan-shaped baffle.

[0012] Furthermore, each of the sector-shaped baffles is supported by magnetic materials, and a magnetic ring is also provided at the bottom of the second sleeve, and the magnetic ring can be attracted together with each sector-shaped baffle.

[0013] Furthermore, the blowing assembly includes fan blades arranged inside the cover plate and a fan blade motor arranged outside the cover plate, the electric spindle of the fan blade motor is movably inserted into the interior of the cover plate, and the fan blades are fixedly connected to the electric spindle of the fan blade motor.

[0014] Furthermore, the stirring and conveying assembly includes a stirring shaft, on which a stirring rod arranged in a spiral shape is arranged, and a stirring motor is also arranged outside the nozzle body, and the electric spindle of the stirring motor movably penetrates into the nozzle body and is connected to the stirring shaft.

[0015] Furthermore, the discharge channel includes a channel body, a partition is movably inserted into one side wall of the channel body, a mounting frame is also provided on the side wall of the channel body, a lifting cylinder is provided on the mounting frame, the piston rod end of the lifting cylinder is fixedly connected to the partition, and the lifting cylinder can control the area of ​​the partition extending into the channel body to change the internal channel area of ​​the channel body.

[0016] Furthermore, a sealing component is provided on the side wall of the channel body at a position where the partition plate penetrates, and the partition plate is movably arranged to pass through the sealing component.

[0017] Furthermore, a frustum structure is provided on the end of the partition extending into the channel body, and the ratio of the width of the frustum structure to the width of the partition is (2-3):1.

[0018] Further, the sealing member comprises a rubber sealing member, a through hole adapted to the cross section of the partition is provided in the middle of the rubber sealing member, the partition can movably pass through the rubber sealing member from the through hole, an electrostrictive member is provided on the outside of the rubber sealing member, the electrostrictive member can shrink to change the size of the through hole after being energized, a mounting groove is also provided on the side wall of the discharge channel, a mounting block is provided in the mounting groove, the electrostrictive member is installed on the mounting block, and the electrostrictive member and the rubber sealing member are both movably provided in the mounting groove, and a power supply electrically connected to the electrostrictive member is also provided on the side wall of the discharge channel.

[0019] The present invention has the following beneficial effects: 1. The present invention adopts a fiber dispersion component for air-blowing dispersion. The agglomerated fiber material is placed on the top of the fan-shaped baffle, and then the blowing component is started to work, so that the blowing component blows air into the second sleeve. The agglomerated fiber material will be dispersed under the action of the blown air flow and will fall out from the fiber holes in the form of filaments to enter the nozzle body through the fiber feeding port and mix with the concrete in the nozzle body. Compared with the stirring dispersion, the air-blowing dispersion has a fast dispersion speed and a uniform effect. It is not only suitable for low-concentration fiber dispersion, but also for high-concentration fiber dispersion. Compared with the prior art, it has the advantages of good applicability and shortened construction period.

[0020] 2. The present invention sets a discharge channel with a variable internal channel area. The ECC concrete discharged from the concrete discharge port needs to pass through the discharge channel before it can be discharged to the outside. When discharging ECC concrete with different fiber ratios, the area of ​​the internal channel of the discharge channel is changed, that is, the actual discharge port diameter of the ECC concrete can be adjusted to adapt to the discharge work of ECC concrete with different fiber ratios and meet the needs of 3D printing technology. Compared with the prior art, it has the advantage of good 3D printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the fiber dispersion component in the present invention; Figure 3 It is a schematic structural diagram of the first sleeve in the present invention; Figure 4 It is a schematic diagram of the structure of the second sleeve in the present invention; Figure 5 It is a structural schematic diagram of the connection between the first sleeve and the second sleeve in the present invention; Figure 6 It is a structural schematic diagram of the fan-shaped baffle in the present invention; Figure 7 It is a schematic diagram of the first structure of the cover plate in the present invention; Figure 8 is a second structural schematic diagram of the cover plate in the present invention; Fig. 9 It is a schematic diagram of the structure of the sealing component in the present invention.

