CN107685379B - Array type spray head suitable for cement-based material 3D printing system - Google Patents

Abstract

The application relates to an array type spray head suitable for a cement-based material 3D printing system, which is characterized by comprising a spray head shell and an array nozzle mechanism; the spray head shell comprises a bottom plate, side walls, a partition plate, a cover plate, a V-shaped supporting plate and a turbine speed reducer shell, wherein the cross section of the bottom plate is of a W shape, two lowest points of the W-shaped bottom plate are provided with spray nozzles, a plurality of spray nozzles are arranged at equal intervals along the length direction of the bottom plate, two side surfaces of the upper part of the W-shaped bottom plate are fixedly connected with the side walls, and the bottom plate and the side walls are integrally of an inverted cone shape; the middle end surface of the upper part of the W-shaped bottom plate supports the lower part of a V-shaped supporting plate, the V-shaped supporting plate is arranged in parallel with the bottom plate up and down, and holes are formed in the V-shaped supporting plate corresponding to the positions of the nozzles; two partition boards are symmetrically arranged in a space surrounded by the bottom board and the side wall in the V-shaped supporting board, cover boards are fixed on the upper parts of the two partition boards, a sealing bin is formed among the partition boards, the V-shaped supporting board and the adjacent side wall, and the upper part of the sealing bin is connected with an external feeding mechanism.

Description

An array nozzle suitable for 3D printing system of cement-based materials

technical field

The invention relates to the technical field of 3D printing machinery and equipment, in particular to an array nozzle suitable for a cement-based material 3D printing system.

Background technique

In recent years, with the rapid development of my country's major infrastructure and energy engineering construction, high hydropower slopes, road and railway tunnels, underground caverns, nuclear power plant foundations, nuclear waste storage, underground oil and gas storage, mineral development, shale oil and gas and Major projects such as geothermal development involve complex geological structures with faults and three-dimensional fracture network rock masses. Physical model test is one of the main research methods in the field of geotechnical engineering, and its basis is to prepare a physical model that can accurately characterize complex geological structures. Due to the existence of these discontinuous surfaces and bodies in the rock mass, there is currently no mature method in the world to make a three-dimensional model of complex geological structure physical tests.

3D printing technology is a kind of manufacturing technology that has emerged in recent years, including cutting-edge technical knowledge in many aspects, and has high-tech content. It has been widely used in biomedical, aerospace, mold manufacturing, electronic information manufacturing, automobile manufacturing and other fields. The use of 3D printing technology to produce large-scale complex geological structure models is the basis for exploring the mechanism of engineering geological hazards. The biggest advantage of 3D printing technology is that it can realize the controllability and reproducibility of the model, which is suitable for repeated experimental research.

Applying 3D printing technology to the production of physical models of complex geological structures is a science and technology with broad application prospects. As the core component of 3D printing technology, the print nozzle is of great significance for solving engineering problems in related fields. In the production of engineering geological models, it is necessary to convert the printing width in real time according to the dimensional accuracy of the printing model and the complexity of the internal structure of the model. However, the printing nozzles in the prior art are all fixed in size and cannot be adjusted during the printing process.

The Chinese patent with the notification number CN104191494B discloses a new type of hot-melt cement 3D printing head, whose main function is to realize 3D printing of materials with high temperature and poor fluidity. The print head is composed of two parts, the hot material conveying device and the cold material conveying device. It is mainly designed for the specific material of new hot melt cement, which only has cement, and the designed 3D printing head is only suitable for printing ordinary buildings. . However, in the production of engineering geological models, if only cement is used as raw material, and the raw material does not contain fine sand, aggregate, etc., the strength of the material cannot be guaranteed. At the same time, the production of engineering geological models pays more attention to the complexity of the internal structure of the model, and requires a larger volume of printing nozzles. However, in the prior art, there is no general-purpose large-volume cement-based material 3D printing nozzle for making complex geological structure models, and the new hot-melt cement 3D printing heads shown in Figures 1 and 2 cannot make complex geological structure models.

Contents of the invention

In view of the above technical problems, the present invention provides an array nozzle suitable for a cement-based material 3D printing system. The nozzle is specially designed for the 3D printing system of cement-based materials. It is an array type, which can control the switch of each nozzle in real time during the printing process, thereby adjusting the overall printing width.

