Synchronous printing cement mortar 3D printing nozzle and accessory device thereof

Abstract

The invention relates to a synchronous printing cement mortar 3D printing spray head and an accessory device thereof. The synchronous printing cement mortar 3D printing spray head comprises the following structures that a translation lifting mechanism is composed of a lifting motor and a lifting screw rod, a translation motor and symmetrically-arranged translation wheels are installed on the side wall, the translation wheels are wrapped with translation belts and connected with a translation plate, and a material preparation mechanism and a printing mechanism are arranged at the end of the translation plate; the material preparation mechanism is a big-end-up material preparation box, a plurality of separation blades are arranged in the material preparation box to form a material preparation bin, rotatable pre-stirring paddles are arranged on the separation blades to conduct immediate stirring, and a one-way valve and an L-shaped conveying pipe are arranged at the bottom of the material preparation mechanism; the printing mechanism comprises a transfer device and a C-shaped feeding pipe connected with the transfer device, a three-way shaft and a T-shaped three-way cavity are arranged in the transfer device, a three-way pin is connected with a three-way air cylinder to achieve pipeline opening and closing, the tail end of the feeding pipe is connected with a material injection gun, the top of the feeding pipe is provided with a material injection air cylinder capable of being independently controlled, the tail end of the feeding pipe is provided with a rotatable material injection paddle, and pressure difference is manufactured for material injection printing. And the mortar 3D printing efficiency, stability and printing quality are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing, and in particular relates to a synchronously printed cement mortar 3D printing nozzle and an auxiliary device thereof. Background Art

[0002] With the continuous development of the construction industry, 3D printing technology is increasingly used in construction, especially in the 3D printing of concrete and mortar. This technology greatly improves the efficiency and flexibility of construction by delivering concrete or mortar mixtures to the printing nozzle and printing layer by layer according to a pre-designed path. However, the existing cement mortar 3D printing technology still faces many challenges, especially in terms of the open time and interlayer adhesion of the printing material. The open time of cement mortar refers to the time from the completion of mixing to the loss of printability. During this period of time, the fluidity and plasticity of the mortar are sufficient to support 3D printing operations. However, most of the current 3D printing equipment is a single nozzle, which cannot achieve synchronous printing of multiple layers of materials. This results in a long printing interval between layers during the printing process due to the limitation of the open time, resulting in a weakening of the interlayer adhesion. The interlayer adhesion is an important factor affecting the bearing capacity of the building structure. If the adhesion is insufficient, it may lead to the fragility and instability of the structure, thereby affecting the overall safety of the building.

[0003] In addition, most existing 3D printing technologies use the "contour process". Although this process does not require a mold, in actual applications, the outline of the printed building may not meet the needs of complex designs. Especially when a combination of multiple materials is required, the limitation of a single nozzle makes it difficult to achieve material diversity and functionality. This not only limits the flexibility of architectural design, but also affects the functionality and aesthetics of the building, becoming an urgent problem in the industry that needs to be solved. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a synchronously printed cement mortar 3D printing nozzle and its auxiliary device, and the specific technical solution is as follows:

[0005] The present invention provides a synchronously printed cement mortar 3D printing nozzle and its accessory device, which comprises a main frame carrying a covering belt mechanism and a translation and lifting mechanism, the covering belt mechanism comprises a covering conveying roller driven by a covering conveying motor, on which a covering conveying belt is wrapped, the translation and lifting mechanism comprises a lifting screw connected to a vertically arranged lifting motor, on which an "L"-shaped lifting frame is passed, which can perform vertical reciprocating motion with the rotation of the screw, a translation motor is inserted into the side wall of the lifting frame, and a translation wheel is sleeved at the end thereof, the translation wheel is symmetrically arranged along the main frame, and a translation beam is sandwiched therebetween, a translation belt is wrapped around the outer periphery of the translation wheel, and a translation plate is coupled and connected thereto, a material preparation mechanism and a printing mechanism are arranged at the end of the translation plate, and can perform horizontal movement with the rotation of the translation belt;

[0006] The material preparation mechanism comprises a material preparation box which is larger at the top and smaller at the bottom, wherein a plurality of partition leaves are intermittently inserted in the material preparation box, and a material preparation bin for storing cement mortar is formed between the plurality of partition leaves and the inner wall of the box, and a plurality of rotatable pre-mixing paddles are pierced on the partition leaves for instant mixing of cement mortar, and the ends of the pre-mixing paddles extending out of the side walls of the box are respectively sleeved with co-rotating belts in succession, and a co-rotating motor sleeved and driven by the co-rotating motor embedded in the side walls of the box can rotate with the co-rotating belt to pull the plurality of pre-mixing paddles for synchronous mixing and mixing, a one-way valve is independently buried at the bottom of the material preparation bin, and an "L"-shaped conveying pipe is extended forwardly therefrom, which can be opened instantly to convey the material as the pressure in the pipeline changes;

[0007] The printing mechanism includes a transferor connected to the conveying pipe, a "C"-shaped feeding pipe is connected to the bottom of the transferor, a three-way shaft is transversely embedded in the transferor, the three-way shaft is provided with a "T"-shaped three-way cavity adapted to the pipe mouth, a three-way pin is clamped on the end extending out of the transferor, and a three-way cylinder pushing part is fixed to the bottom wall of the material preparation box and connected to the three-way pin, and the pipeline of the three-way cavity can be opened and closed as the three-way cylinder is extended and rotated, an injection gun is connected to the end of the feeding pipe, and a downward independently controllable injection cylinder is suspended on the top of the feed pipe, and a rotatable injection paddle is provided at the end of the injection cylinder, which can rotate downward with the injection paddle to create a pressure difference for injection printing.

