Concrete 3D printing nozzle and 3D printing device

Abstract

The invention discloses a concrete 3D printing spray head and a 3D printing device, and relates to the technical field of 3D printing, the concrete 3D printing spray head comprises a spray head moving part, a printing spray nozzle and a material switching mechanism, the material moving part communicates with the printing spray nozzle, the material switching mechanism is installed on the surface of the spray head moving part, and the material switching mechanism comprises a material conveying pipe and two material blocking plates; the cross section of the material conveying pipe is in a Y shape, the lower end of the material conveying pipe communicates with the top end of the spray head moving part, and the two material blocking plates are located in two inclined branches of the material conveying pipe correspondingly. And when another concrete material is switched to, the current process does not need to be interrupted to re-access different material tanks, so that the condition of initial setting of the concrete in a waiting period caused by extra replacement time consumption is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a concrete 3D printing nozzle and a 3D printing device. Background Art

[0002] The concrete 3D printing device converts the graphic design model into a three-dimensional printing path, and then controls the movement trajectory and extrusion speed of the 3D printing nozzle through the control system to deposit the concrete material layer by layer onto the mobile platform. After each layer is deposited, the mobile platform will move slightly so that the nozzle can print the next layer. By repeating this process continuously, concrete components with complex shapes and structures can eventually be constructed.

[0003] When using a 3D printing device for structural printing, appropriate concrete materials need to be used according to the specific requirements of different structural parts to ensure that diverse printing needs are met. However, the 3D printing nozzle only supports single material output during the printing process. If you want to switch to another concrete material, you must interrupt the current process and reconnect to a different material tank. This process is not only cumbersome to operate, but also accompanied by additional time-consuming replacement, which often causes the concrete to initially set during the waiting period, thereby missing the best printing window, and ultimately having an adverse effect on the quality of the printed product.

[0004] The existing publication number is CN116619745A, which is a dual-nozzle soft material 3D printing device, including: a rotary dual-nozzle device, a feeding system XYZ three-axis motion system, a printing platform and a fuselage frame, and a control system. The rotary dual-nozzle device is mainly used for heating and extruding soft materials, the feeding system is mainly used for the supply of soft material raw materials, the XYZ three-axis motion system is mainly responsible for the transformation of the nozzle workpiece coordinates in the XYZ three-axis direction, the printing platform and the fuselage frame are mainly responsible for the shape construction of the overall machine, the support connection of some important structures, etc., and the control system is mainly used to control the work of the 3D printing device. The present invention has the advantages of being able to achieve mixed printing of two materials and high printing efficiency.

[0005] Although the above dual-nozzle soft material 3D printing device can realize mixed printing of two materials, it always needs to connect different discharge nozzles in actual use. When different nozzles stop outputting printing materials, some printing materials will still remain, which can easily cause nozzle blockage or initial coagulation of printing materials inside the nozzle, missing the best printing window, and ultimately affecting the quality of the printed product. Therefore, in response to the above technical problems, this application proposes a concrete 3D printing nozzle and a 3D printing device. Summary of the invention

[0006] The purpose of the present invention is to provide a concrete 3D printing nozzle and a 3D printing device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a concrete 3D printing nozzle and a 3D printing device, comprising a nozzle moving part and a printing nozzle, the material moving part is connected to the printing nozzle, and a material switching mechanism, wherein the material switching mechanism is installed on the surface of the nozzle moving part, the material switching mechanism comprises a material conveying pipe and two material baffles, the cross-sectional shape of the material conveying pipe is a "Y" shape, the lower end of the material conveying pipe is connected to the top of the nozzle moving part, the two material baffles are respectively located in the two inclined branches of the material conveying pipe, and the two inclined branches of the material conveying pipe are rotatably inserted with rotating rods, the two rotating rods are respectively fixedly connected to the arc surfaces of the two material baffles, one end of the two rotating rods is fixedly connected to a first bevel gear, the upper surface of the nozzle moving part is fixedly connected to a support frame, and the upper end of the support frame is fixedly installed with a first drive motor, and the output shaft of the first drive motor is fixedly connected to a second bevel gear matched with the two first bevel gears, and the second bevel gear is meshed with the two first bevel gears.