The technical solution adopted by the present invention to solve the technical problem is to provide an array nozzle suitable for cement-based material 3D printing system, which is characterized in that the array nozzle includes a nozzle housing and an array nozzle mechanism; the nozzle housing includes a bottom plate , side wall, partition plate, cover plate, V-shaped support plate and turbine reducer casing, the cross-section of the bottom plate is W-shaped, and there are spouts at the two lowest points of the W-shaped bottom plate, equidistant along the length direction of the bottom plate A plurality of nozzles are arranged, and the upper two sides of the W-shaped bottom plate are fixedly connected with the side walls, and the bottom plate and the side walls are in an inverted cone shape as a whole; the upper middle end surface of the W-shaped bottom plate supports the lower part of the V-shaped support plate, and the V-shaped support plate Arranged in parallel with the base plate up and down, holes are opened on the V-shaped support plate corresponding to the position of the nozzle; two partitions are arranged symmetrically in the space enclosed by the bottom plate and the side wall on the V-shaped support plate, and the upper parts of the two partitions are fixed. A sealed silo is formed between the cover plate, the partition plate, the V-shaped support plate and the adjacent side walls, and the upper part of the sealed silo is connected to the external feeding mechanism; the turbine reducer casing is fixed above the cover plate; the sealed silo is long Strip shape, and the length direction of the feeding mechanism is parallel to the sealed silo;

The array nozzle mechanism includes a worm gear reducer, a sun gear and a number of nozzle units, the sun gear is arranged in the center of the V-shaped support plate, the worm gear reducer is contained in the worm gear reducer housing, and the output of the worm gear reducer The end passes through the cover plate and is vertically connected with the central gear, and the central gear can be driven to rotate through the worm gear reducer; a number of nozzle units are distributed on both sides with the central gear as the center; each nozzle unit includes a power component, a booster valve, and a nozzle twist Dragon, outer gear, inner gear, upper end gear and lower end gear, one end of the power part is connected to the external power source, the lower part of the power part passes through the cover plate and connects with the booster valve, and the power part is realized through the booster valve. Supercharging; the lower part of the booster valve is fixedly connected to the upper end gear; the upper part of the nozzle auger is fixedly connected to the lower surface of the upper end gear, and the lower part of the nozzle auger passes through the lower end gear, the outer gear, and the V-shaped support plate in sequence corresponding openings on the upper surface, and go deep into the corresponding nozzles on the bottom plate; the lower end gear can slide up and down on the nozzle auger, so that the face teeth of the lower end gear and the upper end gear can mesh with each other; the inner side of the outer gear The inner gear meshed with it is installed; the inner gear and outer gear of two adjacent nozzle units also mesh with each other, one end of the central gear meshes with the inner gear of one or several nozzle units in a row, and the other end meshes with the inner gear of some nozzle units in a row. The inner gears of one or several nozzle units in another row are meshed.

Compared with prior art, the beneficial effect of the present invention is:

The array nozzle of the present invention is specially designed for 3D printing of cement-based materials. The array nozzle is composed of multiple rows of independently controllable nozzle units. During the printing process, each nozzle can be flexibly and independently controlled according to the geometric structure of the model to be printed. The switch of the nozzle unit, so taking into account the large size and high precision at the same time, multiple nozzle units work at the same time also improves the printing efficiency when making models (especially complex model structures), filling the blank of cement-based material array 3D printing nozzles .

Description of drawings

Fig. 1 is the structural schematic diagram of the thermal material conveying device of existing cement material 3D printing nozzle;

Fig. 2 is a structural schematic diagram of the cold material conveying device of the existing cement material 3D printing nozzle;

Fig. 3 is a structural schematic diagram of an array nozzle suitable for a cement-based material 3D printing system according to the present invention;

Fig. 4 is a schematic diagram of the installation structure of two nozzle units and a turbine reducer of the present invention;

Fig. 5 is a front view partial cross-sectional structural schematic diagram of the array nozzle mechanism 2 of an embodiment of the array nozzle mechanism 2 applicable to the cement-based material 3D printing system of the present invention;

Fig. 6 is a schematic diagram of the installation arrangement of the central gear, the inner gear and the outer gear on the V-shaped support plate of the present invention;

In the figure, 1. Nozzle shell, 2. Array nozzle mechanism, 3. Feeding mechanism, 11. Bottom plate, 12. Side wall, 13. Partition plate, 14. V-shaped support plate, 15. Sealed silo, 16. Turbine Reducer shell, 17. Cover plate, 21. Nozzle auger, 22. Outer gear, 29. Inner gear, 23. Central gear, 24. Upper end gear, 25. Lower end gear, 26. Booster valve, 27. Cylinder, 28. turbine reducer, 111. spout, 112. side wall mounting hole.