[0022] The reference numerals in the figure are as follows: 1. Nozzle body; 2. Concrete feeding port; 3. Fiber feeding port; 4. Fiber dispersion assembly; 401. First sleeve; 402. Second sleeve; 403. Fan-shaped baffle; 404. Fiber hole; 405. Cover plate; 406. First mounting hole; 407. Second mounting hole; 408. First mounting ear; 409. Connecting rod; 410. Second mounting ear; 411. Connecting bolt; 412. Sawtooth; 413. Driving motor; 414. Rotating shaft; 415. Driving gear; 416. Magnetic ring; 5. stirring and conveying assembly; 51. stirring shaft; 52. stirring rod; 53. stirring motor; 6. Concrete discharge port; 7. Discharging channel; 71. Channel body; 72. Partition plate; 73. Mounting frame; 74. Lifting cylinder; 75. Mounting slot; 76. Mounting block; 8. Air blowing assembly; 81. Fan blade; 82. Fan blade motor; 9. Sealing assembly; 91. Rubber sealing element; 92. Through opening; 93. Electrostrictive element; 10. Cone structure; 11. Power supply. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example: Please refer to Figures 1 to 9The present embodiment provides an ECC concrete 3D printing nozzle with adjustable caliber, including a nozzle body 1. In the present embodiment, the nozzle body 1 is arranged in an L-shaped structure to facilitate the subsequent mixing of concrete and fiber. A concrete feed port 2 and a fiber feed port 3 are arranged on the nozzle body 1, wherein the concrete feed port 2 is arranged on the top end of the vertical section structure of the nozzle body 1, and the fiber feed port 3 is arranged on the right side wall of the vertical section structure of the nozzle body 1. A fiber dispersing component 4 for dispersing agglomerated fiber materials is arranged in the fiber feeding port 3, a stirring and conveying component 5 is also arranged in the nozzle body 1, and a concrete discharge port 6 is also arranged on the bottom surface of the left end of the cross-section structure of the nozzle body 1. The stirring and conveying component can mix the concrete entering from the concrete feeding port 2 and the fiber material entering from the fiber feeding port 3 and send them to the concrete discharge port 6; the concrete discharge port 6 is also connected to a discharge channel 7 with a variable internal channel area. The discharge channel 7 can change the actual discharge diameter of the ECC concrete by changing its own internal channel area to adapt to ECC concrete with different fiber proportions.

[0025] In this embodiment, the fiber dispersion component 4 includes a first sleeve 401 and a second sleeve 402. The first sleeve 401 is movably mounted on the outside of the second sleeve 402. The top of the second sleeve 402 can extend outward from the top of the first sleeve 401. The specific extension length can be determined according to actual conditions and is not limited here. The first sleeve 401 is movably installed in the fiber feeding port 3 to facilitate the subsequent feeding work. The bottom of the first sleeve 401 is hinged with a plurality of fan-shaped baffles 403. The number of fan-shaped baffles 403 can be determined according to actual conditions. In this embodiment, the number of fan-shaped baffles 403 is four. The four fan-shaped baffles 403 can be spliced ​​into a circular structure to close the bottom of the first sleeve 401. Each fan-shaped baffle 403 is provided with a fiber hole 404. The number and aperture of the fiber hole 404 can be determined according to actual conditions and are not limited here. At the same time, in the present embodiment, a first mounting hole 406 is provided at the arc-shaped edge of each fan-shaped baffle 403, and a second mounting hole 407 corresponding to the first mounting hole 406 is provided at the bottom of the first sleeve 401. Each fan-shaped baffle 403 is hinged to the first sleeve 401 by connecting a hinge axis into the first mounting hole 406 and the corresponding second mounting hole 407. When the hinge axis is in a normal state, the fan-shaped baffles 403 can be spliced ​​into a circular structure to close the bottom of the first sleeve 401. The bottom of the second sleeve 402 is arranged to abut against the top of each fan-shaped baffle 403, and a cover plate 405 is also movably provided on the top of the second sleeve 402, and a blowing component 8 capable of blowing gas into the second sleeve 402 is provided on the cover plate 405. In this embodiment, the blowing assembly 8 includes a fan blade 81 arranged inside the cover plate 405 and a fan blade motor 82 arranged outside the cover plate 405. The electric spindle of the fan blade motor 82 is movably inserted into the interior of the cover plate 405, and the fan blade 81 is fixedly connected to the electric spindle of the fan blade motor 82. When the fan blade motor 82 starts working, it can drive the fan blade 81 to rotate so as to blow air into the second sleeve 402.

