Stirring device for preparing fire preventing and extinguishing foaming material and using method

Abstract

The invention belongs to the technical field of fire preventing and extinguishing material processing, and particularly relates to a fire preventing and extinguishing foaming material preparing and stirring device and a using method thereof, and the fire preventing and extinguishing foaming material preparing and stirring device comprises a supporting frame, a stirring container, a power output unit, a stirring assembly and a gas injection assembly. The power output unit comprises a rotary driving assembly, an inner shaft and a plurality of outer shafts, the inner shaft and the outer shafts are inserted into the stirring container, each outer shaft is provided with a vibration piece, and the vibration pieces are used for generating vibration impact in the stirring container so as to act on materials; the stirring assembly is composed of a plurality of transmission wheels arranged on the inner shaft in a sleeving mode and a plurality of stirring blades arranged on the circumferential sides of the transmission wheels, the transmission wheels and the stirring blades are all arranged in a cavity mode, cavities of the stirring blades, the transmission wheels and the inner shaft are communicated, and a plurality of air holes are formed in the stirring blades; the input end of the gas injection assembly communicates with the inner shaft and is used for inputting carbon dioxide or nitrogen into the stirring container through the gas hole. According to the device, the inhibition rate and the inerting performance of the prepared fire preventing and extinguishing material can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fire prevention and extinguishing material processing, and particularly relates to a stirring device for preparing a fire prevention and extinguishing foaming material and a using method thereof. Background Art

[0002] Spontaneous combustion of coal in coal mines is one of the major underground disasters. The fires caused by it not only result in waste of resources, but also may induce secondary disasters such as gas explosions. In current fire prevention and extinguishing technologies, foam materials, due to their special physical and chemical properties, show remarkable effects in oxygen isolation and leakage plugging, providing an effective means for quickly sealing fire areas. Taking three-phase foam as an example, it consists of a gas phase (such as an inert gas), a liquid phase (an aqueous solution), and a solid phase (particulate matter). The gas phase reduces the oxygen concentration and inhibits the oxidation reaction; the liquid phase fills the pores, evaporates and absorbs heat, and forms a water vapor oxygen isolation layer; the solid phase provides a skeleton support to enhance the foam stability. The three work together to effectively prevent oxygen from contacting the fire source and achieve oxygen isolation and leakage plugging.

[0003] Although the existing three-phase foam fire prevention and extinguishing material technology can effectively block the air leakage fissure channels by using the skeleton structure formed by the foam body, and the inert gas can be slowly released by being loaded in the foam pores. The combination of the two can not only block the physical path of coal-oxygen contact, but also reduce the local oxygen concentration through the inert gas, forming a "dual protection mechanism of oxygen isolation - displacement". However, in the production process of three-phase foam fire prevention and extinguishing materials, in order to optimize the pore distribution and the inert gas injection method, a stirring device is usually required to mix the gas-liquid two-phase and the solid-phase fire prevention and extinguishing foaming base material. However, the current stirring equipment has poor stirring effect, especially it is difficult to ensure the uniform distribution of the gas-liquid two-phase in combination with the foam pore structure, the flow between materials is insufficient, and the mixing uniformity is insufficient, resulting in the incomplete exertion of the synergistic advantages of each phase of the produced material. For example, the Chinese patent with the patent number CN113457502A provides a stirring device and its multi-axis stirrer. Its main structure realizes efficient transmission and stirring through the meshing of an active turbine-type wire gear and multiple driven paddle-type wire gears to improve the stirring efficiency. However, the stirring path of the blades is unique during the stirring process of this stirrer, and the interaction effect between liquids is poor, resulting in insufficient fluidity between materials. Another example is the Chinese patent with the patent number CN200320100840.2, which discloses a multi-stirring blade stirrer device. Its structure consists of multiple stirring blades evenly distributed along the stirring shaft. During use, the stirring shaft drives the stirring blades to rotate and cut the materials to achieve stirring. Similarly, limited by the stirring path of the blades, the direction of the stirring force is single, which is easy to form a stirring vortex, resulting in a concentration gradient of the inner and outer layer materials near and far from the stirring shaft, leading to insufficient material flow and reduced mixing efficiency. Summary of the Invention

[0004] To solve the problems existing in the prior art, the object of the present invention is to provide a stirring device and a using method for preparing a fire prevention and extinguishing foaming material, which can promote the fluidity between materials during the preparation of the fire prevention and extinguishing material, fully mix and homogenize the gas-phase, liquid-phase and solid-phase components, and improve the inhibition rate and inerting performance of the prepared material during subsequent use.

[0005] The technical solution of the present invention is as follows: A stirring device and a using method for preparing a fire prevention and extinguishing foaming material, including a stirring container and a power output unit. The power output unit has an inner shaft inserted into the stirring container. The inner shaft is a hollow tube body, and further includes: A vibration assembly, arranged in the stirring container. The vibration assembly includes a plurality of outer shafts and vibration plates. The plurality of outer shafts are circumferentially and arrayedly distributed on the periphery of the inner shaft. The upper end of the outer shaft is rotationally connected to the inner shaft. A plurality of vibration plates are installed on each outer shaft. The vibration assembly is used to generate vibration impacts in the stirring container to act on the materials. A stirring assembly, arranged in the stirring container, including a plurality of hollow transmission wheels spacedly sleeved and fixed on the inner shaft. A plurality of inclined hollow stirring blades are arranged on the periphery of the transmission wheels, and the inclination angles of adjacent two stirring blades are different. The hollow cavities of the stirring blades, the transmission wheels and the inner shaft are communicated, and a plurality of air holes are opened on the stirring blades. A gas injection assembly, whose input end is communicated with the inner shaft, and is used to input carbon dioxide or nitrogen into the stirring container through the air holes on the stirring blades.

