Concrete spraying device and construction method

Abstract

The concrete spraying device comprises a material conveying pump, a material mixing assembly, a material conveying pipe, a high-pressure spraying head and a stirring assembly, the feeding end of the material conveying pump communicates with the material mixing assembly through the material conveying pipe, and the discharging end of the material mixing assembly communicates with the high-pressure spraying head through the material conveying pipe; during working, cement, close to the inner wall of the pipeline, in the pipeline can be separated from cement in the center of the pipeline by arranging the flow dividing pipe, and the cement close to the inner wall of the pipeline and the cement in the center of the pipeline can be mixed with an accelerator by arranging the quantitative discharging assembly I and the quantitative discharging assembly II according to the flow speed of the cement in the mixing pipe; and therefore, the cement and the accelerator are mixed more uniformly while quantitative blanking of the accelerator is realized, and the cement and the accelerator are further mixed more uniformly by arranging an auger.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete spraying, in particular to a concrete spraying device and a construction method. Background Art

[0002] Concrete spraying technology is a core construction process for underground projects such as primary tunnel support and mine support. The performance of its equipment directly determines construction efficiency, structural quality, and work environment safety. my country's annual tunnel excavation mileage exceeds 10,000 kilometers, but traditional spraying equipment has a pipe blockage rate exceeding 15%, and a single maintenance shutdown takes ≥30 minutes, severely restricting construction continuity. Dust concentrations exceed occupational limits by 5-8 times, threatening worker health. However, as underground projects extend to deeper depths, larger cross-sections, and complex geological conditions, the technical bottlenecks of traditional concrete spraying equipment are becoming increasingly prominent. Existing patents and technical improvement solutions lack systematic design and are unable to meet the needs of efficient, low-cost, and intelligent construction.

[0003] Publication number CN202510096337.5 discloses a nozzle device for shotcrete, including a feed pipe, a liquid supply assembly, a nozzle assembly, and an air supply pipe. The nozzle assembly is detachably mounted on one end of the feed pipe, the liquid supply assembly is arranged in the feed pipe and is connected to the feed pipe, and the air supply pipe is arranged in the nozzle assembly and is connected to the feed pipe.

[0004] The above-mentioned prior art utilizes a conical guide block and blades within the nozzle body to more evenly impact the concrete with compressed air. However, cement particles are typically heavy and granular, which can easily settle when flowing through the pipe, resulting in insufficient contact between some cement and the accelerator. The viscosity of cement and the interaction between its particles limit its fluidity, hindering its uniform dispersion within the pipe. This lack of fluidity makes it difficult for the cement to fully mix with the accelerator. Therefore, even with compressed air impacting the concrete, it is difficult to fully mix the concrete and accelerator in the center of the pipe. Summary of the Invention

[0005] The object of the present invention is to provide a concrete spraying device and a construction method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A concrete spraying device includes a feed pump, a mixing assembly, a feed pipe, a high-pressure nozzle, and a stirring assembly. The feed end of the feed pump is connected to the mixing assembly through the feed pipe, and the discharge end of the mixing assembly is connected to the high-pressure nozzle through the feed pipe, wherein:

[0008] The mixing component includes a mixing tube, a funnel-shaped tube, a diverter tube, a pressurized feeding component, a quantitative feeding component I, a quantitative feeding component II and a microporous filter membrane. The funnel-shaped tube is arranged in the mixing tube and divides the mixing tube into a mixing part and a storage part. The mixing tube is connected to the feeding pump through the cylindrical feed end of the funnel-shaped tube. The diverter tube is arranged in the mixing part. One end of the diverter tube is a conical diverter end and the other end is a discharge end. Two pressurized feeding components are arranged on the side of the mixing tube, one of the pressurized feeding components is connected to the storage part through the quantitative feeding component I, and the other pressurized feeding component is connected to the diverter tube through the quantitative feeding component II. One of the two microporous filter membranes is arranged on the side of the conical end of the funnel-shaped tube, and the other is arranged at the discharge end of the diverter tube.