[0026] Through the above-mentioned settings, when the fiber dispersion component 4 is working, the cover plate 405 is opened, and then the agglomerated fiber material is put into the second sleeve 402. The agglomerated fiber material will fall onto the fan-shaped baffle 403 in the first sleeve 401 under the action of gravity. The fan-shaped baffle 403 can block the agglomerated fiber material to prevent it from continuing to fall. Then, the fan motor 82 is started to work. The fan motor 82 drives the fan blade 81 to rotate, so that the fan blade 81 can blow air into the second sleeve 402. The agglomerated fiber material will be dispersed under the action of the blown air flow and will fall out of the fiber hole 404 in a filamentary shape, so as to enter the nozzle body 1 through the fiber hole 404, so that it can be mixed with the concrete in the nozzle body 1 later. Compared with the stirring dispersion, the blowing dispersion has a fast dispersion speed and a uniform effect, which can be applied not only to low-concentration fiber dispersion, but also to high-concentration fiber dispersion.

[0027] In this embodiment, the stirring and conveying assembly 5 includes a stirring shaft 51, on which a stirring rod 52 is arranged in a spiral shape. A stirring motor 53 is also arranged outside the nozzle body 1. The electric spindle of the stirring motor 53 is movably inserted into the nozzle body 1 and is connected to the stirring shaft 51. When the stirring motor 53 starts to work, it can drive the stirring shaft 51 to rotate so that the stirring rod 52 can rotate. The rotation of the stirring rod 52 can stir and mix the concrete and the fiber material. At the same time, the direction of the spiral can also continuously transport the concrete and the fiber material in the direction close to the concrete discharge port 6, thereby realizing the simultaneous mixing and feeding.

[0028] In this embodiment, the discharge channel 7 includes a channel body 71, the top end of the channel body 71 is connected to the concrete discharge port 6, and the ECC concrete delivered by the concrete discharge port 6 can be discharged to the outside only after passing through the channel body 71. A partition 72 is movably inserted into the left side wall of the channel body 71, and a mounting frame 73 is also provided on the left outer side wall of the channel body 71. A lifting cylinder 74 is provided on the mounting frame 73, and the piston rod end of the lifting cylinder 74 is fixedly connected to the left end of the partition 72. The lifting cylinder 74 can control the area of ​​the partition 72 extending into the channel body 71 to change the internal channel area of ​​the channel body 71.

[0029] Through the above-mentioned settings, when performing concrete 3D printing work in this embodiment, the 3D printing nozzle is first installed on the corresponding driving mechanism of the printer, and the concrete feeding port 2 is connected to the external concrete feeding component, and then the corresponding 3D printing work can be performed. By adding concrete into the concrete feeding port 2 and adding agglomerated fiber materials into the fiber dispersion component 4, the concrete will fall to the bottom of the nozzle body 1 under the action of gravity, and the agglomerated fiber materials will be dispersed into filamentary fibers under the action of the fiber dispersion component 4, and then fall to the bottom of the nozzle body 1 under the action of gravity. After that, the stirring and conveying component 5 starts to work, and the stirring and conveying component 5 can mix and convey the concrete with the filamentary fibers to prepare ECC concrete. The staff calculates the proportion of the fiber material in the prepared ECC concrete in advance according to the actual amount of fiber material added, and controls the lifting cylinder 74 to start working before the ECC concrete enters the channel body 71. According to the calculated fiber material ratio, the partition 72 is moved to a suitable position to adjust the internal channel area of ​​the discharge channel 7 to a suitable value to ensure the appropriateness of the discharge diameter. The specific relationship between the discharge diameter and the fiber material ratio can be determined based on actual experience or through actual experiments, and is not limited here. After that, the prepared ECC concrete will enter the channel body 71 from the concrete discharge port 6 under the action of the mixing and conveying assembly 5, and will be discharged from the channel body 71 to the outside, completing the corresponding discharge work, so that the required concrete 3D printing work can be performed. At the same time, according to needs, during the ECC concrete discharge process, the lifting cylinder 74 can also be controlled to start working to adjust the position of the partition 72, thereby adjusting the internal channel area of ​​the discharge channel 7, so as to achieve the variable discharge diameter during the ECC concrete discharge process, so that different thicknesses of concrete layers can be printed in one 3D printing process, making the printed concrete structure richer.

