Concrete spraying device for forming mist spraying by rotating and mixing powder and mixing water

Abstract

The invention relates to the technical field of 3D printing equipment, and provides a concrete spraying device capable of rotationally mixing powder and mixing water to form mist spraying, the concrete spraying device comprises a powder bin cover plate, a powder bin, a water bin, a speed increasing bin, a mixing bin and a gathering bin which are arranged in sequence; the powder bin cover plate is fixedly arranged on the powder bin; a water suction pipe joint, a powder suction pipe joint and a blowing pipe are arranged on the powder bin cover plate; an annular passage and a plurality of dry powder passages are formed between the powder bin and the powder bin cover plate; the blowing pipe extends into the powder bin, and a powder flow pipe is embedded in the rear end of the blowing pipe; the powder flow pipe, the blowing pipe, the annular passage and the dry powder passage are communicated with one another; a conical hole penetrates through the water bin, the large end face of the conical hole is attached to the powder bin, and a first annular gap is formed between the small end face of the conical hole and the tail end of the powder flow pipe; and the conical hole is communicated with the powder bin water channel. A retarder does not need to be added, time and equipment for stirring and conveying the slurry do not need to be additionally added, the equipment cost is low, and the device can adapt to spraying of the quick-setting concrete material.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing equipment, and in particular to a concrete spraying device for spraying powder and mixing water in a rotating manner. Background Art

[0002] Traditional injection devices require the materials to be mixed with mixing water in advance, and the mixed slurry is pumped to the nozzle by a pump. Due to the need for mixing in advance, a retarder needs to be added to prevent the slurry from setting quickly, which increases production costs. In addition, mixing and pumping the slurry takes a long time and requires additional auxiliary equipment.

[0003] In line with the country's requirements for emission reduction and carbon reduction, researchers will use MgO with a lower calcination temperature or unburned MgO to prepare magnesium phosphate cement (MPC). Low-calcined magnesium oxide is made by calcining magnesium carbonate between 700°C and 1000°C and then grinding it. Due to the low calcination temperature, the generated MgO is more active and the reaction rate is faster when participating in the hydration reaction. Unburned MgO is a residual product of chemical production. If it can be used directly, its application prospects are also very broad. Due to the addition of low-calcined MgO, the initial setting time of MPC will be shortened to less than 1 minute, making traditional spraying equipment unsuitable for the use of special performance concrete (such as magnesium phosphate cement, etc.).

[0004] In summary, the traditional spraying device not only increases the production cost, but also limits the spraying technology of fast-setting concrete materials (such as magnesium phosphate cement, etc.). Summary of the invention

[0005] The present invention mainly solves the technical problems that the mixing and conveying of slurry by traditional concrete spraying devices requires time and additional equipment, and that retarders need to be added to avoid rapid setting, which increases production costs, and the spraying technology of rapid setting concrete materials is limited. A concrete spraying device is proposed, which rotates and mixes powder and mixing water to form a mist spray. There is no need to add retarders, and there is no need to increase the time and equipment for mixing and conveying slurry. The equipment cost is low and can adapt to the spraying of rapid setting concrete materials.

[0006] The present invention provides a concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist-like spray, comprising a powder bin cover, a powder bin, a water bin, a speed increasing bin, a mixing bin and a gathering bin which are arranged in sequence;

[0007] The powder bin cover is fastened and mounted on the powder bin; a water suction pipe joint, a powder suction pipe joint and a blow pipe are arranged on the powder bin cover; the blow pipe is externally connected to compressed air;

[0008] An annular passage and a plurality of dry powder passages are formed between the powder bin and the powder bin cover plate; the blow pipe extends into the powder bin, and a powder flow pipe is embedded at the rear end of the blow pipe; and the powder flow pipe, the blow pipe, the annular passage and the dry powder passage are connected; a powder bin water channel is provided on the powder bin;

[0009] A conical hole is provided through the water bin, the large end surface of the conical hole is in contact with the powder bin, and the small end surface of the conical hole forms a first annular gap with the end of the powder flow tube; the conical hole is connected to the water channel of the powder bin;