[0009] Preferably, the pressurized feeding assembly includes a material storage box, a booster pump, a delivery pipe and a one-way valve. The material storage box is arranged on the side of the mixing pipe, the discharge end of the material storage box is connected to the booster pump, the discharge end of the booster pump is provided with a delivery pipe, the discharge end of the delivery pipe is provided with a one-way valve, and one of the two delivery pipes in the pressurized feeding assembly is connected to the material storage part and the other is connected to the diversion pipe.

[0010] Preferably, the quantitative feeding component I includes an annular discharge pipe, a movable rod I, a baffle, a spring I, a ball joint rod I, a telescopic connecting rod and a switch sleeve. The annular discharge pipe is arranged in the storage part, and at least two of the movable rods I are movably arranged in the mixing pipe. One end of the movable rod I is provided with a baffle and is located in the mixing part, and the other end is located in the storage part and is connected to the inner wall of the mixing pipe through the spring I. The same number of ball joint rods I as the movable rod I is provided on the mixing pipe and is located in the storage part. The telescopic end of the telescopic connecting rod is hinged to the movable rod I, and the other end is hinged to the switch sleeve. The side of the telescopic connecting rod is connected to the ball pair of the ball joint rod I, and the switch sleeve is movably fitted on the mixing pipe.

[0011] Preferably, the quantitative feeding component II includes a movable rod II, a baffle II, a movable plate, a spring II, a ball joint rod I and a double-headed telescopic connecting rod. The two movable rods II are movably arranged in the mixing tube. One end of the movable rod II is located in the mixing part and is provided with a baffle II, and the other end is located in the diversion tube. The two movable plates are arranged in the diversion tube through the spring II. The two ball joint rods I are arranged in the diversion tube. The ball pair of the ball joint rod I is connected to the double-headed telescopic connecting rod. One end of the double-headed telescopic connecting rod is hinged to the movable rod II, and the other end is hinged to the movable plate.

[0012] Preferably, the mixing assembly further comprises an auger, which is arranged in the mixing part and located on the side of the diversion pipe.

[0013] Preferably, the discharge port of the stirring assembly is connected to the feed port of the feed pump through a feed pipe.

[0014] A construction method for concrete spraying, the construction steps are:

[0015] S1. When using, mix cement, sand and gravel according to the designed ratio and pour them into the mixing assembly through the feeding port of the mixing assembly;

[0016] S2. After the cement is mixed, it is transported from the discharge port to the feed pump;

[0017] S3, cement is delivered to the mixing assembly through the delivery pump;

[0018] S4. Cement is mixed with an accelerating agent in a mixing assembly;

[0019] S5. After the cement and accelerator are evenly mixed, they will enter the high-pressure nozzle, under the action of the high-pressure nozzle, the cement will be sprayed out at high pressure.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention discloses a concrete spraying device and a construction method. During operation, a diverter pipe is provided to separate cement near the inner wall of a pipeline from cement in the center of the pipeline. Furthermore, a quantitative feeding component I and a quantitative feeding component II are provided to respectively mix the cement near the inner wall of the pipeline and the cement in the center of the pipeline with an accelerator according to the flow rate of the cement in the mixing pipe. This allows the cement and the accelerator to be mixed more evenly while achieving quantitative feeding of the accelerator. Furthermore, an auger is provided to further ensure that the cement and the accelerator are mixed more evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0023] Figure 2 3D schematic diagram of the mixing assembly of the present invention;

[0024] Figure 3 Schematic diagram of the interior of the mixing assembly of the present invention;

[0025] Figure 4 3D schematic diagram of the diverter pipe in the present invention;

[0026] Figure 5 for Figure 3 Schematic diagram of the middle section A;

[0027] Figure 6 for Figure 3 Schematic diagram of middle section B;

[0028] Figure 7 1 is an internal cross-sectional view of the mixing assembly of the present invention.

