High-efficiency and environment-friendly spray dust-removal system in coal mine

Abstract

The application discloses a coal mine underground high-efficiency environment-friendly spray dust removal system, which comprises a liquid storage tank containing environment-friendly dust fall agent, a water pump is arranged on the top of the liquid storage tank, a high-pressure pipeline is connected to the outlet of the water pump, a plurality of movable nozzle assemblies are arranged on the high-pressure pipeline, a plurality of through holes are arranged on the bottom of the high-pressure pipeline along the water flow direction, a water pressure valve for closing the through holes is arranged in the high-pressure pipeline, and the movable nozzle assemblies are moved to the positions of the through holes and open the through holes by pressing the water pressure valves to spray. The sliding sleeve is arranged to realize the movement of the whole spray dust removal device along the high-pressure pipeline, change the spray dust removal position and perform the spray operation, so that the dust removal of some areas can be emphasized without affecting the operation of the whole pipeline. The dust fall agent sprayed by the nozzle can quickly inhibit and diffuse the coal dust generated in the coal mine underground roadway and working face, and the application has good application prospect and popularization value.

Description

Technical Field

[0001] This invention belongs to the technical field of modern equipment manufacturing industry, specifically relating to a high-efficiency and environmentally friendly spray dust removal system for underground coal mines. Background Technology

[0002] The following documents disclose spray dust suppression devices for coal mine roadways and working faces: 1) Publication No. CN111042854 A discloses a dust suppression device for underground coal mines; 2) Publication No. CN105888717 A discloses a spray dust suppression device; 3) Publication No. CN 107587892 B discloses a fine atomized foam dust suppression device for suppressing dust in underground coal mines. The nozzles disclosed in these documents are all fixedly installed on pipelines. Since the dust-generating areas differ during actual coal production, the focus of dust suppression varies. However, using ordinary nozzles on a single pipeline can only achieve dust suppression with the same efficiency over a large area, failing to target specific dust-generating areas or areas requiring focused dust suppression. Laying another pipeline would significantly increase costs, resulting in a mismatch between consumption and output. However, adding a mobile spray device to a single pipeline can solve this problem at a lower cost.

[0003] Currently, coal mine dust control technologies mainly include ventilation and dust removal, closed-loop dust control, spray dust suppression, dust suppressants, dust collectors, and curtain dust isolation. Among these, spray dust suppression, as a safe and efficient dust control technology, has been widely researched and applied in many coal mines in recent years. However, spray dust suppression typically uses clean water, which has poor dust removal efficiency. While some use sprayed dust suppressants, existing dust suppressants suffer from poor environmental adaptability, cumbersome preparation procedures, high costs, and secondary pollution, limiting their widespread use. Therefore, there is an urgent need to develop an environmentally friendly dust suppressant to improve the effectiveness of spray dust suppression in underground coal mines. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems in the prior art, the present invention provides a high-efficiency and environmentally friendly spray dust removal system for underground coal mines, which is installed on a pipeline and can be moved and adjusted according to the dust generation location, uses environmentally friendly dust suppressant for spray dust removal, and greatly improves the spray dust removal effect.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a high-efficiency and environmentally friendly underground spray dust suppression system for coal mines, including a storage tank containing an environmentally friendly dust suppressant, a water pump at the top of the storage tank, a water pump inlet connected to a water pump pipe extending into the storage tank and arranged along the inner wall of the storage tank, a high-pressure pipeline connected to the water pump outlet, a number of movable nozzle assemblies installed on the high-pressure pipeline, the water flow direction in the high-pressure pipeline being from front to back, a number of through holes opened at the bottom of the high-pressure pipeline along the water flow direction, a water pressure valve for sealing the through holes inside the high-pressure pipeline, and the movable nozzle assembly moving to the through hole position and opening the through hole through the top pressure water pressure valve to spray.

[0006] The hydraulic valve includes a valve plate with a stepped hole that is larger inside and smaller outside. The valve plate has a convex structure that matches the stepped hole. The front side of the valve plate is rotatably connected to the inner wall of the high-pressure pipeline via a hinge. The bottom surface of the valve plate is provided with a sealing gasket that fits with the stepped surface of the through hole. The top surface of the valve plate is integrally provided with a water-facing wedge, and the top surface of the water-facing wedge is a water-facing surface that is lower in the front and higher in the back.