[0010] A primary mixing tube is embedded in the central hole of the speed increasing chamber; the primary mixing tube is connected with the powder flow tube; a speed increasing chamber port cover is embedded at the end of the speed increasing chamber, the speed increasing chamber port cover and the speed increasing chamber form an annular cavity, and the speed increasing chamber port cover and the end of the primary mixing tube form a second annular gap; the annular cavity is externally connected to compressed air;

[0011] The mixing chamber has a central channel, which is connected to the primary mixing pipe; the outer periphery of the central channel has a narrow gap and a mixing chamber cavity; the mixing chamber cavity is connected to compressed air;

[0012] The feeding end of the gathering bin is inlaid with a gathering tube, the discharging end of the gathering bin is tightly fitted with a nozzle, and the discharging end of the gathering tube is inlaid on the nozzle; a gathering bin cavity is formed between the gathering bin and the gathering tube; and the gathering bin cavity is externally connected to compressed air.

[0013] Preferably, the powder bin cover plate is provided with a blow pipe via a blow pipe fixing pipe joint.

[0014] Preferably, the water suction pipe joint is connected to the water tank via a water pipe;

[0015] The powder suction pipe joint is connected to the silo through a hose.

[0016] Preferably, the blowpipe is connected to the air path distribution integrated block through a hose; and the air path distribution integrated block is connected to an air compressor.

[0017] Preferably, the diameter of the powder flow tube is larger than the diameter of the blow tube.

[0018] Preferably, a sealing ring is provided on the outer ring of the tapered hole.

[0019] Preferably, the diameter of the primary mixing tube is larger than the diameter of the powder flow tube.

[0020] Preferably, a front end cyclone impeller and a rear end cyclone impeller are embedded in the mixing bin; the centers of the front end cyclone impeller and the rear end cyclone impeller have a central channel; the front end cyclone impeller and the rear end cyclone impeller respectively have a plurality of blades; the blades of the front end cyclone impeller and the blades of the rear end cyclone impeller are facing each other and are staggered; and narrow gaps are formed between adjacent blades; the front end cyclone impeller and the rear end cyclone impeller form a mixing bin cavity with the inner wall of the mixing bin.

[0021] Preferably, surrounding small holes are arranged inside the nozzle.

[0022] Preferably, the annular cavity is connected to the gas path distribution integrated block via a hose;

[0023] The mixing chamber cavity is connected to the gas path distribution integrated block through a hose;

[0024] The gathering bin cavity is connected to the gas path distribution integrated block through a hose.

[0025] The concrete spraying device provided by the present invention for spraying powder and mixing water in a rotating manner has the following advantages over the prior art:

[0026] 1. According to the Venturi effect, compressed air is used to form negative pressure, and dry powder materials are sucked in to form a high-speed powder mist flow. The negative pressure formed by the powder mist flow then sucks in mixing water and blows it away to form water mist. The two mist materials are then rotated and mixed by compressed air to form mist, which is then gathered and sprayed out from the injection port. The present invention does not require the addition of a retarder, and does not require additional time and equipment for mixing and conveying slurry. The equipment cost is low and can adapt to the injection of fast-setting concrete materials.

[0027] 2. While avoiding the material agglomeration and adhesion to the tube wall during the spraying process, the capacity and load of the required air compressor are greatly reduced due to the small diameter of the blowpipe and the small diameter and number of auxiliary air inlet pipes at all levels. Each bin section adopts a modular design, which is convenient for disassembly, cleaning and maintenance; the bin sections are bolted and sealed after assembly to avoid dust leakage.

[0028] 3. The negative pressure generated by the compressed air blowing process is used to absorb water and dry powder into the nozzle, eliminating the powder conveying equipment and reducing the size of the device of the present invention. The powder intake is controlled by the size of the powder tube diameter, and the water intake is controlled by the flow meter, so that the dry powder material can be fully mixed to achieve "on-demand material collection". According to the water-cement ratio formula of the concrete material, a small water tank and a small-capacity powder tank can be equipped, which can be carried with you or placed on a small automatic carrier to achieve handheld spraying application or intelligent application.