Detailed ways

The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but this should not be used as a limitation to the protection scope of the claims of the present application.

The present invention is applicable to the array type nozzle of cement-based material 3D printing system (array type nozzle for short, refer to Fig. 3 ) comprising a nozzle housing 1 and an array nozzle mechanism 2; , cover plate 17, V-shaped support plate 14 and turbine reducer housing 16, the cross section of described base plate 11 is W-shaped, has spout 111 at the two lowest points of W-shaped base plate, is arranged at equal intervals along the length direction of the base plate A plurality of nozzles, the upper two sides of the W-shaped bottom plate are provided with side wall mounting holes 112, and the bottom plate 11 is fixedly connected with the side wall 12 through the side wall mounting holes through the bolts, and the bottom plate and the side wall 12 are in an inverted tapered shape as a whole; W The upper middle end surface of the type bottom plate supports the bottom of the V-shaped support plate 14, and the V-shaped support plate 14 is arranged parallel to the bottom plate up and down, and has holes on the V-shaped support plate corresponding to the position of the spout; the base plate on the V-shaped support plate and the Two partitions 13 are symmetrically arranged in the space surrounded by the side walls, the upper part of the two partitions is fixed with a cover plate 17, and a sealed silo 15 is formed between the partitions 13, the V-shaped support plate and the adjacent side walls 12, The upper part of the sealed silo 15 is connected to the external feeding mechanism 3; the worm gear reducer casing 16 is fixed above the cover plate 17, and the two ends of the worm gear reducer casing 16 are fixed to the lower end of the external feeding mechanism; the sealed hopper 15 is a strip shape, and the length direction of the feeding mechanism is parallel to the sealed silo, and has an angle of 45°, so that the concrete material can flow under its own weight, which is conducive to the transportation of materials;

Described array nozzle mechanism 2 (referring to Fig. 4 and Fig. 5) comprises worm gear reducer 28, sun gear 23 and several nozzle units, and described sun gear is arranged on the center of V-shaped support plate 14, and described worm gear reducer 28 Included in the casing of the worm reducer, the output end of the worm reducer 28 is vertically connected to the central gear through the cover plate 17, and the worm reducer can drive the central gear to rotate; a number of nozzle units are distributed on both sides with the central gear as the center; Each nozzle unit all comprises cylinder 27 (power part), booster valve 26, nozzle auger 21, outer gear 22, inner gear 29, upper face gear 24 and lower face gear 25, and one end of said cylinder 27 is connected to an external air pressure source connection, the lower part of the cylinder 27 passes through the cover plate 17 and connects with the booster valve 26, and realizes the pressurization of the cylinder through the booster valve; the lower part of the booster valve 26 is fixedly connected to the upper face gear 24; the upper part of the nozzle auger 21 Fixedly connected with the lower surface of the upper face gear 24, the lower part of the nozzle auger 21 passes through the corresponding openings on the lower face gear 25, the outer gear 22, and the V-shaped support plate 14 in turn, and penetrates into the corresponding nozzle 111 on the bottom plate 11. The lower face gear 25 can slide up and down on the nozzle auger 21, so that the face teeth of the lower face gear 25 and the upper face gear 24 can mesh with each other; the inner side of the outer gear 22 is equipped with an inner gear 29 meshed with it ; The inner gear and the outer gear of two adjacent nozzle units are also meshed with each other, and one end of the central gear 23 is meshed with the inner gear of one or several nozzle units in one row, and the other end is meshed with one or more inner gears of another row. The inner gears of some nozzle units are meshed.

A further feature of the present invention is that a number of nozzle augers are divided into two rows and arranged in parallel arrays, and the number of nozzle openings on the bottom plate is the same as that of the nozzle augers, and the positions correspond to each other. In the present invention, one end of the central gear can be connected to one inner gear, or two inner gears (see Figure 6). As long as the central gear is rotated, the inner gear can be driven to rotate, and the inner gear can be connected to each other through the outer gear and the inner gear. The meshing form drives all the outer gears to rotate, and then the entire row of outer gears can rotate, thereby controlling each nozzle auger 21 to perform corresponding actions.

