Concrete 3D printer nozzle

Abstract

The invention discloses a concrete 3D printer spray head, and relates to the technical field of concrete 3D printing, the concrete 3D printer spray head comprises a storage barrel and a nozzle arranged at the bottom of the storage barrel, the side wall of the storage barrel is provided with a feeding pipe and a barrel opening, the top of the storage barrel is detachably connected with a cover plate, the top of the cover plate is fixedly connected with a support, and the support is fixedly connected with the bottom of the storage barrel. A motor is fixedly connected to the top of the support, spiral blades are rotationally connected to the bottom of the cover plate through a rotating rod, the output end of the motor is connected with the upper end of the rotating rod through a coupler, and a filter screen is rotationally connected to the side wall of the rotating rod. According to the concrete 3D printer spray head, fiber agglomerates in concrete can be filtered, meanwhile, the fiber agglomerates can be scattered conveniently, the spray nozzle can be prevented from being blocked, fibers are more uniform, the filtering efficiency and effect are guaranteed, and the 3D printing quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of concrete 3D printing technology, specifically to a concrete 3D printer nozzle. Background Technology

[0002] Concrete 3D printing uses special concrete as raw material, establishes a model using three-dimensional coordinates, and then builds up the concrete material layer by layer to form a rigid building outline. A typical concrete 3D printing system consists of a simulation control unit, a mechanical motion unit, and a raw material mixing and conveying unit. During printing, after the simulation control unit issues commands, the mechanical motion unit performs a closed-loop movement layer by layer according to the established model, while concrete material is continuously conveyed to the designated location. The concrete material is extruded like toothpaste, and then layered up until the printing process is complete. Furthermore, to improve the 3D printing effect, thin strips of glass fiber are usually added to the concrete. The concrete 3D printer nozzle is a crucial component, mainly composed of a storage cylinder, nozzle, feed pipe, cylinder opening, and spiral blades.

[0003] However, in existing concrete 3D printer nozzles, glass fibers tend to clump together during use. If not filtered and cleaned, this can easily clog the nozzles and cause uneven distribution of glass fibers within the concrete, affecting print quality. While a filter screen can be used, it's difficult to clean and break up the fiber clumps. Although this can prevent nozzle clogging, the filter screen's efficiency decreases, making it harder for concrete to pass through. Furthermore, the glass fibers remain uneven, still impacting print quality.

[0004] To address this, we propose a nozzle for a concrete 3D printer. Summary of the Invention

[0005] The purpose of this invention is to provide a concrete 3D printer nozzle to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a concrete 3D printer nozzle, comprising a storage cylinder and a nozzle disposed at the bottom of the storage cylinder, wherein the side wall of the storage cylinder is provided with a feed pipe and a cylinder opening, and a cover plate is detachably connected to the top of the storage cylinder, a bracket is fixedly connected to the top of the cover plate, and a motor is fixedly connected to the top of the bracket, a spiral blade is rotatably connected to the bottom of the cover plate via a rotating rod, and the output end of the motor is connected to the upper end of the rotating rod via a coupling, a filter screen is connected to the rotating rod via a connecting mechanism, and a conical surface is provided at the top of the filter screen, a lifting plate is connected to the bottom of the cover plate via a lifting module, and a rotating ring is rotatably connected to the bottom of the lifting plate via a rotating mechanism, a lifting ring is connected to the bottom of the rotating ring via a telescopic mechanism, and the lifting ring is sleeved on the side wall of the rotating rod, and multiple dispersing mechanisms are provided at the bottom of the lifting ring, and the dispersing mechanisms are used to disperse fiber clumps.

[0007] Preferably, each of the dispersing mechanisms includes a rectangular groove extending through the bottom of the lifting ring, and two symmetrically arranged moving blocks are connected in each rectangular groove through a reset mechanism. Two symmetrically arranged semi-circular rods are fixedly connected to the opposite sidewalls of the two moving blocks, and the lower end of the semi-circular rods is provided with a pointed cone. The sidewalls of the semi-circular rods are provided with hollow grooves, and the movement of the moving blocks is driven by a first pushing mechanism. The hollow grooves ensure that the normal concrete can flow normally and will not be clamped.