[0006] Preferably, a micro piezoelectric film is embedded in the air hole. A through hole coaxial with the air hole is arranged on the micro piezoelectric film. The micro piezoelectric film is electrically connected to a control system, and the control system is used to regulate the voltage applied to the micro piezoelectric film.

[0007] Preferably, the dynamic adjustment range of the micro piezoelectric film is 0.1 mm to 2 mm.

[0008] Preferably, the vibration plate is electrically connected to the control system. The frequency of the vibration plate is 50 Hz to 200 Hz, and the amplitude is 0.1 mm to 1 mm.

[0009] Preferably, the inclination angle of the stirring blade is 10° to 30°, and the inclination angles of the plurality of stirring blades change in a gradient along the axial direction of the transmission wheel.

[0010] Preferably, the aperture of the air hole is 0.5 mm to 3 mm.

[0011] Preferably, the plurality of air holes on the stirring blade are arranged at equal intervals along the curve direction of the stirring blade, and the apertures of the plurality of air holes gradually decrease from the direction close to the inner shaft to the direction away from the inner shaft.

[0012] Preferably, the plurality of air holes on the stirring blade are distributed in a honeycomb shape, and the plurality of air holes expand from the center of the stirring blade to the surroundings in a scaling ratio of 0.5 to 0.9.

[0013] Preferably, the gas injection assembly includes a gas delivery pipeline, a gas storage tank, and a fluid control module. One end of the gas delivery pipeline is connected to the gas storage unit, and the other end is communicated with the cavity of the inner shaft. The fluid control module is arranged on the gas delivery pipeline, and the fluid control module includes a switch valve, a digital pressure monitor, and a flow monitor that are sequentially arranged on the gas delivery pipeline.

[0014] Preferably, according to the above-mentioned stirring device for preparing a fire prevention and extinguishing foaming material, its usage method includes the following steps: S1. Put the mine fire prevention and extinguishing foaming base material and water into the stirring container, control the inner shaft (1) to drive the stirring blade (42) to stir the fire prevention and extinguishing foaming base material and water at a speed of 800 rpm to 1000 rpm, so that the fire prevention and extinguishing foaming base material and water are evenly mixed to form a fire prevention and extinguishing foaming solution, and then take it out; S2. First add the fire prevention and extinguishing base material to the stirring container, adjust the inner shaft (1) to drive the stirring blade (42) to perform dry mixing and stirring on the fire prevention and extinguishing aggregate at a speed of 200 rpm to 500 rpm. After the dry mixing and stirring are completed, add water to the stirring container, adjust the inner shaft (1) to drive the stirring blade (42) to rotate at a speed of 1000 rpm to 1500 rpm, and at the same time start the vibrating piece (3) on the outer shaft (2) to apply vibration to the materials in the stirring container, stir evenly to form a fire prevention and extinguishing matrix solution, and then take it out; S3. First put the fire prevention and extinguishing foaming solution into the stirring container, keep the rotation speed of the inner shaft (1) at 1000 rpm to 1500 rpm and the vibration of the vibrating piece (3) to start stirring the fire prevention and extinguishing foaming solution. During the stirring process, gradually inject the fire prevention and extinguishing matrix solution, and at the same time start the gas injection assembly (5) to inject carbon dioxide or nitrogen into the stirring container at a flow rate of 0.1 mL / min to 0.5 mL / min, and adjust the gas pressure to 0.5 MPa to 3 MPa until the fire prevention and extinguishing foaming solution and the fire prevention and extinguishing gel matrix solution are mixed to form a pore structure; S4. Extract samples from the mixed materials and conduct characterization parameter tests. When the test results of the characterization parameters are less than the preset values, return to step S3, adjust the rotation speed of the inner shaft (1), the vibration parameters of the vibration plate (3), and the flow rate and pressure of carbon dioxide or nitrogen, repeat stirring for a period of time, and conduct characterization parameter tests on the materials again until the material characterization parameter values are greater than or equal to the preset values, thus completing the stirring.

[0015] Compared with the prior art, the stirring device and its usage method for preparing a fire - prevention and extinguishing foaming material of the present invention have the following beneficial effects: When preparing the fire - prevention foaming material, this device can drive the inner shaft by using the power output unit, enabling the inner shaft to drive the stirring blades to rotate. When the inner shaft drives the stirring blades with different angles of inclination to rotate, multi - directional shear forces are formed. At the same time, while the inner shaft is rotating, the required carbon dioxide or nitrogen can be output from the air holes at the bottom of the stirring blades through the cavities of the inner shaft, transmission wheels, and stirring blades by the gas injection component. Along with the rotation of the stirring blades, carbon dioxide or nitrogen is fully mixed into the materials. And through the adjustment of the gas input pressure, the inclined setting of multiple layers of stirring blades, and the vibration of the vibration plates on multiple outer shafts acting on the materials, the gas is dispersed directionally along a three - dimensional gradient path, thereby promoting the fluidity between the materials, fully mixing the gas - phase, liquid - phase, and solid - phase components evenly, and effectively improving the inhibition rate and inert properties of the prepared fire - prevention foaming material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure in an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the stirring blades in an embodiment of the present invention; Figure 3 It is a first - type distribution structure schematic diagram of the air holes in an embodiment of the present invention; Figure 4 It is a partial enlarged schematic diagram of the second - type distribution structure of the air holes in an embodiment of the present invention; Figure 5 It is a schematic diagram of the structure of the high - pressure spraying system in an embodiment of the present invention.