A further feature of the present invention is that a nozzle auger is also installed on the inner gear, and a nozzle opening is correspondingly opened on the bottom plate directly below the inner gear. The same mechanism is installed on the inner gear and the outer gear, so that the nozzle auger on the inner gear can perform corresponding actions, that is, the upper part of the nozzle auger is also connected to an upper end gear, and the upper part of the upper end gear is connected through a booster valve. A power part, the bottom of the nozzle auger passes through the lower face gear 25, the inner gear, the V-shaped support plate successively, and goes deep into the corresponding nozzle in the bottom plate. Such an arrangement can help reduce the size of the entire array nozzle, making the layout more reasonable and beautiful.

A further feature of the present invention is that the size of each nozzle 111 is 12mm x 12mm. The size of each nozzle in the present invention can also be 15mm×15mm, 5mm×5mm. The size of the nozzle controls the printing accuracy. The larger the nozzle size, the worse the printing accuracy, and the smaller the nozzle, the longer the printing time. The preferred size is 12mm×12mm. The nozzle can independently control the printing switch, and the printing speed is controllable, which has strong practical value.

The working process of the array nozzle of the present invention is: the concrete material (cement-based material) enters the sealed silo 15 through the feeding mechanism 3, and the upper end face gear moves downward under the common power drive of the booster valve and the cylinder, and is connected with the lower The end gears are engaged and connected to drive the rotation of the nozzle auger; similarly, the upper end gear can be separated from the lower end gear when the cylinder stops working to stop the rotation of the nozzle auger. The rotation of the nozzle auger causes the concrete material to be squeezed out for printing.

In the present invention, the size of the nozzle is related to the cement-based material. If the size of the printing nozzle is set to be fixed, then the gradation of raw materials, water consumption, etc. need to be adjusted when preparing the cement-based material, so as to ensure that the concrete material can flow smoothly from each Squeeze out of the spout. The applicable materials of the array printing nozzle of the present invention are cement, lightweight aggregate concrete, etc., and can be applied to 3D printing of general large-volume cement-based materials for making complex geological structure models.

In the present invention, the cylinder is a power component, which can drive the nozzle auger to stir, and the cylinder can be replaced by a motor or a hydraulic power element.

Example 1

This embodiment is applicable to the array nozzle of the cement-based material 3D printing system, which includes a nozzle housing 1 and an array nozzle mechanism 2; the nozzle housing 1 includes a bottom plate 11, a side wall 12, a partition 13, a V-shaped support plate 14, and a turbine reducer housing 16 and the cover plate 17, the bottom plate, the side wall, the partition, the turbine reducer casing, and the feeding mechanism are fixedly connected to each other by welding, and the function of the nozzle casing is to support the array nozzle mechanism 2; the array nozzle mechanism 2 includes Nozzle auger 21, outer gear 22, central gear 23, upper gear 24, lower gear 25, booster valve 26, cylinder 27, worm gear reducer 28 and inner gear 29, array nozzle mechanism 2 is a 3D printing array nozzle main body structure;

The cross-section of the base plate 11 is W-shaped, and there are spouts 111 at the two lowest points of the W-shaped base plate. There are 50 spouts 111 on the base plate 11, which are arranged in two parallel rows to match the nozzle auger. 21 forms a nozzle array; the bottom plate 11 and the side wall 12 are fixedly connected through the side wall mounting holes 112 to form a space for printing material storage and nozzle unit movement; the upper part of the side wall 12 is a cover plate 17, and the side wall and the cover plate 17 The feeding mechanism 3 is installed symmetrically between them, and the feeding mechanism 3 is used to provide the cement-based material required for printing; the V-shaped support plate is fixedly connected to the bottom plate 11 through long bolts 18, and between the V-shaped support plate and the cover plate 17 The two partitions 13 are fixed symmetrically by welding to separate the nozzle auger 21 from other control components. A sealed silo 15 is formed between the partition 13, the V-shaped support plate and the adjacent side wall 12, and the sealed silo The upper part of 15 is connected to the external feeding mechanism 3; the worm gear reducer casing 16 is used to wrap the worm reducer 28, and the worm reducer casing 16 is connected with the partition plate 13 by welding;