[0008] As a preferred technical solution of the present invention, a pre-printing mechanism on both sides is installed on the surface of the nozzle moving part, and the pre-printing mechanism on both sides includes a side conveying pipe, two first discharge nozzles and two second discharge nozzles. The side of the nozzle moving part is fixedly connected to two connecting blocks, and the two side conveying pipes are respectively fixedly inserted into the inside of the two connecting blocks. The lower ends of the two side conveying pipes are respectively connected to the first arc tube and the second arc tube, and the two first discharge nozzles are respectively connected to the two ends of the first arc tube, and the two second discharge nozzles are respectively connected to the two ends of the two second arc tubes.

[0009] As a preferred technical solution of the present invention, a heating and stabilizing mechanism is installed on the surface of the moving part of the nozzle. The heating and stabilizing mechanism includes four side baffles and four heating wires. The four heating wires are respectively fixed to the inside of the four side baffles.

[0010] As a preferred technical solution of the present invention, the four heating wires are all arranged in an "S" shape.

[0011] As a preferred technical solution of the present invention, two connecting frames are fixedly connected to the surface of the movable part of the nozzle, and the lower ends of the two connecting frames are fixedly connected to piston tubes. The first piston rod and the second piston rod are respectively inserted at both ends of the piston tube. The piston tubes form a piston assembly with the first piston rod and the second piston rod respectively, and the interior of the piston tube is filled with hydraulic oil. The surfaces of each two opposite side baffles are respectively fixedly connected with the first connecting bracket and the second connecting bracket, the first connecting bracket is fixedly connected to the first piston rod, and the second connecting bracket is fixedly connected to the second piston rod.

[0012] As a preferred technical solution of the present invention, the cross-sectional shapes of the four side baffle plates are all "L" shaped.

[0013] As a preferred technical solution of the present invention, a second driving motor is fixedly installed on the side of the nozzle moving part, the output shaft of the second driving motor is fixedly connected to a second lead screw, a connecting plate is fixedly connected to the surface of one of the side baffle plates, the second lead screw is threadedly inserted into the inside of the connecting plate, a first piston rod is inserted into the inside of the connecting plate, and the upper end of the first piston rod is fixedly connected to the side of the nozzle moving part.

[0014] A 3D printing device with a concrete 3D printing nozzle, comprising a printing equipment frame, a moving frame and a moving cross bar. The cross-sectional shape of the moving frame is "冂" shaped. The lower ends of the two longitudinal arm ends of the moving frame are both fixedly connected with first moving frames. The two first moving frames are respectively slidably connected to the two sides of the lower end of the printing equipment frame. First displacement motors are fixedly installed on the surfaces of the two first moving frames. The output shafts of the two first displacement motors are both fixedly connected with first lead screws. The two ends of the moving cross bar are respectively threadedly connected to the two first lead screws. The nozzle moving part is slidably connected to the surface of the moving cross bar.

[0015] As a preferred technical solution of the present invention, a third displacement motor is fixedly installed on the surface of the moving cross bar. The two ends of the moving cross bar are both rotatably connected with first transmission shafts. The output shaft of the third displacement motor is fixedly connected to one of the first transmission shafts. The two first transmission shafts are传动连接 by a first transmission belt. A second moving frame is fixedly connected to the surface of the nozzle moving part. The second moving frame is fixedly connected to the surface of the first transmission belt.

[0016] Second displacement motors are fixedly installed on both sides of the bottom of the printing equipment frame. Two second transmission shafts are rotatably connected to both sides of the bottom of the printing equipment frame. The output shaft of the second displacement motor is fixedly connected to one of the second transmission shafts. The two second transmission shafts are传动连接 by a second transmission belt. The two first moving frames are respectively fixedly connected to the surfaces of the two second transmission belts.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The present invention cooperates with the second bevel gear and a pair of first bevel gears. When the baffle plate acts on an inclined branch of the material conveying pipe, causing it to be in a sealed state, the other inclined branch is automatically opened, thereby ensuring that the corresponding material can smoothly flow out from the inclined branch of the material conveying pipe in the opened state, and be guided to the printing nozzle through the nozzle moving part, thereby realizing instant switching and efficient removal of materials. When switching to another concrete material, there is no need to interrupt the current process and reconnect to a different material tank, thereby avoiding the situation where the concrete initially sets during the waiting period due to the extra time-consuming replacement.