[0029] In the figure: 1 feeding pump, 2 mixing component, 3 feeding pipe, 4 high-pressure nozzle, 5 stirring component, 21 mixing pipe, 22 funnel-shaped pipe, 23 diverter pipe, 24 pressurized feeding component, 25 quantitative feeding component I, 26 quantitative feeding component II, 27 microporous filter membrane, 28 auger, 211 mixing part, 212 storage part, 231 diverter end, 232 discharge end, 241 storage box, 242 booster pump, 243 feeding pipe, 244 one-way valve, 251 annular discharge pipe, 252 movable rod I, 253 baffle, 254 spring I, 255 ball joint rod I, 256 telescopic connecting rod, 257 switch sleeve, 261 movable rod II, 262 baffle II, 263 movable plate, 264 spring II, 265 ball joint rod I, 266 double-head telescopic connecting rod. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example:

[0032] See also Figures 1 to 7 , the present invention provides a technical solution:

[0033] A concrete spraying device includes a feed pump 1, a mixing assembly 2, a feed pipe 3, a high-pressure nozzle 4, and a stirring assembly 5. The feed end of the feed pump 1 is connected to the mixing assembly 2 via the feed pipe 3. The feed pump 1 is used to transport cement into the mixing assembly 2. The discharge end of the mixing assembly 2 is connected to the high-pressure nozzle 4 via the feed pipe 3. The high-pressure nozzle 4 can be connected to an external booster device to form a spray beam under the action of high-pressure air.

[0034] The mixing assembly 2 includes a mixing tube 21, a funnel-shaped tube 22, a diversion tube 23, a pressurized feeding assembly 24, a quantitative feeding assembly I 25, a quantitative feeding assembly II 26 and a microporous filter membrane 27. The funnel-shaped tube 22 is arranged in the mixing tube 21 and divides the mixing tube 21 into a mixing part 211 and a storage part 212. The space between the outer wall of the funnel-shaped tube 22 and the inner wall of the mixing tube 21 is the storage part 212 for storing cement, and the space between the inner wall of the funnel-shaped tube 22 and the inside of the mixing tube 21 constitutes the mixing part 211 for mixing cement and accelerator. The mixing pipe 21 is connected to the feed pump 1 through the cylindrical feed end of the funnel-shaped pipe 22. A blocking portion is provided between the mixing pipe 21 and the outer wall of the cylindrical feed end of the funnel-shaped pipe 22, so that cement can only enter the mixing part 211 from the cylindrical feed end of the funnel-shaped pipe 22, but will not enter the storage part 212. The diverter pipe 23 is fixed in the mixing part 211. One end of the diverter pipe 23 is a tapered diverter end 231 and the other end is a discharge end 232. The cement can be diverted by passing through the diversion end 231 of the diversion pipe 23, so that the cement in the center of the cement flow column will be close to the outer wall of the diversion pipe 23. Two pressurized feeding components 24 are arranged on the side of the mixing pipe 21, and the discharge end of one pressurized feeding component 24 is connected to the storage part 212, and the discharge end of the other pressurized feeding component 24 is connected to the diversion pipe 23. The pressurized feeding component 24 is used to pressurize and transport the quick-setting agent to the storage part 212 and the diversion pipe 23. One of the pressurized material feeding components 24 is connected to the material storage section 212 via a quantitative discharge component I 25, and the other pressurized material feeding component 24 is connected to the diversion pipe 23 via a quantitative discharge component II 26. The quantitative discharge component I 25 is used to control the flow rate of the accelerator in the material storage section 212, and the quantitative discharge component II is used to control the flow rate of the accelerator in the diversion pipe 23. Two microporous filter membranes 27 are provided, one of which is located on the side of the tapered end of the funnel-shaped tube 22, and the other is located at the discharge end 232 of the diversion pipe 23. The provision of the microporous filter membranes 27 allows the accelerator to enter the mixing section 211 through the microporous filter membrane 27, but cement does not pass through the microporous filter membrane 27.

