Concrete 3D printing spray head for mixing admixture
By designing a concrete 3D printing nozzle that mixes admixtures, and utilizing a diversion mixing mechanism and drive components to achieve uniform mixing of admixtures and concrete slurry, the problem of clogging caused by poor mixing effect in existing technologies is solved, thereby improving printing speed and quality.
Patent Information
- Application Number
- CN202520286833.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Existing concrete 3D printing nozzles have poor mixing performance, resulting in uneven mixing of admixtures and concrete, which easily leads to clogging and limits printing speed and efficiency.
Design a concrete 3D printing nozzle for mixing admixtures, comprising a printing nozzle, nozzle housing, flow mixing mechanism and drive assembly. The flow mixing mechanism and micropores achieve uniform mixing of admixtures, and the drive assembly drives the mixing rotation to ensure that the admixtures are fully mixed with the concrete paste.
It achieves uniform mixing of concrete slurry and admixtures in the print head, avoids clogging, improves printing speed and quality, solves the problem of collapse and deformation of concrete printed components, and enhances the constructability of 3D printing.
Smart Images
Figure CN223838600U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of 3D printing technology, specifically to a concrete 3D printing nozzle with mixed admixtures. Background Technology
[0002] Concrete 3D printing technology is an additive manufacturing technology based on digital models and concrete materials. Because the printing process does not require mold support and offers high modeling freedom, it has been successfully applied in many structural engineering fields such as dams and building construction in recent years. 3D printed concrete differs from traditionally cast concrete in terms of material properties and forming methods. From a macroscopic perspective, 3D printed concrete materials must have good fluidity during pumping and extrusion to reduce pumping pressure and avoid pipe blockage and bursting; after extrusion, its strength must rapidly increase to resist deformation caused by its own weight, the weight of the layers above, and the extrusion pressure, preventing plastic collapse. To meet construction requirements—that is, the concrete material can be continuously stacked and formed—admixtures containing quick-setting components are usually added during concrete mixing to shorten the setting time.
[0003] 3D printed concrete typically employs a single-stage mixing process, where concrete and various admixtures are simultaneously added to a mixer and mixed. The admixtures significantly shorten the setting time of the concrete printing material, strictly limiting the allowable printing time. The printing material is then pumped into the print head, which extrudes the material along a pre-set trajectory, ultimately producing the designed concrete component. Because admixtures are added during the initial mixing stage, the setting and hardening time of the concrete printing material cannot be too short; otherwise, it will harden and clog the pipes during pumping and extrusion, limiting the printing speed of 3D printed concrete.
[0004] The concrete 3D printing nozzle is responsible for extruding and molding concrete materials and is one of the main structures of a concrete 3D printer. To achieve rapid transformation of concrete material properties and improve printing efficiency, it is most suitable to uniformly add admixtures containing quick-setting components into the concrete slurry within the printing nozzle. The hardening speed of the concrete material is then controlled through a second-stage mixing process within the printing head. Currently, commonly used printing heads are one-piece extrusion types, with the print head shell typically having a wider top and narrower bottom. A rotating shaft drives an auger to rotate and mix the concrete within the shell, preventing solidification and pushing the material out. If an interface is added to this type of print head shell to add admixtures, the poor mixing effect cannot guarantee uniform mixing between the admixture and concrete. Localized areas of concrete react with excessive admixtures and solidify rapidly, leading to print head blockage. Therefore, there is an urgent need to develop a concrete 3D printing nozzle that allows for continuous mixing of concrete and admixtures at the printing end, thereby improving the construction efficiency of 3D printed concrete. Utility Model Content
[0005] This invention provides a concrete 3D printing nozzle for mixing admixtures, aiming to solve the problems in the prior art.
[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0007] A concrete 3D printing nozzle for mixing admixtures includes a printing nozzle, a nozzle housing, a flow-dividing mixing mechanism, and a drive assembly. The nozzle housing has an upper mounting hole and a lower mounting hole that penetrate through the interior and exterior at its top and bottom, respectively, and a feed inlet that penetrates through the interior and exterior on its side wall. The printing nozzle is fixedly installed at the lower mounting hole. The flow-dividing mixing mechanism is installed inside the nozzle housing, with its upper end extending to the upper mounting hole. The flow-dividing mixing mechanism has an open cavity at its upper end, and a group of micropores communicating with the cavity are provided on the flow-dividing mixing mechanism. A sealing structure is fixedly installed at the upper mounting hole, and an admixture interface is installed on the sealing structure, communicating with the cavity. The drive assembly is fixedly installed on the sealing structure and connected to the upper end of the flow-dividing mixing mechanism for driving the flow-dividing mixing mechanism to rotate.