[0029] 4. The present invention does not need to add a retarder, and does not need to increase the time and equipment for mixing and transferring the slurry, and the equipment cost is low. It can solve the problem of limited technology for the spraying of fast-setting concrete materials (especially magnesium phosphate cement), so that ultra-fast-setting concrete (especially magnesium phosphate cement MPC) materials can form a fast-setting coating on the surface of the sprayed object for a long time, which can adapt to the spraying of fast-setting concrete materials and improve production efficiency.

[0030] 5. The present invention can match the characteristics of MPC materials such as extremely short setting time, high viscosity, and high heat dissipation, and is particularly suitable for construction environments with extreme conditions such as narrow spaces and low temperatures (above -10°C). It is suitable for jet printing of ultra-fast setting concrete materials (magnesium phosphate cement), especially for the application of MPC anti-corrosion, anti-rust, and fire-proof coatings in special environments (low temperature, saline-alkali environment, radiation, etc.), providing a feasible approach. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an axial cross-sectional view of a concrete spraying device provided by the present invention for spraying powder and mixing water in a rotating manner;

[0032] Figure 2 It is a schematic diagram of the principle of a concrete spraying device provided by the present invention for rotating and mixing powder and mixing water to form mist-like spraying;

[0033] Figure 3 is an axial cross-sectional view of the powder bin provided by the present invention;

[0034] Figure 4 is a three-dimensional diagram of a powder bin provided by the present invention;

[0035] Figure 5 It is a schematic diagram of the assembly of the powder bin cover plate and the powder bin provided by the present invention;

[0036] Figure 6 is an axial cross-sectional view of the water tank provided by the present invention;

[0037] Figure 7 is an axial cross-sectional view of the speed increasing chamber provided by the present invention;

[0038] Figure 8 is an axial cross-sectional view of the mixing bin provided by the present invention;

[0039] Fig. 9 It is a schematic structural diagram of the front cyclone impeller and the rear cyclone impeller of the mixing bin provided by the present invention;

[0040] Fig.10 It is a schematic diagram of the assembly of the front cyclone impeller and the rear cyclone impeller of the mixing bin provided by the present invention;

[0041] Fig.11is an axial cross-sectional view of the gathering bin provided by the present invention;

[0042] Fig.12 It is a three-dimensional diagram of the gathering bin provided by the present invention.

[0043] Reference numerals: 101. powder bin cover; 102. water suction pipe joint; 103. blow pipe fixed pipe joint; 104. blow pipe; 105. powder suction pipe joint; 201. powder bin; 202. powder flow pipe; 203. annular passage; 204. dry powder passage; 205. powder bin water passage; 206. powder flow pipe positioning hole; 301. water bin; 302. sealing ring; 303. conical hole; 304. first annular gap; 401. speed increasing bin ; 402. primary mixing tube; 403. speed increasing chamber port cover; 404. annular cavity; 405. second annular gap; 501. mixing chamber; 502. front cyclone impeller; 503. terminal cyclone impeller; 504. mixing chamber cavity; 505. narrow and long gap; 506. center channel; 507. positioning pin hole; 601. gathering chamber; 602. gathering tube; 603. nozzle; 604. gathering chamber cavity; 605. surrounding small hole. DETAILED DESCRIPTION

[0044] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all the contents.

[0045] like Figure 1-2 As shown, an embodiment of the present invention provides a concrete spraying device for rotating and mixing powder and mixing water to form a mist spray, including a powder bin cover 101, a powder bin 201, a water bin 301, a speed increasing bin 401, a mixing bin 501 and a gathering bin 601 which are arranged in sequence.