The array nozzle mechanism 2 includes a worm gear reducer 28, a sun gear 23 and a number of nozzle units, the sun gear is arranged at the center of the V-shaped support plate 14, the worm gear reducer 28 is included in the worm gear reducer housing, The output end of the worm gear reducer 28 passes through the cover plate 17 and is vertically connected with the central gear, and the worm gear reducer can drive the central gear to rotate; a number of nozzle units are distributed in two rows with the central gear as the center; each nozzle unit includes a cylinder 27 , booster valve 26, nozzle auger 21, outer gear 22, inner gear 29, upper end gear 24 and lower end gear 25, one end of the cylinder 27 is connected with an external air pressure source, and the bottom of the cylinder 27 passes through the cover plate 17 and The booster valve 26 is connected by bolts, and the cylinder is boosted by the booster valve; the lower part of the booster valve 26 is fixedly connected to the upper face gear 24; the upper part of the nozzle auger 21 is fixedly connected to the lower surface of the upper face gear 24 , the bottom of the nozzle auger 21 passes through the corresponding openings on the lower face gear 25, the outer gear 22, and the V-shaped support plate 14 in turn, and penetrates into the corresponding nozzle 111 on the bottom plate 11; The auger 21 slides up and down, so that the face teeth of the lower end gear 25 and the upper end gear 24 can mesh with each other; the inner side of the outer gear 22 is equipped with an inner gear 29 meshing with it; the outer gear is welded with the nozzle auger It is vertically corresponding to the lower end gear, and is fixedly connected; the upper end gear is vertically corresponding to the booster valve and the cylinder, and is spirally connected; the outer gear, the inner gear, and the central gear are meshed and connected in the same horizontal plane. The central gear is vertically corresponding to the worm reducer and connected by welding.

In this embodiment, the size of the array nozzle is: a single nozzle size is 12mm×12mm, there are 50 individual nozzles in total, the maximum width that the array nozzle can print is 25×12=300mm, and the printing range is 12-300mm.

The nozzle augers 21 are two parallel rows arranged in an array, each row is equipped with 25 nozzle augers 21, and 50 nozzles of the same size are provided on the base plate 11. The cement-based material is extruded out of the array nozzle from the corresponding nozzle opening under the rotation extrusion of the nozzle auger 21 .

Example 2

The connection relationship of each part of the array nozzle in this embodiment is the same as in Embodiment 1, the difference is that in this embodiment, each inner gear is also equipped with a nozzle auger, and the bottom plate directly below the inner gear is also opened accordingly. There are spouts. Each inner gear is equipped with a cylinder, a booster valve, an upper face gear, and a lower end face gear through the nozzle auger, and the specific connection relationship is the same as that between each part on the outer gear.

In this embodiment, a total of 50 nozzles are arranged according to the method shown in Figure 6, that is, the center gear is divided into two sides, and the number of outer gears on each side is 13, and the number of inner gears is 12. One side of the central gear and two The two inner gears mesh at the same time, and the other side meshes with an inner gear. The maximum printable width of the array nozzle is 13×12=156mm. Each independent nozzle corresponds to a cylinder, and each nozzle can be controlled independently, so the printing range is 12-156mm, and the printing accuracy is 12mm. Thus, the adjustment of the print width of the print head is realized.

It should be noted that the nozzle unit and the sealed silo in this embodiment are controlled by corresponding electronic control systems. And the electronic control system adopts the electronic control system commonly used in the field, and will not be described in detail here.

After the structure and working principle of the cement-based material array 3D printing nozzle in this embodiment are described in detail, the working process is explained as follows:

(1) Feed: inject material from the outside to the feeding mechanism, and after stirring, the slurry is transported to the sealed silo.

(2) Printing: Control the movement of the cylinder at the position to be printed, drive the corresponding upper and lower end gears to mesh, and at the same time, the turbine reducer controls the rotation of the nozzle auger to squeeze out the slurry to achieve printing.

(3) Printing method control: By controlling the movement of cylinders at different positions, local printing of geological bodies of different shapes can be realized.

Tests have proved that the array type cement-based material 3D printing nozzles of this embodiment can successfully realize the 3D printing of cement-based materials, and have high precision and high speed, and have strong practicability.

So far, the present embodiment has been described in detail with reference to the drawings. Based on the above description, those skilled in the art should have a clear understanding of the cement-based material array 3D printing nozzle of the present invention.