[0008] The beneficial effects of this utility model are as follows: During the printing process, concrete slurry is fed into the nozzle housing from the feed port, and at the same time, the admixture is fed into the cavity of the diversion and mixing mechanism from the admixture interface, and released into the slurry inside the nozzle housing through the micro-hole. The diversion and mixing mechanism is driven to rotate by the drive component to stir the concrete slurry, so that the admixture is evenly mixed in the concrete slurry to form printing material. The printing material is finally extruded by the printing nozzle to obtain the required printed component. The printing is convenient and efficient.
[0009] The print head provided by this utility model can achieve the purpose of fully and evenly mixing concrete slurry and liquid admixtures in the print head shell, controlling the amount of admixtures, and finally extruding smoothly. This allows the concrete material to solidify quickly after extrusion molding, improving the constructability of 3D printed concrete. It also solves the problem of concrete printed components collapsing and deforming due to excessively fast printing material stacking speed, thus increasing the printing speed.
[0010] Based on the above technical solution, the present invention can be further improved as follows.
[0011] Furthermore, the diversion and stirring mechanism includes a stirring longitudinal rod and multiple stirring transverse rods, each hollow inside. The stirring longitudinal rod is vertically installed inside the nozzle housing, and its upper end is connected to the drive assembly. The cavities are distributed within the stirring longitudinal rod. The multiple stirring transverse rods are evenly spaced and fixedly installed on the stirring longitudinal rod along its axial direction. They extend horizontally and communicate with the cavities. The micropore groups are distributed on the multiple stirring transverse rods.
[0012] The beneficial effect of adopting the above-mentioned further solution is that during the printing process, the driving component drives the stirring longitudinal rod to rotate multiple stirring cross rods, so as to fully cut the concrete slurry inside the stirring nozzle housing and ensure the printing quality.
[0013] In addition, the hollow structure of the stirring longitudinal bar and multiple stirring cross bars ensures that the admixture fed through the admixture interface is evenly and fully released into the concrete slurry inside the nozzle housing, thereby improving the admixture release and mixing effect and further ensuring the printing quality.
[0014] Furthermore, a threaded head is fixedly connected to the upper end of the stirring rod, and the threaded head is threadedly connected to the drive assembly.
[0015] The advantages of adopting the above-mentioned further solution are that the structure is simple, the design is reasonable, the stirring rod is connected to the drive component by a threaded head, the assembly is convenient, and it saves time and effort.
[0016] Furthermore, the multiple stirring crossbars are divided into multiple groups and evenly spaced along the axial direction of the stirring longitudinal bar. The multiple stirring crossbars in each group are evenly spaced along the circumference of the stirring longitudinal bar. The beneficial effect of adopting the above-mentioned further scheme is that the structure is simple and the multiple stirring crossbars are reasonably distributed so as to evenly spray the admixture into the concrete slurry, thereby further ensuring the printing quality.
[0017] Furthermore, stirring components are fixedly connected to each of the multiple stirring crossbars.
[0018] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The concrete slurry is further mixed by using a mixing component, which further ensures the printing quality.
[0019] Furthermore, each of the stirring components includes at least one stirring blade, and each stirring blade is fixedly connected to the stirring crossbar.
[0020] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The mixing blades rotate together with the mixing crossbar, and the mixing blades are used to further mix and push the concrete slurry, thereby further ensuring the printing quality.
[0021] Furthermore, each of the stirring components includes multiple stirring blades, which are respectively fixedly installed on the stirring crossbar, with different orientations and distributed at a certain angle to the horizontal plane.
[0022] The beneficial effect of adopting the above-mentioned further solution is that the stirring blades not only play a cutting and stirring role, but also have a pushing and extruding effect on the slurry, which is conducive to extrusion molding and further ensures the printing quality.
[0023] Furthermore, the sealing structure includes a sealing flange, which is fixedly installed at the upper opening of the cavity, and the admixture interface is fixedly installed on the sealing flange; the drive assembly includes a motor and a coupling, the motor is fixedly installed on the sealing flange, and its drive end is fixedly connected to the coupling, the lower end of the coupling passing through the center of the sealing flange; the lower end of the coupling is provided with an admixture chamber, which communicates with the admixture interface and the upper end of the cavity.