[0008] By adopting the above technical solution, the lifting module drives the lifting plate to move downward. When the lifting plate moves downward, the rotating mechanism drives the rotating ring to move downward, and the telescopic mechanism drives the lifting ring to move downward. When the lifting ring moves downward, the reset mechanism drives multiple dispersing mechanisms to move downward. When the pointed cone comes into contact with the fiber bundle, it can penetrate into the fiber bundle and the first pushing mechanism can push the two moving blocks to move away from each other, thereby pulling the fiber bundle apart.

[0009] Preferably, the reset mechanism includes a first sleeve rod fixedly connected to the side wall of each moving block, and a first sleeve is sleeved on the side wall of the first sleeve rod. The other end of the first sleeve is fixed to the side wall of the rectangular groove, and a reset element is provided between the first sleeve rod and the first sleeve.

[0010] By adopting the above technical solution, the movement of the moving block is guided.

[0011] Preferably, the reset component includes a first spring inserted into the first sleeve, and the two ends of the first spring are fixed to the first sleeve rod and the first sleeve, respectively.

[0012] By adopting the above technical solution, the movement of the moving block can be reset.

[0013] Preferably, the first pushing mechanism includes a pushing pin fixedly connected to the top of each moving block, and a plurality of mounting brackets fixedly connected to the bottom of the rotating ring. A plurality of pushing blocks are fixedly connected to the side wall of each mounting bracket. The bottom of the pushing block is provided with an inclined surface, so that the upper end of the pushing pin can slide on the inclined surface.

[0014] By adopting the above technical solution, when the distance between the rotating ring and the lifting ring gradually decreases, the mounting frame can drive the push block to move downward, so that the inclined surface abuts against the upper end of the push pin, thereby pushing the two moving blocks in the same group to move away from each other.

[0015] Preferably, the telescopic mechanism includes two second sleeves fixedly connected to the bottom of the rotating ring, and a third sleeve rod is inserted into each second sleeve. The lower end of the third sleeve rod is fixed to the top of the lifting ring, and the third sleeve rod is fixed to the top of the second sleeve by a third spring.

[0016] By adopting the above technical solution, when the lower end of the cone abuts against the top of the filter screen, the second spring is gradually stretched. When the second spring can be stretched further, as the rotating ring continues to move downward, the second sleeve can slide downward along the side wall of the third sleeve rod, the third spring is gradually compressed, and the distance between the rotating ring and the lifting ring gradually decreases.

[0017] Preferably, the rotating mechanism includes an annular guide rail fixedly connected to the top of the rotating ring, a guide groove is provided at the bottom of the lifting plate, and the annular guide rail rotates within the guide groove. The rotation of the rotating ring is driven by a second pushing mechanism.

[0018] By adopting the above technical solution, the normal rotation of the rotating ring is guaranteed.

[0019] Preferably, the second pushing mechanism includes a fixed plate fixedly connected to the top of the lifting ring, and the side wall of the fixed plate is provided with a sliding groove. The sliding groove includes a first vertical groove connected end to end, a plurality of V-shaped grooves and a second vertical groove. The bottom of the lifting plate is fixedly connected to an installation block, and the side wall of the installation block is fixedly connected to a pushing rod, which can slide in the sliding groove.

[0020] By adopting the above technical solution, when the distance between the rotating ring and the lifting ring gradually decreases, when the lifting plate and the rotating ring move downward, the push rod can be driven to move downward along the slide groove through the mounting block. When the push rod slides downward in the slide groove, it can drive the lifting ring and the rotating ring to reciprocate. At the same time, the annular guide rail slides reciprocally in the guide groove, and the pointed cone can drive the pulled-out fiber clump to reciprocate, which is convenient for breaking up the fiber clump.

[0021] Preferably, the connecting mechanism includes a mounting hole on the top of the filter screen, a rubber ring is fixedly inserted into the mounting hole, an annular groove is formed on the side wall of the rotating rod, the rubber ring is fitted into the annular groove, and the rubber ring and the annular groove are interference fit.

[0022] By adopting the above technical solution, when the filter screen is located in the storage cylinder, under normal conditions, the rotating rod can drive the filter screen to rotate synchronously. When the pointed cone of the semi-circular rod abuts against the filter screen, the filter screen stops rotating, and the rubber ring rotates in the annular groove.