[0017] DESCRIPTION OF THE REFERENCE NUMERALS: 1. Inner shaft; 2. Outer shaft; 3. Vibration plate; 4. Stirring assembly; 41. Transmission wheel; 42. Stirring blade; 43. Air hole; 5. Gas injection component; 51. Gas delivery pipeline; 52. Gas storage tank; 53. Switch valve; 54. Digital pressure monitor; 55. Flow monitor; 6. Control system; 7. Support frame; 8. Scraper. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0020] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0021] See Figures 1 to 3 As shown, in order to promote the fluidity between materials during the preparation of fire prevention and extinguishing materials, fully mix the gaseous, liquid and solid component materials, and improve the inhibition rate and inerting performance of the materials during subsequent use, this embodiment provides a stirring device and a use method for preparing fire prevention and extinguishing foaming materials. Among them, the stirring device for preparing fire prevention and extinguishing foaming materials includes a support frame 7, a stirring container, a power output unit, a vibration assembly, a stirring assembly 4 and a gas injection assembly 5, and also includes a control system 6 for controlling the execution operations of each component. The stirring container is arranged on the support frame 7, and the support frame 7 includes a base and a support rod; the base is used to place the stirring container for holding materials; the height of the support rod is adjustable and suitable for placing stirring containers of different heights.

[0022] See Figure 1 As shown, the power output unit includes a rotary drive assembly and an inner shaft 1. The inner shaft 1 is a hollow structure with both ends blocked. The rotary drive assembly is installed on the support frame 7. The inner shaft 1 is inserted into the stirring container, and the upper end of the inner shaft 1 passes through the stirring container and is connected to the output end of the rotary drive assembly. The rotary drive assembly is used to drive the inner shaft 1 to rotate. The stirring assembly 4 is placed in the stirring container and arranged on the inner shaft 1, and the stirring assembly 4 stirs the materials in the stirring container by rotating the inner shaft 1.

[0023] The vibration assembly is also arranged inside the stirring container. The vibration assembly includes a plurality of outer shafts 2 and vibration plates 3. The plurality of outer shafts 2 are circumferentially and arrayedly distributed on the circumferential side of the inner shaft 1. Preferably, both the outer shaft 2 and the inner shaft 1 are vertically arranged, and the inner shaft 1 is parallel to the outer shaft 2. The upper end of the outer shaft 2 is rotatably connected to the inner shaft 1. A plurality of vibration plates 3 are installed on each outer shaft 2. The vibration assembly is used to generate vibration impacts inside the stirring container to act on the materials. Preferably, in order to ensure that the inner shaft 1 will not be interfered by the outer shafts 2 during rotation, a rotating cylinder is sleeved on the upper end of the inner shaft 1. The upper end of the outer shaft 2 is fixedly connected to the rotating cylinder through a connecting column, and the upper end of the rotating cylinder passes through the stirring container and is also connected to the rotation driving assembly, so as to realize the independent rotation of the outer shaft 2 and the inner shaft 1. The rotation driving assembly includes two independent motors. The output shaft of one motor is directly connected to the upper end of the inner shaft 1 to drive the inner shaft 1 to rotate. A driving bevel gear is sleeved on the output shaft of the other motor. The driving bevel gear meshes with a driven bevel gear, and the driven bevel gear is sleeved and fixed on the upper end of the rotating cylinder, so as to drive the rotating cylinder to drive the plurality of outer shafts 2 to rotate independently around the inner shaft 1. In this way, it can be ensured that the inner shaft 1 and the outer shaft 2 do not interfere with each other, and the rotation of the inner shaft 1 and the outer shaft 2 can be controlled separately.

[0024] See Figure 1 As shown, a plurality of vibration plates are evenly distributed on the circumferential side of each outer shaft 2. The vibration plates are electrically connected to the control system 6. The frequency of the vibration plates is 50 Hz to 200 Hz, and the amplitude is 0.1 mm to 1 mm. And in order to ensure the subsequent uniform stirring, the phase difference between the inner shaft 1 and the outer shaft 2 is 0° to 180°, which is convenient to form an intermittent cycle mode with the rotation of the stirring blades 42. In addition, the vibration plates are connected to the control system 6 through wires, and the control system 6 is used to control the opening and closing of the vibration plates.

[0025] See Figures 1 to 3 As shown, the stirring assembly 4 is arranged inside the stirring container, and includes a plurality of hollow transmission wheels 41 sleeved and fixed on the inner shaft 1 at intervals and a plurality of obliquely arranged stirring blades 42 arranged on the circumferential side of the transmission wheels 41. The inclination angles of two adjacent stirring blades 42 are different. In order to achieve the best stirring effect, the inclination angle of the stirring blades 42 is generally set between 10° and 30°, and the inclination angles of the plurality of stirring blades 42 are arranged in a gradient change manner along the axial direction of the transmission wheels 41. At the same time, both the transmission wheels 41 and the stirring blades 42 are set as hollow structures, and the cavities of the stirring blades 42, the transmission wheels 41 and the inner shaft 1 are communicated. At the same time, a plurality of air holes 43 with apertures of 0.5 mm to 3 mm are opened on the stirring blades 42.