[0035] As a preferred embodiment, the particle size of cement particles in the microporous filter membrane 27 is generally between 1 and 100 microns, while the particle size of the accelerator, if in liquid form, is at the molecular level. Therefore, a microporous filter membrane with a pore size between 0.1 and 1 micron can effectively retain cement particles while allowing the accelerator to pass through. The model of the microporous filter membrane 27 can be MILLIPORE GVHP04700.

[0036] As a preferred embodiment, the feed pump 1 preferably adopts auger delivery. The feed pump 1 is a conventional delivery mechanism. Therefore, those skilled in the art have reason and motivation to reasonably choose an adaptive solution to solve the cement delivery problem. Its principles and detailed technical solutions will not be elaborated here.

[0037] As a preferred embodiment, the high-pressure nozzle 4 is a conventional technical means for those skilled in the art in the field of concrete spraying, and its principle and solution will not be described in detail here.

[0038] As a preferred embodiment, the pressurized feeding assembly 24 includes a storage box 241, a booster pump 242, a delivery pipe 243 and a one-way valve 244. The storage box 241 is arranged on the side of the mixing pipe 21. The storage box 241 is used to store the accelerator. The discharge end of the storage box 241 is connected to the booster pump 242. The booster pump 242 is used to increase the flow pressure of the accelerator so that the accelerator can overcome the pressure in the mixing part 211 and enter the mixing part 211 from the microporous filter membrane 27. The discharge end of the booster pump 242 is provided with a delivery pipe 243, and the discharge end of the delivery pipe 243 is provided with a one-way valve 244. The one-way valve 244 is provided to prevent water in the cement from flowing back into the storage box 241 and contaminating the accelerator. One of the delivery pipes 243 in the two pressurized feeding assemblies 23 is connected to the storage part 212, and the other is connected to the diversion pipe 23.

[0039] As a preferred embodiment, the quantitative unloading assembly I25 includes an annular discharge pipe 251, a movable rod I252, a baffle 253, a spring I254, a ball joint rod I255, a telescopic connecting rod 256 and a switch sleeve 257. The annular discharge pipe 251 is arranged in the storage portion 212. The annular discharge pipe 251 is provided with a discharge port near the circumference of the funnel-shaped tube 22. By setting the annular discharge pipe 251, the quick-setting agent can be evenly added into the storage portion 212. At least two movable rods I252 are movably arranged in the mixing tube 21. The movable rod I252 passes through the cylindrical feed port of the funnel-shaped tube 22. The side wall of the cylindrical feed end of the funnel-shaped tube 22 is connected to the side wall of the cylindrical feed end of the funnel-shaped tube 22 in a linear movable pair. The movable rod I 252 moves in the radial direction of the funnel-shaped tube 22. One end of the movable rod I 252 is equipped with a baffle 253 and is located within the mixing section 211. The other end is located within the storage section 212 and is connected to the inner wall of the mixing tube 21 via a spring I 254. As cement flows, the lateral pressure of the cement pushes against the baffle 253, which in turn pushes against the movable rod I 252 to compress the spring I 254. The faster the cement flow rate, the greater the lateral pressure, and the greater the compression of the spring I 254. The same number of ball joints I 255 as the movable rods I 252 are installed on the mixing tube 21 and located within the storage section 212. The telescopic connecting rod 256 has its telescopic end hinged to the movable rod I 252 and its other end hinged to the switch sleeve 257. The side of the telescopic connecting rod 256 is spherically connected to the ball joints I 255. The telescopic link 256 can rotate around the ball joint. When the movable rod I 252 compresses the spring I 254, the telescopic link 256 is driven to rotate, thereby driving the switch sleeve 257 away from the annular discharge pipe 251, thereby increasing the discharge port of the annular discharge pipe 251 and the flow rate of the quick-setting agent. The switch sleeve (257) is movably engaged with the mixing pipe (21). The switch sleeve (257) forms a linear movable pair on the axis of the mixing pipe (21).

