3D printing injector head for spraying concrete
By setting multiple sub-ejection heads and switch controls on the injection head, the problems of low efficiency and poor quality in existing injection concrete construction are solved, and efficient and uniform concrete injection is achieved, and construction quality and efficiency are improved.
Patent Information
- Application Number
- CN202422164161.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-04
AI Technical Summary
In the construction of existing jet concrete, the injection area of a single nozzle is small, the construction efficiency is low, the injection thickness is uneven, and the rebound rate is high, resulting in increased construction costs and poor quality.
Using 3D printed jet heads, multiple sub-ejection heads are set up, and connected through the header box and concrete conveying pipe, the simultaneous ejection of multiple sub-ejection heads is realized, combined with switch control, to ensure uniformity and flexibility of ejection.
It improves construction efficiency, increases the density and flatness of concrete, reduces construction costs, and ensures construction quality.
Smart Images
Figure CN223088928U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of concrete spraying equipment, and particularly relates to a 3D printing spray head for spraying concrete. Background Art
[0002] The construction of shotcrete is a construction method of spraying or pouring concrete by using a pressure spray gun. This method is fast and simple in construction and is widely used in municipal, tunnel, mine and other engineering projects. Its working principle is that the premixed concrete is pumped to the nozzle and mixed with the high-pressure air carrying the accelerator. The concrete is sprayed out at high speed under the action of the high-pressure air. However, the current shotcrete nozzles have the following problems: (1) The spraying area of a single nozzle is small, the construction efficiency is low, and the rebound rate of the shotcrete increases; (2) The cyclic spraying of concrete by a single nozzle is likely to cause uneven spraying thickness and unevenness of the concrete layer on the wall surface; (3) A single nozzle needs to spray the distribution bars and steel arch frames multiple times, with poor compactness and a high rebound rate of the shotcrete; (4) It causes uneven thickness of the secondary lining, and even overconsumption, increasing the construction cost. Content of the Utility Model
[0003] The purpose of the utility model is to provide a 3D printing spray head for spraying concrete according to the deficiencies of the above-mentioned prior art. By arranging a plurality of sub-spray heads on the 3D printing spray head, the printing speed can be increased, the construction efficiency can be improved, and the spraying is more uniform. The flatness of the shotcrete for the initial support can be increased, and the construction quality can be guaranteed.
[0004] The purpose of the utility model is achieved by the following technical solutions:
[0005] A 3D printing spray head for spraying concrete, the 3D printing spray head includes a header tank and a plurality of sub-spray heads. A plurality of through holes are formed on one side surface of the header tank. The sub-spray head includes a spray nozzle and a spray pipe communicating with the spray nozzle. The spray pipe is fixedly arranged in the header tank, and each spray nozzle extends out of the surface of the header tank through one of the through holes.
[0006] The plurality of sub-spray heads are arranged in an array.
[0007] The 3D printing spray head further includes a plurality of concrete conveying pipes having the same number as the spray pipes, and the concrete conveying pipes are connected to the spray pipes in a one-to-one correspondence.
[0008] The concrete conveying pipe is fixedly connected to the spray pipe through a flange joint.
[0009] The flange joint includes a first flange joint and a second flange joint. The first flange joint is disposed on another side surface opposite to the side surface of the header box where the through hole is provided, and the first flange joint is fixedly connected to one end of the injection pipe away from the injection head. The second flange joint is fixedly connected to the concrete delivery pipe, and the first flange joint and the second flange joint are bolted together.
[0010] A switch is disposed in each of the sub-injection heads, and the switch is used to control the on-off of the internal passage of the sub-injection head.
[0011] The injection nozzle is in the shape of a hollow frustum.