[0046] The powder bin cover plate 101 is fastened and installed on the powder bin 201 by bolts; the powder bin cover plate 101 is provided with a water suction pipe joint 102, a powder suction pipe joint 105 and a blow pipe 104; the blow pipe 104 is connected to compressed air. A blow pipe hole is reserved at the center of the powder bin cover plate 101, and the powder bin cover plate 101 is provided with a blow pipe 104 through a blow pipe fixing pipe joint 103. The water suction pipe joint 102 is connected to the water tank through a water pipe to draw mixing water from the external water tank. The powder suction pipe joint 105 is connected to the silo through a hose to draw dry powder from the external silo.

[0047] like Figure 3-5As shown, an annular passage 203 and a plurality of dry powder passages 204 are formed between the powder bin 201 and the powder bin cover 101; the blow pipe 104 extends into the powder bin 201, and a powder flow pipe 202 is embedded at the rear end of the blow pipe 104; the diameter of the powder flow pipe 202 is larger than the diameter of the blow pipe 104. A powder flow pipe positioning hole 206 is provided on the powder bin 201, and the powder flow pipe 202 is installed through the powder flow pipe positioning hole 206. The powder flow pipe 202, the blow pipe 104, the annular passage 203 and the dry powder passage 204 are connected; a powder bin water channel 205 is provided on the powder bin 201, so that the mixing water enters the water bin 301 through the powder bin 201.

[0048] In the middle section of the powder bin 201, that is, the hole between the blowpipe 104 and the powder flow tube 202, there are multiple places connected to the dry powder passage 204 and the outer annular passage 203. In the process of compressed air passing through the powder bin 201 at high speed through the small-diameter blowpipe 104 and entering the powder flow tube 202, the Venturi effect condition is met, and the air in multiple passages is carried away by the airflow in the blow hole, forming a negative pressure in the dry powder passage; the negative pressure in the annular passage 203 connecting multiple dry powder passages 204 will increase many times, and the dry powder will be sucked in from the powder inlet with strong suction. The dry powder enters the powder flow tube 202 with the high-speed airflow and is blown away, forming a high-speed powder mist flow.

[0049] like Figure 6 As shown, a conical hole 303 is provided through the water bin 301, and the large end face of the conical hole 303 is in contact with the powder bin 201. A sealing ring 302 is provided on the outer ring of the large end face of the conical hole 303 to prevent external air from leaking in. The small end face of the conical hole 303 forms a first annular gap 304 with the end of the powder flow tube 202. The first annular gap 304 and the front end of the primary mixing tube 402 of the speed increasing bin 401 again form a shape feature that produces a Venturi effect, and a negative pressure zone is formed around the end of the powder flow tube 202. The conical hole 303 is connected to the powder bin water channel 205. The conical hole 303 will amplify the negative pressure formed at the small end face in the conical hole 303, and generate a large suction force at the water suction port of the large end face of the conical hole 303, so as to suck the mixing water into the water bin 301. The water intake can be accurately controlled by an external flow meter. After the mixing water enters the primary mixing pipe 402 through the first annular gap 304, it is immediately blown into water mist by the powder mist flow and covers the outside of the powder mist flow to form a preliminary powder-water mixing flow.

[0050] like Figure 7As shown, a primary mixing tube 402 is embedded in the central hole of the speed increasing chamber 401; the primary mixing tube 402 is connected to the powder flow tube 202; the diameter of the primary mixing tube 402 is larger than the diameter of the powder flow tube 202. A speed increasing chamber port cover 403 is embedded at the end of the speed increasing chamber 401, and the speed increasing chamber port cover 403 and the speed increasing chamber 401 form an annular cavity 404, and the speed increasing chamber port cover 403 and the end of the primary mixing tube 402 form a second annular gap 405; the annular cavity 404 is connected to compressed air. Compressed air is input into the annular cavity 404 from the air inlet at the lower end, and then accelerated through the second annular gap 405 to form an accelerated airflow, which accelerates the powder-water preliminary mixed flow with a decayed velocity, and forms an accelerated flushing airflow on the inner tube wall at the inlet end of the mixing chamber 501, thereby preventing the mixed slurry from adhering to the tube wall.