[0024] The beneficial effects of adopting the above-mentioned further solution are that it enables the continuous supply of admixtures through the admixture interface when the stirring rod and the stirring cross rod rotate. The motor drives the coupling and the diversion stirring mechanism to rotate, so as to stir the concrete slurry. The sealing structure between the coupling and the sealing flange enables the static part to continuously supply admixtures to the moving part while stirring, so that the admixtures are uniformly mixed in the concrete slurry to form printing material. The printing material is finally extruded by the printing nozzle to obtain the required printing component. The structure is simple and the mixing efficiency is high.
[0025] In addition, the use of a sealing flange allows the admixture to be smoothly added into the nozzle housing and released through the micropores, while preventing the slurry inside the nozzle housing from leaking to the motor end. This achieves both the admixture delivery function and the prevention of liquid corrosion to the drive components, making it a versatile device.
[0026] Furthermore, a speed reducer is also installed between the motor and the coupling.
[0027] The beneficial effect of adopting the above-mentioned further solution is that the reducer is reasonably set, which can reduce the motor speed to a reasonable stirring speed range and increase the output torque.
[0028] Furthermore, a feed pipe is fixedly connected to the feed inlet.
[0029] The advantages of adopting the above-mentioned further solution are that during printing, the concrete slurry is fed into the nozzle housing through the feed pipe, which makes feeding convenient and the overall structure compact. Attached Figure Description
[0030] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0031] Figure 2 This is a schematic diagram of the internal structure of the present invention;
[0032] Figure 3 for Figure 2 Enlarged view of A in the middle;
[0033] Figure 4 This is a three-dimensional structural diagram of the diversion and stirring mechanism in this utility model;
[0034] Figure 5 This is a front view of the diversion and stirring mechanism in this utility model;
[0035] Figure 6 This is a top view of the diversion and stirring mechanism in this utility model.
[0036] The attached diagram lists the components represented by each number as follows:
[0037] 1. Printing nozzle; 2. Printer housing; 3. Diverting and mixing mechanism; 4. Additive interface; 5. Mixing rod; 6. Mixing crossbar; 7. Threaded head; 8. Mixing blade; 9. Motor; 10. Coupling; 11. Reducer; 12. Feed pipe; 13. Sealing flange; 14. Sealing ring; 15. Wear ring; 16. Micropore; 17. Mounting bracket. Detailed Implementation
[0038] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0039] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0041] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0042] Example 1
[0043] like Figures 1 to 6 As shown, this embodiment provides a concrete 3D printing nozzle for mixing admixtures, including a printing nozzle 1, a nozzle housing 2, a flow-dividing mixing mechanism 3, and a drive assembly. The nozzle housing 2 has an upper mounting hole and a lower mounting hole that penetrate through the inside and outside, respectively, and a feed inlet that penetrates through the inside and outside, on the side wall of the nozzle housing 2. The printing nozzle 1 is fixedly installed at the lower mounting hole. The flow-dividing mixing mechanism 3 is installed inside the nozzle housing 2, with its upper end extending to the upper mounting hole. The flow-dividing mixing mechanism 3 has an open cavity at the upper end, and a group of micropores communicating with the cavity is provided on the flow-dividing mixing mechanism 3. A sealing structure is fixedly installed at the upper mounting hole, and an admixture interface 4 is installed on the sealing structure, communicating with the cavity. The drive assembly is fixedly installed on the sealing structure and is connected to the upper end of the flow-dividing mixing mechanism 3 for driving the flow-dividing mixing mechanism 3 to rotate.
[0044] During the printing process, concrete slurry is fed into the nozzle housing 2 through the feed port, while admixture is fed into the cavity of the diversion mixing mechanism through the admixture interface 4. The admixture is then released into the slurry inside the nozzle housing 2 through micropores. The diversion mixing mechanism 3 is driven by the drive component to rotate and mix the concrete slurry, so that the admixture is evenly mixed in the concrete slurry to form printing material. The printing material is finally extruded by the printing nozzle to obtain the desired printed component. The printing process is convenient and efficient.
[0045] Preferably, in this embodiment, the nozzle housing 2 is a cylindrical structure with open top and bottom ends.
[0046] In addition, the printing nozzle 1 is preferably of an inverted frustum-shaped structure, which is based on existing technology, and its specific structure and principle will not be described in detail here.
[0047] Based on the above scheme, the admixture interface 4 is used to connect to a volumetric pump that pumps the admixture.