[0008] As a preferred technical solution of the present invention, the printing mechanism includes a filling cylinder suspended at the front of the material preparation box, with multiple filling plungers at the end thereof, and the filling plungers are respectively inserted with filling tubes, and the bottoms thereof are connected to the transfer device, which can be reciprocated and lifted up and down with the filling plungers to suck in a fixed amount of preparation material for filling and printing.

[0009] As a preferred technical solution of the present invention, the pre-mixing paddle is distributed in an inverted triangle shape, and is radially arranged with multiple sections of evenly distributed spirally undulating flip blades. Behind the flip blades are three obliquely inserted stirring blades, which can promote the mixing of cement mortar as the pre-mixing paddle rotates, and at the end thereof are arranged annular rectangular co-rotating teeth adapted to the co-rotating belt, which can transmit accurately along with the co-rotating belt.

[0010] As a preferred technical solution of the present invention, the injection paddle is radially provided with spirally opening injection blades, the center of which is provided with a square mixing arm, which can discharge cement mortar while the injection paddle rotates and falls.

[0011] As a preferred technical solution of the present invention, the translation lifting mechanism includes a plurality of sets of elastic cooperative wheels arranged in a triangular shape, which clamp the main frame and move smoothly by being fixed by opposite extrusion.

[0012] As a preferred technical solution of the present invention, the top wall of the material preparation box is provided with a quick-release groove adapted to the dividing leaves, and an oblique chamfer is opened along the upper section, so that the dividing leaves can be quickly disassembled and assembled according to different situations.

[0013] As a preferred technical solution of the present invention, a disassembly-free slideway is set at the rear end bend of the conveying belt, which is clearance-matched with the loosening belt and is used to receive the printed product conveyed to the bend, thereby avoiding manual demolding.

[0014] As a preferred technical solution of the present invention, a horizontally laid square top plate is arranged inside the conveyor belt, which is gap-matched with the top wall of the conveyor belt, and a plurality of inverted umbrella-shaped adjustment disks are arranged at the four corners of the bottom surface of the top plate, and the protrusions thereof are embedded in the top plate and are sleeved with springs, so that the top plate can be raised and lowered in a balanced manner by rotating the adjustment disk.

[0015] As a preferred technical solution of the present invention, the main frame includes a gantry frame that can slide longitudinally with respect to the main frame, and is used for maintenance of the printing mechanism.

[0016] As a preferred technical solution of the present invention, a control switch is provided on the side of the main frame, which can instantly control the opening and closing of the printing mechanism.

[0017] The beneficial effects of the present invention are:

[0018] In view of the problems existing in the existing cement mortar 3D printing technology, such as short open time, insufficient interlayer bonding, low printing efficiency and unstable material transportation, the present invention provides an efficient and stable solution through the coordinated optimization of material preparation, transportation and printing mechanisms, which has the following beneficial effects:

[0019] First, in the material preparation stage, the present invention divides the mortar into multiple independent material preparation bins through the design of a material preparation box with a large top and a small bottom and the use of internal partition leaves, effectively avoiding the problems of mortar accumulation and stratification, and ensuring the uniformity and fluidity of the mortar. The pre-stirring paddles set on the partition leaves achieve synchronous stirring through the co-rotating belt and the co-rotating motor, and can mix the mortar immediately before printing, avoiding the problem of material deposition and hardening. It not only improves the stirring efficiency of the mortar, but also prolongs its open time, so that the mortar maintains good fluidity and plasticity during the printing process, and solves the problem of decreased adhesion between printing layers due to insufficient open time in traditional equipment.

[0020] Secondly, in terms of material transportation, the one-way valve at the bottom of the material preparation bin and the "L"-shaped delivery pipe can realize instant delivery according to the pressure changes in the pipeline, ensuring the continuous feeding and delivery stability of the mortar. The design of the one-way valve effectively prevents the mortar from flowing back or blocking, improving the delivery efficiency and system reliability. At the same time, the optimized design of the delivery pipeline reduces the residence time of the mortar during the transmission process, shortens the printing interval between layers, thereby enhancing the inter-layer bonding force and improving the overall strength and stability of the printed components.

