Spraying device for composite colloid material spraying and spraying fire prevention and extinguishing method

Abstract

The present invention discloses a spraying device and a spraying fire prevention and extinguishing method for spraying composite colloidal materials. The spraying device includes a storage box, a spraying generator, a water vapor conveying assembly, and an air amplifier assembly. The storage box is provided with a discharge port. The spraying generator defines a generation channel and an atomization chamber. The generation channel has a channel inlet and a channel outlet. The atomization chamber has an atomization inlet and multiple atomization outlets. The water vapor conveying assembly is used to convey a high-pressure water-gas mixed fluid into the atomization chamber through the atomization inlet, and the high-pressure water-gas mixed fluid can be dispersed and sprayed into the generation channel through multiple atomization outlets. The air amplifier assembly is used to drive the composite colloidal material in the storage chamber to be transported into the generation channel. In the generation channel, the composite colloidal material and the high-pressure water-gas mixed fluid mix and react preliminarily to form a slurry in a state between powder and gel, which is then sprayed from the channel outlet to the spraying operation area. The spraying device of the present application can realize the wall spraying of composite colloidal materials on the surface of coal walls.

Description

Technical Field

[0001] The invention relates to the technical field of coal spontaneous combustion prevention and control, in particular to a spraying device for spraying composite colloid materials and a spraying fire prevention and extinguishing method using the spraying device for spraying. Background Art

[0002] Composite colloid (high water retention gel) material is a powdered fire-fighting material. When mixed with water in a certain proportion, it can form a fire-fighting gel with moderate viscosity within seconds. The formed gel has good fluidity and coverage in the initial stage and can diffuse and accumulate in a limited space. The viscosity of the gel gradually increases with time, and then exhibits good adhesion and wall hanging properties. It can form a dense, high-water content gel protective layer on the coal surface (coal wall surface or coal pile surface) and between cracks. It has excellent heat absorption and cooling, oxygen isolation and cooling functions, and has a significant fire prevention and control effect.

[0003] The viscosity of the gel formed by mixing the composite colloidal material and water in different mass ratios is different. The larger the water-to-material mass ratio, the smaller the viscosity of the gel and the worse the wall-hanging property. On the contrary, the smaller the water-to-material mass ratio, the greater the viscosity of the gel and the better the wall-hanging property.

[0004] Understandably, when composite colloid materials are applied to coalface surfaces (e.g., corner surfaces of coal mining faces or the rear wall of coal mining faces), a gel with a low water-to-cement ratio (e.g., a water-to-cement mass ratio range of 0.5-20), high viscosity, and the ability to cling to the wall is required. Existing grouting devices all use screw pumps to deliver the slurry, but screw pumps are unable to pump such high-viscosity gels. Therefore, when composite colloid materials are applied to coalface surfaces, they are often applied manually. This low water-to-cement ratio, high viscosity, and cling-to-the-wall gel is not only inefficient but also carries significant safety risks. For example, when applied to the corners of coal mining faces, construction workers face the risk of the corners collapsing at any moment.

[0005] Therefore, the application of composite colloidal materials on coalface surfaces is significantly limited. Existing technologies primarily utilize drilling and grouting, which eliminates the need for slurry to adhere to the surface. Instead, a screw pump can be used to inject a low-viscosity slurry with a high water-to-material ratio (e.g., a water-to-material mass ratio of 50-125) through a grouting pipeline into a fire prevention area (e.g., a goaf). Summary of the Invention

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a spraying device for spraying a composite colloidal material, which can achieve wall spraying of the composite colloidal material on the surface of a coal wall, not only improving construction efficiency but also avoiding safety risks during the construction process.

[0007] The present application also proposes a spraying fire prevention and extinguishing method.

[0008] According to the embodiment of the first aspect of the present application, a spraying device for spraying composite colloid materials comprises: a storage box, a storage chamber for storing the composite colloid material is defined in the storage box, and the storage box is provided with a discharge port connected to the storage chamber; a spraying generator, a generation channel and an atomization chamber are defined in the spraying generator, the generation channel has a channel inlet and a channel outlet, the atomization chamber has an atomization inlet and multiple atomization outlets, and the atomization chamber and the generation channel are connected through the multiple atomization outlets; a water vapor conveying component, the water vapor conveying component is used to convey high-pressure water and High-pressure gas allows a high-pressure water-gas mixed fluid to pass into the atomizing chamber, and the high-pressure water-gas mixed fluid can be dispersed and sprayed into the generating channel through multiple atomizing outlets; an air amplifier component, the air amplifier component is connected between the discharge port and the channel inlet, and the water-gas conveying component conveys high-pressure gas thereto as an induced driving force to drive the composite colloidal material in the storage chamber to be conveyed into the generating channel, in which the composite colloidal material and the high-pressure water-gas mixed fluid are mixed and preliminarily reacted to form a slurry in a state between powder and gel, and then sprayed from the channel outlet to the spraying operation area.

[0009] In addition, the spraying device for spraying composite colloidal materials according to the embodiment of the present application may also have the following additional technical features:

[0010] According to one embodiment of the present application, the grouting operation area is a corner area of ​​the coal mining working face or an area behind the coal mining working face.

[0011] According to one embodiment of the present application, the air amplifier assembly includes: a feed pipe, the feed pipe including a feed inlet and a feed outlet, the feed inlet is connected to the discharge port, and the feed outlet is connected to the channel inlet; a first air amplifier and a second air amplifier, the first air amplifier is arranged between the discharge port and the feed inlet, the first air amplifier has a first suction port, a first blowout port and a first high-pressure gas inlet, the first suction port is connected to the discharge port, the first blowout port is connected to the feed inlet, the second air amplifier is arranged between the feed outlet and the channel inlet, the second air amplifier has a second suction port, a second blowout port and a second high-pressure gas inlet, the second suction port is connected to the feed outlet, the second blowout port is connected to the channel inlet, and the first high-pressure gas inlet and the second high-pressure gas inlet are both connected to the water vapor conveying assembly.

[0012] According to one embodiment of the present application, the water vapor delivery component includes a gas supply component, which is used to deliver high-pressure gas toward the first high-pressure gas inlet, the second high-pressure gas inlet and the atomization inlet, and the gas supply component includes: a distributor, the distributor including an input port, a first output port, a second output port and a third output port, the input port is suitable for connecting to a high-pressure gas source; a first high-pressure gas delivery pipe, the first high-pressure gas delivery pipe is connected between the first output port and the first high-pressure gas inlet; a second high-pressure gas delivery pipe, the second high-pressure gas delivery pipe is connected between the second output port and the second high-pressure gas inlet; a third high-pressure gas delivery pipe, the third high-pressure gas delivery pipe is connected between the third output port and the atomization inlet.

[0013] According to one embodiment of the present application, the water vapor conveying component also includes a water supply component, which is used to transport high-pressure water toward the atomization inlet. The water supply component includes a pressure reducing valve, a water supply pipe and a pressure gauge. The pressure reducing valve has a water inlet, a water outlet and a pressure gauge interface. The water inlet is suitable for connecting to a high-pressure water source, the water outlet is connected to one end of the water supply pipe, the pressure gauge interface is connected to the pressure gauge, and the other end of the water supply pipe is connected to the atomization inlet.

[0014] According to one embodiment of the present application, the spraying device also includes: a branch water supply control valve, which is arranged between the other end of the water supply pipe and the atomization inlet; a main water supply control valve and a main air supply control valve, which is arranged between the water inlet and the high-pressure water source, and the main air supply control valve is arranged between the input port and the high-pressure air source, and the main water supply control valve and the main air supply control valve constitute a double valve.

[0015] According to one embodiment of the present application, a flow-disturbing structure is provided in the generating channel, and at least a portion of the flow-disturbing structure is located between the atomizing outlet and the channel outlet. In the generating channel, the composite colloid material and the high-pressure water-gas mixed fluid are fully and evenly mixed under the action of the flow-disturbing structure. The flow-disturbing structure includes a plurality of flow-disturbing baffles, which are arranged on the inner wall surface of the generating channel at intervals along the circumferential direction. Each of the flow-disturbing baffles is a curved plate-shaped structure. Each of the flow-disturbing baffles has a first edge and a second edge opposite to each other in the axial direction of the generating channel, and a third edge and a fourth edge opposite to each other in the radial direction of the generating channel. The second edge is located at the first edge. on the side away from the channel inlet, the third edge is located on the side of the fourth edge away from the central axis of the generating channel, the first edge of one spoiler baffle of each two adjacent spoiler baffles and the second edge of the other spoiler baffle are both bent and extended in the direction from the third edge to the fourth edge toward the direction close to the reference reference area, and the second edge of the one spoiler baffle and the first edge of the other spoiler baffle are both bent and extended in the direction from the third edge to the fourth edge toward the direction away from the reference reference area, wherein the reference reference area is the inner peripheral wall of the generating channel located between the two adjacent spoiler baffles.