[0030] The agglomerated fiber material will become smaller in volume under the action of the blowing assembly 8. When the agglomerated fiber material is reduced to a certain extent, directly putting the small-volume agglomerated fiber material into concrete will not cause the agglomeration of the fiber material, and the blowing assembly 8 can be used for air-blowing dispersion to shorten the construction time. To achieve the above-mentioned purpose, in this embodiment, the outer wall of the first sleeve 401 is provided with symmetrically arranged first mounting ears 408, the outer wall of the cover plate 405 is provided with symmetrically arranged connecting rods 409, and the bottoms of the connecting rods 409 on both sides are provided with second mounting ears 410, and the second mounting ears 410 are arranged one-to-one with the first mounting ears 408. The first mounting ears 408 on both sides are connected to the corresponding second mounting ears 410 by connecting bolts 411, so that the cover plate 405 and the first sleeve 401 can be fixedly connected together. The outer walls of the connecting rods 409 on both sides are provided with symmetrically arranged saw teeth 412, and a driving motor 413 is also provided on the outside of the nozzle body 1. A rotating shaft 414 is provided on the electric spindle of the driving motor 413. The rotating shaft 414 is symmetrically arranged on both sides of the connecting rod 409, and each rotating shaft 414 is provided with a driving gear 415 meshing with the saw teeth 412. Through the above-mentioned arrangement, when the driving motor 413 starts working, it can drive the rotating shaft 414 to rotate, so that the driving gear 415 starts to rotate. When the driving gear 415 rotates, it drives the connecting rod 409 to perform corresponding up and down movements by engaging with the saw teeth 412, so that the cover plate 405 and the first sleeve 401 can slide with the second sleeve 402 in a corresponding manner. In order to smoothly achieve the above-mentioned purpose, the length setting of the second sleeve 402 should meet the requirement that when the driving motor 413 starts working and the connecting rod 409 drives the cover plate 405 and the first sleeve 401 to slide relative to the second sleeve 402 under the meshing action of the driving gear 415 and the saw teeth 412, the second sleeve 402 can push each fan-shaped baffle 403 away from the first sleeve 401, so that the agglomerated fiber material on the fan-shaped baffle 403 can fall directly into the nozzle body 1 through the fiber feeding port 3 without the need for dispersion of the blowing assembly 8, thereby shortening the construction time.

[0031] To ensure the reliability of the fan-shaped baffles 403 when they are spliced, each fan-shaped baffle 403 is supported by magnetic material, and a magnetic ring 416 is also provided at the bottom of the second sleeve 402. The magnetic ring 416 can be attracted together with each fan-shaped baffle 403 when the bottom of the second sleeve 402 abuts against each fan-shaped baffle 403, so that the fan-shaped baffle 403 is unlikely to fail in splicing except when it is pushed outward by the second sleeve 402, thereby ensuring that the clumped fiber material placed on the fan-shaped baffle 403 will not fall into the nozzle body 1 by mistake.

[0032] Since the connecting rod 409 is installed to connect the first sleeve 401 and the cover plate 405, in order to facilitate the subsequent feeding work, a feeding port for feeding the agglomerated fiber material should be opened on the side wall of the cover plate 405. At the same time, it should be noted that when feeding, the fan-shaped cover plate 405 should be in a spliced ​​state before the corresponding feeding can be carried out.

[0033] In this embodiment, a sealing component 9 is further provided on the left outer wall of the channel body 71 at the position where the partition 72 penetrates, and the partition 72 is movably arranged to pass through the sealing component 9. The setting of the sealing component 9 can prevent the ECC concrete from overflowing outward from the gap between the partition 72 and the channel body 71.