[0021] During the printing stage, this technology achieves precise control of the mortar flow direction through the innovative design of the transfer device and the three-way shaft. The "T"-shaped three-way cavity inside the three-way shaft is adapted to the pipe mouth, and the pipe is flexibly opened and closed through the telescopic action of the three-way cylinder, ensuring that the mortar can be delivered to the printing mechanism as needed, avoiding material waste and insufficient supply. The injection gun combines the spiral lifting design of the injection cylinder and the injection paddle to achieve uniform and stable injection printing by creating a pressure difference, further improving the printing accuracy and interlayer bonding quality, while avoiding the problem of material breakage and blockage caused by uneven supply in the traditional printing process.

[0022] In addition, the design of the translation and lifting mechanism enables the print head to have full range of motion capabilities. The combination of the lifting screw and the translation belt enables the print head to move flexibly in the three directions of X, Y, and Z to meet the printing needs of complex geometric shapes. This flexibility not only improves printing efficiency, but also reduces the construction complexity caused by the limited range of motion in traditional printing equipment.

[0023] In summary, the present invention significantly improves the efficiency, stability and printing quality of mortar 3D printing by comprehensively optimizing the material preparation, transportation and printing links, solves the key pain points in the prior art, and has broad application value and promotion potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall structural diagram of the present invention is shown;

[0025] Figure 2 It shows a schematic structural diagram of the combination of the conveying mechanism and the translation lifting mechanism in the present invention;

[0026] Figure 3 A schematic diagram of the three-dimensional structure of the translation lifting mechanism in the present invention is shown;

[0027] Figure 4 A schematic diagram showing the structure of the material preparation mechanism and the printing mechanism combined in the present invention is shown;

[0028] Figure 5 A schematic diagram of the three-dimensional structure of the material preparation box in the present invention is shown;

[0029] Figure 6A schematic diagram of the three-dimensional structure of the stirring paddle in the present invention is shown;

[0030] Figure 7 A three-dimensional structural schematic diagram of the printing mechanism in the present invention is shown;

[0031] Figure 8 The three-dimensional structure schematic diagram of the three-way shaft in the present invention is shown;

[0032] Fig. 9 A schematic diagram of the three-dimensional structure of the transfer device in the present invention is shown;

[0033] Fig.10 A schematic diagram of the three-dimensional structure of the injection paddle in the present invention is shown;

[0034] Fig.11 A schematic diagram of the three-dimensional structure of the adjustment disk in the present invention is shown;

[0035] As shown in the figure: 1. Main frame; 11. Gantry; 2. Covering belt mechanism; 21. Covering motor; 22. Covering roller; 23. Adjusting plate; 231. Protrusion; 24. Covering belt; 241. Top plate; 25. Spring; 3. Translation lifting mechanism; 31. Lifting motor; 32. Lifting screw rod; 33. Lifting frame; 34. Translation motor; 35. Translation beam; 36. Translation wheel; 37. Translation belt; 38. Coordinating wheel; 4. Material preparation mechanism; 41. Material preparation box; 411. Material preparation bin; 412. Partition leaf; 413. One-way valve; 4 14. Quick-release slot; 42. Co-rotating motor; 43. Co-rotating belt; 44. Pre-stirring paddle; 441. Co-rotating gear; 442. Flip blade; 443. Stirring blade; 5. Printing mechanism; 51. Filling cylinder; 52. Filling tube; 53. Filling plunger; 54. Transfer device; 541. Three-way pin; 542. Three-way shaft; 5421. Three-way cavity; 55. Three-way cylinder; 56. Injection cylinder; 57. Injection paddle; 571. Injection blade; 572. Mixing arm; 58. Injection gun; 59. Feeding pipe; 6. Control switch; 7. Disassembly-free slideway. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] Embodiment 1

[0038] In order to solve the technical problems in the background technology, the following synchronous printing cement mortar 3D printing nozzle and its auxiliary device are provided:

[0039] Combination Figure 1-9As shown, a synchronously printed cement mortar 3D printing nozzle and its auxiliary device, which includes a main frame 1 carrying a coating mechanism 2 and a translation and lifting mechanism 3, the coating mechanism 2 includes a coating roller 22 driven by a coating motor 21, on which a coating belt 23 is wrapped, the translation and lifting mechanism 3 includes a lifting screw 32 connected to a vertical lifting motor 31, on which an "L"-shaped lifting frame 33 is passed, which can perform vertical reciprocating motion with the rotation of the screw, a translation motor 34 is inserted into the side wall of the lifting frame 33, and a translation wheel 36 is sleeved at the end thereof, the translation wheel 36 is symmetrically arranged along the main frame 1, and a translation beam 35 is sandwiched therebetween, the outer periphery of the translation wheel 36 is wrapped with a translation belt 37, on which a translation plate is coupled and connected, and a material preparation mechanism 4 and a printing mechanism 5 are provided at the end of the translation plate, which can perform horizontal movement with the rotation of the translation belt 37;