[0016] According to one embodiment of the present application, the atomization chamber is arranged around the circumference of the generating channel, and the plurality of atomization outlets are provided between the atomization chamber and the generating channel and are distributed at intervals along the circumference of the generating channel.

[0017] According to one embodiment of the present application, the spray generator includes a first spray generating part and a second spray generating part that are detachably connected, the first spray generating part and the second spray generating part are both annular cylindrical, one end of the second spray generating part is inserted into one end of the first spray generating part, a part of the generating channel is formed in the first spray generating part, and another part of the generating channel is formed in the second spray generating part, the channel inlet is formed at the other end of the first spray generating part, and the channel outlet is formed at the other end of the second spray generating part, the atomization chamber is formed between the one end of the first spray generating part and the one end of the second spray generating part, the atomization outlet is provided on the peripheral wall of the second spray generating part and passes through the peripheral wall of the second spray generating part, and the atomization inlet is provided on the peripheral wall of the first spray generating part.

[0018] According to one embodiment of the present application, the first spraying generating member includes a first spraying generating section and a second spraying generating section connected to each other, the inner diameter d1 of the first spraying generating section is smaller than the inner diameter d2 of the second spraying generating section, a first step surface is formed between the inner circumferential wall of the first spraying generating section and the inner circumferential wall of the second spraying generating section, and the channel inlet is formed at one end of the first spraying generating section away from the second spraying generating section; the second spraying generating member includes a third spraying generating section and a fourth spraying generating section connected to each other, the channel outlet is formed at one end of the fourth spraying generating section away from the third spraying generating section, and the outer diameter D1 of the third spraying generating section is smaller than the outer diameter D2 of the fourth spraying generating section. The outer diameter D2 of the segment is formed, a second step surface is formed between the outer peripheral wall of the third spraying generating segment and the outer peripheral wall of the fourth spraying generating segment, and a plurality of the atomization outlets all pass through the second step surface, wherein the third spraying generating segment is gap-fitted in the second spraying generating segment, one end of the third spraying generating segment away from the fourth spraying generating segment is supported on the first step surface, at least a part of the fourth spraying generating segment is sealed and fitted in the second spraying generating segment, the outer peripheral wall of the third spraying generating segment, the inner peripheral wall of the second spraying generating segment, the first step surface and the second step surface define the atomization cavity, and the atomization inlet is arranged on the peripheral wall of the second spraying generating segment.

[0019] According to one embodiment of the present application, the angle α between the center line of the atomization outlet and the central axis of the generating channel is in the range of 30° to 60°.

[0020] According to the spraying device for spraying composite colloidal materials in an embodiment of the present application, water required for slurrying is dispersedly sprayed into the generating channel through multiple atomization outlets in the form of a high-pressure water-gas mixed fluid (high-pressure air-water mist). In the generating channel, the water is uniformly mixed with the composite colloidal material delivered to the generating channel by the air amplifier assembly and initially reacts to form a slurry in a state between powder and gel. The viscosity of the slurry in this state is lower than that of the gel, and thus it can be smoothly sprayed out from the channel outlet to the spraying operation area under the drive of the high-pressure gas and high-pressure water. During the process of spraying the slurry between powder and gel from the channel outlet to reaching the spraying operation area, the composite colloidal material and water will further react. When the slurry reaches the spraying operation area, the composite colloidal material and water can react to form a gel that can adhere to the wall, so that the slurry can adhere to the surface of the spraying operation area when it reaches the spraying operation area, thereby achieving wall-adhering spraying of the composite colloidal material. For a certain period of time after the slurry is sprayed onto the surface of the spraying operation area, the composite colloidal material and water will continue to react, further increasing the viscosity of the slurry and making the wall adhere more firmly.

[0021] In addition, when the spraying device of the embodiment of the present application is used for spraying operations, the water and composite colloidal materials required for slurrying can be immediately and quantitatively introduced into the generating channel, uniformly mixed in the generating channel, and sprayed out after preliminary reaction. That is, it is possible to achieve immediate small-scale feeding, immediate reaction, and immediate spraying, thereby avoiding uneven mixing of water and material due to excessive material quantity and excessive slurry viscosity that cannot be sprayed out due to long reaction time. And when the spraying device of the embodiment of the present application is used for underground coal mine spraying, the pressurized water in the underground coal mine water supply network and the compressed air in the compressed air network can be used as high-pressure water source and high-pressure gas source respectively. The use of high-pressure water and high-pressure gas can achieve the requirements of material transportation, slurrying, and spraying. No electricity is required during the construction process, thereby improving the safety of mine construction.

[0022] According to the second embodiment of the present application, the spraying fire prevention and extinguishing method uses the spraying device according to the first embodiment of the present application to perform spraying fire prevention and extinguishing. The spraying fire prevention and extinguishing method includes:

[0023] Controlling the water-gas delivery component to deliver the high-pressure water at a constant flow rate toward the atomizing inlet, and to deliver the high-pressure gas at a constant flow rate toward the atomizing inlet, so that the water required for pulping is delivered to the generating channel in the form of the high-pressure water-gas mixed fluid at a constant flow rate;

[0024] The water vapor conveying component is controlled to convey the high-pressure gas toward the air amplifier component, so that the composite colloidal material in the storage chamber is conveyed to the generating channel at a constant flow rate under the drive of the air amplifier component. In the generating channel, the composite colloidal material and the water required for pulping are mixed according to a set mass ratio and preliminarily reacted to form a slurry in a state between powder and gel, and then sprayed from the channel outlet to the spraying operation area.

[0025] According to one embodiment of the present application, when the spraying device used in the spraying fire prevention and extinguishing method includes the branch water supply control valve, the main water supply control valve and the main air supply control valve, the spraying fire prevention and extinguishing method further includes:

[0026] After the spraying is completed, the branch water supply control valve is closed first, and after an interval of 0.5s to 1s, the main water supply control valve and the main air supply control valve are closed.

[0027] According to the spraying fire prevention and extinguishing method of the embodiment of the present application, by adopting the spraying device according to the above-mentioned first aspect embodiment of the present application, the spraying fire prevention and extinguishing method has all the advantages of the spraying device according to the above-mentioned first aspect embodiment, which will not be repeated here.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 is a perspective view of a spraying device according to an embodiment of the present application;

[0031] Figure 2 yes Figure 1 A perspective view of the spraying device from another angle shown in FIG.

[0032] Figure 3 yes Figure 1 A schematic diagram of a portion of the structure of the spraying device shown in FIG;

[0033] Figure 4 yes Figure 1 A perspective view of a shotcrete generator as shown in FIG;

[0034] Figure 5 yes Figure 4 A perspective view of the spraying generator from another angle shown in FIG.

[0035] Figure 6 yes Figure 4 A front view of the shotcrete generator shown in FIG;

[0036] Figure 7 yes Figure 6 A cross-sectional view of the spray generator along line AA shown in FIG;

[0037] Figure 8 yes Figure 4 Exploded view of the shotcrete generator shown in ;

[0038] Figure 9 yes Figure 8 A perspective view of the second spraying generating member shown in ;

[0039] Figure 10 yes Figure 8 A perspective view of the first spraying generating member shown in ;

[0040] Figure 11 is a perspective view of a second spraying generating member according to another embodiment of the present application;

[0041] Figure 12 is a front view of a spraying generator according to another embodiment of the present application;

[0042] Figure 13 yes Figure 12 A cross-sectional view of the spray generator along line BB shown in FIG;

[0043] Figure 14 yes Figure 1 A schematic diagram of a portion of the structure of the spraying device shown in FIG;

[0044] Figure 15 yes Figure 14 A schematic diagram of a portion of the structure shown in ;

[0045] Figure 16 yes Figure 15 A schematic diagram of a portion of the structure shown in ;

[0046] Figure 17 This is a before-and-after comparison diagram of spraying a smooth brick wall surface using the spraying device of the present application;

[0047] Figure 18 This is a comparison diagram before and after spraying a rough wall surface using the spraying device of the present application.