[0023] In summary, Advantage 1: It can filter fiber clumps in concrete, avoiding nozzle clogging; Advantage 2: It makes it easier to clean and break up fiber clumps, which not only avoids nozzle clogging but also makes the fibers more uniform. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional view of the present invention; Figure 3 This is a partial cross-sectional view of the structure at another point in time according to the present invention; Figure 4 This is a schematic diagram of the rotating ring and the lifting ring in this invention; Figure 5 This is a partial cross-sectional view of the first sleeve in this invention; Figure 6 for Figure 3 Enlarged view of point A in the middle; Figure 7 for Figure 4 Enlarged view of section B in the middle.

[0025] In the diagram: 101, storage cylinder; 102, nozzle; 103, feed pipe; 104, cylinder opening; 105, cover plate; 106, rotating rod; 107, spiral blade; 108, bracket; 109, motor; 110, coupling; 201, guide groove; 202, annular guide rail; 301, third sleeve rod; 302, third sleeve rod; 303, third spring; 401, fixing plate; 402, V-groove; 403, first vertical groove; 404, second vertical groove; 405, mounting block; 406 501. Push rod; 502. First sleeve; 503. First spring; 601. Mounting hole; 602. Rubber ring; 603. Annular groove; 701. Push pin; 702. Mounting bracket; 703. Push block; 704. Inclined surface; 10. Hollow groove; 11. Filter screen; 1101. Conical surface; 13. Lifting plate; 14. Lifting module; 15. Rotating ring; 16. Lifting ring; 17. Rectangular groove; 18. Moving block; 19. Semicircular rod; 1901. Pointed cone. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1: Please refer to Figures 1-7The illustration shows a concrete 3D printer nozzle, including a storage cylinder 101 and a nozzle 102 located at the bottom of the storage cylinder 101. The side wall of the storage cylinder 101 is provided with a feed pipe 103 and a cylinder opening 104. The lowest point of the cylinder opening 104 is higher than the highest point of the feed pipe 103 to prevent concrete from entering the cylinder opening 104. A cover plate 105 is detachably connected to the top of the storage cylinder 101. A bracket 108 is fixedly connected to the top of the cover plate 105, and a motor 109 is fixedly connected to the top of the bracket 108. A spiral blade 107 is rotatably connected to the bottom of the cover plate 105 via a rotating rod 106. The output end of the motor 109 is connected to the upper end of the rotating rod 106 via a coupling 110. A filter screen 11 is connected to the rotating rod 106 via a connecting mechanism. The filter screen 11 has a conical surface 1101 at its top, and the bottom of the cover plate 105 is connected to a lifting plate 13 via a lifting module 14. The lifting module 14 is a well-known technology in this field and will not be described in detail here. The bottom of the lifting plate 13 is rotatably connected to a rotating ring 15 via a rotating mechanism. The bottom of the rotating ring 15 is connected to a lifting ring 16 via a telescopic mechanism. The lifting ring 16 is sleeved on the side wall of the rotating rod 106. The bottom of the lifting ring 16 is provided with multiple dispersing mechanisms, which are used to disperse fiber clumps. This can filter fiber clumps in concrete and facilitate the dispersing of fiber clumps. This not only avoids clogging of the nozzle 102 but also makes the fibers more uniform, ensuring the efficiency and effect of filtration and guaranteeing the quality of 3D printing.

[0028] Each dispersing mechanism includes a rectangular groove 17 extending through the bottom of the lifting ring 16. Two symmetrically arranged movable blocks 18 are connected to each rectangular groove 17 via a reset mechanism. Two symmetrically arranged semi-circular rods 19 are fixedly connected to the opposite sidewalls of the two movable blocks 18. The lower end of each semi-circular rod 19 has a pointed cone 1901, positioned above the lowest point of the conical surface 1101, ensuring that the pointed cone 1901 can penetrate into the fiber cluster. The sidewalls of the semi-circular rods 19 have perforated grooves 10. The movement of the movable blocks 18 is driven by a first pushing mechanism. The design ensures that the concrete can flow normally and will not be trapped. The lifting module 14 drives the lifting plate 13 to move downward. When the lifting plate 13 moves downward, the rotating mechanism drives the rotating ring 15 to move downward, and the telescopic mechanism drives the lifting ring 16 to move downward. When the lifting ring 16 moves downward, the reset mechanism drives multiple dispersing mechanisms to move downward. When the cone 1901 comes into contact with the fiber bundle, it can penetrate into the fiber bundle and push the two moving blocks 18 away from each other through the first pushing mechanism, thereby pulling the fiber bundle apart.