[0007] The movable nozzle assembly includes a sliding sleeve, an internally threaded sleeve, and a nozzle. The sliding sleeve is slidably connected to the high-pressure pipeline. The upper end of the internally threaded sleeve is fixedly connected to the bottom of the sliding sleeve. The center line of the internally threaded sleeve is perpendicular to the center line of the sliding sleeve and is internally connected. The upper outer circle of the nozzle is cylindrical, and the lower outer circle of the nozzle is conical. The upper outer circle of the nozzle is threadedly connected to the inner circle of the internally threaded sleeve through a sealing pipe thread structure. A water inlet is provided at the center of the upper end of the nozzle. A top ring for pressing the bottom surface of the pressure valve plate is provided outside the water inlet at the upper end of the internally threaded sleeve. An atomizing spray hole is provided at the lower end of the nozzle. A limiting ring is provided on the inner circle of the lower end of the internally threaded sleeve.

[0008] The nozzle top surface is provided with a rubber sealing seat that fits outside the top ring. The top surface of the rubber sealing seat is provided with an arc groove that matches the arc surface at the bottom of the high-pressure pipeline. The upper part of the inner circle of the internal threaded sleeve is provided with a guide bar parallel to the center line of the internal threaded sleeve. The outer circle of the rubber sealing seat is provided with a guide groove that cooperates with and slides with the guide bar.

[0009] A stirring motor is located at the center of the top of the storage tank. The main shaft of the stirring motor is vertically downward and coaxially connected to a stirring shaft that extends into the storage tank. Several stirring blades are installed on the stirring shaft. A liquid inlet is located on one side of the top of the storage tank. A pressure gauge, flow meter and regulating valve are installed on the high-pressure pipeline near the water pump.

[0010] The dust suppressant is formulated from peanut shell cellulose and a surfactant; the surfactant is one or more of tea saponins, sucrose esters, soapberry extract, and lipopeptides; the preparation method of the dust suppressant includes the following steps:

[0011] (1) Preparation of materials: Select fresh, dry, and impurity-free peanut shells as raw materials;

[0012] (2) Wash the peanut shells to remove surface dust and impurities, dry them, and then crush them to make the particle size appropriate for subsequent processing.

[0013] (3) Pretreatment: to improve cellulose extraction efficiency;

[0014] (4) Enzymatic hydrolysis: The pretreated peanut shell particles were degraded by a combination of cellulase and protease.

[0015] (5) Filtration and centrifugation: After enzymatic hydrolysis, the solid and liquid are separated by filtration; the solid part is the extracted peanut shell cellulose.

[0016] (6) Peanut shell cellulose and surfactant are compounded to obtain a dust suppressant.

[0017] The specific process of pretreatment in step (3) is as follows: Soak peanut shell particles in a 4% tea saponin solution and a 6% sucrose ester solution for 30-50 minutes at a solid-liquid mass ratio of 1:15. Then add a 2.3% phosphate buffer solution. After the buffer has fully reacted with the peanut shells, filter and collect the particles. Wash with distilled water until the pH of the peanut shell particles reaches 6.8-7.0 and allow them to air dry. After air drying, place the peanut shell particles in a 1.7% ethanol solution at a solid-liquid mass ratio of 1:12. Then add a 1.7% sodium chloride solution and stir and mix in a 50℃ constant temperature water bath for 50-70 minutes to ensure the extract fully reacts with the peanut shell particles and improves the enzyme extraction efficiency.

[0018] The specific process of enzymatic hydrolysis in step (4) is as follows: collect the pretreated peanut shell particles and wash them with distilled water until the pH reaches 7.0. After air drying, place them in a 0.4% (w / w) cellulase solution and a 0.4% (w / w) cucurbitacin solution. Select an acetate-sodium acetate buffer solution with a mass concentration of 0.2% (w / w) to facilitate enzyme stability. Add an acetate-ammonium acetate buffer solution with a mass concentration of 0.3-0.5% (w / w) to the above mixed solution to adjust the pH to 5.8-6.0. Then place the solution in a constant temperature water bath at 48-50℃ and stir thoroughly for 2.0-2.5 hours to achieve the effect of dual enzyme degradation of peanut shells by cellulase and protease. During the enzymatic hydrolysis process, cellulase assists protease in removing proteins, thereby improving the protein hydrolysis rate and product purity.

[0019] Step (5) is as follows: Take the enzymatically hydrolyzed solution and pour it into a centrifuge tube for centrifugation. Centrifuge 3 times at a speed of 10000~12000r / min. Then add 0.2% ethanol washing solvent to the centrifuge tube and gently shake or stir to make the precipitate fully contact the washing solvent. Then let it stand for 10 minutes and take out the precipitate at the bottom of the centrifuge tube. Transfer the precipitate to a dry container and place it for 2 hours before taking it out to obtain peanut shell cellulose.