[0048] Reference numerals:

[0049] Shotcrete device 100; storage box 10; storage chamber 11; discharge port 111; feeding port 112; shotcrete generator 20; generating channel 201; channel inlet 2011; channel outlet 2012; atomizing chamber 202; atomizing inlet 2021; atomizing outlet 2022; first shotcrete generating element 21; first shotcrete generating section 211; second shotcrete generating section 212; first step surface 213; annular rib 2131; positioning groove 21311; second shotcrete generating element 22; third shotcrete generating section 221; fourth shotcrete generating section 222; inserting shotcrete generating section 2221; extending shotcrete generating section 2222; third step surface 2223; second step surface 223; spoiler 23; first edge 231; second edge 232; third edge 233; fourth edge 234; datum reference area 230; first sealing ring 24; second sealing ring 25; hanging ring 26; contraction section 27; feed pipe 31; first air amplifier 32; first high-pressure gas inlet 321; second air amplifier 33; second high-pressure gas inlet 331; pressure reducing valve 41; water inlet 411; water outlet 412; pressure gauge interface 413; water supply pipe 42; pressure gauge 43; distributor 51; first high-pressure gas delivery pipe 52; second high-pressure gas delivery pipe 53; third high-pressure gas delivery pipe 54; tee 60; triangular bracket 71; universal joint 72; carrier body 80; wheel 81; branch water supply control valve 91; branch air supply control valve 92; main water supply control valve 93; main air supply control valve 94; individual water supply control valve 95; individual air supply control valve 96. DETAILED DESCRIPTION

[0050] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0051] Reference below Figures 1-18 The following describes a spraying device 100 for spraying composite colloid materials according to an embodiment of the first aspect of the present application. The spraying device 100 includes: a material storage box 10, a spraying generator 20, an air amplifier assembly, and a water and air conveying assembly.

[0052] See also Figure 1-Figure 2 as well as Figure 14-15 The storage box 10 defines a storage chamber 11 suitable for storing a composite colloidal material. The storage box 10 is provided with a feeding port 112 and a discharging port 111 in communication with the storage chamber 11. The composite colloidal material (high water-retention gel) is a powdery material. The composite colloidal material can be added to the storage chamber 11 through the feeding port 112, and the composite colloidal material in the storage chamber 11 can be discharged through the discharging port 111. The feeding port 112 can be located at the top of the storage box 10, and the discharging port 111 can be located at the bottom of the storage box 10. Optionally, a lid (not shown) for sealing the feeding port 112 can be provided at the top of the storage box 10. When adding material, the lid is opened; after adding material, the lid is closed to reduce dust generation. The lid is breathable to prevent a negative pressure state from occurring in the storage chamber 11 and affecting material discharge.

[0053] Please continue reading Figure 1-Figure 2 as well as Figure 14-15 The spraying device 100 may further include a carrier body 80 , the carrier body 80 is provided with wheels 81 , and the storage box 10 is supported and fixed on the carrier body 80 , which facilitates the movement of the storage box 10 .

[0054] See also Figure 4-Figure 7 as well as Figure 11 The spraying generator 20 defines a generating channel 201 and an atomizing chamber 202. The generating channel 201 has a channel inlet 2011 and a channel outlet 2012. The atomizing chamber 202 has an atomizing inlet 2021 and a plurality of atomizing outlets 2022 spaced apart from each other. The atomizing chamber 202 and the generating channel 201 are connected through the atomizing outlet 2022, and the channel inlet 2011 is connected to the discharge port 111.

[0055] The water-gas delivery assembly is used to deliver high-pressure water and high-pressure gas into the atomizing chamber 202 through the atomizing inlet 2021, so that a high-pressure water-gas mixed fluid is introduced into the atomizing chamber 202, and the high-pressure water-gas mixed fluid can be dispersed and sprayed into the generating channel 201 through the multiple atomizing outlets 2022. In other words, the water-gas delivery assembly is suitable for connecting the atomizing inlet 2021 and the high-pressure gas source, and connecting the atomizing inlet 2021 and the high-pressure water source. The high-pressure gas source delivers high-pressure gas toward the atomizing inlet 2021 through the water-gas delivery assembly, and the high-pressure water source delivers high-pressure water toward the atomizing inlet 2021 through the water-gas delivery assembly.

[0056] The air amplifier assembly is connected between the discharge port 111 and the channel inlet 2011, that is, the channel inlet 2011 and the discharge port 111 are connected through the air amplifier assembly. The air amplifier assembly is supplied with high-pressure gas by the water vapor delivery assembly as an ejection driving force to drive the composite colloidal material in the storage chamber 11 into the generating channel 201. In other words, the water vapor delivery assembly is also suitable for connecting a high-pressure gas source to the air amplifier assembly, and the high-pressure gas source provides high-pressure gas to the air amplifier assembly through the water vapor delivery assembly as an ejection driving force.

[0057] Optionally, the water vapor delivery assembly may include a water supply assembly and an air supply assembly, wherein the water supply assembly is suitable for connecting the atomization inlet 2021 and the high-pressure water source. The air supply assembly is suitable for connecting the atomization inlet 2021 and the high-pressure air source, as well as connecting the air amplifier assembly and the high-pressure air source. In other words, the atomization inlet 2021 and the high-pressure air source are connected via the air supply assembly, and the air amplifier assembly and the high-pressure air source are also connected via the air supply assembly. The high-pressure air source provides high-pressure gas to the air amplifier assembly through the air supply assembly, providing ejection power for the air amplifier assembly, and utilizing the ejection effect of the high-speed airflow to form a driving force that drives the composite colloidal material to flow from the discharge port 111 toward the channel inlet 2011.

[0058] In the generating channel 201 , the composite colloidal material and the high-pressure water-gas mixed fluid are mixed and reacted preliminarily to form a slurry in a state between powder and gel, which is then sprayed from the channel outlet 2012 toward the spraying operation area.

[0059] Specifically, when the spraying device 100 is working, it controls the water-gas conveying component to convey high-pressure water at a constant flow rate toward the atomizing inlet 2021 as water for pulping, and conveys high-pressure gas toward the atomizing inlet 2021, so that a high-pressure water-gas mixed fluid (high-pressure gas-water mist) is introduced into the atomizing chamber 202, and the water required for pulping is conveyed at a constant flow rate to the generating channel 201 in the form of a high-pressure water-gas mixed fluid through multiple atomizing outlets 2022.

[0060] By controlling the water vapor conveying component to deliver high-pressure gas toward the air amplifier component, the composite colloidal material in the storage chamber 11 is delivered to the generating channel 201 at a constant flow rate under the drive of the air amplifier component. In the generating channel, the composite colloidal material and the water required for pulping are mixed according to the set mass ratio and react preliminarily to form a slurry in a state between powder and gel, and then sprayed from the channel outlet 2012 to the spraying operation area.

[0061] When using the spraying device 100 of the embodiment of the present application for spraying, the water required for slurry production is present in the form of a high-pressure water-air mixture (high-pressure air-water mist) within the atomization chamber 202. This water is then dispersed through multiple atomization outlets 2022 and sprayed into the generation channel 201. The composite colloidal material stored in the storage tank 10 is transported into the generation channel 201 by the high-pressure airflow, where it mixes and initially reacts with the dispersed water-air mixture (high-pressure air-water mist) sprayed into the generation channel 201 through the atomization outlets 2022. Clearly, the water and material are evenly mixed within the generation channel 201.

[0062] It should be noted that the high-pressure gas provided by the high-pressure gas source to the air amplifier assembly as the ejection force will mix with the composite colloidal material and enter the generating channel 201. In other words, the composite colloidal material is mixed in the high-pressure airflow and driven by the high-pressure airflow into the generating channel 201. The water required for slurrying enters the generating channel 201 in the form of a high-pressure water-air mixture (high-pressure air-water mist). Within the generating channel 201, the composite colloidal material and water mix and initially react to form a slurry between powdery and gel-like states. This slurry is then sprayed through the channel outlet 2012 toward the spraying operation area under the drive of water and air pressure.

[0063] Optionally, the pressure of the high-pressure water flow delivered by the high-pressure water source toward the atomizing inlet 2021 is not less than 0.3 MPa, and the pressure of the high-pressure air flow delivered by the high-pressure air source toward the atomizing inlet 2021 and the air amplifier assembly is not less than 0.5 MPa. This can better ensure the power requirements for material transportation and spraying.

[0064] In the spraying device 100 of the embodiment of the present application, the driving forces for conveying the pulping raw materials (i.e., the composite colloidal material is conveyed from the storage tank 10 into the generating channel 201) and spraying (i.e., the water and material are mixed and initially reacted within the generating channel 201 before being sprayed into the spraying operation area) are the air pressure of the high-pressure air source and the water pressure of the high-pressure water source. When the spraying device 100 of the embodiment of the present application is used underground in a coal mine, the high-pressure water source can be high-pressure water within the underground coal mine water supply network. The atomizing inlet 221 is connected to the underground coal mine water supply network via a water-gas conveying assembly, thereby conveying the high-pressure water within the underground coal mine water supply network to the atomizing inlet 221. The high-pressure air source can be compressed air within the underground coal mine air pressure network. The atomizing inlet 221 and the air amplifier assembly can be connected to the underground coal mine air pressure network via the water-gas conveying assembly, thereby conveying the compressed air within the underground coal mine air pressure network to the atomizing inlet 221 and the air amplifier assembly, respectively. Therefore, when the spraying device 100 of the embodiment of the present application is used underground in a coal mine, the pressurized water and compressed air in the underground water supply network and compressed air network of the coal mine can provide material transportation and spraying power for the spraying device 100 without the need for electric drive, thereby improving the installability and reliability of mine construction.

