A high-efficiency mixing and anti-blocking nozzle for a quick-setting agent and shotcrete

Abstract

The application provides a high-efficiency mixing and anti-blocking spray head of a quick-setting agent and shotcrete, which comprises a concrete spraying pipeline, a high-wear-resistance spray head and a first compressed air pipeline, and further comprises: a quick-setting agent main pipeline connected with a four-way branch pipe, three other joints of the four-way branch pipe being connected with a first quick-setting agent branch pipeline and two second quick-setting agent branch pipelines respectively; three groups of quick-setting agent spraying pipelines being arranged and connected with the first quick-setting agent branch pipeline and the two second quick-setting agent branch pipelines respectively; a first inclined pipe, one end of which extends into the high-wear-resistance spray head and the other end of which is communicated with a quick-setting agent spraying pipeline output end corresponding to the first quick-setting agent branch pipeline; two second inclined pipes, one end of each of which extends into the concrete spraying pipeline and the other end of each of which is communicated with a quick-setting agent spraying pipeline output end corresponding to the second quick-setting agent branch pipeline. The concrete of the application is atomized and sprayed into the high-wear-resistance spray head and the concrete spraying pipeline through the first inclined pipe and the two second inclined pipes respectively, and the blockage can be effectively prevented.

Description

Technical Field

[0001] This application relates to the field of wet spraying concrete technology, and in particular to a nozzle for efficient mixing and anti-clogging of a quick-setting agent with sprayed concrete. Background Technology

[0002] Shotcrete is widely used in tunnel support, slope reinforcement, and mine roadway construction. Its construction efficiency and quality are highly dependent on the performance of the nozzle. During shotcrete construction, problems such as uneven mixing of the accelerator and concrete, and nozzle clogging are common. The main reasons for this include improper aggregate gradation design or coarse particles causing blockage, adhesion and hardening of the slurry leading to gradual narrowing and blockage of the pipes, and improper nozzle design, such as abrupt changes in the internal flow channel, dead zones, or rough surfaces, which prevent normal concrete flow and cause blockages. These issues severely affect construction efficiency and quality, leading to spraying interruptions, material waste, and structural defects.

[0003] While the above-mentioned reasons can be prevented by concrete mix design and material control, clogging caused by improper nozzle design must be solved by properly designing the nozzles to prevent clogging.

[0004] Therefore, the development of anti-clogging nozzles has become one of the key technological challenges in the industry. Utility Model Content

[0005] To address the problems of easy clogging and difficult cleaning of traditional nozzles, this application provides a nozzle that efficiently mixes quick-setting agents with shotcrete and prevents clogging.

[0006] The technical solution provided in this application for a spray nozzle that efficiently mixes quick-setting agents with shotcrete and prevents clogging is as follows:

[0007] A nozzle for efficient mixing and anti-clogging of a quick-setting agent with shotcrete, comprising a concrete spraying pipe and a high-wear-resistant nozzle connected together, wherein the end of the concrete spraying pipe away from the high-wear-resistant nozzle is connected to a first compressed air pipe, and further comprising:

[0008] The main pipeline for quick-setting agent is connected to a four-way branch pipe, and the other three joints of the four-way branch pipe are respectively connected to the first quick-setting agent branch pipe and two second quick-setting agent branch pipes.

[0009] The accelerator injection pipeline is provided with three sets, which are respectively connected to the ends of the first accelerator distribution pipe and the two second accelerator distribution pipes;

[0010] The first oblique tube extends one end into the high wear-resistant nozzle and the other end is connected to the output end of the quick-setting agent injection pipeline corresponding to the first quick-setting agent diversion tube.

[0011] The second inclined pipe has two ends, one of which extends into the concrete spraying pipe and the other end is connected to the output end of the quick-setting agent spraying pipe corresponding to the second quick-setting agent diversion pipe.

[0012] Furthermore, two second oblique nozzles are symmetrically distributed on both sides of the concrete spraying pipe.

[0013] Furthermore, the accelerator injection pipeline includes the following components connected in sequence:

[0014] A first check valve is used to connect to either the first quick-setting agent distribution pipe or the second quick-setting agent distribution pipe.

[0015] The quick-setting agent atomizing tube is connected at one end to the first one-way valve and at the other end to the first inclined tube or the second inclined tube;

[0016] The outer peripheral wall of the quick-setting agent atomizing tube is connected to a second compressed air pipe.

[0017] Furthermore, the second compressed air pipe is connected to the accelerator atomizing pipe at an angle.

[0018] Furthermore, the central axis of the bevel between the second compressed air pipe and the accelerator atomizing pipe coincides with the central axis of the first bevel pipe or the second bevel pipe.

[0019] Furthermore, the first beveled tube is threadedly connected to the high wear-resistant nozzle, and the insertion depth of the first beveled tube in the high wear-resistant nozzle is adjustable.