[0020] The specific process of step (6) is as follows: the extracted peanut shell cellulose is added to distilled water at a solid-liquid ratio of 1:10 and mixed with one or more of tea saponin, sucrose ester, soapberry and lipopeptide at a mass concentration of 0.05~0.07% to finally obtain an environmentally friendly coal mine dust suppressant.

[0021] Compared with the prior art, the movable nozzle assembly of the present invention, using the above technical solution, differs significantly from the ordinary nozzle structure, mainly in the following aspects:

[0022] (1) Different mechanical structures. The nozzle used in this invention is separate from the sliding sleeve and internal threaded sleeve that move. The sliding sleeve can move arbitrarily on the pipeline; ordinary nozzles usually cannot move on the pipeline.

[0023] (2) Different usage scenarios. The movable nozzle assembly can perform targeted dust removal on a certain part or area without adding nozzles or replacing pipes, depending on the dust removal focus required; ordinary nozzles can only remove dust from fixed areas.

[0024] (3) Different usage methods. The movable nozzle assembly moves on the high-pressure pipeline. By screwing in the nozzle, the internal top ring opens the valve plate below the pipeline to perform spraying. After the spraying is finished, the nozzle can be rotated downwards, the top ring disengages from the through hole, and the valve plate closes due to the impact of the water flow. The movable nozzle assembly can then be moved to another through hole to perform spraying.

[0025] The present invention has the following technical effects:

[0026] 1) Water flows from front to back in the high-pressure pipeline. The water pressure inside the high-pressure pipeline is applied to the valve plate, causing the sealing gasket on the valve plate to press tightly against the stepped surface of the through hole, thereby sealing the through hole. The water-facing wedge on the top surface of the valve plate further enhances the sealing performance of the valve plate to the through hole by the radial pressure exerted by the water flow on the water-facing surface of the wedge, ensuring that no dust suppressant leaks from the through hole where dust suppression spray is not applied.

[0027] 2) As the top ring at the upper end of the nozzle pushes the valve plate upwards, the rubber sealing seat moves upwards without rotating until the arc-shaped groove at the top of the rubber sealing seat presses against the arc surface at the bottom of the high-pressure pipeline, sealing the through hole. The outer circle of the upper part of the nozzle is connected to the inner circle of the internal threaded sleeve through a sealing pipe thread structure, providing a good sealing effect. This ensures that the high-pressure dust suppressant in the high-pressure pipeline does not leak and can only be sprayed out through the atomizing nozzle at the lower end of the nozzle.

[0028] 3) The limiting ring prevents the nozzle from unscrewing downwards out of the internal threaded sleeve.

[0029] 4) The top ring not only pushes the valve plate upward, but also extends into the through hole to limit the position of the entire spray dust suppression device on the high-pressure pipeline (it cannot rotate or move axially).

[0030] 5) This invention extracts cellulose from peanut shells using an enzymatic method and combines it with surfactants such as bio-type tea saponin, sucrose esters, soapberry, and lipopeptides to prepare an environmentally friendly coal mine dust suppressant. The preparation process of the environmentally friendly coal mine dust suppressant is simple, easy to operate, and has low raw material costs. After being sprayed for dust suppression, it is biodegradable and causes no secondary pollution.

[0031] The principle behind environmentally friendly dust suppressants for coal dust suppression is as follows: Environmentally friendly dust suppressants achieve efficient dust suppression through mechanisms such as adhesion and agglomeration, and alteration of the surface properties of the water used in spray dust suppression. The high molecular weight segments of cellulose in the dust suppressant can form chemical bonds or undergo physical adsorption with the surface of dust particles, thereby firmly binding the dust particles together and effectively agglomerating the dust. Simultaneously, the environmentally friendly dust suppressant has good wettability, which reduces the surface tension of the aqueous solution, allowing it to quickly contact and cover the surface of dust particles. The dust then settles under gravity, achieving the purpose of dust suppression.