[0065] It should also be noted that the composite colloidal material and water can form a gel after sufficient reaction. The composite colloidal material and water only undergo a preliminary reaction in the generating channel 201 of the spraying device 100 to form a slurry in a state between powder and gel. The viscosity of the slurry in this state is lower than that of the gel, so it can be smoothly sprayed out from the channel outlet 2012 to the spraying operation area under the pressure of compressed air and pressurized water; in the process of this slurry between powder and gel being sprayed out from the channel outlet 2012 to reaching the spraying operation area, the composite colloidal material and water will further react. When it reaches the spraying operation area, the composite colloidal material and water can react to form a gel that can hang on the wall, so that the slurry can hang on the surface of the spraying operation area when it reaches the spraying operation area, thereby realizing the wall-hanging spraying of the composite colloidal material; within a certain period of time after the slurry is sprayed to the surface of the spraying operation area, the composite colloidal material and water will continue to react, the viscosity of the slurry will further increase, and the wall hanging will be more firm.

[0066] That is to say, when the spraying device 100 of the embodiment of the present application is used for spraying operations, the reaction between the composite colloidal material and water is divided into three stages. The first stage is during the mixing process with water in the generating channel 201. At this time, the composite colloidal material and water only undergo a preliminary reaction to form a low-viscosity slurry between powder and gel, which can be sprayed under the action of pressurized water and compressed air; the second stage is when it is sprayed out from the channel outlet 2012 of the generating channel 201 and before reaching the spraying operation area, at this time the composite colloidal material further reacts with water to form a medium-viscosity gel-like slurry that can hang on the wall; the third stage is within a certain period of time after being sprayed to the surface of the spraying operation area, at this time the composite colloidal material further reacts with water to form a high-viscosity slurry that hangs on the wall more firmly.

[0067] The following table shows experimental data of using the spraying device 100 of the embodiment of the present application for spraying on a smooth brick wall surface and a rough wall surface. The composite colloid material used is a composite colloid material produced by Xuzhou Ji'an Mining Technology Co., Ltd.

[0068]

[0069] From the above table and reference Figure 17-18 , Figure 17 This is a comparison diagram before and after spraying a smooth brick wall surface using the spraying device 100 of an embodiment of the present application. Figure 18 The following is a comparison diagram before and after spraying a rough wall surface using the spraying device 100 of an embodiment of the present application. The water consumption in the above table is the flow rate Q1 of the water required for slurrying delivered by the water vapor conveying component toward the atomizing inlet 2021, and the suction amount in the above table is the flow rate Q2 of the composite colloid material delivered by the air amplifier component toward the generating channel 201. When the composite colloid material is used for spraying smooth wall tiles, the ratio Q1 / Q2 between the flow rate Q1 of the water required for slurrying delivered by the water vapor conveying component toward the atomizing inlet 2021 and the flow rate Q2 of the composite colloid material delivered by the air amplifier component toward the generating channel 201 is 0.54; when the composite colloid material is used for spraying rough wall surfaces, the ratio Q1 / Q2 between the flow rate Q1 of the water required for slurrying delivered by the water vapor conveying component toward the atomizing inlet 2021 and the flow rate Q2 of the composite colloid material delivered by the air amplifier component toward the generating channel 201 is 4.32.

[0070] It can be understood that the ratio (Q1 / Q2) between the flow rate Q1 of the water required for slurrying delivered by the water-vapor conveying assembly toward the atomizing inlet 2021 and the flow rate Q2 of the composite colloidal material delivered by the air amplifier assembly toward the generating channel 201 represents the water-to-material mixing mass ratio within the generating channel. By adjusting the flow rate Q1 of the water required for slurrying delivered by the water-vapor conveying assembly toward the atomizing inlet 2021 and the flow rate Q2 of the composite colloidal material delivered by the air amplifier assembly toward the generating channel 201, different water-to-material mixing mass ratios can be achieved, thereby meeting the requirements for spraying on surfaces of varying roughness.

[0071] In summary, according to the spraying device 100 of the embodiment of the present application, the water required for pulping is dispersedly sprayed into the generating channel 201 through multiple atomization outlets 2022 in the form of a high-pressure water-gas mixed fluid (high-pressure air-water mist), and is uniformly mixed with the composite colloidal material transported to the generating channel 201 by the air amplifier component in the generating channel 201 and preliminarily reacted to form a slurry between powder and gel. The viscosity of the slurry in this state is lower than that of the gel, so it can be smoothly sprayed out from the channel outlet 2012 to the spraying operation area under the pressure of compressed air and pressurized water; this In the process of the slurry between powder and gel being sprayed out from the channel outlet 2012 and reaching the spraying operation area, the composite colloidal material and water will further react. When it reaches the spraying operation area, the composite colloidal material and water can react to form a gel that can hang on the wall, so that the slurry can hang on the surface of the spraying operation area when it reaches the spraying operation area, thereby realizing the wall-hanging spraying of the composite colloidal material; within a certain period of time after the slurry is sprayed to the surface of the spraying operation area, the composite colloidal material and water will continue to react, the viscosity of the slurry will further increase, and the wall hanging will be more firmly.

[0072] In addition, when the spraying device 100 of the embodiment of the present application is used for spraying operations, the water and composite colloidal material required for slurrying can be immediately and quantitatively introduced into the generating channel 201, uniformly mixed in the generating channel 201, and sprayed out after preliminary reaction. That is, it is possible to achieve immediate small-scale feeding, immediate reaction, and immediate spraying, thereby avoiding uneven mixing of water and material due to excessive material quantity and excessive slurry viscosity that cannot be sprayed due to excessive reaction time. Moreover, when the spraying device 100 of the embodiment of the present application is used for spraying underground in a coal mine, the pressurized water in the underground water supply network of the coal mine and the compressed air in the compressed air network can be used as the driving force to achieve material transportation and spraying. No electricity is required during the construction process, thereby improving the safety of mine construction.

[0073] It should be noted that, in the present application, the grouting device 100 is used for underground grouting in a coal mine, and the high-pressure water source and the high-pressure gas source are respectively the pressure water in the underground water supply network of the coal mine and the compressed air in the compressed air network, but the present application is not limited to this. When the grouting device 100 of the embodiment of the present application is used for grouting fire prevention and extinguishing of coal piles in a coal yard, the high-pressure water source and the high-pressure gas source will be selected according to the on-site construction conditions.

[0074] In some embodiments of the present application, the grouting operation area is a corner area of ​​a coal mining working face. That is, the grouting device 100 for composite colloidal material grouting in the embodiment of the present application can be used for grouting the wall surface of the corner area of ​​a coal mining working face.

[0075] Corner management has always been a difficult point in the safety management of comprehensive mining working faces. In the existing technology, corner management mainly adopts leak-proof measures such as hanging wind curtains and constructing windbreak walls. However, the corners are always in dynamic change with the mining of the working face. The support is pulled once every time a piece of coal is cut on the working face. The wind curtains will be damaged by external forces and lose their function. Special personnel need to be arranged for maintenance during each shift. In addition, the construction of wind curtains is limited by the space and shape of the corners, and there is a problem of loose connection with the top. It is easy to deform when it is pressed by the force from the roof, and then new air leakage cracks are generated, resulting in the problem of excessive gas in the corners. By adopting the spraying fire prevention method of the present application, a gel-like slurry is sprayed on the wall surface of the corner area of ​​the coal mining working face, thereby forming a dense gel protective layer on the wall surface of the corner area of ​​the coal mining working face, which has excellent oxygen isolation function, thereby achieving the purpose of leak-proofing and fire prevention in the corners of the coal mining working face. The construction is convenient, and the spraying fire prevention and extinguishing method of the present application can achieve a long spraying distance, and the spraying operation of the corner area can be carried out in a safe area outside the corner area, thereby improving the safety of the construction process.

[0076] In some embodiments of the present application, the grouting operation area is the area behind the coal mining face. That is, the grouting device 100 for composite colloid material grouting in the embodiments of the present application can be used for grouting the wall surface behind the coal mining face. Of course, the present application is not limited to this, and the grouting operation area can also be other exposed coal bodies, such as coal piles.

[0077] In some embodiments of this application, please refer to Figure 1-Figure 2 The air amplifier assembly includes a feed pipe 31, a first air amplifier 32, and a second air amplifier 33. The feed pipe 31 includes a feed inlet and a feed outlet. The feed inlet is connected to the discharge port 111, and the feed outlet is connected to the channel inlet 2011. In other words, the discharge port 111 and the channel inlet 2011 of the storage box 10 are connected via the feed pipe 31.