[0048] The print head provided in this embodiment can achieve thorough and uniform mixing of concrete slurry and liquid admixtures within the print head housing, control the amount of admixtures, and ultimately ensure smooth extrusion. This allows the concrete material to solidify rapidly after extrusion molding, improving the constructability of 3D printed concrete. It also solves the problem of collapse and significant deformation of concrete printed components caused by excessively fast printing material stacking speed, thereby increasing printing speed.
[0049] Example 2
[0050] Based on Embodiment 1, in this embodiment, the diversion and stirring mechanism 3 includes a stirring longitudinal rod 5 and multiple stirring transverse rods 6, each with a hollow interior. The stirring longitudinal rod 5 is vertically installed inside the nozzle housing 2, and its upper end is connected to the driving assembly. The cavities are distributed within the stirring longitudinal rod 5. The multiple stirring transverse rods 6 are evenly spaced and fixedly installed on the stirring longitudinal rod 5 along its axial direction. They extend horizontally and communicate with the cavities. The micropore groups are distributed on the multiple stirring transverse rods 6.
[0051] During the printing process, the driving component drives the stirring longitudinal rod 5 to rotate multiple stirring cross rods 6, so as to fully cut the concrete slurry inside the stirring nozzle housing 2 and ensure the printing quality.
[0052] In addition, the hollow structure of the stirring longitudinal rod 5 and multiple stirring cross rods 6 allows the admixture fed through the admixture interface 4 to be released evenly and fully into the concrete slurry inside the nozzle housing 2, thereby improving the admixture release and mixing effect and further ensuring the printing quality.
[0053] Preferably, in this embodiment, the stirring rod 5 has a round rod-shaped structure and is hollow inside.
[0054] Preferably, in this embodiment, the multiple stirring rods 6 are each round rods with hollow interiors.
[0055] In addition, one end of the multiple stirring crossbars 6 is open and the other end is closed, and the open end is connected to the interior of the stirring longitudinal bar 5.
[0056] Preferably, in this embodiment, each micropore group includes a plurality of micropores 16, which are evenly distributed at intervals on the corresponding stirring crossbar 6, and at least one micropore 16 is also distributed on the closed end of the stirring crossbar 6.
[0057] Example 3
[0058] Based on Example 2, in this example, the upper end of the stirring rod 5 is fixedly connected to a threaded head 7, which is threadedly connected to the drive assembly.
[0059] The scheme has a simple structure and reasonable design. The stirring rod 5 is connected to the drive component by the threaded head 7, which is convenient to assemble and saves time and effort.
[0060] Preferably, in this embodiment, the upper end of the threaded head 7 is a frustum-shaped structure and the lower end is a frustum-shaped structure. Its lower end is fixedly connected and communicates with the upper end of the stirring rod 5, and its upper end is threaded around the lower end of the drive assembly.
[0061] Preferably, in this embodiment, the threaded head 7 has a channel with an open lower end, the lower end of which is connected to the upper end of the stirring rod 5; the upper end of the threaded head 7 has a threaded groove that is connected to the channel.
[0062] Alternatively, the upper end of the aforementioned stirring rod 5 can be directly welded to the lower end of the drive assembly, but this solution is not as convenient for disassembly and assembly as the one described above.
[0063] Example 4
[0064] Based on any one of Embodiments 2 to 3, in this embodiment, the multiple stirring crossbars 6 are divided into multiple groups and are evenly spaced along the axial direction of the stirring longitudinal bar 5, and the multiple stirring crossbars 6 in each group are evenly spaced along the circumferential direction of the stirring longitudinal bar 5.
[0065] The design is simple in structure, with multiple mixing crossbars distributed in a reasonable manner to evenly spray the admixture into the concrete slurry, thereby further ensuring the printing quality.
[0066] Example 5
[0067] Based on any one of Embodiments 2 to 4, in this embodiment, a stirring element is fixedly connected to each of the multiple stirring crossbars 6.
[0068] The solution has a simple structure and a reasonable design. It utilizes a mixing component to further mix the concrete slurry, thereby ensuring the quality of the printing.
[0069] Example 6
[0070] Based on Example 5, in this example, each of the stirring components includes at least one stirring blade 8, and each stirring blade 8 is fixedly connected to the stirring crossbar 6.
[0071] The scheme has a simple structure and reasonable design. The mixing blade 8 rotates together with the mixing crossbar 6, and the mixing blade 8 is used to further mix and push the concrete slurry, thereby further ensuring the printing quality.
[0072] Preferably, in this embodiment, each stirring blade 8 extends radially along the corresponding stirring crossbar 6, and one side of it is fixedly connected to the corresponding stirring crossbar 6.