[0051] like Figure 8 As shown, the mixing chamber 501 has a central channel 506, and the central channel 506 is connected to the primary mixing pipe 402; the outer periphery of the central channel 506 has a narrow gap 505 and a mixing chamber cavity 504; the mixing chamber cavity 504 is connected to compressed air. Figure 9-10 As shown, the mixing chamber 501 is embedded with a front cyclone impeller 502 and a terminal cyclone impeller 503; the centers of the front cyclone impeller 502 and the terminal cyclone impeller 503 have a central channel 506. The front cyclone impeller 502 and the terminal cyclone impeller 503 each have a plurality of blades; the blades of the front cyclone impeller 502 and the blades of the terminal cyclone impeller 503 are facing each other and staggered; and after assembly, a narrow gap 505 is formed between adjacent blades.

[0052] The front cyclone impeller 502 and the terminal cyclone impeller 503 are key components for forming a cyclone. The front cyclone impeller 502 and the terminal cyclone impeller 503 have end faces, respectively, and the end faces have multiple blades. Positioning pin holes 507 can be set on the blades, and the front cyclone impeller 502 and the terminal cyclone impeller 503 are assembled by positioning with pins. The diameter of the blade part is smaller than the diameter of the end face. After inlaying, the front cyclone impeller 502 and the terminal cyclone impeller 503 form a mixing chamber cavity 504 with the inner wall of the mixing chamber 501, which serves as an airflow channel for the outside to enter the mixing chamber 501.

[0053] The blade surfaces of the front cyclone impeller 502 and the blade surfaces of the rear cyclone impeller 503 are both inclined at a predetermined angle to the radial and axial directions to weaken the reverse airflow generated in the center of the cyclone. The compressed air passes through the narrow gap 505 formed after assembly to generate a rotating forward airflow, thereby extending the material mixing path within a shorter straight-line distance to achieve full mixing of powder mist and water mist. The weak reverse airflow generated in the center of the cyclone will be offset by the speed-increasing airflow generated by the previous speed-increasing chamber 401.

[0054] After the front cyclone impeller 502 and the rear cyclone impeller 503 are separated, the processing cost is reduced, which is more conducive to adjusting the gap width between the blades, so as to obtain the best forward rotating airflow. By superimposing the number of mixing chambers 501, the spraying effect can be effectively controlled. For concrete materials with high viscosity and short setting time, a few groups of mixing chambers 501 are used, which is conducive to rapid spraying in a short time (2 to 3 seconds); for concrete materials with low viscosity and slightly longer setting time, a few groups of mixing chambers 501 are used, which is conducive to more complete mixing of materials and mixing water.

[0055] like Figure 11-12 As shown, the feeding end of the gathering bin 601 is inlaid with a gathering tube 602, and the discharging end of the gathering bin 601 is tightly matched with the nozzle 603, and the discharging end of the gathering tube 602 is inlaid on the nozzle 603; a gathering bin cavity 604 is formed between the gathering bin 601 and the gathering tube 602; the gathering bin cavity 604 is connected to compressed air. Surrounding small holes 605 are arranged inside the nozzle 603. External compressed air enters the gathering bin cavity 604 from the lower end inlet of the gathering bin 601, and is blown out through the surrounding small holes 605 arranged inside the nozzle 603, forming a direct airflow on the inner wall of the nozzle 603. The mixed slurry in a scattered state sprayed out by the gathering tube 602 is gathered by the direct airflow, forming an effect close to direct spraying.

[0056] The blowpipe 104 is connected to the gas distribution integrated block through a hose; the gas distribution integrated block is connected to the air compressor. The annular cavity 404 is connected to the gas distribution integrated block through a hose; the mixing chamber cavity 504 is connected to the gas distribution integrated block through a hose; the gathering chamber cavity 604 is connected to the gas distribution integrated block through a hose. The compressed air pressures required for powder blowing, speed increase, cyclone, and gathering injection are different, and separate passages are required to control the air volume and air pressure. The present invention is provided with a gas distribution integrated block. After entering the gas distribution integrated block from the main air inlet pipe, the compressed air is divided into multiple branches. The air outlets of each branch are connected to the air inlet of each functional chamber using a standard quick-change connector and a hose. It is compact and simple, easy to quickly disassemble and maintain, and conducive to reducing the overall volume of the injection head. After the compressed air air pipe is summarized and bundled, it is connected to the gas distribution integrated block, which can clearly indicate the direction of the pipeline and facilitate the adjustment of the gas control switch; the main air inlet pipe of the gas distribution integrated block is connected to the air compressor, and the length of the main air inlet pipe is lengthened, so that construction operations over a long distance can be achieved.