[0034] In order to facilitate the adjustment of the position of the partition 72 during the ECC concrete discharging process in the subsequent preparation process, a frustum structure 10 is provided on the right end of the partition 72. The frustum structure 10 enables the partition 72 to break the ECC concrete more easily when it moves, so as to facilitate the movement of the partition 72.

[0035] In this embodiment, the seal includes a rubber seal 91. A through hole 92 adapted to the cross section of the partition 72 is provided in the middle of the rubber seal 91. The partition 72 can move through the rubber seal 91 from the through hole 92. Due to the presence of the frustum structure 10, the rubber seal 91 needs to be able to stretch to adapt to the sealing of the frustum position. The rubber seal 91 is made of common natural rubber material, and its tensile length limit is mostly 3 to 4 times the original. Therefore, in this embodiment, the ratio of the width of the frustum structure 10 to the width of the partition 72 is 2 to 3:1 to adapt to the deformation range of the rubber seal 91. When the partition 72 passes through, the rubber seal 91 can be set closely to the outer wall of the partition 72 to play the role of preventing ECC concrete leakage. An electrostrictive member 93 is provided on the outside of the rubber seal 91. The electrostrictive member 93 is made of a common electrostrictive material, such as graphene. The electrostrictive member 93 can shrink after being energized so as to change the size of the through-hole 92 by squeezing the rubber seal 91. A mounting groove 75 is also provided on the top of the discharge channel 7. A mounting block 76 is provided in the mounting groove 75. The electrostrictive member 93 is mounted on the mounting block 76. The electrostrictive member 93 and the rubber seal 91 are both movably arranged in the mounting groove 75 so as to perform subsequent deformation actions. A power supply 11 electrically connected to the electrostrictive member 93 is also provided on the left outer side wall of the discharge channel 7.

[0036] Through the above arrangement, the electrostrictive element 93 is not energized under normal circumstances. Only when the lifting cylinder 74 drives the partition 72 to move and the partition 72 moves to the point where the frustum structure 10 enters the through-opening 92, that is, when the internal channel area of ​​the channel body 71 needs to be at the maximum, the power supply 11 starts to work and energizes the electrostrictive element 93. After being energized, the electrostrictive element 93 will shrink to squeeze the rubber seal 91, thereby changing the size of the through-opening 92, so that the through-opening 92 can adapt to the area of ​​the frustum structure 10, so that the rubber sealant can still be tightly attached to the frustum structure 10, so as to play the desired role in preventing ECC concrete leakage.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An ECC concrete 3D printing nozzle with adjustable caliber, comprising a nozzle body (1), characterized in that: The nozzle body (1) is provided with a concrete feed port (2) and a fiber feed port (3), a fiber dispersion component (4) is provided in the fiber feed port (3), a stirring and conveying component (5) is also provided in the nozzle body (1), and a concrete discharge port (6) is also provided on one side of the nozzle body (1), the stirring and conveying component can mix concrete entering from the concrete feed port (2) and fibers entering from the fiber feed port (3) and convey them to the concrete discharge port (6); a discharge channel (7) with a variable internal channel area is also provided in communication with the concrete discharge port (6); The fiber dispersion component (4) comprises a first sleeve (401) and a second sleeve (402), wherein the first sleeve (401) is movably sleeved on the outside of the second sleeve (402), and the first sleeve (401) is movably installed in the fiber feeding port (3). A plurality of fan-shaped baffles (403) are hingedly connected to the bottom of the first sleeve (401), and the fan-shaped baffles (403) can be spliced ​​together to form a circular structure to close the bottom of the first sleeve (401). A fiber hole (404) is provided on each fan-shaped baffle (403). The bottom of the second sleeve (402) is arranged to abut against the top of each fan-shaped baffle (403), and a cover plate (405) is movably sleeved on the top of the second sleeve (402). The cover plate (405) is provided with a blowing component (8) capable of blowing gas into the second sleeve (402).

2. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 1, characterized in that: The arc-shaped edge of each of the fan-shaped baffles (403) is provided with a first mounting hole (406), and the bottom of the first sleeve (401) is provided with a second mounting hole (407) arranged in a one-to-one correspondence with the first mounting hole (406). Each fan-shaped baffle (403) is hinged to the first sleeve (401) by connecting a hinge axis into the first mounting hole (406) and the corresponding second mounting hole (407). When the hinge axis is in a normal state, the fan-shaped baffles (403) can be spliced ​​into a circular structure to close the bottom of the first sleeve (401).

3. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 2, characterized in that: A first mounting ear (408) is provided on the outer wall of the first sleeve (401), a connecting rod (409) is provided on the outer wall of the cover plate (405), a second mounting ear (410) is provided at the bottom of the connecting rod (409), the first mounting ear (408) and the second mounting ear (410) are connected together by a connecting bolt (411), a sawtooth (412) is also provided on the outer wall of the connecting rod (409), and a drive motor (413) is also provided outside the nozzle body (1), and the drive motor (413) ) is provided with a rotating shaft (414), and a driving gear (415) meshingly connected to the saw teeth (412) is provided on the rotating shaft (414). The second sleeve (402) is arranged so that when the driving motor (413) starts to work and the connecting rod (409) drives the cover plate (405) and the first sleeve (401) to slide relative to the second sleeve (402) under the meshing action of the driving gear (415) and the saw teeth (412), the second sleeve (402) can push open each fan-shaped baffle (403).

4. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 2, characterized in that: Each of the sector-shaped baffles (403) is supported by a magnetic material, and a magnetic ring (416) is further provided at the bottom of the second sleeve (402). The magnetic ring (416) can be attracted to each of the sector-shaped baffles (403).

5. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 1, characterized in that: The air blowing assembly (8) comprises a fan blade (81) arranged inside the cover plate (405) and a fan blade motor (82) arranged outside the cover plate (405); the electric main shaft of the fan blade motor (82) is movably inserted into the interior of the cover plate (405); and the fan blade (81) is fixedly connected to the electric main shaft of the fan blade motor (82).

6. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 1, characterized in that: The stirring and conveying assembly (5) comprises a stirring shaft (51), on which a stirring rod (52) is arranged in a spiral shape. A stirring motor (53) is also arranged outside the nozzle body (1), and the electric spindle of the stirring motor (53) is movably inserted into the nozzle body (1) and connected to the stirring shaft (51).

7. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 1, characterized in that: The discharge channel (7) comprises a channel body (71), a partition plate (72) movably penetrates a side wall of one side of the channel body (71), a mounting frame (73) is also provided on the side wall of the channel body (71), a lifting cylinder (74) is provided on the mounting frame (73), a piston rod end of the lifting cylinder (74) is fixedly connected to the partition plate (72), and the lifting cylinder (74) can control the area of ​​the partition plate (72) extending into the channel body (71) to change the internal channel area of ​​the channel body (71).

8. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 7, characterized in that: A sealing component (9) is also provided on the side wall of the channel body (71) at a position where the partition plate (72) penetrates, and the partition plate (72) is movably provided to penetrate the sealing component (9).

9. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 8, characterized in that: A frustum structure (10) is also provided on the end of the partition (72) extending into the channel body (71), and the ratio of the width of the frustum structure (10) to the width of the partition (72) is (2-3):

1.

10. The ECC concrete 3D printing nozzle with adjustable caliber according to claim 9, characterized in that: The sealing member comprises a rubber sealing member (91), a through hole (92) adapted to the cross section of the partition (72) is provided in the middle of the rubber sealing member (91), the partition (72) can movably pass through the rubber sealing member (91) from the through hole (92), an electrostrictive member (93) is arranged outside the rubber sealing member (91), the electrostrictive member (93) can shrink after being energized to change the size of the through hole (92), a mounting groove (75) is further provided on the side wall of the discharge channel (7), a mounting block (76) is arranged in the mounting groove (75), the electrostrictive member (93) is mounted on the mounting block (76), and the electrostrictive member (93) and the rubber sealing member (91) are both movably arranged in the mounting groove (75), and a power supply (11) electrically connected to the electrostrictive member (93) is further arranged on the side wall of the discharge channel (7).

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