[0026] See Figure 1As shown, the input end of the gas injection assembly 5 is connected to the inner shaft 1, and is used to input carbon dioxide or nitrogen into the stirring container through the air holes 43 on the stirring blades 42. The gas injection assembly 5 includes a gas delivery pipeline 51, a gas storage tank 52 and a fluid control module. One end of the gas delivery pipeline 51 is connected to the gas storage unit, and the other end is communicated with the cavity of the inner shaft 1. The fluid control module is arranged on the gas delivery pipeline 51, and the fluid control module includes a switch valve 53, a digital pressure monitor 54 and a flow monitor 55 arranged in sequence on the gas delivery pipeline 51.

[0027] Specifically, in use, the rotation drive assembly can independently drive the inner shaft 1 and the outer shaft 2, and can realize the inner shaft 1 driving the stirring blades 42 to rotate, and the outer shaft 2 driving the vibrating plate to rotate. When the inner shaft 1 drives the stirring blades 42 with different inclination angles at multiple layers to rotate, multi-directional shear forces are formed. At the same time, while the inner shaft 1 is rotating, the required carbon dioxide or nitrogen can be output from the air holes 43 at the bottom of the stirring blades 42 through the cavities of the inner shaft 1, the transmission wheel 41 and the stirring blades 42. Along with the rotation of the stirring blades 42, the carbon dioxide or nitrogen is fully mixed in the material, and through the adjustment of the gas input pressure and the inclined setting of the multi-layer stirring blades 42, and at the same time, the vibration of the vibrating plates 3 on the multiple outer shafts 2 acting on the material, the gas is dispersed directionally along the three-dimensional gradient path, which can promote the fluidity between the materials, and fully mix the gas-phase, liquid-phase and solid-phase components evenly, and can effectively improve the inhibition rate and inert performance of the prepared fireproof foaming material.

[0028] And by the above method when preparing the fireproof foaming material, a 'rotation-vibration' two-field coupling action mode formed by the rotation of the stirring blades 42 and the cooperation of the vibrating plates, combined with the gradient release control of carbon dioxide or nitrogen during the stirring process, further constructs a 'rotation-vibration-air curtain' three-field coupling synergistic action mechanism, significantly improving the stirring efficiency and mixing uniformity. This coupling mode not only optimizes the gas distribution during the stirring process, but also constructs a gas storage unit structure inside the foaming material. When the temperature or stress of the mine environment reaches the preset threshold, a directional slow-release mechanism will be triggered. This mechanism continuously displaces the oxygen in the pores of the coal body, thereby improving the reaction uniformity and enhancing the physical inhibition efficiency.

[0029] Furthermore, the control system 6 in the present device has a control panel, which includes a digital display screen, a power button, a speed knob and a mode button; through the mode button on the control panel, the user can select the motion mode of the composite stirring shaft, including "pure rotation" mode, "rotation + vibration" mode or "intermittent vibration" mode; the "pure rotation" mode refers to the inner shaft 1 rotating alone to drive the stirring blades 42 to shear the material; the "rotation + vibration" mode refers to the synergistic effect of the rotation shear of the inner shaft 1 and the vibration plate on the outer shaft 2; the "intermittent vibration" mode refers to the inner shaft 1 rotating and the vibration plate alternating to perform intermittent motion.

[0030] Furthermore, in the process of preparing fireproof foaming materials, in order to improve the filling uniformity of carbon dioxide or nitrogen between materials, and promote the fluidity between materials. First, a micro piezoelectric film is embedded in each pore 43 on the stirring blade 42, and a through hole coaxial with the pore 43 is provided on the micro piezoelectric film. The dynamic adjustment range of the micro piezoelectric film is 0.1mm~2mm. The micro piezoelectric film is electrically connected to the control system 6, and the voltage applied to the micro piezoelectric film is regulated by the control system 6, and the pore size can be adjusted according to the actual working conditions. Secondly, the distribution of the pores 43 on the stirring blade 42 can be set in the following two forms: First, as Figure 4 As shown, the pores 43 are arranged in a hexagonal structure, and the multiple pores 43 on each stirring blade 42 are distributed in a honeycomb shape, and the multiple pores 43 expand in a proportional manner from the center of the stirring blade 42 to the surroundings; secondly, as shown in FIG. Figure 3 As shown, the multiple pores 43 on the stirring blade 42 are arranged at equal intervals along the curved direction of the stirring blade 42, and the apertures of the multiple pores 43 gradually decrease from the direction close to the inner shaft 1 to the direction away from the inner shaft 1. Therefore, through the design in the above manner, the turbulent effect of gas diffusion can be effectively enhanced when the gas is injected, the directional diffusion effect of the gas along the three-dimensional gradient path is better, the fluidity between the materials is better, and the filling of carbon dioxide or nitrogen between the materials is more uniform, so that the resistance rate and inertness of the prepared fire-proof foaming material are improved.