[0057] The working principle of the concrete spraying device provided by the present invention for rotating and mixing powder and mixing water to form mist spray is as follows:

[0058] Powder is sucked to form powder mist: a low-pressure area is generated in the center of the high-speed flowing gas, and the gas in the surrounding high-pressure areas will flow to the central low-pressure area to form a negative pressure; the number of negative pressure channels is increased around the central airflow, and the same negative pressure in each channel will accumulate at the powder suction port to form a larger suction force, achieving the effect of using a high-speed small-diameter inlet airflow to form a large-diameter, large-suction force.

[0059] Absorbing water to form water mist: The end of the high-speed powder flow is designed to conform to the structure of the Venturi effect, forming a negative pressure to absorb the mixing water into the nozzle. At the same time, the mixing water is blown away by the powder flow at the outlet of the small gap to form water mist, which is wrapped around the outside of the powder mist, and the water mist and powder mist are initially mixed quickly;

[0060] Mixed mist flow acceleration: The mist mixed flow with attenuated flow velocity may be retained on the side wall. The compressed air rushes out of the small annular gap at the port of the speed increasing chamber 401 at high speed, accelerating the mixed mist flow with attenuated velocity, and enters the rotating mixing chamber 501; while the speed increasing chamber 401 accelerates the mixed mist flow, it also offsets the reverse pressure formed in the center of the cyclone;

[0061] Rotational mixing: The eccentric air outlet of the rotary mixing chamber forms a cyclone, which re-mixes the initially mixed powder mist and water mist; the rotating airflow distorts the straight-line mist flow, generating axial staggered airflow, which lengthens the distance the mixture passes through, facilitating more complete mixing; at the same time, the cyclone surrounding the side wall effectively prevents the slurry from adhering to the side wall;

[0062] After gathering, the slurry is accelerated and ejected: after being constrained by the short pipe, the rotating slurry is accelerated again by the surrounding high-speed airflow at the end of the nozzle 603, and ejected from the nozzle 603. The inner periphery of the nozzle 603 is wrapped by the airflow, the slurry scattering range is reduced, and the spray mist is concentrated.

[0063] The specific working process of the present invention is as follows:

[0064] The blow pipe 104 is connected to the compressed air, the fixed hose of the water suction pipe joint 102 is connected to the water tank through a flow meter, and the powder suction pipe joint 105 is connected to the powder box through a hose. The external air ducts of the speed increasing bin 401, the mixing bin 501, and the gathering bin 601 are respectively connected to the compressed air integrated block, and an air volume regulating switch is installed at the compressed air inlet to adjust the air intake of different bin sections.

[0065] After the compressed air enters the blow pipe 104, the diameter of the blow pipe 104 is reduced, the wind speed is increased, and the high-speed airflow passes through the center of the powder bin 201 and enters the powder flow pipe 202. Negative pressure is formed in the center of the powder bin 201, and the dry powder material is sucked into the powder bin 201 through the powder suction hose. The dry powder is then blown away by the high-speed airflow and enters the powder flow pipe 202 together.

[0066] The space at the connection of the powder flow pipe 202, the water tank 301, and the primary mixing pipe 402 is designed to produce a Venturi effect. The high-speed powder flow rushes into this space, forming a negative pressure in the conical hole 303 of the water tank 301, and the mixing water is pumped into the water tank 301 through the water hole and the water suction pipe that penetrate the powder tank 201. The mixing water rushes out of the first annular gap 304 formed at the connection of the powder flow pipe 202, the water tank 301, and the primary mixing pipe 402, and is then blown away by the high-speed powder flow to form water mist, which is wrapped on the outside of the powder mist flow and enters the primary mixing pipe 402. At this point, the initial mixing of the powder mist and the water mist is completed.