[0040] As a preferred embodiment, the quantitative feeding assembly II26 includes a movable rod II261, a baffle II262, a movable plate 263, a spring II264, a ball joint rod I265 and a double-headed telescopic connecting rod 266. The two movable rods II261 are movably arranged in the mixing tube 21. The mixing tube 21 passes through the outer wall of the diversion tube 23. The movable rod II261 forms a movable pair on the outer wall of the diversion tube 23. The movement direction of the movable rod I252 is the axial direction of the mixing tube (21). One end of the movable rod II261 is located in the mixing part 211 and is provided with a baffle II262, and the other end is located in the diversion tube 23. When the cement flows, the lateral pressure of the cement flow will push the two baffles II262 close to each other. Two movable plates 263 are mounted within the diverter tube 23 via springs II 264. The movable plates 263 form a radially movable pair within the diverter tube 23. Two ball joints I 265 are mounted within the diverter tube 23. The ball joints I 265 are connected to a double-ended telescopic link 266, which can pivot on the ball joints I 265. One end of the double-ended telescopic link 266 is hinged to the movable rod II 261, and the other end is hinged to the movable plates 263. When the two baffles II 262 approach each other, they rotate the two double-ended telescopic links 266, which in turn moves the two movable plates 263 away from each other. This increases the internal diameter of the accelerator in the diverter tube 23, thereby increasing the discharge rate of the accelerator.

[0041] As a preferred embodiment, the mixing assembly 2 further includes an auger 28, which is disposed within the mixing section 211 and on the side of the diverter pipe 23. The provision of the auger 28 allows for a more uniform mixing of the cement and the accelerator. The mixing and conveying of the auger 28 is a conventional technique in the art, and its rotational drive is also a conventional technique, which will not be described in detail here.

[0042] As a preferred embodiment, the discharge port of the stirring assembly 5 is communicated with the feed port of the feed pump 1 through the feed pipe 3. The stirring assembly 5 is used to mix cement, water and aggregate.

[0043] As a preferred embodiment, the stirring assembly 5 is used to stir cement, which is a conventional technical means for those skilled in the art, and its principle and solution will not be described in detail here.

[0044] The present invention provides a concrete spraying construction method, which comprises the following steps:

[0045] S1. When in use, mix cement, sand and gravel according to the designed ratio and pour them into the mixing assembly 5 through the feed port of the mixing assembly 5;

[0046] S2. Start the feeding pump 1 to feed the stirred cement into the mixing pipe 21 through the funnel-shaped pipe 22. At the same time, start the booster pump 242 to add the quick-setting agent in the storage box 241 into the annular discharge pipe 251 and the diversion pipe 23 through the feeding pipe 243.

[0047] S3. When cement passes through the funnel-shaped tube 22, the cement pushes the baffle 253 to drive the telescopic connecting rod 256 to rotate on the ball joint rod I 255 through the movable rod I 252, thereby driving the ball joint rod I 255 to move away from the side of the annular discharge pipe 251, thereby increasing the discharge port of the annular discharge pipe 251, and the accelerator flows from the annular discharge pipe 251 into the storage part 212, and then passes through the microporous filter membrane 27 into the mixing part 211, and is then mixed with the cement on the outside.

[0048] S4. When cement passes through the diversion pipe 23, the cement will be diverted by the diversion pipe 23, so that the cement away from the inner wall of the mixing pipe 21 and not mixed with the accelerator will surround the outside of the diversion pipe 23. At this time, the cement outside the diversion pipe 23 will push the baffle II 262, and drive the double-headed telescopic connecting rod 266 to rotate on the ball joint rod I 265 through the movable rod II 261, thereby pulling the two movable plates 263 away from each other, so that the discharge port of the accelerator is enlarged, and the accelerator passes through the microporous filter membrane 27 at the discharge end 232 of the diversion pipe 23 and is mixed with the cement that is not mixed with the accelerator and surrounds the outside of the diversion pipe 23. By adding the accelerator twice, the inside and outside of the cement are mixed with the accelerator. After the cement and the accelerator are mixed, they will pass through the auger 28, so that the mixture of the cement and the accelerator is more uniform.