[0078] The first air amplifier 32 is located between the discharge port 111 and the feed inlet. It has a first suction port, a first blowout port, and a first high-pressure gas inlet 321. The first suction port is connected to the discharge port 111, and the first blowout port is connected to the feed inlet. The second air amplifier 33 is located between the feed outlet and the channel inlet 2011. It has a second suction port, a second blowout port, and a second high-pressure gas inlet 331. The second suction port is connected to the feed outlet, and the second blowout port is connected to the channel inlet 2011. Both the first and second high-pressure gas inlets 321 and 331 are connected to a water-gas conveying assembly. For example, the first and second high-pressure gas inlets 321 and 331 can be connected to the coal mine's underground pressure air duct network via the water-gas conveying assembly. This allows compressed air within the coal mine's underground pressure air duct network to enter the first and second air amplifiers 32 and 33 through the first and second high-pressure gas inlets 321 and 331, respectively, providing ejection power for the first and second air amplifiers 32 and 33.

[0079] Driven by the first air amplifier 32, the composite colloid material in the storage box 10 is discharged from the discharge port 111, then drawn into the first air amplifier 32 through the first suction port. It is then blown into the feed pipe 31 through the first blow port. Driven by the second air amplifier 33, the composite colloid material blown into the feed pipe 31 is drawn into the second air amplifier 33 through the second suction port, and then blown into the generating channel 201 through the second blow port. The air amplifier assembly achieves the extraction and delivery of the composite colloid material through the suction relay of the first and second air amplifiers 32, 33. The air amplifier assembly has a simple structure and strong driving force.

[0080] Of course, the present application is not limited to this. At least one air amplifier can be connected in series between the first air amplifier 32 and the second air amplifier 33. In this way, the overall suction force of the air amplifier assembly is greater, the suction distance is longer, and the suction process is smoother.

[0081] Furthermore, the water vapor delivery assembly includes a gas supply assembly for delivering high-pressure gas toward the first high-pressure gas inlet 321, the second high-pressure gas inlet 331 and the atomizing inlet 2021. Figure 1-Figure 2 as well as Figure 14-16The gas supply assembly includes a distributor 51, a first high-pressure gas delivery pipe 52, a second high-pressure gas delivery pipe 53 and a third high-pressure gas delivery pipe 54. The distributor 51 includes an input port, a first output port, a second output port and a third output port, and the input port is suitable for connecting to a high-pressure gas source. The first high-pressure gas delivery pipe 52 is connected between the first output port and the first high-pressure gas inlet 321, the second high-pressure gas delivery pipe 53 is connected between the second output port and the second high-pressure gas inlet 331, and the third high-pressure gas delivery pipe 54 is connected between the third output port and the atomization inlet 2021. Thus, the first high-pressure gas inlet 321 and the high-pressure gas source can be connected through the first high-pressure gas delivery pipe 52, the second high-pressure gas inlet 331 and the high-pressure gas source can be connected through the second high-pressure gas delivery pipe 53, and the high-pressure gas source and the atomization inlet 2021 can be connected through the third high-pressure gas delivery pipe 54. By making the above-mentioned gas supply assembly include a one-inlet and three-outlet distributor 51, the connection between the high-pressure gas source and the first high-pressure gas inlet 321, the second high-pressure gas inlet 331 and the atomization inlet 2021 can be achieved, thereby making the overall structure of the spraying device 100 simple and convenient for connection and maintenance.

[0082] Of course, the connection between the high-pressure gas source of the present application and the first high-pressure gas inlet 321, the second high-pressure gas inlet 331 and the atomizing inlet 2021 may not be limited to the above-mentioned connection method, and can be arbitrarily selected according to actual needs. For example, in some other embodiments, the gas supply assembly may include two one-inlet and two-outlet distributors, wherein the inlet of one distributor is connected to the high-pressure gas source, and the two outlets are respectively connected to the atomizing inlet 2021 and the inlet of the other distributor, and the two outlets of the other distributor are respectively connected to the first high-pressure gas inlet 321 and the second high-pressure gas inlet 331.

[0083] Furthermore, the water vapor delivery assembly further includes a water supply assembly for delivering high-pressure water toward the atomization inlet 2021. Figure 1-Figure 2 as well as Figure 15-16The water supply assembly includes a pressure reducing valve 41, a water supply pipe 42, and a pressure gauge 43. The pressure reducing valve 41 has a water inlet 411, a water outlet 412, and a pressure gauge interface 413. The water inlet 411 is suitable for connecting to a high-pressure water source, the water outlet 412 is connected to one end of the water supply pipe 42, and the pressure gauge interface 413 is connected to the pressure gauge 43. The other end of the water supply pipe 42 is connected to the atomization inlet 2021. The high-pressure water source and the atomization inlet 2021 are connected through the water supply pipe 42. The pressure reducing valve 41 is used to regulate the water pressure in the water supply pipe 42. On the one hand, it can prevent excessive water pressure from damaging the pipeline. On the other hand, it can adjust the water flow in the water supply pipe 42 as needed, thereby adjusting the mass ratio of the water and composite colloidal material mixed in the generation channel 201. Optionally, the water supply assembly may further include a filtering device (not shown), which is arranged before the high-pressure water source and the water inlet 411, so that the high-pressure water source enters the atomization chamber 202 through the pressure reducing valve and the water supply pipe 42 after being filtered, thereby preventing impurities in the high-pressure water source from damaging the pressure reducing valve 41 or clogging the atomization inlet 2021 and the atomization outlet 2022.

[0084] In some other embodiments, the water supply assembly may not include the above-mentioned pressure reducing valve.

[0085] In some other embodiments, the water supply assembly may not include the above-mentioned pressure gauge.

[0086] Please continue reading Figure 1-Figure 2 as well as Figure 15-16 The spraying device 100 may also include: a branch water supply control valve 91, a main water supply control valve 93, and a main air supply control valve 94. The branch water supply control valve 91 is located between the other end of the water supply pipe 42 and the atomizing inlet 2021, the main water supply control valve 93 is located between the water inlet 411 and the high-pressure water source, and the main air supply control valve 94 is located between the input port and the high-pressure air source. The main water supply control valve 93 and the main air supply control valve 94 constitute a double valve. In other words, the main water supply control valve 93 is used to control the connection between the water inlet 411 and the high-pressure water source, and the main air supply control valve 94 is used to control the connection between the input port and the high-pressure air source. The main water supply control valve 93 and the main air supply control valve 94 constitute a double valve, so that the main water supply control valve 93 and the main air supply control valve 94 can be opened or closed synchronously during the spraying operation, which is convenient and accurate to operate. The branch water supply control valve 91 is used to control the connection between the water supply pipe 42 and the atomizing inlet 2021.

[0087] Based on this, after the spraying is completed, the branch water supply control valve 91 can be closed first, and after an interval of 0.5s to 1s, the main water supply control valve 93 and the main air supply control valve 94 that constitute the double valve can be closed. When the branch water supply control valve 91 is closed, water can no longer enter the atomization chamber 202 through the atomization inlet 2021, and the water supply to the spraying generator 20 is stopped. When the main water supply control valve 93 and the main air supply control valve 94 that constitute the double valve are closed, air can no longer enter the spraying generator 20, and the air supply to the spraying generator 20 is also stopped.

[0088] That is, after the spraying is completed, the water supply and air supply to the spray generator 20 are not stopped simultaneously. The water supply is stopped for 0.5 to 1 second (e.g., 0.5, 0.6, 0.7, 0.8, or 1.0 second), followed by the air supply. This allows the water remaining in the atomization chamber 202 and the generation channel 201 of the spray generator 20 to be completely discharged through the channel outlet 2012 under pneumatic drive when the branch water supply control valve 91 is closed (water supply is stopped). This prevents the water remaining in the spray generator 20 from flowing back into the feed pipe 31 through the channel inlet 2011. Consequently, during the next round of spraying, the composite colloid material reacts with water in the feed pipe 31 to form a gel, thereby clogging the feed pipe 31.

[0089] Of course, the present application is not limited to this. In some other embodiments, the main water supply control valve 93 and the main air supply control valve 94 may not constitute a double valve. The main water supply control valve 93 and the main air supply control valve 94 may be controlled separately, thereby eliminating the above-mentioned branch water supply control valve 91. Based on this, after the spraying is completed, the main water supply control valve 93 is closed first, and after an interval of 0.5s to 1s, the main air supply control valve 94 is closed.