[0040] The material preparation mechanism 4 includes a material preparation box 41 which is larger at the top and smaller at the bottom. A plurality of partition leaves 412 are intermittently inserted in the material preparation box 41. A material preparation bin 411 for storing cement mortar is formed between the plurality of partition leaves 412 and the inner wall of the box. A plurality of rotatable pre-mixing paddles 44 are pierced on the partition leaves 412 for instant mixing of cement mortar. The ends of the pre-mixing paddles 44 extending out of the side wall of the box are successively sleeved with co-rotating belts 43, and a co-rotating motor 42 embedded in the side wall of the box is sleeved for transmission, which can rotate with the co-rotating belt 43 to pull the plurality of pre-mixing paddles 44 for synchronous mixing and mixing. A one-way valve 413 is independently buried at the bottom of the material preparation bin 411, and an "L"-shaped conveying pipe is extended forward from the bottom thereof, which can be opened instantly to convey the material as the pressure in the pipeline changes;

[0041] The printing mechanism 5 includes a transferor 54 connected to the conveying pipe, a "C"-shaped feeding pipe 59 is connected to the bottom of the transferor 54, a three-way shaft 542 is transversely embedded in the transferor 54, and the three-way shaft 542 is provided with a "T"-shaped three-way cavity 5421 adapted to the pipe mouth, and the end extending out of the transferor 54 is clamped with a three-way pin 541, and a three-way cylinder 55 pushing part is fixed to the bottom wall of the preparation box 41 and connected to the three-way pin 541, and the pipeline of the three-way cavity 5421 can be opened and closed as the three-way cylinder 55 is extended and rotated, and the end of the feeding pipe 59 is connected to an injection gun 58, and a downward independently controllable injection cylinder 56 is suspended on the top, and a rotatable injection paddle 57 is provided at the end of the injection cylinder 56, which can rotate downward with the injection paddle 57 to create a pressure difference for injection printing.

[0042] Through the above technical solution, firstly, in the material preparation link, the technical solution divides the mortar into multiple independent material preparation bins 411 through the design of the material preparation box 41 with a large top and a small bottom and the use of internal partition leaves 412, effectively avoiding the problem of mortar accumulation and stratification, and ensuring the uniformity and fluidity of the mortar. The pre-stirring paddle 44 set on the partition leaf 412 realizes synchronous stirring through the co-rotating belt 43 and the co-rotating motor 42, and can mix the mortar immediately before printing, avoiding the problem of material deposition and hardening. It not only improves the stirring efficiency of the mortar, but also prolongs its open time, so that the mortar maintains good fluidity and plasticity during the printing process, and solves the problem of decreased adhesion between printing layers due to insufficient open time in traditional equipment.

[0043] Secondly, in terms of material transportation, the one-way valve 413 at the bottom of the material preparation bin 411 and the "L"-shaped delivery pipe can realize instant transportation according to the pressure changes in the pipeline, ensuring the continuous feeding and transportation stability of the mortar. The design of the one-way valve 413 effectively prevents the mortar from flowing back or blocking, improving the transportation efficiency and system reliability. At the same time, the optimized design of the delivery pipeline reduces the residence time of the mortar during the transmission process, shortens the printing interval between layers, thereby enhancing the inter-layer bonding force and improving the overall strength and stability of the printed component.

[0044] During the printing stage, this technical solution achieves precise control of the mortar flow direction through the innovative design of the transfer device 54 and the three-way shaft 542. The "T"-shaped three-way cavity 5421 inside the three-way shaft 542 is adapted to the pipe port, and the pipe is flexibly opened and closed through the telescopic action of the three-way cylinder 55, ensuring that the mortar can be delivered to the printing mechanism 5 as needed, avoiding material waste and insufficient supply. The injection gun 58 combines the spiral lifting design of the injection cylinder 56 and the injection paddle 57 to achieve uniform and stable injection printing by creating a pressure difference, further improving the printing accuracy and interlayer bonding quality, while avoiding the problem of material breakage and blockage caused by uneven supply in the traditional printing process.

[0045] In addition, the design of the translation and lifting mechanism 3 enables the print head to have full range of motion capabilities. The cooperation of the lifting screw 32 and the translation belt 37 enables the print head to move flexibly in the three directions of X, Y, and Z to meet the printing needs of complex geometric shapes. This flexibility not only improves printing efficiency, but also reduces the construction complexity caused by the limited range of motion in traditional printing equipment.

[0046] In summary, this technical solution significantly improves the efficiency, stability and printing quality of mortar 3D printing by comprehensively optimizing the material preparation, transportation and printing links, solves the key pain points in the existing technology, and has broad application value and promotion potential.

[0047] As a preferred embodiment, the top wall of the material preparation box 41 is provided with a quick-release groove 414 adapted to the dividing leaf, and an oblique chamfer is opened along the upper section, so that the dividing leaf 412 can be quickly disassembled and assembled according to different situations.

[0048] As a preferred embodiment, the conveying mechanism and the translation lifting mechanism 3 are combined in a moving mode such that the gantry 11 is matched with a multi-axis screw rod for reciprocating movement.

[0049] As a preferred embodiment, the injection gun prints the lower layer first, followed by the middle layer, and finally the upper layer, and can be switched to multiple gun nozzles to discharge materials simultaneously to achieve synchronous printing of multiple cement mortars.