[0019] 2. In the present invention, when the required concrete is extruded through the printing nozzle, the fast-hardening cement concrete flows out from the first discharge nozzle or the second discharge nozzle in advance and solidifies along both sides of the preset printing path. Two boundaries are constructed by the early solidification of the fast-hardening cement concrete, and then the ordinary concrete is sprayed and filled between the two paths defined by the fast-hardening cement concrete. The flow range of ordinary concrete before solidification is effectively limited to prevent its diffusion area from being too large, thereby ensuring that the printing accuracy is not affected. At the same time, under the premise of minimizing the use of fast-hardening cement concrete, the increase in printing costs and excessive impact on the overall printing strength are avoided.

[0020] 3. When the fast-hardening cement concrete is discharged through the first discharge nozzle or the second discharge nozzle, the present invention limits the flow range of the fast-hardening cement concrete through the corresponding two side baffles, thereby further improving the printing accuracy. In addition, during the printing operation, the heating wire moderately heats the side baffles to 35 degrees Celsius, so that when the fast-hardening cement concrete contacts the heated side baffles, its curing rate is further accelerated, effectively reducing the flow tendency of the fast-hardening cement concrete, which not only further consolidates the improvement of printing accuracy, but also optimizes printing efficiency and quality by accurately controlling the material curing process.

[0021] 4. The present invention uses two second displacement motors to drive the second transmission belts matched with the two second transmission shafts to realize flexible horizontal (Z-axis) displacement of the print head; uses the first displacement motor to drive the first screw to rotate, thereby driving the print head to move vertically (Y-axis); uses the third displacement motor to drive the first transmission belt matched with the two first transmission shafts to drive the print head to move horizontally (X-axis) with the moving cross bar as the path, thereby ensuring that the print head has multi-position, high-precision flexible movement capabilities in the XYZ three-axis directions, significantly improving the flexibility and efficiency of 3D printing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the framework of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the first transmission belt part of the present invention;

[0025] Figure 4 is a schematic structural diagram of the second transmission belt portion of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the material switching mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure inside the material delivery pipe of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the pre-printing mechanism and the heating and stabilizing mechanism on both sides of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the pre-printing mechanism on both sides of the present invention;

[0030] Fig. 9 This is a schematic diagram of the structure of the heating and stabilizing mechanism of the present invention;

[0031] Fig.10 It is a schematic diagram of the structure of the side baffle and the heating wire of the present invention.

[0032] In the figure: 1. Printing device frame; 2. Mobile frame; 201. First screw rod; 202. Mobile cross bar; 203. First displacement motor; 204. Second displacement motor; 205. Third displacement motor; 206. First mobile frame; 207. Second mobile frame; 208. First transmission belt; 209. First transmission shaft; 210. Second transmission belt; 211. Second transmission shaft; 3. Nozzle moving part; 301. Material conveying pipe; 302. Support frame; 303. First drive motor; 304. First bevel gear; 305. Side conveying Tube; 306, second bevel gear; 307, baffle plate; 308, connecting block; 309, printing nozzle; 310, first discharge nozzle; 311, first arc tube; 312, second discharge nozzle; 313, second arc tube; 314, rotating rod; 4, side baffle plate; 401, connecting frame; 402, piston tube; 403, second drive motor; 404, second screw rod; 405, connecting plate; 406, first piston rod; 407, second piston rod; 408, first connecting bracket; 409, second connecting bracket; 410, heating wire. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-10 The present invention provides a technical solution for a concrete 3D printing nozzle and a 3D printing device:

[0035] according to Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, a concrete 3D printing nozzle comprises a nozzle moving part 3 and a printing nozzle 309, the material moving part is connected to the printing nozzle 309, and a material switching mechanism is installed on the surface of the nozzle moving part 3, the material switching mechanism comprises a material conveying pipe 301 and two baffle plates 307, the cross-sectional shape of the material conveying pipe 301 is "Y"-shaped, the lower end of the material conveying pipe 301 is connected to the top of the nozzle moving part 3, the two baffle plates 307 are respectively located in the two inclined branches of the material conveying pipe 301, when one baffle plate 307 makes one inclined branch of the material conveying pipe 301 in a closed state, the other inclined branch of the material conveying pipe 301 is in an open state, so that the corresponding material can flow out from the corresponding inclined branch of the material conveying pipe 301, so as to realize timely switching and timely removal of materials, and rotating rods 314 are rotatably inserted in the two inclined branches of the material conveying pipe 301, and the two rotating rods 314 are respectively fixedly connected to the arc surfaces of the two baffle plates 307.