[0020] Furthermore, a spiral sleeve is coaxially arranged inside the concrete spraying pipe, and the connection between the first compressed air pipe and the concrete spraying pipe and the connection between the second oblique pipe and the concrete spraying pipe both correspond to the spiral seam of the spiral sleeve.

[0021] Furthermore, the spiral sleeve is provided with a positioning groove at its end, and the inner wall of the concrete spraying pipe is provided with a positioning block that is compatible with the positioning groove.

[0022] Furthermore, a second one-way valve is installed on the main pipeline of the accelerator, which only allows the accelerator to flow in the direction closer to the four-way diversion pipe.

[0023] Furthermore, an electromagnetic flow sensor is installed on the main pipeline of the quick-setting agent.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By optimizing the internal structure of the nozzle, using wear-resistant materials and an unobstructed channel design, combined with a compressed air-assisted flushing system, the risk of concrete and accelerator deposition is significantly reduced. The concrete spraying pipe is equipped with a detachable spiral sleeve, which can guide the concrete to form a vortex, reduce aggregate accumulation, and reduce the risk of pipe blockage. It also supports quick disassembly and maintenance, providing an efficient and reliable solution for tunnel support, mine roadways and other scenarios.

[0026] 2. High-pressure air atomization of the accelerator is used, and compressed air is blown into the concrete spraying pipe to fully contact the concrete, so that the accelerator and concrete are fully mixed and uniform, which greatly improves the effect of the accelerator and supports quick disassembly and maintenance; it can also accurately record the real-time dosage of the accelerator, and the high wear-resistant nozzle is equipped with an insertable first inclined tube at the rear end to further promote the uniform mixing of the accelerator and concrete.

[0027] 3. The first and second quick-setting agent diversion pipes are connected to the high wear-resistant nozzle and the concrete spraying pipe respectively through the first and second inclined pipes. This inclined connection method can effectively prevent concrete from flowing back into the quick-setting agent pipe and causing blockage. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the connection structure of the second accelerator diversion pipe, the accelerator injection pipe and the second oblique pipe in an embodiment of this application.

[0031] Figure label:

[0032] 1. Concrete spraying pipes;

[0033] 2. Highly wear-resistant nozzle;

[0034] 31. First compressed air pipe; 32. Second compressed air pipe;

[0035] 4. Accelerator main pipeline; 41. Four-way branch pipe; 42. First accelerator branch pipe; 43. Second accelerator branch pipe;

[0036] 51. First oblique-ended tube; 52. Second oblique-ended tube;

[0037] 61. First check valve; 62. Accelerator atomizing tube;

[0038] 7. Spiral sleeve;

[0039] 81. Second check valve; 82. Electromagnetic flow sensor. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] Reference Figure 1 and Figure 2 This application discloses a nozzle for efficient mixing and anti-clogging of a quick-setting agent and shotcrete, comprising a concrete spraying pipe 1 and a high-wear-resistant nozzle 2 connected together. A first compressed air pipe 31 is connected to the end of the concrete spraying pipe 1 furthest from the high-wear-resistant nozzle 2. The concrete spraying pipe 1 and the high-wear-resistant nozzle 2 are connected by a sealing flange.

[0042] Also includes:

[0043] The main pipe 4 for quick-setting agent is connected to a four-way branch pipe 41. The other three joints of the four-way branch pipe 41 are respectively connected to the first quick-setting agent branch pipe 42 and two second quick-setting agent branch pipes 43.

[0044] The accelerator injection pipeline is provided with three sets, which are respectively connected to the ends of the first accelerator diversion pipe 42 and the two second accelerator diversion pipes 43;

[0045] The first oblique tube 51 extends one end into the high wear-resistant nozzle 2 and the other end is connected to the output end of the quick-setting agent injection pipeline corresponding to the first quick-setting agent diversion tube 42.

[0046] There are two second inclined pipes 52. One end of the pipe extends into the concrete spraying pipe 1, and the other end is connected to the output end of the quick-setting agent spraying pipe corresponding to the second quick-setting agent diversion pipe 43. The two second inclined pipes 52 are symmetrically distributed on both sides of the concrete spraying pipe 1.

[0047] Among them, reference Figure 1 and Figure 2 The accelerator injection pipeline includes the following components connected in sequence:

[0048] The first one-way valve 61 is used to connect to the first quick-setting agent diversion pipe 42 or the second quick-setting agent diversion pipe 43;

[0049] The quick-setting agent atomizing tube 62 is connected at one end to the first one-way valve 61 and at the other end to the first inclined tube 51 or the second inclined tube 52;

[0050] The outer peripheral wall of the quick-setting agent atomizing tube 62 is connected to a second compressed air pipe 32.