[0032] In summary, this invention utilizes the characteristic that valve plates evenly distributed below the pipeline automatically close after the top ring retracts due to water flow impact. It employs a threaded rotating nozzle that moves up and down to control the nozzle's opening and closing. By incorporating a sliding sleeve, the entire movable nozzle assembly can move back and forth along the high-pressure pipeline to change the spraying position for dust suppression, thus allowing for targeted dust suppression in specific areas without affecting the overall pipeline operation. The dust suppressant sprayed from the nozzle rapidly suppresses and disperses coal dust generated in underground mine roadways and working faces, demonstrating promising application prospects and significant potential for widespread adoption. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 yes Figure 1 Enlarged view of the movable nozzle assembly mounted on the high-pressure pipeline;

[0035] Figure 3 This is a structural diagram of the movable nozzle assembly;

[0036] Figure 4 This is a schematic diagram of the structure of a hydraulic valve when it seals the through hole;

[0037] Figure 5 yes Figure 4 Top view of the through hole after removing the water pressure valve;

[0038] Figure 6 This is a schematic diagram of the structure when the top ring pushes open the through hole of the water pressure valve. Detailed Implementation

[0039] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0040] like Figures 1-6 As shown, the high-efficiency and environmentally friendly underground spray dust suppression system of the present invention includes a storage tank 19 containing a dust suppressant. A water pump 20 is provided at the top of the storage tank 19. The inlet of the water pump 20 is connected to a water pumping pipe 21 that extends into the storage tank 19 and is arranged along the inner wall of the storage tank 19. The outlet of the water pump 20 is connected to a high-pressure pipeline 1. Several movable nozzle assemblies 22 are provided on the high-pressure pipeline 1. The water flow direction in the high-pressure pipeline 1 is from front to back. Several through holes 2 are opened at the bottom of the high-pressure pipeline 1 along the water flow direction. A water pressure valve for closing the through holes 2 is provided inside the high-pressure pipeline 1. The movable nozzle assembly 22 moves to the position of the through hole 2 and opens the through hole 2 through the top pressure water pressure valve to spray.

[0041] A stirring motor 23 is installed at the center of the top of the storage tank 19. The main shaft of the stirring motor 23 is vertically downward and coaxially connected to a stirring shaft 24 that extends into the storage tank 19. Several stirring blades 25 are installed on the stirring shaft 24. A liquid inlet 26 is provided on one side of the top of the storage tank 19. A pressure gauge 27, a flow meter 28 and a regulating valve 29 are provided on the high-pressure pipeline 1, which is close to the water pump 20.

[0042] The hydraulic valve includes a valve plate 3, a through hole 2 which is a stepped hole with a larger inner diameter and a smaller outer diameter, a convex structure that matches the stepped hole, and a hinge 4 that rotatably connects the front side of the valve plate 3 to the inner wall of the high-pressure pipeline 1. The bottom surface of the valve plate 3 is provided with a sealing gasket 5 that fits against the stepped surface 16 of the through hole 2.

[0043] The valve plate 3 has an integral water-facing wedge 6 on its top surface, and the top surface of the water-facing wedge 6 is a water-facing surface that is lower in the front and higher in the back.

[0044] The movable nozzle assembly 22 includes a sliding sleeve 7, an internally threaded sleeve 8, and a nozzle 9. The sliding sleeve 7 is slidably connected to the high-pressure pipeline 1. The upper end of the internally threaded sleeve 8 is fixedly connected to the bottom of the sliding sleeve 7. The center line of the internally threaded sleeve 8 is perpendicular to the center line of the sliding sleeve 7 and is internally connected. The upper outer circle of the nozzle 9 is cylindrical, and the lower outer circle of the nozzle 9 is conical. The upper outer circle of the nozzle 9 is threadedly connected to the inner circle of the internally threaded sleeve 8 through a sealing pipe thread structure 18. A water inlet 17 is provided at the center of the upper end of the nozzle 9. A top ring 10 for the bottom surface of the pressure valve plate 3 is provided outside the water inlet 17 at the upper end of the internally threaded sleeve 8. An atomizing spray hole 11 is provided at the lower end of the nozzle 9.

[0045] The inner circle at the lower end of the internally threaded sleeve 8 is provided with a limiting ring 12.

[0046] The top surface of the nozzle 9 is provided with a rubber sealing seat 13 that fits outside the top ring 10. The top surface of the rubber sealing seat 13 is provided with an arc groove 14 that matches the bottom arc surface of the high pressure pipeline 1. The upper part of the inner circle of the internal threaded sleeve 8 is provided with a guide bar 15 that is parallel to the center line of the internal threaded sleeve 8. The outer circle of the rubber sealing seat 13 is provided with a guide groove that cooperates with and slides with the guide bar 15.