[0090] It should be noted that, in some embodiments, the atomizing inlet 2021 may include only one, in which case the water supply component, the air supply component and the atomizing inlet 2021 may be connected via a three-way pipe 60, thereby achieving communication between the water supply component and the atomizing inlet 2021, and between the air supply component and the atomizing inlet 2021. Specifically, Figure 1-Figure 3 As shown in FIG, the water supply pipe 42, the third high-pressure gas delivery pipe 54, and the atomizing inlet 2021 can be connected via a tee pipe 60, thereby achieving communication between the water supply pipe 42 and the atomizing inlet 2021, and between the third high-pressure gas delivery pipe 54 and the atomizing inlet 2021, thereby achieving simple and convenient connection. Based on this, the water and high-pressure gas required for pulping are mixed to form gas-water mist before entering the atomizing chamber 202 (in the tee pipe 60).

[0091] In other embodiments, the atomization inlet 2021 may include multiple, for example, the atomization inlet 2021 may include two, one of the atomization inlets 2021 is connected to the water supply component to transport the water required for pulping into the atomization chamber 202, and the other atomization inlet 2021 is connected to the gas supply component to transport high-pressure gas into the atomization chamber 202. The water required for pulping and the high-pressure gas form gas-water mist only after entering the atomization chamber 202.

[0092] Optionally, see Figure 15-16 The spraying device 100 further includes a branch air supply control valve 92, which is disposed between the first output port and the first high-pressure gas inlet 321. By controlling the opening of the branch air supply control valve 92, the pressure of the high-pressure gas entering the first air amplifier 32 through the first high-pressure gas inlet 321 can be controlled, thereby controlling the suction force of the first air amplifier 32 and, in turn, the flow rate of the composite colloid material transported in the feed pipe 31. This allows for flexible adjustment of the water-material mixture mass ratio in the generating channel 201 and the slurry output during the spraying operation.

[0093] Optionally, see Figure 15-16 The spraying device 100 also includes a separate water supply control valve 95 and a separate air supply control valve 96. The separate water supply control valve 95 is located between the high-pressure water source and the main water supply control valve 93, and the separate air supply control valve 96 is located between the high-pressure air source and the main air supply control valve 94. It is understandable that separate water supply or separate air supply is usually required during equipment maintenance or water and air supply testing. By providing the separate water supply control valve 95 and the separate air supply control valve 96, separate water supply and separate air supply can be achieved for the spraying device 100. Specifically, when separate water supply is required, the main water supply control valve 93 and the main air supply control valve 94 forming the double valve are controlled to be in the open state, the separate water supply control valve 95 is opened, and the separate air supply control valve 96 is closed. However, when separate air supply is required, the main water supply control valve 93 and the main air supply control valve 94 forming the double valve are controlled to be in the open state, the separate air supply control valve 96 is opened, and the separate water supply control valve 95 is closed.

[0094] In some embodiments of the present application, a flow disturbance structure is provided in the generating channel 201, and at least a portion of the flow disturbance structure is located between the atomizing outlet 2022 and the channel outlet 2012. In some embodiments, see Figure 7 , a portion of the flow-disturbing structure is located between the atomizing outlet 2022 and the channel outlet 2012, and a portion is located between the atomizing outlet 2022 and the channel inlet 2011; in some embodiments, see Figure 11The entire flow-turbulating structure is located between the atomizing outlet 2022 and the channel outlet 2012. By providing the flow-turbulating structure in the generating channel 201, the composite colloidal material and water will collide and contact more fully after entering the generating channel 201 under the disturbing effect of the flow-turbulating structure, thereby enabling the composite colloidal material and water to be mixed more evenly in the generating channel 201.

[0095] Further, see Figure 5 and Figure 11 The spoiler structure includes a plurality of spoiler baffles 23, which are arranged on the inner wall surface of the generating channel 201 at intervals along the circumferential direction. Each spoiler baffle 23 is a curved plate structure. Each spoiler baffle 23 has a first edge 231 and a second edge 232 opposite to each other in the axial direction of the generating channel 201, and a third edge 233 and a fourth edge 234 opposite to each other in the radial direction of the generating channel 201. The second edge 232 is located on the side of the first edge 231 away from the channel inlet 2011, and the third edge 233 is located on the side of the fourth edge 234 away from the central axis of the generating channel 201. Each adjacent The first edge 231 of one of the two spoiler baffles 23 and the second edge 232 of the other spoiler baffle 23 are both bent and extended in the direction from the third edge 233 to the fourth edge 234 toward the direction close to the reference reference area 230, and the second edge 232 of one spoiler baffle 23 and the first edge 231 of the other spoiler baffle 23 are both bent and extended in the direction from the third edge 233 to the fourth edge 234 toward the direction away from the reference reference area 230, wherein the reference reference area 230 is the inner peripheral wall of the generating channel 201 located between the two adjacent spoiler baffles 23. As a result, the spoiler structure has a better spoiler effect on the mixing of water and material, and the water and material can be more fully mixed in the generating channel 201. Optionally, the spoiler baffle 23 can be fixed to the inner wall surface of the generating channel 201 by welding, bolting or integral molding.

[0096] Further, see Figure 7 , the second edge 232 is located in the generating channel 201, and the distance L between the second edge 232 and the channel outlet 2012 is greater than or equal to 30 mm. In other words, the distance L between the second edge 232 and the channel outlet 2012 can be 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, or 35 mm, etc. It can be understood that although the flow-disturbing structure plays a role in disturbing and fully mixing the water material in the generating channel 201, it also has a dispersing effect on the water material and the slurry formed by the reaction of the water material. By making the distance L between the second edge 232 and the channel outlet 2012 greater than or equal to 30 mm, the slurry can be gathered and then sprayed from the channel outlet 2012 to the spraying operation area, so that the slurry is more concentrated and the spraying distance is longer.

[0097] Optionally, see Figure 12-13 The channel outlet 2012 of the shotcrete generator 20 may further be provided with a contraction section 27, the cross-sectional area of ​​which decreases in the direction away from the channel outlet 2012. During the shotcrete spraying, the slurry formed by the mixing and preliminary reaction of the water and materials in the channel 201 is contracted and gathered by the contraction section 27 before being sprayed toward the shotcrete operation area, thereby extending the shotcrete spraying distance.

[0098] In some embodiments of this application, please refer to Figure 7 The atomization chamber 202 is arranged around the circumference of the generating channel 201, and multiple atomization outlets 2022 are arranged between the atomization chamber 202 and the generating channel 201 and distributed along the circumference of the generating channel 201, thereby simplifying the overall structure of the spraying device 100.

[0099] Further, see Figures 4-10 The spray generator 20 includes a first spray generating member 21 and a second spray generating member 22 that are detachably connected. The first spray generating member 21 and the second spray generating member 22 are both annular cylindrical. One end of the second spray generating member 22 is inserted into one end of the first spray generating member 21. A part of the generating channel 201 is formed in the first spray generating member 21, and another part of the generating channel 201 is formed in the second spray generating member 22. The turbulence structure is provided in the second spray generating member 22. The channel inlet 2011 is formed at the other end of the first spray generating member 21, and the channel outlet 2012 is formed at the other end of the second spray generating member 22. The atomization chamber 202 is formed between one end of the first spray generating member 21 and one end of the second spray generating member 22. The atomization outlet 2022 is provided on the peripheral wall of the second spray generating member 22 and passes through the peripheral wall of the second spray generating member 22. The atomization inlet 2021 is provided on the peripheral wall of the first spray generating member 21. By making the spraying generator 20 include the first spraying generating part 21 and the second spraying generating part 22 which are detachably connected, the spraying generator 20 has a simple structure and is convenient for disassembly, assembly and cleaning.

[0100] Optionally, see Figure 7 and Figure 9, the range of the angle α between the center line of the atomizing outlet 2022 and the central axis of the generating channel 201 is 30 ° ~ 60 °. That is to say, the angle α between the center line of the atomizing outlet 2022 and the central axis of the generating channel 201 is greater than or equal to 30 °, and less than or equal to 60 °. Exemplarily, the angle α is 30 °, 35 °, 40 °, 45 °, 50 °, 55 ° or 60 °, etc. By making the range of the angle α between the center line of the atomizing outlet 2022 and the central axis of the generating channel 201 be 30 ° ~ 60 °, the high-pressure water-gas mixed fluid in the atomizing chamber 202 enters the generating channel 201 through the atomizing outlet 2022, and can be better mixed with the composite colloid material entering the generating channel 201 by the channel inlet 2011, and the reaction is more sufficient.

[0101] Optionally, the diameter of the atomizing outlet 2022 ranges from 3 mm to 5 mm. That is, the diameter of the atomizing outlet 2022 is greater than or equal to 3 mm and less than or equal to 5 mm. Exemplarily, the diameter of the atomizing outlet 2022 can be 3 mm, 3.5 mm, 4.0 mm, 4.5 mm, or 5.0 mm, etc. By making the diameter of the atomizing outlet 2022 range from 3 mm to 5 mm, not only can the high-pressure water-gas mixed fluid in the atomizing chamber 202 smoothly enter the generating channel 201, but also can ensure that the water material is evenly mixed in the generating channel 201.