[0050] Embodiment 2

[0051] like Figure 1-5 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0052] In this embodiment, the printing mechanism 5 includes a filling cylinder 51 suspended at the front of the material preparation box 41, and a plurality of filling plungers 53 are arranged at the end thereof. The filling plungers 53 are respectively inserted with filling tubes 52, and the bottoms thereof are connected to the transfer device 54, which can be reciprocated and lifted up and down with the filling plungers 53 to suck in a certain amount of preparation material for filling and printing.

[0053] The pre-mixing paddle 44 is distributed in an inverted triangle shape, and is radially provided with a plurality of evenly distributed spirally undulating turning blades 442. Behind the turning blades 442 are three obliquely inserted stirring blades 443, which can promote the mixing of cement mortar as the pre-mixing paddle 44 rotates, and at the end thereof are provided with an annular rectangular co-rotating tooth 441 adapted to the co-rotating belt 43, which can transmit accurately along with the co-rotating belt 43.

[0054] The injection paddle 57 is radially provided with spirally opening injection blades 571, and a square mixing arm 572 is provided in the middle thereof, which can discharge cement mortar while the injection paddle 57 rotates and falls.

[0055] This embodiment provides an improved cement mortar 3D printing device, which overcomes the problems of uneven mortar mixing, unstable feeding and insufficient printing accuracy in the prior art by optimizing the material preparation, mixing, feeding and printing links.

[0056] In the material preparation stage, the device is equipped with a pre-mixing paddle 44 with an inverted triangle distribution, and a plurality of spiral undulating turning blades 442 are arranged radially, which can fully turn over and mix the cement mortar during the rotation process. At the same time, three obliquely inserted stirring blades 443 are arranged behind the turning blades 442 to further enhance the mixing effect of the mortar and ensure that the mortar meets the uniformity and fluidity requirements during the material preparation stage. The pre-mixing paddle 44 is precisely connected to the co-rotating belt 43 through the annular rectangular co-rotating teeth 441 at the end, which can realize synchronous and efficient stirring transmission, avoiding the mortar stratification or deposition caused by unstable transmission in the traditional stirring process.

[0057] In the feeding process, the device sets a packing cylinder 51 at the front of the material preparation box 41, and multiple packing plungers 53 are installed at the end. The plungers cooperate with the packing tube 52 to achieve quantitative suction and delivery of mortar through reciprocating lifting and lowering. The design of the packing plunger 53 makes the feeding amount uniform and accurate each time, avoiding the common problems of over- or under-feeding in traditional feeding methods, ensuring the continuity of the printing process and the stability of mortar supply. At the same time, the bottom of the packing tube 52 is connected to the transfer device 54, which simplifies the transportation path of mortar from material preparation to printing, reduces the material retention time, and improves printing efficiency and interlayer adhesion.

[0058] In the printing process, the device uses an injection paddle 57 with a spiral involute injection blade 571, which creates a pressure difference by rotating and falling, ensuring that the mortar flows out evenly and prints accurately. The square mixing arm 572 in the middle of the injection paddle 57 further optimizes the fluidity of the mortar and avoids blockage and material interruption. The spiral falling action of the injection paddle 57 realizes the uniform discharge and layer-by-layer stacking of the mortar, significantly improving the printing accuracy and interlayer bonding quality.

[0059] In summary, this embodiment significantly improves the efficiency, stability and component quality of cement mortar 3D printing by optimizing the entire process of material preparation, feeding and printing.

[0060] As a preferred embodiment, the filler cylinder 52 can be externally connected to different component materials and cooperate with the injection gun 58 to perform synchronous printing of the mixed components.

[0061] Embodiment 3

[0062] like Figure 1-11 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0063] In this embodiment, a non-disassembly slideway 7 is provided at the rear end bend of the conveying belt 24, which is clearance-matched with the loosening belt and is used to receive the printed product conveyed to the bend, thereby avoiding manual demolding.

[0064] A horizontally laid square top plate 241 is set inside the conveyor belt 24, which is gapped with the top wall of the conveyor belt 24, and a plurality of inverted umbrella-shaped adjustment disks 23 are arranged at the four corners of the bottom surface of the top plate 241. The protrusions 231 are embedded in the top plate 241 and are sleeved with springs 25. The top plate 241 can be raised and lowered in a balanced manner by rotating the adjustment disks 23.

[0065] The translation lifting mechanism 3 includes a plurality of sets of elastic cooperative wheels 38 arranged in a triangular shape, which clamp the main frame 1 and move smoothly by being fixed by opposite extrusion.

[0066] Through the above technical solution, this embodiment provides an improved cement mortar 3D printing device, which effectively solves the problem of low printing accuracy in the prior art by optimizing the conveying, support and motion control systems, and significantly improves the quality and stability of printed components.

[0067] In the finished product conveying link, the device is designed with a conveyor belt 24 structure, and a non-disassembly slideway 7 is set at the rear end bend to receive the printed finished product conveyed to the bend. The slideway and the conveyor belt 24 maintain a clearance fit, so that the finished product can be smoothly received and separated from the conveyor belt when it is conveyed to the bend position, without the need for manual demolding. This design helps to improve the efficiency of transporting printed products, without having to wait for the 3D printing cement mortar to harden before transporting it, and allows the printer to operate continuously, avoiding the problem of finished product deformation and damage caused by manual disassembly, while improving the automation and efficiency of the printing process.