[0047] Dust suppressant is injected into the storage tank 19 through the inlet 26 at the top. To ensure more uniform mixing of the dust suppressant within the storage tank 19, the stirring motor 23 is simultaneously activated while the water pump 20 is operating. The stirring motor 23 drives the stirring shaft 24 to rotate, and the stirring blades 25 on the stirring shaft 24 stir the dust suppressant within the storage tank 19. The water pump 20 draws the dust suppressant from the storage tank 19 into a high-pressure pipeline through the pumping pipe 21. The pressure gauge 27 monitors the pressure of the dust suppressant in the high-pressure pipeline, the flow meter 28 monitors the injection volume of the dust suppressant, and the regulating valve 29 regulates the flow rate and pressure of the dust suppressant delivered to the movable nozzle assembly 22.

[0048] The dust suppressant is formulated from peanut shell cellulose and a surfactant; the surfactant is one or more of tea saponins, sucrose esters, soapberry extract, and lipopeptides; the preparation method of the dust suppressant includes the following steps:

[0049] (1) Preparation of materials: Select fresh, dry, and impurity-free peanut shells as raw materials;

[0050] (2) Wash the peanut shells to remove surface dust and impurities, dry them, and then crush them to make the particle size appropriate for subsequent processing.

[0051] (3) Pretreatment: to improve cellulose extraction efficiency;

[0052] (4) Enzymatic hydrolysis: The pretreated peanut shell particles were degraded by a combination of cellulase and protease.

[0053] (5) Filtration and centrifugation: After enzymatic hydrolysis, the solid and liquid are separated by filtration; the solid part is the extracted peanut shell cellulose.

[0054] (6) Peanut shell cellulose and surfactant are compounded to obtain a dust suppressant.

[0055] The specific process of pretreatment in step (3) is as follows: Soak peanut shell particles in a 4% tea saponin solution and a 6% sucrose ester solution for 30-50 minutes at a solid-liquid mass ratio of 1:15. Then add a 2.3% phosphate buffer solution. After the buffer has fully reacted with the peanut shells, filter and collect the particles. Wash with distilled water until the pH of the peanut shell particles reaches 6.8-7.0 and allow them to air dry. After air drying, place the peanut shell particles in a 1.7% ethanol solution at a solid-liquid mass ratio of 1:12. Then add a 1.7% sodium chloride solution and stir and mix in a 50℃ constant temperature water bath for 50-70 minutes to ensure the extract fully reacts with the peanut shell particles and improves the enzyme extraction efficiency.

[0056] The specific process of enzymatic hydrolysis in step (4) is as follows: collect the pretreated peanut shell particles and wash them with distilled water until the pH reaches 7.0. After air drying, place them in a 0.4% (w / w) cellulase solution and a 0.4% (w / w) cucurbitacin solution. Select an acetate-sodium acetate buffer solution with a mass concentration of 0.2% (w / w) to facilitate enzyme stability. Add an acetate-ammonium acetate buffer solution with a mass concentration of 0.3-0.5% (w / w) to the above mixed solution to adjust the pH to 5.8-6.0. Then place the solution in a constant temperature water bath at 48-50℃ and stir thoroughly for 2.0-2.5 hours to achieve the effect of dual enzyme degradation of peanut shells by cellulase and protease. During the enzymatic hydrolysis process, cellulase assists protease in removing proteins, thereby improving the protein hydrolysis rate and product purity.

[0057] Step (5) is as follows: Take the enzymatically hydrolyzed solution and pour it into a centrifuge tube for centrifugation. Centrifuge 3 times at a speed of 10000~12000r / min. Then add 0.2% ethanol washing solvent to the centrifuge tube and gently shake or stir to make the precipitate fully contact the washing solvent. Then let it stand for 10 minutes and take out the precipitate at the bottom of the centrifuge tube. Transfer the precipitate to a dry container and place it for 2 hours before taking it out to obtain peanut shell cellulose.

[0058] The specific process of step (6) is as follows: the extracted peanut shell cellulose is added to distilled water at a solid-liquid ratio of 1:10 and mixed with one or more of tea saponin, sucrose ester, soapberry and lipopeptide at a mass concentration of 0.05~0.07% to finally obtain an environmentally friendly coal mine dust suppressant.