[0051] Furthermore, the second compressed air pipe 32 and the accelerator atomizing pipe 62 are connected at an angle, and the central axis of the angle between the second compressed air pipe 32 and the accelerator atomizing pipe 62 coincides with the central axis of the first angled pipe 51 or the second angled pipe 52. This design ensures that the accelerator is dispersed into a mist by the high-pressure air output from the second compressed air pipe 32 to prevent clogging, and also enables the atomized accelerator to be quickly introduced into the concrete spraying pipe 1, allowing the accelerator to fully contact the concrete and preventing the concrete from clogging the second angled pipe 52, thus improving the mixing effect of the accelerator.

[0052] Thus, concrete is pumped to the concrete spraying pipe 1, then pressurized by compressed air input through the first compressed air pipe 31, and sprayed out from the high-wear-resistant nozzle 2. The concrete spraying pipe 1 and the high-wear-resistant nozzle 2 are connected by a sealed flange, and the pipe diameters are equal to ensure smooth concrete spraying. Furthermore, on one hand, the rear end of the accelerator main pipe 4 is divided into three pipes via a four-way diversion pipe 41, including a first accelerator diversion pipe 42 extending to the high-wear-resistant nozzle 2 and two second accelerator diversion pipes 43 at the concrete spraying pipe 1. These three pipes ensure thorough mixing of the accelerator and concrete. On the other hand, the rear ends of the three diversion pipes are connected to accelerator atomizing pipes 62, and the upper end of the accelerator atomizing pipe 62 is also connected to a second compressed air pipe 32, with the central axis of the second compressed air pipe 32 coinciding with the central axis of the inclined pipe. Figure 2 As shown, the accelerator is partially atomized through the accelerator atomizing pipe 62, and then fully dispersed into a mist by high-pressure air, and delivered to the concrete spraying pipe 1 or the high wear-resistant nozzle 2 to mix with the concrete.

[0053] During this process, on the one hand, the accelerator is dispersed and atomized by high-pressure air, effectively preventing the accelerator from clumping and clogging the pipes; on the other hand, the accelerator is rapidly pushed into the concrete spraying pipe 1 or the high wear-resistant nozzle 2 by compressed air, which can effectively improve the clogging problem caused by concrete flowing back into the first inclined pipe 51 or the second inclined pipe 52, thereby greatly reducing the risk of clogging and promoting full contact between the accelerator and the concrete, thus improving the hardening effect of the accelerator.

[0054] The nozzle of this application is easy to install and operate, with a low risk factor, effectively improving construction efficiency while ensuring safety. After the work is completed, the concrete spraying pipe 1 and the high wear-resistant nozzle 2 can be disassembled and flushed through the sealing flange, greatly improving the construction efficiency and safety of shotcrete.

[0055] In addition, refer to Figure 1 The first oblique tube 51 is threadedly connected to the high wear-resistant nozzle 2, and the insertion depth of the first oblique tube 51 in the high wear-resistant nozzle 2 is adjustable; for example, an outer screw cylinder is threaded through the outer wall of the high wear-resistant nozzle 2, and the first oblique tube 51 is sealed, slidably or rotatably disposed in the outer screw cylinder. The insertion depth of the first oblique tube 51 can be changed by rotating the outer screw cylinder or pulling the first oblique tube 51.

[0056] In this way, by controlling the insertion depth of the first inclined tube 51, the mixing depth of the accelerator and concrete can be adjusted, which can more reasonably promote the full mixing of the accelerator and concrete, maximize the effect of the accelerator, reduce the dosage of the accelerator, save costs, and achieve higher economic benefits.

[0057] Furthermore, in another feasible embodiment, referring to Figure 1 and Figure 2 A spiral sleeve 7 is coaxially installed inside the concrete spraying pipe 1. The connection between the first compressed air pipe 31 and the concrete spraying pipe 1 and the connection between the second inclined pipe 52 and the concrete spraying pipe 1 are both corresponding to the spiral seam of the spiral sleeve 7, so as to ensure that the compressed air in the first compressed air pipe 31 and the atomized quick-setting agent in the second inclined pipe 52 can fully enter the concrete spraying pipe 1 and mix with the concrete.

[0058] Specifically, the spiral sleeve 7 has a positioning groove at its end, and the inner wall of the concrete spraying pipe 1 has a positioning block that fits into the positioning groove. The spiral sleeve 7 is the same length as the concrete spraying pipe 1. Therefore, when the spiral sleeve 7 is inserted into the concrete spraying pipe 1 near the high-wear-resistant nozzle 2, the positioning block is inserted into the positioning groove, and then the concrete spraying pipe 1 and the high-wear-resistant nozzle 2 are locked together by the sealing flange. The spiral sleeve 7 is then locked within the concrete spraying pipe 1 and will not rotate, ensuring that the connection between the first compressed air pipe 31 and the concrete spraying pipe 1, and the connection between the second inclined pipe 52 and the concrete spraying pipe 1, always corresponds to the spiral seam of the spiral sleeve 7. After construction, the spiral sleeve 7 can be removed for flushing.