[0031] According to the above-mentioned stirring device for preparing fire-proof foaming material, the specific method of using the stirring device in preparing fire-proof foaming material comprises the following steps: S1. Put the mining fire extinguishing foam base material and water into a stirring container, control the inner shaft 1 to drive the stirring blade 42 to stir the fire extinguishing foam base material and water at a speed of 800rpm~1000rpm ("pure rotation" mode), so that the fire extinguishing foam base material and water are evenly mixed to form a fire extinguishing foam solution, and then take it out.

[0032] S2. First, add the fire prevention and extinguishing base material into the mixing container. Adjust the inner shaft 1 to drive the mixing blades 42 to dry-mix and stir the fire prevention and extinguishing aggregate at a speed of 200 rpm to 500 rpm ("pure rotation" mode). After the dry-mixing and stirring are completed, add water into the mixing container. Adjust the inner shaft 1 to drive the mixing blades 42 to rotate at a speed of 1000 rpm to 1500 rpm. At the same time, start the vibration plate 3 on the outer shaft 2 to apply vibration to the materials in the mixing container and stir evenly (either the "rotation + vibration" or "rotation + intermittent vibration" mode can be selected according to the actual situation here), forming a fire prevention and extinguishing matrix solution, and then take it out.

[0033] S3. First, pour the fire prevention and extinguishing foaming solution into the mixing container. Keep the rotation speed of the inner shaft 1 at 1000 rpm to 1500 rpm and the vibration of the vibration plate 3 to start stirring the fire prevention and extinguishing foaming solution. During the stirring process, gradually inject the fire prevention and extinguishing matrix solution. At the same time, start the gas injection component 5 to inject carbon dioxide or nitrogen into the mixing container at a flow rate of 0.1 mL / min to 0.5 mL / min, and adjust the gas pressure to 0.5 MPa to 3 MPa until the fire prevention and extinguishing foaming solution is mixed with the fire prevention and extinguishing gel matrix solution to form a pore structure, and then pause the stirring.

[0034] S4. Take samples of the mixed materials for characterization parameter testing. When the test results of the characterization parameters are less than the preset values, return to step S3, adjust the rotation speed of the inner shaft 1, the vibration parameters of the vibration plate 3, and the flow rate and pressure of carbon dioxide or nitrogen, repeat the stirring for a period of time, and then conduct the characterization parameter testing on the materials again until the characterization parameter values of the materials are greater than or equal to the preset values, and the stirring is completed.

[0035] Specifically designed according to the above device, it has the following advantages: 1. Structural design: In the mixing component, the inclination angles of adjacent mixing blades 42 change in a gradient (10° to 30°) and are axially distributed along the transmission wheel 41, forming multi-directional shear forces, generating three-dimensional eddies, breaking the material boundary layer, significantly improving the mixing uniformity of the gas-phase - liquid-phase - solid-phase three phases, and avoiding the concentration gradient problem between the inner and outer layers.

[0036] 2. Pore 43 design: Adopt a hexagonal fractal structure, and gradually expand in a way that the hexagonal pores 43 centered on the mixing blades 42 are proportionally reduced (scaling ratio is 0.5 to 0.9) to form a honeycomb-like uniform distribution. Through the fractal pores 43, the turbulent effect is enhanced, realizing the directional dispersion of gas along a three-dimensional gradient path, making carbon dioxide or nitrogen fully mixed with the foam evenly, and improving the inhibition rate.

[0037] 3. The inner shaft 1 rotates at a high speed (500 rpm to 1500 rpm) to drive the stirring blade 42, and the outer shaft 2 is provided with a vibrating piece. High-frequency vibration (50 Hz to 200 Hz) is applied to impose periodic impacts. The phase difference between the two is adjustable (0° to 180°). By regulating the phase difference (such as a 90° phase difference), a dynamic shear force field is formed, enhancing the fluidity of the material and increasing the mixing efficiency by 40% to 60%.

[0038] 4. The air hole 43 is embedded with a micro piezoelectric film, and the aperture (0.1 to 2 mm) is adjusted in real time by the air pressure difference driving system through the air hole 43, in combination with the vibration of the piezoelectric film on the outer shaft 2. The size of the air hole 43 of the traditional stirring device is fixed and cannot adapt to the requirements of different material viscosities or foaming stages. The present invention realizes the precise matching of gas flow rate and diffusion intensity by dynamically adjusting the aperture of the air hole 43 and vibration parameters (such as an amplitude of 0.1 mm to 1 mm).

[0039] 5. The "rotation-vibration-air curtain" three-field coupling action mode. The high-speed rotation of the inner shaft 1 (500 rpm to 1500 rpm) and the high-frequency vibration of the vibrating piece on the outer shaft 2 (50 Hz to 200 Hz, amplitude 0.1 mm to 1 mm) can operate independently or synchronously, with a phase difference of 0° to 180°. Through the multi-layer variable-angle staggered stirring blades 42 (the stirring blades 42 are periodically arranged according to an inclination angle change of 10° to 30° during installation) and the nested double-shaft drive structure, the inner shaft 1 generates a three-dimensional shear eddy current, and the outer shaft 2 realizes boundary layer breaking, significantly improving the mixing uniformity of the material and breaking through the traditional laminar flow mixing limit.

[0040] Secondly, the present invention uses a pressure difference-driven gas injection and an air hole 43 array. A piezoelectric film is embedded in the air hole 43, and a self-similar fractal air hole network (honeycomb layout) is formed through multi-scale air holes 43 (the aperture is dynamically adjustable from 0.1 mm to 2 mm), constructing a directional gas transportation channel. This design realizes the three-dimensional gradient diffusion of carbon dioxide or nitrogen and improves the inhibition rate.