It should be noted that, in the accompanying drawings or in the text of the specification, implementations that are not shown or described are forms known to those of ordinary skill in the art, and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and those of ordinary skill in the art can easily modify or replace them, for example:

(1) The control of the cylinder of the above-mentioned printing nozzle can also be controlled by a motor;

(2) The above-mentioned cement-based materials can also adopt other materials such as gypsum;

(3) This document may provide examples of parameters containing specific values, but these parameters need not be exactly equal to the corresponding values, but may approximate the corresponding values within acceptable error tolerances or design constraints;

(5) The directional terms mentioned in the embodiments, such as "up", "down", "front", "back", "left", "right", etc., are only referring to the directions of the drawings, and are not used to limit protection scope of the present invention.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

What is not mentioned in the present invention is applicable to the prior art.

Claims (6)

1. An array nozzle suitable for 3D printing systems of cement-based materials, characterized in that the array nozzle comprises a nozzle housing and an array nozzle mechanism; the nozzle housing comprises a bottom plate, a side wall, a partition, a cover plate, a V-shaped The supporting plate and the casing of the turbine reducer, the cross section of the bottom plate is W-shaped, there are nozzles at the two lowest points of the W-shaped bottom plate, and a plurality of nozzles are arranged at equal intervals along the length direction of the bottom plate, and the upper part of the W-shaped bottom plate has two The side is fixedly connected to the side wall, the bottom plate and the side wall are in an inverted cone shape as a whole; the upper middle end surface of the W-shaped bottom plate supports the lower part of the V-shaped support plate, and the V-shaped support plate is arranged parallel to the top and bottom of the bottom plate. Holes are opened on the V-shaped support plate; two partitions are symmetrically arranged in the space surrounded by the bottom plate and the side wall on the V-shaped support plate, and the upper part of the two partitions is fixed. A sealed silo is formed between the adjacent side walls, and the upper part of the sealed silo is connected to the external feeding mechanism; the casing of the turbine reducer is fixed above the cover plate; the sealed silo is long, and the length direction of the feeding mechanism is in line with the sealing Silo parallel; The array nozzle mechanism includes a worm gear reducer, a sun gear and a number of nozzle units, the sun gear is arranged in the center of the V-shaped support plate, the worm gear reducer is contained in the worm gear reducer housing, and the output of the worm gear reducer The end passes through the cover plate and is vertically connected with the central gear, and the central gear can be driven to rotate through the worm gear reducer; a number of nozzle units are distributed on both sides with the central gear as the center; each nozzle unit includes a power component, a booster valve, and a nozzle twist Dragon, outer gear, inner gear, upper end gear and lower end gear, one end of the power part is connected to the external power source, the lower part of the power part passes through the cover plate and connects with the booster valve, and the power part is realized through the booster valve. Supercharging; the lower part of the booster valve is fixedly connected to the upper end gear; the upper part of the nozzle auger is fixedly connected to the lower surface of the upper end gear, and the lower part of the nozzle auger passes through the lower end gear, the outer gear, and the V-shaped support plate in sequence corresponding openings on the upper surface, and go deep into the corresponding nozzles on the bottom plate; the lower end gear can slide up and down on the nozzle auger, so that the face teeth of the lower end gear and the upper end gear can mesh with each other; the inner side of the outer gear The inner gear meshed with it is installed; the inner gear and outer gear of two adjacent nozzle units also mesh with each other, one end of the central gear meshes with the inner gear of one or several nozzle units in a row, and the other end meshes with the inner gear of some nozzle units in a row. The inner gears of one or several nozzle units in another row are meshed. 2. The array nozzle suitable for 3D printing system of cement-based materials according to claim 1, characterized in that the angle between the sealed silo and the horizontal plane is 45°. 3. The array nozzle suitable for cement-based material 3D printing system according to claim 1, characterized in that a nozzle auger is also installed on the inner gear, and the bottom plate directly below the inner gear is also opened correspondingly. There are spouts. 4. The array nozzle suitable for cement-based material 3D printing system according to claim 1, characterized in that a number of nozzle augers are divided into two rows and arranged in parallel arrays, and the number of nozzle openings on the bottom plate is equal to the number of nozzle augers Same, location corresponds. 5. The array nozzle suitable for 3D printing system of cement-based materials according to claim 1, characterized in that the size of each nozzle is 12mm×12mm. 6. The array nozzle suitable for 3D printing system of cement-based materials according to claim 1, characterized in that the power component is a cylinder or a motor.