[0059] By incorporating the spiral sleeve 7 within the concrete spraying pipe 1, the concrete can be guided to form a swirling flow, reducing aggregate accumulation and decreasing the contact area between the concrete and the pipe wall. This reduces frictional resistance, improves fluidity, and lowers the risk of pipe blockage. Furthermore, the inner spiral sleeve 7 can be quickly installed as an emergency anti-blockage measure and can be disassembled and kept on standby during normal construction, allowing for immediate resolution of pipe blockage issues. Additionally, the swirling concrete improves the mixing efficiency of the accelerator and concrete and effectively prevents blockages in the accelerator pipe and the concrete spraying pipe 1, significantly enhancing the construction efficiency and safety of sprayed concrete.

[0060] Additionally, refer to Figure 1 The main pipeline 4 of the accelerator is equipped with a second one-way valve 81, which only allows the accelerator to flow in the direction close to the four-way diversion pipe 41; and the main pipeline 4 of the accelerator is equipped with an electromagnetic flow sensor 82, which is a non-contact design.

[0061] This design features three diversion pipes that effectively promote uniform mixing of the accelerator and concrete, improving performance and allowing for a reduction in accelerator dosage, thus saving costs. The electromagnetic flow sensor 82 on the main accelerator pipe 4 accurately measures changes in accelerator flow rate in real time and converts this into the actual dosage. A one-way valve prevents backflow of the accelerator. This design enables precise real-time monitoring of the accelerator dosage and prevents backflow from causing testing errors.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nozzle for efficient mixing and anti-clogging of a quick-setting agent and shotcrete, comprising a concrete spraying pipe and a high-wear-resistant nozzle connected together, wherein the end of the concrete spraying pipe away from the high-wear-resistant nozzle is connected to a first compressed air pipe, characterized in that, Also includes: The main pipeline for quick-setting agent is connected to a four-way branch pipe, and the other three joints of the four-way branch pipe are respectively connected to the first quick-setting agent branch pipe and two second quick-setting agent branch pipes. The accelerator injection pipeline is provided with three sets, which are respectively connected to the ends of the first accelerator distribution pipe and the two second accelerator distribution pipes; The first oblique tube extends one end into the high wear-resistant nozzle and the other end is connected to the output end of the quick-setting agent injection pipeline corresponding to the first quick-setting agent diversion tube. The second inclined pipe has two ends, one of which extends into the concrete spraying pipe and the other end is connected to the output end of the quick-setting agent spraying pipe corresponding to the second quick-setting agent diversion pipe.

2. The nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 1, characterized in that, Two second oblique nozzles are symmetrically distributed on both sides of the concrete spraying pipe.

3. The nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 1, characterized in that, The accelerator injection pipeline includes the following components connected in sequence: A first check valve is used to connect to either the first quick-setting agent distribution pipe or the second quick-setting agent distribution pipe. The quick-setting agent atomizing tube is connected at one end to the first one-way valve and at the other end to the first inclined tube or the second inclined tube; The outer peripheral wall of the quick-setting agent atomizing tube is connected to a second compressed air pipe.

4. The nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 3, characterized in that, The second compressed air pipe is connected to the accelerator atomizing pipe at an angle.

5. The nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 4, characterized in that, The central axis of the bevel between the second compressed air pipe and the accelerator atomizing pipe coincides with the central axis of the first bevel pipe or the second bevel pipe.

6. The nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 1, characterized in that, The first beveled tube is threadedly connected to the high wear-resistant nozzle, and the insertion depth of the first beveled tube in the high wear-resistant nozzle is adjustable.

7. The nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 1, characterized in that, A spiral sleeve is coaxially arranged inside the concrete spraying pipe. The connection between the first compressed air pipe and the concrete spraying pipe and the connection between the second oblique pipe and the concrete spraying pipe both correspond to the spiral seam of the spiral sleeve.

8. The nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 7, characterized in that, The spiral sleeve is provided with a positioning slot at its end, and the inner wall of the concrete spraying pipe is provided with a positioning block that is compatible with the positioning slot.

9. A nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 1, characterized in that, A second one-way valve is installed on the main pipeline of the accelerator, which only allows the accelerator to flow in the direction closer to the four-way diversion pipe.

10. A spray nozzle for efficient mixing and anti-clogging of quick-setting agent and shotcrete according to claim 1, characterized in that, An electromagnetic flow sensor is installed on the main pipeline of the quick-setting agent.

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