[0041] The following are various actual application method expansions based on the above device and its usage method: Embodiment 1: Preparation of a gel foam material for preventing coal mine fires Take 1 part of sodium alginate, 0.1 part of tea saponin, 0.2 part of alkyl polyglycoside, and 0.1 part of L-calcium lactate.

[0042] S1. Dissolve 1 part of sodium alginate in 50 parts of deionized water and add it to the stirring container. The inner shaft drives the multi-layer variable-angle staggered stirring blades to stir the material at a speed of 800 rpm for 3 minutes to obtain a sodium alginate colloidal solution, and take it out.

[0043] S2. Add 0.2 parts of alkyl polyglycoside and 0.1 part of tea saponin into the stirring container in a ratio of 2:1. Select the "pure rotation" mode, adjust the inner shaft 1 to rotate at a speed of 300 rpm to dry-mix the alkyl polyglycoside and tea saponin for a period of time (the dry-mixing here can also be directly skipped). Then add 100 parts of water into the stirring container, adjust the inner shaft to drive the multi-layer variable-angle staggered stirring blades to perform multi-angle fine shearing on the materials at a speed of 1000 rpm, and then start the vibrating piece on the outer shaft to apply a high-frequency micro-amplitude vibration of 150 Hz and an amplitude of 0.8 mm to impact the materials by vibration to prevent the materials from adhering, fully mix the alkyl polyglycoside, tea saponin and water to form a fire prevention and extinguishing matrix solution (gel solution), and take it out.

[0044] S3. First, put the fire prevention and extinguishing foaming solution into the stirring container, keep the rotation speed of the inner shaft 1 in S2 at 1000 rpm - 1500 rpm and the vibration mode of the vibrating piece 3 to stir, and then gradually inject the fire prevention and extinguishing matrix solution during the stirring process to achieve the mixing of the two solutions. At the same time, use the control panel to start the gas injection component 5 to inject carbon dioxide or nitrogen into the stirring container at a flow rate of 0.30 mL / min, adjust the gas pressure to 2 MPa, the pore diameter of the air hole 43 is dynamically adjusted between 1 mm and 2 mm through the piezoelectric film, and at the same time gradually add 0.1 part of L-calcium lactate solution during the stirring process. After stirring evenly, a gel foam matrix solution is obtained, that is, a cell structure is formed, and the stirring is paused.

[0045] S4. Stirring effect evaluation: Extract samples from the mixed materials and conduct characterization parameter tests. When the test results of the characterization parameters are less than the preset values (that is, evaluated by the foaming multiple and half-life of the samples: the foaming multiple of the samples is 4 - 10 times; the half-life of the samples is measured by using relevant instruments (such as a liquid separation detector) to measure the time required for the sample foam to discharge 25% of the liquid ≥ 5 minutes. For some high-performance products, the required time length can be adjusted according to the actual mixed materials.), return to step S3, adjust the rotation speed of the inner shaft 1, the vibration parameters of the vibrating piece 3, and the flow rate and pressure of carbon dioxide or nitrogen, repeat the stirring for a period of time, and conduct the characterization parameter test on the materials again until the material characterization parameter values are greater than or equal to the preset values to complete the stirring.

[0046] Embodiment 2: Preparation of coal mine fire prevention and extinguishing fly ash-based foam material Implementation steps: S1. Construct a foaming system: Take 0.4 parts of sodium dodecyl sulfate and add it to 100 parts of water. Adjust the inner shaft 1 to drive the stirring blade 42 to stir at a speed of 800 rpm - 1000 rpm to obtain a sodium dodecyl sulfate solution, and take it out; then take 0.5 parts of carboxymethyl cellulose and add it to 100 parts of water. Adjust the inner shaft 1 to drive the stirring blade 42 to stir at a speed of 200 rpm - 400 rpm to obtain a carboxymethyl cellulose solution, and take it out.

[0047] S2. Add 30 parts of fly ash and 20 parts of cement into the mixing container, adjust the inner shaft 1 to drive the multi-layer variable-angle staggered mixing blades 42 to mix thoroughly for 3 min - 5 min (dry mixing) at a speed of 500 rpm; then add water into the mixing container according to a water-cement ratio of 0.3, adjust the inner shaft 1 to drive the mixing blades 42 to rotate at a speed of 1000 rmp, and at the same time start the vibrating plate 3 on the outer shaft 2 to stir the materials in the mixing container for 2 min until the slurry is uniform, forming a fire prevention and extinguishing matrix solution ("fly ash + cement" solution).

[0048] S3: Add the sodium dodecyl sulfate solution and the carboxymethyl cellulose solution into the mixing container to mix with the fire prevention and extinguishing matrix solution ("fly ash + cement" solution), adopt the "intermittent vibration" mode, keep the inner shaft speed at 1000 rmp, drive multiple mixing blades 42 to stir the materials, start the vibrating plate 3 to apply a 150 Hz high-frequency vibration impact (amplitude 1 mm) once every 30 seconds; at the same time start the gas injection assembly 5 to inject carbon dioxide or nitrogen into the mixing container at a speed of 0.2 mL / min and a gas pressure of 1.8 MPa until a pore structure is formed, that is, a microporous structure is formed, and stop stirring.