[0036] Among them, one end of the two rotating rods 314 is fixedly connected to the first bevel gear 304, the upper surface of the nozzle moving part 3 is fixedly connected to the support frame 302, and the upper end of the support frame 302 is fixedly installed with the first driving motor 303, and the output shaft of the first driving motor 303 is fixedly connected to the second bevel gear 306 adapted to the two first bevel gears 304, and the second bevel gear 306 is meshed with the two first bevel gears 304. The first driving motor 303 can drive the second bevel gear 306 and the two first bevel gears 304 to rotate, thereby driving the baffle plate 307 to open and close.

[0037] During specific use, the two inclined branches of the material conveying pipe 301 are connected to the concrete supply module through a pipeline, and the concrete supply module is used to supply different required concrete materials. During printing, if different concrete materials need to be switched, the first drive motor 303 can be used to drive the second bevel gear 306 to rotate, and at the same time drive the two first bevel gears 304 to rotate. Since the two baffle plates 307 are in a vertical state relative to each other, when one baffle plate 307 makes one inclined branch of the material conveying pipe 301 in a closed state, the other inclined branch of the material conveying pipe 301 is in an open state, so that the corresponding material can flow out from the corresponding inclined branch of the material conveying pipe 301, and flow through the nozzle moving part 3 and out of the printing nozzle 309, so as to realize timely switching and timely removal of materials.

[0038] according to Figure 5 , Figure 7 and Figure 8 As shown, the pre-printing mechanism on both sides is installed on the surface of the nozzle moving part 3. The pre-printing mechanism on both sides includes a side conveying pipe 305, two first discharge nozzles 310 and two second discharge nozzles 312. The fast-hardening cement concrete flows out from the first discharge nozzle 310 or the second discharge nozzle 312 in advance. By making the fast-hardening cement concrete solidify in advance on both sides of the printing path, the path area of ​​the ordinary concrete flow can be prevented from being too large before the ordinary concrete solidifies, thereby affecting the printing accuracy. Two connecting blocks 308 are fixedly connected to the side of the nozzle moving part 3, and the two side conveying pipes 305 are respectively fixedly inserted into the inside of the two connecting blocks 308. The lower ends of the two side conveying pipes 305 are respectively connected to the first arc tube 311 and the second arc tube 313. The two first discharge nozzles 310 are respectively connected to the two ends of the first arc tube 311, and the two second discharge nozzles 312 are respectively connected to the two ends of the two second arc tubes 313.

[0039] During specific use, the two side conveying pipes 305 are connected to a concrete supply module containing quick-hardening cement concrete, and the required quick-hardening cement concrete is supplied through the concrete supply module. In this way, when the required concrete flows out from the printing nozzle 309 during printing, the quick-hardening cement concrete flows out from the first discharge nozzle 310 or the second discharge nozzle 312 in advance, and then ordinary concrete flows out from the printing nozzle 309. Since the two first discharge nozzles 310 and the two second discharge nozzles 312 are relatively arranged, and the quick-hardening cement concrete solidifies faster than ordinary concrete, the quick-hardening cement concrete is solidified in advance on both sides of the printing path, and then the ordinary concrete is sprayed between the two paths formed by the quick-hardening cement concrete. This can prevent the path area of ​​the ordinary concrete from being too large before the ordinary concrete solidifies, thereby affecting the printing accuracy. At the same time, the use of quick-hardening cement concrete can be minimized to avoid excessive printing costs and excessive impact on printing strength.

[0040] according to Figure 5 , Figure 7 , Fig. 9 and Fig.10 As shown. The heating and stabilizing mechanism is installed on the surface of the nozzle moving part 3. The heating and stabilizing mechanism includes four side baffles 4 and four heating wires 410. The four heating wires 410 are respectively fixedly installed inside the four side baffles 4. The side baffles 4 are heated by the heating wires 410. In this way, when the fast-hardening cement concrete contacts the side baffles 4, the curing speed of the fast-hardening cement concrete is further accelerated, thereby reducing the flow of the fast-hardening cement concrete and further improving the printing accuracy. The four heating wires 410 are all set in an "S" shape, which can increase the heating area of ​​the heating wires 410 and the uniformity of heat transfer.