[0102] For further information, please refer to Figure 4-10The first spray generating member 21 includes a first spray generating section 211 and a second spray generating section 212 connected to each other, the inner diameter d1 of the first spray generating section 211 is smaller than the inner diameter d2 of the second spray generating section 212, a first step surface 213 is formed between the inner circumferential wall of the first spray generating section 211 and the inner circumferential wall of the second spray generating section 212, and the channel inlet 2011 is formed at one end of the first spray generating section 211 away from the second spray generating section 212. The second spray generating member 22 includes a third spray generating section 221 and a fourth spray generating section 222 connected to each other. The channel outlet 2012 is formed at one end of the fourth spray generating section 222 away from the third spray generating section 221. The outer diameter D1 of the third spray generating section 221 is smaller than the outer diameter D2 of the fourth spray generating section 222. A second step surface 223 is formed between the outer peripheral wall of the third spray generating section 221 and the outer peripheral wall of the fourth spray generating section 222. A plurality of atomization outlets 2022 are all arranged on the second step surface 223 and pass through the second step surface 223. The outer diameter D1 of the third spraying section 221 is smaller than the inner diameter d2 of the second spraying section 212. The third spraying section 221 is loosely fitted within the second spraying section 212. One end of the third spraying section 221 away from the fourth spraying section 222 is supported on the first step surface 213. At least a portion of the fourth spraying section 222 is sealed within the second spraying section 212. The outer peripheral wall of the third spraying section 221, the inner peripheral wall of the second spraying section 212, the first step surface 213, and the second step surface 223 define an atomizing chamber 202. The atomizing inlet 2021 is provided on the peripheral wall of the second spraying section 212. This makes the spraying generator 20 simple in structure and convenient for production and processing.

[0103] Further, see Figure 7-Figure 8 and Figure 10 A first sealing ring 24 is provided between the third spraying section 221 and the first step surface 213 . By providing the first sealing ring 24 , the sealing performance of the atomizing chamber 202 can be improved, thereby preventing the atomizing chamber 202 from leaking.

[0104] Further, see Figure 7 and Figure 10 The edge of the inner peripheral wall of the first step surface 213 away from the second spraying section 212 is provided with an annular convex rib 2131 protruding toward the direction away from the channel inlet 2011. An annular positioning groove 21311 is defined between the annular convex rib 2131, the first step surface 213 and the inner peripheral wall of the second spraying section 212. The first sealing ring 24 is arranged in the positioning groove 21311. By providing the positioning groove 21311, the installation positioning of the first sealing ring 24 is accurate and stable.

[0105] Optionally, the fourth spraying section 222 and the second spraying section 212 are threadedly matched, so that the connection between the first spraying component 21 and the second spraying component 22 can be achieved. The connection is stable and reliable, and easy to assemble and disassemble. At the same time, the sealing fit between the fourth spraying section 222 and the second spraying section 212 can also be achieved.

[0106] Furthermore, Figure 7-Figure 8 The fourth spray generating section 222 includes an inserted spray generating section 2221 and an extended spray generating section 2222 connected to each other. The inserted spray generating section 2221 is sealed and fitted in the second spray generating section 212. The extended spray generating section 2222 is located outside the second spray generating section 212. The outer diameter of the inserted spray generating section 2221 is smaller than the outer diameter of the extended spray generating section 2222. A third step surface 2223 is provided between the inserted spray generating section 2221 and the extended spray generating section 2222. The third step surface 2223 is opposite to the end face of the second spray generating section 212, and a second sealing ring 25 is provided between the third step surface 2223 and the end face of the second spray generating section 212, thereby further improving the sealing performance of the atomization chamber 202.

[0107] See also Figure 1-Figure 3 , the spraying device 100 may also include a triangular bracket 71 and a universal joint 72. The spraying generator 20 is supported on the triangular bracket 71, and the spraying generator 20 and the triangular bracket 71 are connected by the universal joint 72. In this way, by supporting the spraying generator 20 on the triangular bracket 71, during the spraying process, the operator does not need to lift the spraying generator 20, which saves effort and is convenient. In addition, the spraying generator 20 and the triangular bracket 71 are connected by the universal joint 72, and the spraying generator 20 can rotate relative to the triangular bracket 71. During the spraying operation, when the spraying direction needs to be adjusted, there is no need to move the triangular bracket 71, and it can be adjusted by rotating the spraying generator 20. Please continue to read Figure 1-Figure 3 Hanging rings 26 are provided on both sides of the spraying generator 20, and the spraying operator can control the spraying generator 20 by holding the hanging rings 26 during the spraying process.

[0108] Of course, the present application is not limited to this. In some other embodiments, the spraying device 100 may not include the above-mentioned triangular bracket 71 and universal joint 72 for support and positioning, and the spraying generator 20 may be hung on the coal mining face bracket through a lifting belt.

[0109] According to the second embodiment of the present application, the spraying fire prevention and extinguishing method uses the spraying device 100 according to the first embodiment of the present application to perform spraying fire prevention and extinguishing. The spraying fire prevention and extinguishing method includes:

[0110] The water-gas delivery component is controlled to deliver high-pressure water at a constant flow rate toward the atomization inlet 2021 , and to deliver high-pressure gas at a constant flow rate toward the atomization inlet 2021 , so that the water required for pulping is delivered to the generating channel 201 in the form of a high-pressure water-gas mixed fluid at a constant flow rate.

[0111] The water vapor delivery assembly is controlled to deliver high-pressure gas toward the air amplifier assembly, so that the composite colloidal material in the storage chamber 11 is delivered to the generating channel 201 at a constant flow rate under the drive of the air amplifier assembly. In the generating channel 201, the composite colloidal material and the water required for slurrying are mixed according to a set mass ratio and initially react to form a slurry in a state between powder and gel. The slurry is then sprayed from the channel outlet 2012 toward the spraying operation area.

[0112] According to the spraying fire prevention and extinguishing method of the embodiment of the present application, by adopting the spraying device 100 of the first embodiment of the present application, the spraying fire prevention and extinguishing method has all the advantages of the spraying device 100 of the first embodiment, which will not be elaborated here.

[0113] Optionally, when the spraying device 100 used in the spraying fire prevention and extinguishing method includes the branch water supply control valve 91, the main water supply control valve 93 and the main air supply control valve 94 in the above embodiment, the spraying fire prevention and extinguishing method also includes: after the spraying is completed, first close the branch water supply control valve 91, and after an interval of 0.5s~1s, close the double valve composed of the main water supply control valve 93 and the main air supply control valve 94.

[0114] When the branch water supply control valve 91 is closed, water can no longer enter the atomization chamber 202 through the atomization inlet 2021. At this time, the water supply in the spray generator 20 stops; when the main water supply control valve 93 and the main air supply control valve 94 that constitute the double valve are closed, air can no longer enter the spray generator 20. At this time, the air supply in the spray generator 20 also stops.

[0115] That is, after the spraying is completed, the water supply and air supply to the spray generator 20 are not stopped simultaneously. The water supply is stopped for 0.5 to 1 second (e.g., 0.5, 0.6, 0.7, 0.8, or 1.0 second), followed by the air supply. This allows the water remaining in the atomization chamber 202 and the generation channel 201 of the spray generator 20 to be completely discharged through the channel outlet 2012 under pneumatic drive when the branch water supply control valve 91 is closed (water supply is stopped). This prevents the water remaining in the spray generator 20 from flowing back into the feed pipe 31 through the channel inlet 2011. Consequently, during the next round of spraying, the composite colloid material reacts with water in the feed pipe 31 to form a gel, thereby clogging the feed pipe 31.