[0068] In the support link, a horizontally laid square top plate 241 is set up inside the conveyor belt 24 to provide a flat printing base. The top plate 241 and the top wall of the conveyor belt 24 are kept in clearance, and a plurality of inverted umbrella-shaped adjustment disks 23 are set at the four corners of the bottom of the top plate 241. The raised portion 231 of the adjustment disk 23 is embedded in the top plate 241, and the support force is provided by the spring 25. By rotating the adjustment disk 23, the height and horizontal state of the top plate 241 can be accurately adjusted to ensure the flatness and horizontality of the printed base. This design effectively avoids the problems of inter-layer offset and structural deformation caused by the uneven base during printing, and significantly improves the printing accuracy.

[0069] In the motion control link, the translation and lifting mechanism 3 adopts a structure of multiple sets of triangularly clamped elastic cooperative wheels 38, which realizes stable translation and lifting motion by clamping and extruding the main frame 1. The elastic design of the cooperative wheel 38 can effectively absorb vibration and impact during the movement, ensuring that the movement trajectory of the print head in three-dimensional space is smooth and accurate. This design avoids the problem of printing path deviation caused by unstable movement, thereby further improving the accuracy and surface quality of the printed component.

[0070] In summary, this embodiment successfully solves the problem of low printing accuracy in the prior art by optimizing the design of finished product transportation, printing base adjustment and motion control system, and provides reliable technical support for high-quality cement mortar 3D printing.

[0071] Embodiment 4

[0072] like Figure 1 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0073] In this embodiment, a three-layer cement mortar is printed simultaneously, and the amounts of the various materials of the cement mortar are: 800g of cement, 100g of silica fume, 100g of fly ash, 1500g of sand, 340g of water, and 5ml of water reducer, 1ml of retarder, and 2g of thickener are added at the same time.

[0074] The specific printing steps are as follows:

[0075] S1: Prepare cement mortar mixtures, namely cement mortar 1, cement mortar 2, and cement mortar 3;

[0076] S2: injecting cement mortar mixture into the material preparation bin 1, material preparation bin 2 and material preparation bin 3 within the opening time, and simultaneously starting the filling cylinder 51 in the material input channel;

[0077] S3: Material preparation bin 1 and its connected injection gun 1, material preparation bin 2 and its connected injection gun 2, material preparation bin 3 and its connected injection gun 3 are arranged from bottom to top, and the adjustable injection guns 1, 2 and 3 all use circular nozzles with a diameter of 20 mm;

[0078] S4: cement mortar mixtures 1, 2, and 3 are extruded through injection gun 1, injection gun 2, and injection gun 3 respectively, and the moving speed of injection guns 1, 2, and 3 is adjusted to 75 mm / s;

[0079] S5: a 3D printed cement mortar layer having a three-layer composite structure can be simultaneously printed out, and the materials of the three-layer composite structure are cement mortar 1, cement mortar 2, and cement mortar 3 from bottom to top.

[0080] Embodiment 5

[0081] like Figure 1 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0082] In this embodiment, a 4-layer synchronous printing is implemented, where the 1st layer is cement mortar, the 2nd layer is cement mortar, the 3rd layer is sound insulation cement mortar (with foaming agent added to form foam concrete), and the 4th layer is thermal insulation cement mortar (with thermal insulation materials, vitrified microspheres, perlite, etc. added).

[0083] A 3D printed cement mortar structure with a 4-layer structure is simultaneously printed, which includes cement mortar layer 1, cement mortar layer 2, sound insulation layer, and thermal insulation layer from bottom to top.

[0084] The components of the sound insulation cement mortar are: 800g cement, 100g silica fume, 100g fly ash, 1500g sand, 340g water, and 16g foaming agent, 5ml water reducer, 1ml retarder, and 2g thickener.

[0085] The components of the thermal insulation cement mortar are: 800g cement, 100g silica fume, 100g fly ash, 1500g sand, 340g water, while adding perlite to replace 30% of the volume of sand, 5ml water reducer, 1ml retarder, and 2g thickener.

[0086] The specific printing steps are as follows:

[0087] S1: Prepare cement mortar mixtures, namely cement mortar 1, cement mortar 2, sound insulation cement mortar, and thermal insulation cement mortar;

[0088] S2: Cement mortar 1, cement mortar 2, sound insulation cement mortar, thermal insulation cement mortar pass through preparation bin 1, preparation bin 2, preparation bin 3, preparation bin 4 during the opening time, and at the same time start the filling cylinder 51 in the material input channel;

[0089] S3: preparation bin 1 and its connected injection gun 1, preparation bin 2 and its connected injection gun 2, preparation bin 3 and its connected injection gun 3, preparation bin 4 and its connected injection gun 4 are arranged from bottom to top, and the nozzle structures 1, 2, 3, and 4 of the adjustable injection gun 58 all adopt square nozzles, and the size of the square nozzle is 30mm×30mm;

[0090] S4: cement mortar 1, cement mortar 2, sound insulation cement mortar, thermal insulation cement mortar are extruded through injection gun 1, injection gun 2, injection gun 3, injection gun 4 respectively, and the moving speed of injection guns 1, 2, 3, 4 is adjusted to 75 mm / s;

[0091] S5: a 3D printed cement mortar layer with a 4-layer composite structure can be printed out one by one, and the materials of the 4-layer composite structure are cement mortar 1, cement mortar 2, sound insulation cement mortar, and thermal insulation cement mortar from bottom to top.