[0041] Among them, two connecting frames 401 are fixedly connected to the surface of the nozzle moving part 3, and the lower ends of the two connecting frames 401 are fixedly connected to the piston tube 402. The first piston rod 406 and the second piston rod 407 are respectively inserted at both ends of the piston tube 402. The piston tube 402 and the first piston rod 406 and the second piston rod 407 respectively form a piston assembly, and the interior of the piston tube 402 is filled with hydraulic oil. The hydraulic oil transmits pressure to drive the two side baffles 4 connected by the first connecting bracket 408 to move in the opposite direction of the two side baffles 4 connected by the second connecting bracket 409. The heights of the two corresponding side baffles 4 are adjusted in time according to the moving path of the nozzle moving part 3 to prevent the side baffles 4 from affecting the change of the moving path of the nozzle head. The surfaces of each two opposite side baffles 4 are fixedly connected with a first connecting bracket 408 and a second connecting bracket 409, respectively. The first connecting bracket 408 is fixedly connected to the first piston rod 406, and the second connecting bracket 409 is fixedly connected to the second piston rod 407. The cross-sectional shape of the four side baffles 4 is "L"-shaped. The flow range of the quick-hardening cement concrete is limited by the corresponding two side baffles 4, so as to further improve the printing accuracy.

[0042] Among them, a second driving motor 403 is fixedly installed on the side of the nozzle moving part 3, and the output shaft of the second driving motor 403 is fixedly connected to the second screw rod 404, and the surface of one side baffle plate 4 is fixedly connected to the connecting plate 405, and the second screw rod 404 is inserted into the internal thread of the connecting plate 405. The second driving motor 403 drives the second screw rod 404 to rotate, and then drives the corresponding two side baffle plates 4 connected together by the second connecting bracket 409 to move longitudinally, and a first piston rod 406 is inserted into the interior of the connecting plate 405, and the upper end of the first piston rod 406 is fixedly connected to the side of the nozzle moving part 3.

[0043] During specific use, the rapid-hardening cement concrete is ejected through the first discharge nozzle 310 or the second discharge nozzle 312, and the flow range of the rapid-hardening cement concrete is restricted by the corresponding two side baffle plates 4, so as to further improve the printing accuracy. When the printing path direction is changed by the nozzle moving part 3, the second driving motor 403 drives the second lead screw 404 to rotate, and then drives the two side baffle plates 4 connected together through the second connecting bracket 409 to move longitudinally. Since the inside of the piston tube 402 is filled with hydraulic oil, and at the same time, when the second connecting bracket 409 moves up and down, it will drive the second piston rod 407 to extend or retract into the inside of the piston tube 402. Then, the pressure is transmitted through the hydraulic oil to make the second telescopic rod extend or retract into the inside of the piston tube 402. That is, when the second telescopic rod extends out of the piston tube 402, the first telescopic rod retracts into the piston tube 402, and when the second telescopic rod retracts into the piston tube 402, the first telescopic rod extends out of the piston tube 402. In this way, the two side baffle plates 4 connected by the first connecting bracket 408 are driven to move in the opposite direction to the two side baffle plates 4 connected by the second connecting bracket 409, so that the heights of the corresponding two side baffle plates 4 can be adjusted in time according to the moving path of the nozzle moving part 3, so as to prevent the side baffle plates 4 from affecting the change of the moving path of the nozzle head. And during the printing process, the side baffle plates 4 are heated by the heating wire 410. In this way, when the rapid-hardening cement concrete contacts the side baffle plates 4, the curing speed of the rapid-hardening cement concrete is further accelerated, so as to reduce the flow of the rapid-hardening cement concrete and further improve the printing accuracy.