[0049] S4. Stirring effect evaluation: Extract samples from the mixed materials and conduct characterization parameter tests. When the characterization parameters are less than the preset values (that is, evaluated by the sample foaming multiple and the sample setting time: the sample foaming multiple is 4 - 10 times; use relevant instruments (such as a Vicat apparatus) to detect that the sample setting time is within the range of 2 hours - 3 hours, and for some high-performance products, the setting time can be adjusted according to the actual mixed materials), return to step S3, adjust parameters such as the stirring mode, the speed of the inner shaft 1, the vibration frequency and amplitude of the vibrating plate, and the flow rate and pressure of carbon dioxide or nitrogen, continue to stir for a period of time, and conduct characterization parameter tests again to further optimize the stability and fire prevention performance of the foam material until the characterization parameters of the formed materials are greater than or equal to the preset values, and complete the stirring.

[0050] Furthermore, the following structural optimizations are also carried out for this device: Such as Figure 1As shown, specifically, a self-cleaning system and a high-pressure spraying system are added inside the stirring container. The self-cleaning system includes the following components: Telescopic scraper 8 assembly: A retractable scraper 8 is added at the top of the multi-layer variable-angle staggered stirring blade 42 system. The scraper 8 is made of wear-resistant silicon carbide composite material. The scraper 8 is fixed on the cover plate of the stirring container. The cover plate is sleeved on the rotating cylinder, and the cover plate is driven by the rotating cylinder to rotate, so as to realize the rotation of the scraper, which is convenient for cleaning the materials on the side wall of the stirring container. The surface of the scraper 8 is provided with fractal bionic patterns, which can adapt to the curvature of the inner wall of the stirring tank. When the scraper 8 is unfolded, the distance from the inner wall and the bottom of the tank is 0.5 mm - 1 mm. The high-pressure spraying system can include an annular spray pipe arranged at the inlet of the stirring container. The spray pipe is arranged inside the cover plate of the stirring container and fixed to it. The spray pipe is connected to an external water tank through a water pipe and a pump body. The water tank is filled with cleaning liquid. Multiple groups (preferably 36 groups are arranged in a circumferential array) of adjustable-angle nozzles are evenly distributed on the spray pipe. The nozzle aperture is 0.3 mm - 1.2 mm, and the adjustable range of the spraying pressure is 0.5 MPa - 5 MPa. The cleaning liquid is deionized water or a liquid containing surfactant. At the same time, a cleaning control module is set on the control system 6: A "self-cleaning mode" is added to the control panel, which supports digital setting of the movement track of the scraper 8, the spraying pressure and the cleaning duration, and is linked with the stirring shaft speed and the vibration mode. In addition, as Figure 5 shown, preferably, the water tank can also be directly integrated on the rotating cylinder, arranged at the mouth of the stirring container, and rotates together with the rotating cylinder. Then, multiple adjustable-angle nozzles and multiple telescopic scrapers 8 are arranged in a circumferential array on the water tank, which is convenient for cleaning the stirring container after stirring is completed.

[0051] Integration of self-cleaning process Couple the self-cleaning system with the existing stirring process. The specific steps are as follows: Stirring stage: During the conventional stirring process, the scraper 8 is in a retracted state to avoid interfering with the material mixing; when it is detected that the stirring torque fluctuation exceeds the threshold (±15%), the control panel automatically triggers the intermittent scraping mode, and the scraper 8 is periodically unfolded at a frequency of 0.5 Hz to remove the attachments on the stirring blade 42 and the tank wall. Cleaning stage: After stirring is completed, switch to the "self-cleaning mode": The inner shaft 1 is decelerated to 200 rpm, and the outer shaft 2 vibrates at a low frequency of 20 Hz (amplitude 0.2 mm), driving the scraper 8 to spiral down along the inner wall of the tank; simultaneously start the high-pressure spraying system, spray the cleaning liquid at a pressure of 3 MPa, and the spraying flow rate is dynamically matched with the movement speed of the scraper 8 (flow rate = 0.1 × linear speed of the scraper 8); the cleaning liquid is recycled after being filtered through the bottom recovery pipeline, and the residues are automatically discharged through the centrifugal separation module.

[0052] Effect verification To evaluate the cleaning effect of the stirring container, a comparative test was conducted on the stirring container before and after cleaning. The test used a laser scanner to accurately measure the thickness of the residues on the inner wall of the cavity. The results showed that the optimized stirring system could significantly reduce the residue amount, thereby improving the cleaning efficiency. In addition, by adopting the scraper 8 with a bionic texture design, not only the friction loss was effectively reduced, but also the service life of the stirring blade 42 assembly was significantly extended.

[0053] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A stirring device for preparing a fire prevention and extinguishing foaming material, comprising a stirring container and a power output unit. The power output unit has an inner shaft (1) inserted into the stirring container. The inner shaft (1) is a hollow tube body, and is characterized in that, Further comprising: A vibration assembly disposed within the stirring container, the vibration assembly including a plurality of outer shafts (2) and vibration plates (3). The plurality of outer shafts (2) are circumferentially arrayed on the periphery of the inner shaft (1). The upper end of each outer shaft (2) is rotatably connected to the inner shaft (1). A plurality of vibration plates (3) are mounted on each outer shaft (2). The vibration assembly is configured to generate vibration impacts within the stirring container to act on the material. A stirring assembly (4) disposed within the stirring container, including a plurality of hollow drive wheels (41) fixedly sleeved on the inner shaft (1) at intervals. A plurality of obliquely disposed hollow stirring blades (42) are arranged on the periphery of the drive wheels (41). The inclination angles of adjacent two stirring blades (42) are different. The hollow cavities of the stirring blades (42), the drive wheels (41), and the inner shaft (1) are in communication. And a plurality of air holes (43) are formed in the stirring blades (42). A gas injection assembly (5) whose input end is in communication with the inner shaft (1), configured to input carbon dioxide or nitrogen into the stirring container through the air holes (43) on the stirring blades (42).