[0029] The reset mechanism includes a first sleeve rod 501 fixedly connected to the side wall of each moving block 18, and a first sleeve 502 is sleeved on the side wall of the first sleeve rod 501. The other end of the first sleeve 502 is fixed to the side wall of the rectangular groove 17, and a reset member is provided between the first sleeve rod 501 and the first sleeve 502 to guide the movement of the moving block 18.

[0030] The reset component includes a first spring 503 inserted into the first sleeve 502, and the two ends of the first spring 503 are respectively fixed to the first sleeve rod 501 and the first sleeve 502, which plays a reset role in the movement of the moving block 18.

[0031] The first pushing mechanism includes a push pin 701 fixedly connected to the top of each moving block 18, and a plurality of mounting brackets 702 fixedly connected to the bottom of the rotating ring 15. A plurality of push blocks 703 are fixedly connected to the side wall of each mounting bracket 702. The bottom of the push block 703 is provided with an inclined surface 704, so that the upper end of the push pin 701 can slide on the inclined surface 704. When the distance between the rotating ring 15 and the lifting ring 16 gradually decreases, the push block 703 can be driven to move downward through the mounting bracket 702, so that the inclined surface 704 abuts against the upper end of the push pin 701, thereby pushing the two moving blocks 18 in the same group to move away from each other.

[0032] The telescopic mechanism includes two second sleeves 302 fixedly connected to the bottom of the rotating ring 15, and a third sleeve rod 301 is inserted into each second sleeve 302. The lower end of the third sleeve rod 301 is fixed to the top of the lifting ring 16, and the third sleeve rod 301 is fixed to the top of the second sleeve 302 by a third spring 303. When the lower end of the cone 1901 abuts against the top of the filter screen 11, as the rotating ring 15 continues to move downward, the second sleeve 302 can slide downward along the side wall of the third sleeve rod 301, the third spring 303 is gradually compressed, and the distance between the rotating ring 15 and the lifting ring 16 gradually decreases.

[0033] The rotating mechanism includes an annular guide rail 202 fixedly connected to the top of the rotating ring 15. The bottom of the lifting plate 13 is provided with a guide groove 201, and the annular guide rail 202 rotates in the guide groove 201. The rotation of the rotating ring 15 is driven by the second pushing mechanism to ensure the normal rotation of the rotating ring 15.

[0034] The second pushing mechanism includes a fixed plate 401 fixedly connected to the top of the lifting ring 16, and the side wall of the fixed plate 401 is provided with a sliding groove. The sliding groove includes a first vertical groove 403 connected end to end, multiple V-shaped grooves 402 and a second vertical groove 404. The bottom of the lifting plate 13 is fixedly connected to a mounting block 405, and the side wall of the mounting block 405 is fixedly connected to a push rod 406. The push rod 406 can slide in the sliding groove. When the distance between the rotating ring 15 and the lifting ring 16 gradually decreases, when the lifting plate 13 and the rotating ring 15 move downward, the push rod 406 can be driven to move downward along the sliding groove through the mounting block 405. When the push rod 406 slides downward in the sliding groove, it can push the lifting ring 16 and the rotating ring 15 to reciprocate. At the same time, the annular guide rail 202 reciprocates in the guide groove 201, and can drive the pulled fiber bundle to reciprocate through the pointed cone 1901, which facilitates the dispersal of the fiber bundle.