[0044] According to Figure 1-4 As shown in the figure, a 3D printing device with a concrete 3D printing nozzle includes a printing equipment frame 1, a moving frame 2 and a moving cross bar 202. The cross-sectional shape of the moving frame 2 is "冂"-shaped. The lower ends of the two longitudinal arm ends of the moving frame 2 are both fixedly connected with first moving frames 206. The two first moving frames 206 are respectively slidably connected to the two sides of the lower end of the printing equipment frame 1. The surfaces of the two first moving frames 206 are both fixedly installed with first displacement motors 203. The output shafts of the two first displacement motors 203 are both fixedly connected with first lead screws 201. The two ends of the moving cross bar 202 are respectively threadedly connected to the two first lead screws 201. By driving the first lead screw 201 to rotate through the first displacement motor 203, the moving cross bar 202 and the printing nozzle can be driven to move vertically along the Y axis.

[0045] Among them, the nozzle moving part 3 is slidingly connected to the surface of the moving cross bar 202, and the third displacement motor 205 is fixedly installed on the surface of the moving cross bar 202. Both ends of the moving cross bar 202 are rotatably connected with the first transmission shaft 209. The output shaft of the third displacement motor 205 is fixedly connected to one of the first transmission shafts 209. The two first transmission shafts 209 are connected through the first transmission shaft 209. The third displacement motor 205 drives the first transmission belt 208 matched with the two first transmission shafts 209 to run, which can drive the printing nozzle to move horizontally along the X-axis with the moving cross bar 202 as the path.

[0046] Among them, the surface of the nozzle moving part 3 is fixedly connected with the second moving frame 207, and the second moving frame 207 is fixedly connected to the surface of the first transmission belt 208. Second displacement motors 204 are fixedly installed on both sides of the bottom of the printing device frame 1. Two second transmission shafts 211 are rotatably connected on both sides of the bottom of the printing device frame 1. The output shaft of the second displacement motor 204 is fixedly connected to one of the second transmission shafts 211. The two second transmission shafts 211 are transmission-connected through the second transmission belt 210. The two first moving frames 206 are respectively fixedly connected to the surfaces of the two second transmission belts 210. The second transmission belts 210 matched with the two second transmission shafts 211 are driven by the two second displacement motors 204 to run, thereby realizing the horizontal Z-axis movement of the first moving frame 206, the moving frame 2 and the printing nozzle.

[0047] During specific use, the two second displacement motors 204 are used to drive the second transmission belts 210 matched with the two second transmission shafts 211 to operate, so as to realize the horizontal Z-axis movement of the first movable frame 206, the movable frame 2 and the printing nozzle; the first displacement motor 203 is used to drive the first screw rod 201 to rotate, so as to drive the movable cross bar 202 and the printing nozzle to move longitudinally and vertically along the Y-axis; the third displacement motor 205 is used to drive the first transmission belt 208 matched with the two first transmission shafts 209 to operate, so as to drive the printing nozzle to move horizontally along the X-axis with the movable cross bar 202 as the path, so as to realize the multi-position flexible movement of the printing nozzle along the xyz axes respectively, so as to improve the flexibility of printing.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A concrete 3D printing nozzle, comprising a nozzle moving part (3) and a printing nozzle (309), wherein the material moving part is connected to the printing nozzle (309), characterized in that: A material switching mechanism, the material switching mechanism is installed on the surface of the nozzle moving part (3), the material switching mechanism comprises a material conveying pipe (301) and two material baffle plates (307), the cross-sectional shape of the material conveying pipe (301) is "Y"-shaped, the lower end of the material conveying pipe (301) is connected to the top of the nozzle moving part (3), the two material baffle plates (307) are respectively located in two inclined branches of the material conveying pipe (301), and the two inclined branches of the material conveying pipe (301) are both rotatably inserted with a rotating rod (314), and the two rotating rods (314) are rotatably inserted into the two inclined branches of the material conveying pipe (301). 14) are respectively fixedly connected to the arc surfaces of the two baffle plates (307), one end of the two rotating rods (314) are fixedly connected to the first bevel gear (304), the upper surface of the nozzle moving part (3) is fixedly connected to the support frame (302), the upper end of the support frame (302) is fixedly installed with a first driving motor (303), the output shaft of the first driving motor (303) is fixedly connected to the second bevel gear (306) adapted to the two first bevel gears (304), and the second bevel gear (306) is meshed with the two first bevel gears (304).