[0049] S5. After the cement and the quick-setting agent are evenly mixed, they will enter the high-pressure nozzle 4, under the action of the high-pressure nozzle 4, the cement will be sprayed out at high pressure.

[0050] Working principle of the present invention:

[0051] When in use, cement, sand and gravel are mixed according to the designed ratio and poured into the mixing assembly 5 through the feed port of the mixing assembly 5;

[0052] The feed pump 1 is started to feed the stirred cement into the mixing pipe 21 through the funnel-shaped pipe 22. At the same time, the booster pump 242 is started to add the quick-setting agent in the storage box 241 into the annular discharge pipe 251 and the diversion pipe 23 through the feed pipe 243.

[0053] When cement passes through the funnel-shaped tube 22, the cement will push the baffle 253 to drive the telescopic connecting rod 256 to rotate on the ball joint rod Ⅰ 255 through the movable rod Ⅰ 252, thereby driving the ball joint rod Ⅰ 255 to move away from the side of the annular discharge pipe 251, thereby increasing the discharge port of the annular discharge pipe 251, and the quick-setting agent flows from the annular discharge pipe 251 to the storage part 212, and then passes through the microporous filter membrane 27 into the mixing part 211, and then mixes with the cement on the outside.

[0054] When cement passes through the diversion pipe 23, the cement will be diverted by the diversion pipe 23, so that the cement away from the inner wall of the mixing pipe 21 and not mixed with the accelerator will surround the outside of the diversion pipe 23. At this time, the cement outside the diversion pipe 23 will push the baffle II 262, and drive the double-headed telescopic connecting rod 266 to rotate on the ball joint rod I 265 through the movable rod II 261, thereby pulling the two movable plates 263 away from each other, so that the discharge port of the accelerator is enlarged, and the accelerator passes through the microporous filter membrane 27 at the discharge end 232 of the diversion pipe 23 and is mixed with the cement that is not mixed with the accelerator and surrounds the outside of the diversion pipe 23. By adding the accelerator twice, the inside and outside of the cement are mixed with the accelerator. After the cement and the accelerator are mixed, they will pass through the auger 28, so that the mixture of the cement and the accelerator is more uniform.

[0055] After the cement and the quick-setting agent are evenly mixed, they will enter the high-pressure nozzle 4, under the action of the high-pressure nozzle 4, the cement will be sprayed out at high pressure.

[0056] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A concrete spraying device, comprising a feed pump (1), a mixing assembly (2), a feed pipe (3), a high-pressure nozzle (4) and a stirring assembly (5), wherein the feed end of the feed pump (1) is connected to the mixing assembly (2) through the feed pipe (3), and the discharge end of the mixing assembly (2) is connected to the high-pressure nozzle (4) through the feed pipe (3), and is characterized in that: The mixing assembly (2) comprises a mixing tube (21), a funnel-shaped tube (22), a diverter tube (23), a pressurized feeding assembly (24), a quantitative feeding assembly I (25), a quantitative feeding assembly II (26) and a microporous filter membrane (27). The funnel-shaped tube (22) is arranged in the mixing tube (21) and divides the mixing tube (21) into a mixing portion (211) and a storage portion (212). The mixing tube (21) is connected to the feeding pump (1) through the cylindrical feeding end of the funnel-shaped tube (22). The diverter tube (23) is arranged in the mixing portion (211). The diverter tube ( 23) has a conical diversion end (231) at one end and a discharge end (232) at the other end, two pressurized feeding components (24) are arranged on the side of the mixing tube (21), one of the pressurized feeding components (24) is connected to the storage part (212) through the quantitative discharge component I (25), and the other pressurized feeding component (24) is connected to the diversion tube (23) through the quantitative discharge component II (26), and two microporous filter membranes (27) are arranged, one of which is arranged on the side of the conical end of the funnel-shaped tube (22) and the other is arranged at the discharge end (232) of the diversion tube (23).