[0073] Example 7
[0074] Based on Example 6, in this example, each of the stirring components includes a plurality of stirring blades 8, which are fixedly installed on the stirring crossbar 6, and their orientations are different and they are distributed at a certain angle to the horizontal plane.
[0075] The stirring blade 8 not only cuts and stirs, but also pushes and extrudes the slurry, which is beneficial for extrusion molding and further ensures the quality of printing.
[0076] Based on the above scheme, each stirring crossbar 6 can be equipped with one stirring blade 8 or multiple stirring blades 8, with the multiple stirring blades 8 distributed along the axial direction of the stirring crossbar 6.
[0077] Example 8
[0078] Based on the above embodiments, in this embodiment, the sealing structure includes a sealing flange 13, which is fixedly installed at the upper opening of the cavity, and the admixture interface 4 is fixedly installed on the sealing flange 13; the drive assembly includes a motor 9 and a coupling 10, the motor 9 is fixedly installed on the sealing flange 13, and its drive end is fixedly connected to the coupling 10, the lower end of the coupling 10 passes through the center of the sealing flange 13; the lower end of the coupling 10 is provided with an admixture chamber, which communicates with the admixture interface 4 and the upper end of the cavity.
[0079] This scheme enables continuous supply of admixtures through admixture interface 4 when the stirring rod 5 and stirring crossbar 6 rotate. The motor 9 drives the coupling 10 and the diversion mixing mechanism to rotate, thereby mixing the concrete slurry. The sealing structure between the coupling 10 and the sealing flange 13 enables the static part to continuously supply admixtures to the moving part while mixing, so that the admixtures are uniformly mixed in the concrete slurry to form printing material. The printing material is finally extruded by the printing nozzle to obtain the required printing component. The structure is simple and the mixing efficiency is high.
[0080] In addition, the sealing flange 13 allows the admixture to be smoothly added into the nozzle housing 2 and released through the micropores, while preventing the slurry inside the nozzle housing 2 from leaking to the motor end. This achieves both the admixture delivery function and the prevention of liquid corrosion to the drive components, making it a versatile function.
[0081] Example 9
[0082] Based on embodiment 8, in this embodiment, a speed reducer 11 is also installed between the motor 9 and the coupling 10.
[0083] The reducer 11 is reasonably designed, which can reduce the speed of motor 9 to a reasonable stirring speed range, and increase the output torque.
[0084] Preferably, this embodiment also includes an L-shaped mounting bracket 17, one end of which is fixedly sleeved on the reducer 11, and the other end is used for fixed connection with the printing equipment.
[0085] Preferably, in this embodiment, the middle part of the sealing flange 13 extends upward into a cylinder, and the lower end of the coupling 10 extends into the cylinder and connects with the threaded head 7.
[0086] Preferably, in this embodiment, at least one sealing ring 14 is installed between the cylinder on the sealing flange 13 and the coupling 10.
[0087] In addition, the inner wall of the cylinder on the sealing flange 13 is provided with an annular groove corresponding to the number of sealing rings 14.
[0088] Preferably, in this embodiment, the sealing flange 13 is fixedly connected to the mounting bracket 17 via a grid-type connecting cylinder, and the sealing flange 13 and the connecting cylinder are integrally formed.
[0089] Preferably, in this embodiment, the additive interface 4 passes through the connecting cylinder and is threadedly connected to the sealing flange 13, and communicates with the inner cavity of the coupling 10. The inner cavity of the coupling 10 is connected to the channel in the threaded head 7.
[0090] Preferably, in this embodiment, a wear-resistant ring 15 is installed between the upper end of the cylinder on the sealing flange 13 and the coupling 10.
[0091] It should be noted that the motor 9, coupling 10 and reducer 11 mentioned above are based on existing technologies, and their specific structures and principles will not be described in detail here.
[0092] Example 10
[0093] Based on the above embodiments, in this embodiment, a feed pipe 12 is fixedly connected to the feed inlet.
[0094] During printing, the concrete slurry is fed into the nozzle housing through the feed pipe 12, which is convenient for feeding and has a compact overall structure.
[0095] Based on the above scheme, one end of the feed pipe 12 is connected to the feed inlet, and the other end is used to connect to the volumetric pump for pumping concrete.
[0096] In addition, the upper edge of the feed pipe 12 is not lower than the upper edge of the stirring blade 8.