2. A concrete 3D printing nozzle according to claim 1, characterized in that: A two-side pre-printing mechanism, wherein the two-side pre-printing mechanism is installed on the surface of the nozzle moving part (3), and the two-side pre-printing mechanism comprises a side conveying pipe (305), two first discharge nozzles (310) and two second discharge nozzles (312). The side of the nozzle moving part (3) is fixedly connected with two connecting blocks (308), and the two side conveying pipes (305) are respectively fixedly inserted into the inside of the two connecting blocks (308). The lower ends of the two side conveying pipes (305) are respectively connected with a first arc tube (311) and a second arc tube (313). The two first discharge nozzles (310) are respectively connected with the two ends of the first arc tube (311), and the two second discharge nozzles (312) are respectively connected with the two ends of the two second arc tubes (313).

3. A concrete 3D printing nozzle according to claim 1, characterized in that: A heating and stabilizing mechanism is installed on the surface of the nozzle moving part (3), and comprises four side baffles (4) and four heating wires (410). The four heating wires (410) are respectively fixedly installed inside the four side baffles (4).

4. A concrete 3D printing nozzle according to claim 3, characterized in that: The four heating wires (410) are all arranged in an "S" shape.

5. A concrete 3D printing nozzle according to claim 1, characterized in that: Two connecting brackets (401) are fixedly connected to the surface of the nozzle moving part (3). The lower ends of the two connecting brackets (401) are fixedly connected to a piston tube (402). A first piston rod (406) and a second piston rod (407) are respectively inserted into both ends of the piston tube (402). The piston tube (402) and the first piston rod (406) and the second piston rod (407) form a piston assembly, and the inside of the piston tube (402) is filled with hydraulic oil. The surfaces of every two opposite side baffle plates (4) are respectively fixedly connected to a first connecting bracket (408) and a second connecting bracket (409). The first connecting bracket (408) is fixedly connected to the first piston rod (406), and the second connecting bracket (409) is fixedly connected to the second piston rod (407).

6. A concrete 3D printing nozzle according to claim 5, characterized in that: The cross-sectional shapes of the four side baffle plates (4) are all "L" shaped.

7. A concrete 3D printing nozzle according to claim 5, characterized in that: A second driving motor (403) is fixedly installed on the side of the nozzle moving part (3). The output shaft of the second driving motor (403) is fixedly connected to a second lead screw (404). A connecting plate (405) is fixedly connected to the surface of one of the side baffle plates (4). The second lead screw (404) is threadedly inserted into the inside of the connecting plate (405). The first piston rod (406) is inserted into the inside of the connecting plate (405), and the upper end of the first piston rod (406) is fixedly connected to the side of the nozzle moving part (3).

8. A 3D printing device with a concrete 3D printing nozzle, comprising a printing device frame (1), a moving frame (2) and a moving crossbar (202), characterized in that: The cross-sectional shape of the moving frame (2) is "冂" shaped. The lower ends of the two longitudinal arm ends of the moving frame (2) are both fixedly connected to a first moving frame (206). The two first moving frames (206) are respectively slidably connected to both sides of the lower end of the printing equipment frame (1). First displacement motors (203) are fixedly installed on the surfaces of the two first moving frames (206). The output shafts of the two first displacement motors (203) are both fixedly connected to a first lead screw (201). Both ends of the moving cross bar (202) are threadedly connected to the two first lead screws (201). The nozzle moving part (3) is slidably connected to the surface of the moving cross bar (202).

9. A 3D printing device having a concrete 3D printing nozzle according to claim 8, characterized in that: A third displacement motor (205) is fixedly installed on the surface of the moving cross bar (202). Both ends of the moving cross bar (202) are rotatably connected to a first transmission shaft (209). The output shaft of the third displacement motor (205) is fixedly connected to one of the first transmission shafts (209). The two first transmission shafts (209) are传动连接 (It seems there is a mistake here. Maybe it should be "driven and connected") through the first transmission shaft (209). A second moving frame (207) is fixedly connected to the surface of the nozzle moving part (3). The second moving frame (207) is fixedly connected to the surface of the first transmission belt (208); Second displacement motors (204) are fixedly mounted on both sides of the bottom of the printing device frame (1); two second transmission shafts (211) are rotatably connected to both sides of the bottom of the printing device frame (1); an output shaft of the second displacement motor (204) is fixedly connected to one of the second transmission shafts (211); the two second transmission shafts (211) are transmission-connected via a second transmission belt (210); and the two first movable frames (206) are respectively fixedly connected to the surfaces of the two second transmission belts (210).

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