[0035] The connecting mechanism includes a mounting hole 601 on the top of the filter screen 11, into which a rubber ring 602 is fixedly inserted. The rubber ring 602 has high hardness and a sufficient portion is located within the annular groove 603 to ensure that the filter screen 11 will not tilt when concrete falls onto it. An annular groove 603 is formed on the side wall of the rotating rod 106, and the rubber ring 602 is fitted within it with an interference fit. When the filter screen 11 is located within the storage cylinder 101, under normal conditions, this ensures that the rotating rod 106... When the 06 rotates, the rubber ring 602 can drive the filter screen 11 to rotate synchronously. When the pointed cone 1901 of the semi-circular rod 19 abuts against the filter screen 11, the filter screen 11 stops rotating. At this time, when the rotating rod 106 rotates, it can overcome the squeezing force of the rubber ring 602, so that the rotating rod 106 can continue to rotate. At the same time, the rubber ring 602 rotates in the annular groove 603. The rubber ring 602 is made of wear-resistant rubber material. After long-term use, when the rubber ring 602 is worn or aged, the rubber ring 602 should be replaced.

[0036] Working principle: During use, concrete is conveyed to the storage cylinder 101 through the feed pipe 103 via the conveying pipe. At the same time, the motor 109 is started. When the motor 109 rotates, it can drive the rotating rod 106 and the spiral blade 107 to rotate through the coupling 110. This not only mixes the concrete in the storage cylinder 101, but also the uniformly mixed concrete is extruded through the nozzle 102 under the push of the spiral blade 107 and 3D printed according to the construction drawings.

[0037] Meanwhile, a filter screen 11 is provided on the side wall of the rotating rod 106, which can filter the concrete entering the storage cylinder 101 and filter the fiber clumps. When the rotating rod 106 rotates, the filter screen 11 can be rotated through the connecting mechanism. Under the action of the conical surface 1101 and centrifugal force, the fiber clumps can slide to the lowest point of the conical surface 1101. Then, the lifting module 14 drives the lifting plate 13 to move downward. When the lifting plate 13 moves downward, the rotating mechanism drives the rotating ring 15 to move downward, and the telescopic mechanism drives the lifting ring 16 to move downward. When the lifting ring 16 moves downward, the reset mechanism drives multiple dispersing mechanisms to move downward. When the pointed cone 1901 abuts against the fiber clump, it can penetrate into the fiber clump.

[0038] When the lower end of the cone 1901 abuts against the top of the filter screen 11, as the rotating ring 15 continues to move downward, the second sleeve 302 slides downward along the side wall of the third sleeve rod 301, the third spring 303 is gradually compressed, and the distance between the rotating ring 15 and the lifting ring 16 gradually decreases. At the same time, the mounting bracket 702 drives the push block 703 to move downward, so that the inclined surface 704 abuts against the upper end of the push pin 701, thereby pushing the two moving blocks 18 of the same group to move away from each other. The first spring 503 is compressed and drives the two semi-circular rods 19 to move away from each other through the second reset mechanism, thereby pulling the fiber clumps apart.

[0039] Furthermore, when the lifting plate 13 and the rotating ring 15 move downwards, the mounting block 405 drives the push rod 406 to move downwards along the slide groove. When the push rod 406 slides downwards in the slide groove, it can push the lifting ring 16 and the rotating ring 15 to reciprocate. At the same time, the annular guide rail 202 slides reciprocally in the guide groove 201, and the pointed cone 1901 drives the pulled fiber bundle to reciprocate, which is convenient for breaking up the fiber bundle. After breaking up, the two moving blocks 18 can move and reset under the action of the first spring 503, which is convenient for breaking up the fiber bundle. This not only avoids the nozzle 102 from being blocked, but also makes the fibers more uniform and ensures the quality of 3D printing.

[0040] Next, the lifting module 14 drives the lifting plate 13 and the rotating ring 15 to move upward and reset. At the same time, it can drive the lifting ring 16 to move upward and reset, and then drive the semi-circular rod 19 to move upward and reset. When the cone 1901 disengages from the filter screen 11, when the rotating rod 106 rotates, it can drive the filter screen 11 to rotate through the connecting mechanism, thereby changing the position of the fiber clump. Then, the lifting module 14 drives the lifting plate 13 to move downward again. This process is repeated to break up the fiber clump multiple times.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concrete 3D printer nozzle, comprising a nozzle (102), a cover plate (105), a rotating rod (106), and a spiral blade (107) disposed on a material storage cylinder (101), characterized in that, The rotating rod (106) is connected to a filter screen (11) via a connecting mechanism, and the top of the filter screen (11) is provided with a conical surface (1101). The bottom of the cover plate (105) is connected to a lifting plate (13) via a lifting module (14), and the bottom of the lifting plate (13) is rotatably connected to a rotating ring (15) via a rotating mechanism. The bottom of the rotating ring (15) is connected to a lifting ring (16) via a telescopic mechanism, and the lifting ring (16) is sleeved on the side wall of the rotating rod (106). The bottom of the lifting ring (16) is provided with multiple dispersing mechanisms, and the dispersing mechanisms are used to disperse the fiber clumps.