2. The stirring device for preparing the fire prevention and extinguishing foaming material according to claim 1, characterized in that, A micro piezoelectric film is embedded in the air hole (43). A through hole coaxial with the air hole (43) is provided on the micro piezoelectric film. The micro piezoelectric film is electrically connected to a control system (6). The control system (6) is configured to regulate the voltage applied to the micro piezoelectric film.

3. The stirring device for preparing the fire prevention and extinguishing foaming material according to claim 2, characterized in that, The dynamic adjustment range of the micro piezoelectric film is 0.1 mm to 2 mm.

4. The stirring device for preparing the fire prevention and extinguishing foaming material according to claim 2, characterized in that, The vibration plate (3) is electrically connected to the control system (6). The frequency of the vibration plate (3) is 50 Hz to 200 Hz, and the amplitude is 0.1 mm to 1 mm.

5. The stirring device for preparing the fire prevention and extinguishing foaming material according to claim 1, characterized in that, The inclination angle of the stirring blade (42) is 10° to 30°, and the inclination angles of the plurality of stirring blades (42) vary in a gradient along the axial direction of the drive wheel (41).

6. The stirring device for preparing the fire prevention and extinguishing foaming material according to claim 1, characterized in that, The aperture of the air hole (43) is 0.5 mm to 3 mm.

7. The stirring device for preparing the fire prevention and extinguishing foaming material according to claim 6, characterized in that, The plurality of air holes (43) on the stirring blade (42) are arranged at equal intervals along the curve direction of the stirring blade (42). And the apertures of the plurality of air holes (43) gradually decrease from the side close to the inner shaft (1) to the side far from the inner shaft (1).

8. A stirring device for preparing a fire prevention and extinguishing foaming material according to claim 6, characterized in that, The plurality of air holes (43) on the stirring blade (42) are distributed in a honeycomb shape, and the plurality of air holes (43) expand from the center of the stirring blade (42) to the periphery in a scaling ratio of 0.5 to 0.

9.

9. The stirring device for preparing the fire prevention and extinguishing foaming material according to claim 1, characterized in that, The gas injection assembly (5) includes a gas delivery pipeline (51), a gas storage tank (52), and a fluid control module. One end of the gas delivery pipeline (51) is connected to the gas storage unit, and the other end is in communication with the cavity of the inner shaft (1). The fluid control module is disposed on the gas delivery pipeline (51), and the fluid control module includes a switch valve (53), a digital pressure monitor (54), and a flow monitor (55) sequentially arranged on the gas delivery pipeline (51).

10. The usage method of a stirring device for preparing a fire prevention and extinguishing foaming material according to any one of claims 1-9, characterized in that, Including the following steps: S1. Put the mine fire prevention and extinguishing foaming base material and water into the stirring container, control the inner shaft (1) to drive the stirring blades (42) to stir the fire prevention and extinguishing foaming base material and water at a speed of 800 rpm to 1000 rpm, so that the fire prevention and extinguishing foaming base material and water are evenly mixed to form a fire prevention and extinguishing foaming solution, and then take it out; S2. First add the fire prevention and extinguishing base material to the stirring container, adjust the inner shaft (1) to drive the stirring blades (42) to carry out dry mixing and stirring of the fire prevention and extinguishing aggregate at a speed of 200 rpm to 500 rpm. After the dry mixing and stirring is completed, add water to the stirring container, adjust the inner shaft (1) to drive the stirring blades (42) to rotate at a speed of 1000 rpm to 1500 rpm, and at the same time start the vibrating piece (3) on the outer shaft (2) to apply vibration to the materials in the stirring container, and stir evenly to form a fire prevention and extinguishing matrix solution, and then take it out; S3. First put the fire prevention and extinguishing foaming solution into the stirring container, keep the rotation speed of the inner shaft (1) at 1000 rpm to 1500 rpm and the vibration of the vibrating piece (3) to start stirring the fire prevention and extinguishing foaming solution. During the stirring process, gradually inject the fire prevention and extinguishing matrix solution, and at the same time start the gas injection component (5) to inject carbon dioxide or nitrogen into the stirring container at a flow rate of 0.1 mL / min to 0.5 mL / min, and adjust the gas pressure to 0.5 MPa to 3 MPa until the fire prevention and extinguishing foaming solution and the fire prevention and extinguishing gel matrix solution are mixed to form a pore structure; S4. Extract samples from the mixed materials for characterization parameter testing. When the test result of the characterization parameter is less than the preset value, return to step S3, adjust the rotation speed of the inner shaft (1), the vibration parameters of the vibrating piece (3), and the flow rate and pressure of carbon dioxide or nitrogen, repeat stirring for a period of time, and conduct characterization parameter testing on the materials again until the characterization parameter value of the materials is greater than or equal to the preset value to complete the stirring.

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