[0097] The working principle of this utility model is as follows:
[0098] During the printing process, concrete slurry is pumped into the nozzle housing 2 from the feed pipe 12, and admixture is pumped into the nozzle housing 2 from the admixture interface 4. The motor 9 drives the stirring longitudinal rod 5 and multiple stirring cross rods 6 to rotate to stir the concrete slurry, so that the admixture is evenly mixed in the concrete slurry to form printing material. The printing material is finally extruded from the printing nozzle to obtain the desired printed component. The printing process is convenient and efficient.
[0099] It should be noted that all electronic components involved in this utility model adopt existing technology, and all the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is existing technology.
[0100] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0101] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0102] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A concrete 3D printing nozzle for mixing admixtures, characterized in that: The device includes a printing nozzle (1), a nozzle housing (2), a flow-dividing and stirring mechanism (3), and a drive assembly. The nozzle housing (2) has an upper mounting hole and a lower mounting hole that penetrate through the inside and outside, respectively, and the side wall of the nozzle housing (2) has a feed inlet that penetrates through the inside and outside. The printing nozzle (1) is fixedly installed at the lower mounting hole. The flow-dividing and stirring mechanism (3) is installed inside the nozzle housing (2), and its upper end extends to the upper mounting hole. The flow-dividing and stirring mechanism (3) has an open cavity at the upper end, and the flow-dividing and stirring mechanism (3) has a group of micropores that communicate with the cavity. A sealing structure is fixedly installed at the upper mounting hole. An additive interface (4) is installed on the sealing structure and communicates with the cavity. The drive assembly is fixedly installed on the sealing structure and is connected to the upper end of the flow-dividing and stirring mechanism (3) to drive the flow-dividing and stirring mechanism (3) to rotate.
2. The concrete 3D printing nozzle with mixed admixtures according to claim 1, characterized in that: The diversion stirring mechanism (3) includes a stirring longitudinal rod (5) and multiple stirring transverse rods (6) that are hollow inside. The stirring longitudinal rod (5) is vertically installed inside the nozzle housing (2), and its upper end is connected to the driving assembly. The cavity is distributed inside the stirring longitudinal rod (5). The multiple stirring transverse rods (6) are evenly spaced and fixedly installed on the stirring longitudinal rod (5) along the axial direction of the stirring longitudinal rod (5). They extend horizontally and are connected to the cavity. The micropore group is distributed on the multiple stirring transverse rods (6).
3. The concrete 3D printing nozzle with mixed admixtures according to claim 2, characterized in that: The upper end of the stirring rod (5) is fixedly connected to a threaded head (7), which is threadedly connected to the drive assembly.
4. The concrete 3D printing nozzle with mixed admixtures according to claim 2, characterized in that: The multiple stirring crossbars (6) are divided into multiple groups and are evenly spaced along the axial direction of the stirring longitudinal bar (5). The multiple stirring crossbars (6) in each group are evenly spaced along the circumferential direction of the stirring longitudinal bar (5).
5. The concrete 3D printing nozzle with mixed admixtures according to claim 2, characterized in that: A stirring element is fixedly connected to each of the multiple stirring crossbars (6).
6. The concrete 3D printing nozzle with mixed admixtures according to claim 5, characterized in that: Each of the stirring components includes at least one stirring blade (8), and each stirring blade (8) is fixedly connected to the stirring crossbar (6).
7. The concrete 3D printing nozzle with mixed admixtures according to claim 6, characterized in that: Each of the stirring components includes multiple stirring blades (8), which are fixedly installed on the stirring crossbar (6) and have different orientations and are distributed at a certain angle to the horizontal plane.
8. The concrete 3D printing nozzle with mixed admixtures according to any one of claims 1-7, characterized in that: The sealing structure includes a sealing flange (13), which is fixedly installed at the upper opening of the cavity, and the admixture interface (4) is fixedly installed on the sealing flange (13); the drive assembly includes a motor (9) and a coupling (10), which is fixedly installed on the sealing flange (13), and its drive end is fixedly connected to the coupling (10), and the lower end of the coupling (10) passes through the center of the sealing flange (13); the lower end of the coupling (10) is provided with an admixture chamber, which is connected to the admixture interface (4) and the upper end of the cavity.
9. The concrete 3D printing nozzle with mixed admixtures according to claim 8, characterized in that: A speed reducer (11) is also installed between the motor (9) and the coupling (10).
10. The concrete 3D printing nozzle with mixed admixtures according to any one of claims 1-7, characterized in that: The feed inlet is fixedly connected to a feed pipe (12).