2. The nozzle for a concrete 3D printer according to claim 1, characterized in that: Each of the dispersing mechanisms includes a rectangular groove (17) extending through the bottom of the lifting ring (16), and two symmetrically arranged moving blocks (18) are connected in each rectangular groove (17) through a reset mechanism. Two symmetrically arranged semi-circular rods (19) are fixedly connected to the opposite side walls of the two moving blocks (18), and the lower end of the semi-circular rods (19) is provided with a pointed cone (1901). The side walls of the semi-circular rods (19) are provided with hollow grooves (10), and the movement of the moving blocks (18) is driven by a first pushing mechanism.

3. The nozzle for a concrete 3D printer according to claim 2, characterized in that: The reset mechanism includes a first sleeve rod (501) fixedly connected to the side wall of each movable block (18), and a first sleeve tube (502) is sleeved on the side wall of the first sleeve rod (501). The other end of the first sleeve tube (502) is fixed to the side wall of the rectangular groove (17), and a reset member is provided between the first sleeve rod (501) and the first sleeve tube (502).

4. A concrete 3D printer nozzle according to claim 2, characterized in that: The reset component includes a first spring (503) inserted into the first sleeve (502), and the two ends of the first spring (503) are fixed to the first sleeve rod (501) and the first sleeve (502) respectively.

5. A concrete 3D printer nozzle according to claim 2, characterized in that: The first pushing mechanism includes a push pin (701) fixedly connected to the top of each moving block (18), and a plurality of mounting brackets (702) fixedly connected to the bottom of the rotating ring (15). A plurality of push blocks (703) are fixedly connected to the side wall of each mounting bracket (702). The bottom of the push block (703) is provided with an inclined surface (704) so ​​that the upper end of the push pin (701) can slide on the inclined surface (704).

6. A concrete 3D printer nozzle according to claim 1, characterized in that: The telescopic mechanism includes two second sleeves (302) fixedly connected to the bottom of the rotating ring (15), and a third sleeve rod (301) is inserted in each second sleeve (302). The lower end of the third sleeve rod (301) is fixed to the top of the lifting ring (16), and the third sleeve rod (301) is fixed to the top of the second sleeve (302) by a third spring (303).

7. A concrete 3D printer nozzle according to claim 1, characterized in that: The rotating mechanism includes an annular guide rail (202) fixedly connected to the top of the rotating ring (15), and a guide groove (201) is provided at the bottom of the lifting plate (13), and the annular guide rail (202) rotates in the guide groove (201). The rotation of the rotating ring (15) is driven by the second pushing mechanism.

8. A concrete 3D printer nozzle according to claim 7, characterized in that: The second pushing mechanism includes a fixed plate (401) fixedly connected to the top of the lifting ring (16), and the side wall of the fixed plate (401) is provided with a sliding groove. The sliding groove includes a first vertical groove (403) connected end to end, a plurality of V-shaped grooves (402) and a second vertical groove (404). The bottom of the lifting plate (13) is fixedly connected to a mounting block (405), and the side wall of the mounting block (405) is fixedly connected to a push rod (406), and the push rod (406) can slide in the sliding groove.

9. A concrete 3D printer nozzle according to claim 1, characterized in that: The connecting mechanism includes a mounting hole (601) on the top of the filter screen (11), a rubber ring (602) is fixedly inserted in the mounting hole (601), and an annular groove (603) is provided on the side wall of the rotating rod (106). The rubber ring (602) is fitted in the annular groove (603) and the rubber ring (602) and the annular groove (603) are interference fit.

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