[0116] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0117] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0118] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A spraying device for spraying composite colloidal materials, characterized in that: The spraying device comprises: A material storage box, wherein a material storage cavity for storing the composite colloid material is defined in the material storage box, and the material storage box is provided with a material discharge port communicating with the material storage cavity; A spray generator, wherein a generating channel and an atomizing chamber are defined in the spray generator, the generating channel has a channel inlet and a channel outlet, the atomizing chamber has an atomizing inlet and a plurality of atomizing outlets, the atomizing chamber and the generating channel are connected through the plurality of atomizing outlets, the atomizing chamber is arranged around the circumference of the generating channel, the plurality of atomizing outlets are arranged between the atomizing chamber and the generating channel and are distributed at intervals along the circumference of the generating channel, the spray generator includes a first spray generating member and a second spray generating member that are detachably connected, the first spray generating member and the second spray generating member are both annular cylindrical, and the second spray generating member is One end is inserted into one end of the first spray generating member, a part of the generating channel is formed in the first spray generating member, the other part of the generating channel is formed in the second spray generating member, the channel inlet is formed at the other end of the first spray generating member, the channel outlet is formed at the other end of the second spray generating member, the atomization chamber is formed between the one end of the first spray generating member and the one end of the second spray generating member, the atomization outlet is provided on the peripheral wall of the second spray generating member and passes through the peripheral wall of the second spray generating member, and the atomization inlet is provided on the peripheral wall of the first spray generating member; a water-gas delivery assembly for delivering high-pressure water and high-pressure gas into the atomizing chamber through the atomizing inlet so that a high-pressure water-gas mixed fluid flows into the atomizing chamber, and the high-pressure water-gas mixed fluid can be dispersed and sprayed into the generating channel through the plurality of atomizing outlets; An air amplifier component is connected between the discharge port and the channel inlet, and the water vapor delivery component delivers high-pressure gas thereto as an induced driving force to drive the composite colloidal material in the storage chamber to be delivered to the generating channel. In the generating channel, the composite colloid material and the high-pressure water-gas mixed fluid are mixed and preliminarily reacted to form a slurry in a state between powder and gel, which is then sprayed from the channel outlet to the spraying operation area.

2. The spraying device for spraying composite colloidal materials according to claim 1, characterized in that: The grouting operation area is the corner area of ​​the coal mining working face or the area behind the coal mining working face.

3. The spraying device for spraying composite colloidal materials according to claim 1, characterized in that: The air amplifier assembly comprises: A material delivery pipe, the material delivery pipe comprising a material delivery inlet and a material delivery outlet, the material delivery inlet being connected to the material discharge port, and the material delivery outlet being connected to the channel inlet; A first air amplifier and a second air amplifier, the first air amplifier is arranged between the discharge port and the material inlet, the first air amplifier has a first suction port, a first blow-out port and a first high-pressure gas inlet, the first suction port is connected with the discharge port, the first blow-out port is connected with the material inlet, the second air amplifier is arranged between the material outlet and the channel inlet, the second air amplifier has a second suction port, a second blow-out port and a second high-pressure gas inlet, the second suction port is connected with the material outlet, the second blow-out port is connected with the channel inlet, the first high-pressure gas inlet and the second high-pressure gas inlet are both connected to the water vapor conveying component.

4. The spraying device for spraying composite colloid materials according to claim 3, characterized in that: The water vapor delivery assembly includes a gas supply assembly, which is used to deliver high-pressure gas toward the first high-pressure gas inlet, the second high-pressure gas inlet and the atomization inlet, and the gas supply assembly includes: a distributor, the distributor comprising an input port, a first output port, a second output port, and a third output port, the input port being adapted to be connected to a high-pressure gas source; a first high-pressure gas delivery pipe connected between the first output port and the first high-pressure gas inlet; a second high-pressure gas delivery pipe connected between the second output port and the second high-pressure gas inlet; A third high-pressure gas delivery pipe is connected between the third output port and the atomization inlet.

5. The spraying device for spraying composite colloidal materials according to claim 4, characterized in that: The water vapor conveying component also includes a water supply component, which is used to transport high-pressure water toward the atomization inlet. The water supply component includes a pressure reducing valve, a water supply pipe and a pressure gauge. The pressure reducing valve has a water inlet, a water outlet and a pressure gauge interface. The water inlet is suitable for connecting to a high-pressure water source, the water outlet is connected to one end of the water supply pipe, the pressure gauge interface is connected to the pressure gauge, and the other end of the water supply pipe is connected to the atomization inlet.

6. The spraying device for spraying composite colloidal materials according to claim 5, characterized in that: The spraying device also includes: a branch water supply control valve, the branch water supply control valve being provided between the other end of the water supply pipe and the atomizing inlet; A main water supply control valve and a main air supply control valve, wherein the main water supply control valve is arranged between the water inlet and the high-pressure water source, and the main air supply control valve is arranged between the input port and the high-pressure air source, and the main water supply control valve and the main air supply control valve constitute a double valve.

7. The spraying device for spraying composite colloidal materials according to claim 1, characterized in that: A flow-disturbing structure is provided in the generating channel, and at least a portion of the flow-disturbing structure is located between the atomizing outlet and the channel outlet. In the generating channel, the composite colloid material and the high-pressure water-gas mixed fluid are fully and evenly mixed under the action of the flow-disturbing structure. The spoiler structure includes a plurality of spoiler baffles, which are arranged on the inner wall surface of the generating channel at intervals along the circumferential direction, each of the spoiler baffles is a curved plate structure, and each of the spoiler baffles has a first edge and a second edge opposite to each other in the axial direction of the generating channel, and a third edge and a fourth edge opposite to each other in the radial direction of the generating channel, the second edge is located on a side of the first edge away from the channel inlet, and the third edge is located on a side of the fourth edge away from the central axis of the generating channel. The first edge of one spoiler baffle and the second edge of the other spoiler baffle of each adjacent two spoiler baffles are both bent and extended in a direction from the third edge to the fourth edge toward a direction close to the reference area, and the second edge of the one spoiler baffle and the first edge of the other spoiler baffle are both bent and extended in a direction from the third edge to the fourth edge toward a direction away from the reference area. Wherein, the reference area is the inner peripheral wall of the generating channel located between the two adjacent spoiler baffles.

8. The spraying device for spraying composite colloidal materials according to claim 1, characterized in that: The first spraying member includes a first spraying section and a second spraying section connected to each other, the inner diameter d1 of the first spraying section is smaller than the inner diameter d2 of the second spraying section, a first step surface is formed between the inner circumferential wall of the first spraying section and the inner circumferential wall of the second spraying section, and the channel inlet is formed at an end of the first spraying section away from the second spraying section; The second spray generating member includes a third spray generating section and a fourth spray generating section connected to each other, the channel outlet is formed at one end of the fourth spray generating section away from the third spray generating section, the outer diameter D1 of the third spray generating section is smaller than the outer diameter D2 of the fourth spray generating section, a second step surface is formed between the outer peripheral wall of the third spray generating section and the outer peripheral wall of the fourth spray generating section, and the plurality of atomization outlets all penetrate the second step surface, Among them, the third spraying section is loosely fitted in the second spraying section, one end of the third spraying section away from the fourth spraying section is supported on the first step surface, at least a part of the fourth spraying section is sealed in the second spraying section, the outer peripheral wall of the third spraying section, the inner peripheral wall of the second spraying section, the first step surface and the second step surface define the atomization cavity, and the atomization inlet is arranged on the peripheral wall of the second spraying section.

9. The spraying device for spraying composite colloid materials according to claim 1 or 8, characterized in that: The angle α between the center line of the atomization outlet and the center axis of the generating channel is in the range of 30° to 60°.

10. A method for spraying fire prevention and extinguishing, characterized in that: The spraying fire prevention and extinguishing method uses the spraying device according to any one of claims 1 to 9 to perform spraying fire prevention and extinguishing, and the spraying fire prevention and extinguishing method includes: Controlling the water-gas delivery component to deliver the high-pressure water at a constant flow rate toward the atomizing inlet, and to deliver the high-pressure gas at a constant flow rate toward the atomizing inlet, so that the water required for pulping is delivered to the generating channel in the form of the high-pressure water-gas mixed fluid at a constant flow rate; The water vapor conveying component is controlled to convey the high-pressure gas toward the air amplifier component, so that the composite colloidal material in the storage chamber is conveyed to the generating channel at a constant flow rate under the drive of the air amplifier component. In the generating channel, the composite colloidal material and the water required for pulping are mixed according to a set mass ratio and preliminarily reacted to form a slurry in a state between powder and gel, and then sprayed from the channel outlet to the spraying operation area.

11. A method for spraying fire prevention and extinguishing, characterized in that: The spraying fire prevention and extinguishing method uses the spraying device according to claim 6 to perform spraying fire prevention and extinguishing, and the spraying fire prevention and extinguishing method includes: Controlling the water-gas delivery component to deliver the high-pressure water at a constant flow rate toward the atomizing inlet, and to deliver the high-pressure gas at a constant flow rate toward the atomizing inlet, so that the water required for pulping is delivered to the generating channel in the form of the high-pressure water-gas mixed fluid at a constant flow rate; Controlling the water vapor conveying assembly to convey the high-pressure gas toward the air amplifier assembly, so that the composite colloidal material in the storage chamber is conveyed to the generating channel at a constant flow rate under the drive of the air amplifier assembly. In the generating channel, the composite colloidal material and the water required for pulping are mixed according to a set mass ratio and preliminarily reacted to form a slurry in a state between powder and gel, and then sprayed from the channel outlet toward the spraying operation area; The spraying fire prevention and extinguishing method further comprises: After the spraying is completed, the branch water supply control valve is closed first, and after an interval of 0.5s to 1s, the main water supply control valve and the main air supply control valve are closed.

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