[0012] The advantages of the present utility model are as follows: (1) Multiple sub-injection heads can accelerate the printing speed, improve the construction efficiency, and save the construction period; (2) Using the 3D printing injection head to inject the distribution bars can increase the compactness of the concrete between the side of the steel arch and between the steel arch and the surrounding rock, and ensure the construction quality of the primary support; (3) The number of sub-injection heads for injecting the sprayed concrete can be arbitrarily controlled, so as to realize spraying the distribution bars first and then spraying as a whole, and the spraying is more uniform, which can increase the flatness of the sprayed concrete for the primary support. Description of the Drawings
[0013] Figure 1 is a schematic structural diagram of the 3D printing injection head in the present utility model;
[0014] Figure 2 is a schematic structural diagram of the interior of the header box in the present utility model;
[0015] Figure 3 is a schematic diagram of spraying concrete using the 3D printing injection head in the present utility model;
[0016] Figure 4 is a schematic process diagram of spraying construction using the 3D printing injection head in the present utility model. Detailed Embodiments
[0017] The features of the present utility model and other related features are further described in detail below with reference to the accompanying drawings through embodiments for the understanding of those skilled in the same industry:
[0018] As Figures 1-4 shown, the marks in the figure are respectively represented as: 3D printing injection head 1, steel arch 2, distribution bar 3, concrete 4, header box 11, through hole 12, sub-injection head 13, injection nozzle 14, injection pipe 15, flange joint 16, concrete delivery pipe 17.
[0019] Embodiment: As Figures 1-4As shown in the figure, this embodiment relates to a 3D printing spray head for shotcrete. The 3D printing spray head 1 includes a header box 11 and a plurality of sub-spray heads 13. Among them, a plurality of through holes 12 are formed on one side surface of the header box 11. The number of the through holes 12 is the same as that of the sub-spray heads 13. The sub-spray head 13 includes a spray nozzle 14 and a spray pipe 15 communicating with the spray nozzle 14. The spray pipe 15 is fixedly arranged in the header box 11, and each spray nozzle 14 extends out of the surface of the header box 11 through a through hole 12. Thus, by fixing a plurality of sub-spray heads 13 through the header box 11, the concrete slurry is input through the spray pipe 15 and is ejected under high pressure by the spray nozzle 14, realizing the simultaneous spraying of concrete by a plurality of sub-spray heads 13, which can speed up the printing speed, improve the construction efficiency, and save the construction period; and it can be used for spraying distribution bars 3, thereby increasing the compactness of the concrete between the side of the steel arch 2 and between the steel arch 2 and the cofferdam, ensuring the construction quality of the initial support.
[0020] In this embodiment, optionally, the plurality of sub-spray heads 13 are arranged in an array. That is to say, the through holes 12 formed on the side surface of the header box 11 are arranged in an array, and the spray nozzles 14 extending out of the surface of the header box 11 through the through holes 12 are also arranged in an array. The sub-spray heads 13 arranged in an array can make the spraying more uniform and can increase the flatness of the shotcrete for the initial support.
[0021] In this embodiment, the 3D printing spray head 1 further includes a plurality of concrete delivery pipes 17 having the same number as the spray pipes 15. The concrete delivery pipes 17 are connected to the spray pipes 15 in a one-to-one correspondence. That is to say, each concrete delivery pipe 17 communicates with a spray pipe 15, realizing the independent delivery of the concrete slurry of each sub-spray head 13, which is convenient for adjusting the delivery speed, pressure, etc. in any one of the delivery channels.
[0022] In this embodiment, optionally, the concrete delivery pipe 17 is fixedly connected to the spray pipe 15 through a flange joint 16. Adopting flange connection can achieve an efficient and reliable sealed connection between the concrete delivery pipe 17 and the spray pipe 15, and the connection method is simple, easy to install and disassemble.
[0023] In this embodiment, by way of example, the flange joint 16 includes a first flange joint and a second flange joint. Among them, the first flange joint is disposed on the other side surface opposite to the side surface of the header tank 11 where the through hole 12 is provided. And the first flange joint is fixedly connected to the end of the injection pipe 15 far from the injection head, while the second flange joint is fixedly connected to the end of the concrete delivery pipe 17. The first flange joint and the second flange joint can be fixedly connected by bolts. By fixedly arranging the first flange joint on the header tank 11, it is possible to avoid the situation that the concrete delivery pipe 17 drives the injection pipe 15 to shake, which in turn causes the injection nozzle 14 to be unstable. And since the injection pipe 15 is arranged in the header tank 11, by fixing the injection pipe 15 with the first flange joint, only the second flange joint and the concrete delivery pipe 17 part need to be disassembled subsequently, and the first flange joint, the injection pipe 15 and the header tank 11 can remain stationary.