[0067] At the end of the speed increasing chamber 401 , the primary mixing pipe 402 and the speed increasing chamber port cover 403 form a second annular gap 405 , and the external compressed air rushes out of the small annular gap to form an outer high-speed airflow, which accelerates the powder mist and water mist mixed flow with decayed speed and rushes into the mixing chamber 501 .

[0068] After the compressed air from the outside passes through the cyclone forming component of the mixing chamber 501, the rotating turbulent airflow in the mixing chamber 501 will rotate and stir the powder mist and water mist mixed flow, thereby enhancing the mixing effect. Properly adding one or two mixing chambers 501 will improve the mixing effect of the powder mist and water mist. However, adding too many mixing chambers 501 will reduce the speed of the mixed flow and cause it to stick to the side wall.

[0069] The mixed mist slurry rushing out of the mixing chamber 501 is in a rotating scattered state, and is briefly gathered through the gathering tube 602 of the gathering chamber 601, and rushes into the nozzle 603. The nozzle 603 is designed in the form of a Laval nozzle, and the external compressed air is ejected at high speed through the surrounding small holes 605 distributed in the inner ring of the nozzle 603, which gathers and accelerates the mist slurry again, and ejects it outward in a bound state. At the same time, the outer port of the nozzle 603 is larger than the diameter of the gathering port, and the high-speed airflow ejected from the small hole will form a negative pressure at the center of the outer port of the nozzle 603, which has the effect of extracting the mixed mist flow in the gathering tube 602 and ejecting it out of the nozzle 603.

[0070] At this point, the device has completed the entire process of dry powder inhalation, mixing water inhalation, blowing into mist, mixing and stirring, and gathering and spraying, which takes about 1 to 2 seconds. The outside of the mixed mist slurry is always engulfed by the compressed air flow, and it is sprayed at a high speed to avoid adhesion to the side wall and clogging the nozzle. After the ultra-fast setting concrete material is physically mixed with the mixing water, it is sprayed onto the sprayed surface in the early stage of the chemical reaction, and the subsequent chemical reaction process is completed on the sprayed surface.

[0071] The six bin sections of the present invention adopt a modular design, which is convenient for installation and disassembly, and is conducive to rapid cleaning and maintenance. The specific installation and disassembly process is as follows: the first section is bolted to connect the powder bin cover plate 101, the powder bin 201, and the water bin 301, and the fastening end is on the speed-increasing bin 401; the second section is bolted to connect the speed-increasing bin 401, the multi-stage mixing bin 501, and the gathering bin 601, and the fixed end is on the nozzle 603 of the gathering bin 601. During installation, first connect the second section of bolts from the speed-increasing bin 401 to the nozzle 603, and then fix the bin section connected by the first section of bolts on the speed-increasing bin 401; during disassembly, remove the cover plate, powder bin 201, and water bin (01) connected by the first section of bolts, and then disassemble the speed-increasing bin 401, mixing bin 501, and gathering bin 601 connected by the second section of bolts.