[0092] The working principle and use process of the present invention:

[0093] 1. Material preparation stage

[0094] Cement mortar is added to the preparation bin 411, and the pre-stirring paddles 44 with inverted triangle distribution installed on the partition leaf 412 are used to stir and mix. The pre-stirring paddle 44 is connected to the co-rotating belt 43 through the co-rotating teeth 441, and is driven to rotate by the co-rotating motor 42. The spiral turning blades 442 and the oblique stirring blades 443 on the pre-stirring paddle 44 can fully stir the mortar to ensure its uniformity and fluidity. The user can quickly disassemble and assemble the partition leaf 412 as needed to meet different work requirements.

[0095] 2. Transportation stage

[0096] A one-way valve 413 is provided at the bottom of the material preparation box 41 to control the delivery of mortar through the pressure in the pipeline. The mortar enters the transferor 54 of the printing mechanism 5 through the "L"-shaped delivery pipe. The three-way shaft 542 in the transferor 54 controls the opening and closing of the "T"-shaped three-way cavity 5421 through the three-way cylinder 55 to ensure that the mortar can flow to the printing component as needed. The packing plunger 53 of the packing cylinder 51 moves up and down in the packing tube 52, quantitatively absorbs the mortar and delivers it to the printing nozzle to ensure the accuracy and stability of the feeding.

[0097] 3. Printing stage

[0098] The printing mechanism 5 realizes precise movement in three-dimensional space through the translation and lifting mechanism 3. The translation and lifting mechanism 3 is driven by the lifting motor 31 to drive the lifting screw 32, which drives the "L"-shaped lifting frame 33 to reciprocate in the vertical direction. At the same time, the translation motor 34 drives the translation plate through the translation wheel 36 and the translation belt 37, so that the printing mechanism 5 can move in the horizontal direction to complete the printing of complex paths. The injection paddle 57 is installed at the end of the injection cylinder 56, and the injection blade 571 with its spiral opening design creates a pressure difference to ensure that the mortar is discharged evenly and stably. The mixing arm 572 of the injection paddle 57 further optimizes the fluidity of the mortar, improves the printing accuracy and the interlayer bonding quality.

[0099] 4. Finished product delivery stage

[0100] The printed components are transported to the rear bend by the conveyor belt 24. A horizontally laid square top plate 241 is installed inside the conveyor belt 24. The top plate 241 is supported by the inverted umbrella-shaped adjustment disks 23 at the four corners. The user can rotate the adjustment disks 23 to adjust the balance and height of the top plate 241 to ensure the stability of the printed components during the transportation process. The non-disassembly slideway 7 at the rear end of the conveyor belt 24 is in clearance with the conveyor belt 24, which can smoothly receive the printed products and realize automatic demoulding, avoiding damage to the components that may be caused by manual demoulding.