2. A concrete spraying device according to claim 1, characterized in that: The pressurized material delivery assembly (24) comprises a material storage box (241), a booster pump (242), a delivery pipe (243) and a one-way valve (244); the material storage box (241) is arranged on the side of the mixing pipe (21); the discharge end of the material storage box (241) is connected to the booster pump (242); the discharge end of the booster pump (242) is provided with a delivery pipe (243); the discharge end of the delivery pipe (243) is provided with a one-way valve (244); one of the delivery pipes (243) in the two pressurized material delivery assemblies (23) is connected to the material storage portion (212), and the other is connected to the diversion pipe (23).

3. A concrete spraying device according to claim 2, characterized in that: The quantitative discharging assembly I (25) comprises an annular discharging pipe (251), a movable rod I (252), a baffle (253), a spring I (254), a ball joint rod I (255), a telescopic connecting rod (256) and a switch sleeve (257). The annular discharging pipe (251) is arranged in the material storage part (212). At least two movable rods I (252) are movably arranged in the mixing pipe (21). One end of the movable rod I (252) is provided with a baffle (253) and is located in the mixing part (211), and the other end is located in the mixing part (211). The material storage portion (212) is connected to the inner wall of the mixing tube (21) through a spring I (254). The ball joint rods I (255) having the same number as the movable rods I (252) are provided on the mixing tube (21) and located in the material storage portion (212). The telescopic end of the telescopic connecting rod (256) is hinged to the movable rod I (252) and the other end is hinged to the switch sleeve (257). The side of the telescopic connecting rod (256) is connected to the ball pair of the ball joint rod I (255), and the switch sleeve (257) is movably fitted on the mixing tube (21).

4. A concrete spraying device according to claim 3, characterized in that: The quantitative feeding assembly II (26) includes a movable rod II (261), a baffle II (262), a movable plate (263), a spring II (264), a ball joint rod I (265) and a double-headed telescopic connecting rod (266). The two movable rods II (261) are movably arranged in the mixing tube (21). One end of the movable rod II (261) is located in the mixing part (211) and is provided with a baffle II (262), and the other end is located in the diversion tube (23). The two movable plates (263) are arranged in the diversion tube (23) through the spring II (264). The two ball joint rods I (265) are arranged in the diversion tube (23). The ball pair of the ball joint rod I (265) is connected to the double-headed telescopic connecting rod (266). One end of the double-headed telescopic connecting rod (266) is hinged to the movable rod II (261) and the other end is hinged to the movable plate (263).

5. A concrete spraying device according to claim 4, characterized in that: The mixing assembly (2) further comprises an auger (28), wherein the auger (28) is arranged in the mixing portion (211) and located on the side of the diversion pipe (23).

6. A concrete spraying device according to claim 4, characterized in that: The discharge port of the stirring assembly (5) is connected to the feed port of the feed pump (1) through the feed pipe (3).

7. A method for spraying concrete, for implementing the concrete spraying device according to any one of claims 1 to 6, characterized in that: S1. When in use, cement, sand and gravel are mixed according to the designed proportion and poured into the stirring assembly (5) through the feed port of the stirring assembly (5); S2, after the cement is mixed, it is transported from the discharge port to the feed pump (1); S3, cement is transported to the mixing assembly (2) through the feed pump (1); S4, cement is mixed with an accelerating agent in the mixing assembly (2); S5. After the cement and the quick-setting agent are evenly mixed, they enter the high-pressure nozzle (4), where the cement is sprayed out at high pressure.

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