[0072] The device is lightweight and can be operated by hand. According to the water-cement ratio of concrete materials, small water tanks and powder tanks can be configured, and the materials can be sprayed continuously for about 30 minutes before refilling. The powder tank, water tank, and gas distribution manifold are tied to the body or vehicle with a strap. The gas distribution manifold is connected to a longer main air intake pipe, so that the operator or intelligent vehicle can operate in certain special environments.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that modifying the technical solutions described in the aforementioned embodiments, or replacing some or all of the technical features therein by equivalents, does not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist, characterized in that: It comprises a powder bin cover plate (101), a powder bin (201), a water bin (301), a speed increasing bin (401), a mixing bin (501) and a gathering bin (601) which are arranged in sequence; The powder bin cover plate (101) is fixedly mounted on the powder bin (201); a water suction pipe joint (102), a powder suction pipe joint (105) and a blow pipe (104) are arranged on the powder bin cover plate (101); the blow pipe (104) is externally connected to compressed air; An annular passage (203) and a plurality of dry powder passages (204) are formed between the powder bin (201) and the powder bin cover plate (101); the blow pipe (104) extends into the powder bin (201), and a powder flow pipe (202) is embedded at the rear end of the blow pipe (104); and the powder flow pipe (202), the blow pipe (104), the annular passage (203) and the dry powder passages (204) are connected; and a powder bin water channel (205) is provided on the powder bin (201); A conical hole (303) is provided through the water bin (301), the large end surface of the conical hole (303) is in contact with the powder bin (201), and the small end surface of the conical hole (303) forms a first annular gap (304) with the end of the powder flow tube (202); the conical hole (303) is connected to the powder bin water channel (205); A primary mixing tube (402) is embedded in the central hole of the speed increasing chamber (401); the primary mixing tube (402) is in communication with the powder flow tube (202); a speed increasing chamber port cover (403) is embedded at the end of the speed increasing chamber (401); the speed increasing chamber port cover (403) and the speed increasing chamber (401) form an annular cavity (404); the speed increasing chamber port cover (403) and the end of the primary mixing tube (402) form a second annular gap (405); the annular cavity (404) is externally connected to compressed air; The mixing chamber (501) has a central channel (506), and the central channel (506) is connected to the primary mixing pipe (402); the outer periphery of the central channel (506) has a narrow and long gap (505) and a mixing chamber cavity (504); the mixing chamber cavity (504) is connected to compressed air; The feeding end of the gathering bin (601) is inlaid with a gathering tube (602), the discharging end of the gathering bin (601) is tightly fitted with a nozzle (603), and the discharging end of the gathering tube (602) is inlaid on the nozzle (603); a gathering bin cavity (604) is formed between the gathering bin (601) and the gathering tube (602); and the gathering bin cavity (604) is externally connected to compressed air.

2. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 1, characterized in that: The powder bin cover plate (101) is provided with a blow pipe (104) via a blow pipe fixing pipe joint (103).

3. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 2, characterized in that: The water suction pipe joint (102) is connected to the water tank via a water pipe; The powder suction pipe joint (105) is connected to the silo via a hose.

4. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 1, characterized in that: The blowpipe (104) is connected to the gas path distribution integrated block via a hose; the gas path distribution integrated block is connected to an air compressor.

5. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 1, characterized in that: The diameter of the powder flow pipe (202) is greater than the diameter of the blow pipe (104).

6. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 1, characterized in that: The outer ring of the tapered hole (303) is provided with a sealing ring (302).

7. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 1, characterized in that: The diameter of the primary mixing tube (402) is greater than the diameter of the powder flow tube (202).

8. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 1, characterized in that: The mixing chamber (501) is inlaid with a front cyclone impeller (502) and a rear cyclone impeller (503); the centers of the front cyclone impeller (502) and the rear cyclone impeller (503) are provided with a central channel (506); the front cyclone impeller (502) and the rear cyclone impeller (503) are provided with a plurality of blades respectively; the blades of the front cyclone impeller (502) and the blades of the rear cyclone impeller (503) are arranged facing each other and staggered; and narrow gaps (505) are formed between adjacent blades; the front cyclone impeller (502) and the rear cyclone impeller (503) and the inner wall of the mixing chamber (501) form a mixing chamber cavity (504).

9. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 1, characterized in that: Surrounding small holes (605) are arranged inside the nozzle (603).

10. The concrete spraying device for spraying powder and mixing water in a rotating manner to form a mist according to claim 4, characterized in that: The annular cavity (404) is connected to the gas path distribution integrated block via a hose; The mixing chamber cavity (504) is connected to the gas path distribution integrated block via a hose; The gathering bin cavity (604) is connected to the gas path distribution integrated block via a hose.

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