[0024] In this embodiment, optionally, a switch is provided in each sub-injection head 13, and the switch is used to control the on and off of the internal channel of the sub-injection head 13. Thus, during the concrete spraying construction process, it is possible to control any number of sub-injection heads 13 at any position to spray concrete slurry, thereby improving the spraying accuracy, flexibility and adaptability. By way of example, when spraying the middle area, all the sub-injection heads 13 can be turned on for spraying, so as to ensure the spraying construction at the maximum printing speed. When spraying the edge area or the gap area, it is possible to control some of the sub-injection heads 13 to be turned on so that they are adapted to the size of the area to be sprayed, and to avoid spraying to other positions, resulting in waste.
[0025] In this embodiment, by way of example, the injection nozzle 14 is in the shape of a hollow frustum. This can make the pressure of the concrete slurry when it is ejected from the injection nozzle 14 become larger and the accuracy become higher.
[0026] Please refer to Figures 3-4 , and the following is an exemplary introduction to the steps when constructing using the 3D printing injection head 1 in this embodiment.
[0027] Taking the shotcrete for primary support as an example, first, position the 3D printing injection head 1. Align the two side injection nozzles 14 with the distribution bars 3 on both sides of the steel arch 2, and align the middle injection nozzle 14 with the steel arch 2. Control the middle injection nozzle 14 in the 3D printing injection head 1 to be closed and the two side injection nozzles 14 to be opened. Then start spraying concrete onto the distribution bars 3 of the steel arch 2 until the sprayed concrete 4 is flush with the steel arch 2. After that, open the middle injection nozzle 14 to make the concrete sprayed onto the steel arch 2 and the distribution bars 3 reach the designed thickness. At this time, the shotcrete for primary support is completed.
[0028] In summary, the beneficial effects of the present utility model are as follows: (1) Multiple sub-spray heads can accelerate the printing speed, improve the construction efficiency, and save the construction period; (2) Using this 3D printing spray head to spray the distribution bars can increase the compactness of the concrete between the side of the steel arch and between the steel arch and the surrounding rock, ensuring the construction quality of the primary support; (3) The number of sub-spray heads for spraying the shotcrete can be arbitrarily controlled, so as to achieve spraying the distribution bars first and then spraying integrally, with more uniform spraying, and the flatness of the shotcrete for the primary support can be increased.
[0029] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the field to which the present utility model belongs. The "first", "second" and similar terms used in the description and claims of the patent application of the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to indicate the relative position relationship, and when the absolute position of the object being described changes, the relative position relationship also changes accordingly.
[0030] The above are the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle described in the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.
Claims
1. A 3D printing spray head for shotcrete, characterized in that, The 3D printing jet head includes a manifold box and a plurality of sub-jet heads. A plurality of through holes are formed in one side surface of the manifold box. The sub-jet head includes a jet nozzle and a jet pipe communicating with the jet nozzle. The jet pipe is fixedly arranged in the manifold box, and each jet nozzle extends out of the surface of the manifold box through one of the through holes.
2. The 3D printing ejection head according to claim 1, characterized in that The plurality of sub-jet heads are arranged in an array.
3. The 3D printing ejection head according to claim 1, characterized in that, The 3D printing jet head further includes a plurality of concrete delivery pipes having the same number as the jet pipes, and the concrete delivery pipes are connected to the jet pipes in a one-to-one correspondence.
4. The 3D printing ejection head according to claim 3, characterized in that, The concrete delivery pipe is fixedly connected to the jet pipe through a flange joint.
5. The 3D printing ejection head according to claim 4, wherein, The flange joint includes a first flange joint and a second flange joint. The first flange joint is arranged on the other side surface opposite to the side surface of the manifold box where the through holes are formed, and the first flange joint is fixedly connected to the end of the jet pipe away from the jet head. The second flange joint is fixedly connected to the concrete delivery pipe, and the first flange joint and the second flange joint are bolted together.
6. The 3D printing ejection head according to claim 1, wherein A switch is arranged in each sub-jet head, and the switch is used to control the on-off of the internal channel of the sub-jet head.
7. The 3D printing ejection head according to claim 1, wherein, The jet nozzle is in the shape of a hollow frustum of a cone.