[0101] 5. Maintenance and Control

[0102] The main frame 1 is designed as a slidable gantry 11 structure, which is convenient for users to maintain and service the printing mechanism 5. A control switch 6 is set on the side of the main frame 1, and the user can control the opening and closing state of the printing mechanism 5 in real time through the switch to ensure the convenience and safety of operation.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A synchronously printed cement mortar 3D printing nozzle and its auxiliary device, comprising a main frame (1) carrying a covering belt mechanism (2) and a translation and lifting mechanism (3), wherein the covering belt mechanism (2) comprises a covering conveying roller (22) driven by a covering conveying motor (21), on which a covering conveying belt (23) is wrapped, characterized in that: The translation lifting mechanism (3) comprises a lifting screw (32) connected to a vertical lifting motor (31), on which an "L"-shaped lifting frame (33) is inserted, which can perform vertical reciprocating motion with the rotation of the screw, and a translation motor (34) is inserted into the side wall of the lifting frame (33), and a translation wheel (36) is sleeved at the end thereof. The translation wheels (36) are symmetrically arranged along the main frame (1), and a translation beam (35) is sandwiched therebetween. A translation belt (37) is wrapped around the outer periphery of the translation wheel (36), and a translation plate is coupled to the translation wheel. A material preparation mechanism (4) and a printing mechanism (5) are arranged at the end of the translation plate, and the translation plate can perform horizontal movement with the rotation of the translation belt (37); The material preparation mechanism (4) comprises a material preparation box (41) which is larger at the top and smaller at the bottom. A plurality of partition leaves (412) are intermittently inserted in the material preparation box (41). A material preparation bin (411) for storing cement mortar is formed between the plurality of partition leaves (412) and the inner wall of the box. A plurality of rotatable pre-mixing paddles (44) are inserted through the partition leaves (412) for instant mixing of cement mortar. The ends of the pre-mixing paddles (44) extending out of the side wall of the box are respectively sleeved with co-rotating belts (43) in sequence, and a co-rotating motor (42) embedded in the side wall of the box is sleeved for transmission. The pre-mixing paddles (44) can be rotated with the co-rotating belt (43) to pull the plurality of pre-mixing paddles (44) to mix and stir synchronously. A one-way valve (413) is independently buried at the bottom of the material preparation bin (411), and an "L"-shaped conveying pipe is extended forward from the bottom thereof, which can be opened instantly to convey the material as the pressure in the pipe changes. The printing mechanism (5) comprises a transfer device (54) connected to the conveying pipe, a "C"-shaped feeding pipe (59) being connected to the bottom of the transfer device (54), a three-way shaft (542) being transversely embedded in the transfer device (54), a "T"-shaped three-way cavity (5421) being provided on the three-way shaft (542) being adapted to the pipe opening, a three-way pin (541) being clamped on the end extending out of the transfer device (54), and a three-way air hole fixedly provided on the bottom wall of the material preparation box (41). The pushing part of the cylinder (55) is connected to the three-way pin (541), and can open and close the pipeline of the three-way cavity (5421) as the three-way cylinder (55) is extended and rotated. The end of the feeding pipe (59) is connected to an injection gun (58), and a downward independently controllable injection cylinder (56) is suspended on the top. A rotatable injection paddle (57) is provided at the end of the injection cylinder (56), which can rotate and move downward with the injection paddle (57) to create a pressure difference for injection printing.

2. According to claim 1, a synchronously printed cement mortar 3D printing nozzle and its auxiliary device are characterized in that: The printing mechanism (5) comprises a filling cylinder (51) suspended at the front of the material preparation box (41), with a plurality of filling plungers (53) arranged at the end thereof, each of which is inserted with a filling tube (52), and the bottom of each filling plunger (53) is connected to a transfer device (54), and can be reciprocated and lifted with the filling plunger (53) to suck in a certain amount of prepared material for filling and printing.

3. According to claim 2, a synchronously printed cement mortar 3D printing nozzle and its auxiliary device are characterized in that: The pre-mixing paddle (44) is distributed in an inverted triangle shape, and is radially provided with a plurality of evenly distributed spirally undulating turning blades (442). Three obliquely inserted stirring blades (443) are arranged behind the turning blades (442), which can rotate with the pre-mixing paddle (44) to promote the mixing of cement mortar, and at the end thereof, an annular rectangular co-rotating tooth (441) adapted to the co-rotating belt (43) is arranged, which can accurately transmit along with the co-rotating belt (43).

4. The cement mortar 3D printing nozzle and its accessory device for synchronous printing according to claim 3, characterized in that: The injection paddle (57) is radially provided with spirally opening injection blades (571), the center of which is provided with a square mixing arm (572) which can discharge cement mortar while the injection paddle (57) rotates and falls.

5. The synchronously printed cement mortar 3D printing nozzle and its accessory device according to claim 4, characterized in that: The translation lifting mechanism (3) comprises a plurality of sets of triangularly clamped elastic cooperative wheels (38), which clamp the main frame (1) and move smoothly by being fixed by opposite extrusion.

6. The synchronously printed cement mortar 3D printing nozzle and its accessory device according to claim 5, characterized in that: The top wall of the material preparation box (41) is provided with a quick-release groove (414) adapted to the partition leaf, and an oblique chamfer is provided along the upper section, so that the partition leaf (412) can be quickly disassembled and assembled according to different situations.

7. The synchronously printed cement mortar 3D printing nozzle and its accessory device according to claim 6, characterized in that: A disassembly-free slideway (7) is arranged at the rear end bend of the conveying belt (24), which is clearance-matched with the loosening belt and is used to receive the printed product conveyed to the bend, thereby avoiding manual demoulding.

8. The cement mortar 3D printing nozzle and its accessory device for synchronous printing according to claim 7, characterized in that: A horizontally laid square top plate (241) is arranged inside the conveying belt (24) and is gap-matched with the top wall of the conveying belt (24). A plurality of inverted umbrella-shaped adjustment disks (23) are arranged at the four corners of the bottom surface of the top plate (241). The raised portions (231) are respectively embedded at the four corners of the top plate (241). The raised portions (231) are sleeved with springs (25), and the top plate (241) can be raised and lowered in a balanced manner by rotating the adjustment disk (23).

9. The synchronously printed cement mortar 3D printing nozzle and its accessory device according to claim 8, characterized in that: The main frame (1) comprises a gantry frame (11) which can slide longitudinally with respect to the main frame (1) and is used for maintenance of the printing mechanism (5).

10. A synchronously printed cement mortar 3D printing nozzle and its accessory device according to any one of claims 1 to 9, characterized in that: A control switch (6) is provided on the side of the main frame (1) and can instantly control the opening and closing of the printing mechanism (5).

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