[0059] When the present invention is in operation, the water pump 20 supplies the dust suppressant solution prepared in the storage tank 19 to the high-pressure pipeline 1. The movable nozzle assembly 22 is moved along the high-pressure pipeline 1 to the position of the through hole 2, so that the upper end of the internal threaded sleeve 8 of the movable nozzle assembly 22 corresponds to the through hole 2. Then the nozzle 9 is rotated so that the nozzle 9 moves upward in the internal threaded sleeve 8. During the upward movement, the upper end of the top ring 10 presses against the bottom surface of the valve plate 3. After the valve plate 3 is subjected to the pressure, it rotates upward around the hinge 4, and the through hole 2 is opened. The nozzle 9 (rotating) drives the rubber sealing seat 13 (not rotating) to move upward along the guide strip 15 until the sealing rubber seat on the upper end of the nozzle 9 is pressed against the bottom of the high-pressure pipeline 1 (sealing the through hole 2). Then the rotation of the nozzle 9 stops. The high-pressure water in the high-pressure pipeline 1 enters the nozzle 9 through the through hole 2, the top ring 10 and the water inlet 17 at the upper end of the nozzle 9, and finally sprays out from the atomizing nozzle hole 11 at the lower end of the nozzle 9. When a certain area requires increased spray dust suppression, the movable nozzle assembly 22 from other areas not requiring dust suppression can be moved to the through-hole 2 in the area requiring spraying. This saves on dust suppressant while concentrating greater water pressure and spray volume to suppress dust in areas with higher dust generation. The principle of environmentally friendly dust suppressants for coal dust suppression is as follows: Environmentally friendly dust suppressants achieve efficient dust suppression through mechanisms such as bonding and agglomeration, and altering the surface properties of the water used for spray dust suppression. The high molecular weight segments of cellulose in the dust suppressant can form chemical bonds or physical adsorption with the surface of dust particles, thereby firmly binding the dust particles together and effectively agglomerating the dust. At the same time, environmentally friendly dust suppressants have good wettability, which can reduce the surface tension of the aqueous solution, quickly contact and cover the surface of dust particles, and the dust settles under gravity, achieving the purpose of dust suppression.

[0060] The above embodiments illustrate the basic principles and features of the present invention, but are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by the present invention, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the scope of protection of the present invention. Therefore, the patent and scope of protection of this invention should be determined by the appended claims.

Claims

1. A high-efficiency and environmentally friendly underground spray dust suppression system for coal mines, characterized in that: It includes a storage tank containing an environmentally friendly dust suppressant. A water pump is installed on the top of the storage tank. The inlet of the water pump is connected to a water pipe that extends into the storage tank and runs along the inner wall of the storage tank. The outlet of the water pump is connected to a high-pressure pipeline. Several movable nozzle assemblies are installed on the high-pressure pipeline. The water flow direction in the high-pressure pipeline is from front to back. Several through holes are opened at the bottom of the high-pressure pipeline along the water flow direction. A water pressure valve for closing the through holes is installed inside the high-pressure pipeline. The movable nozzle assembly moves to the through hole position and opens the through hole through the top water pressure valve to spray. The hydraulic valve includes a valve plate with a stepped hole that is larger inside and smaller outside. The valve plate has a convex structure that matches the stepped hole. The front side of the valve plate is rotatably connected to the inner wall of the high-pressure pipeline via a hinge. The bottom surface of the valve plate is provided with a sealing gasket that fits with the stepped surface of the through hole. The top surface of the valve plate is integrally provided with a water-facing wedge, and the top surface of the water-facing wedge is a water-facing surface that is lower at the front and higher at the back. The movable nozzle assembly includes a sliding sleeve, an internally threaded sleeve, and a nozzle. The sliding sleeve is slidably connected to the high-pressure pipeline. The upper end of the internally threaded sleeve is fixedly connected to the bottom of the sliding sleeve. The center line of the internally threaded sleeve is perpendicular to the center line of the sliding sleeve and is internally connected. The upper outer circle of the nozzle is cylindrical, and the lower outer circle of the nozzle is conical. The upper outer circle of the nozzle is threadedly connected to the inner circle of the internally threaded sleeve through a sealing pipe thread structure. A water inlet is provided at the center of the upper end of the nozzle. A top ring for pressing the bottom surface of the pressure valve plate is provided outside the water inlet at the upper end of the internally threaded sleeve. An atomizing spray hole is provided at the lower end of the nozzle. A limiting ring is provided on the inner circle of the lower end of the internally threaded sleeve.

2. The high-efficiency and environmentally friendly underground spray dust suppression system for coal mines according to claim 1, characterized in that: The nozzle top surface is provided with a rubber sealing seat that fits outside the top ring. The top surface of the rubber sealing seat is provided with an arc groove that matches the arc surface at the bottom of the high-pressure pipeline. The upper part of the inner circle of the internal threaded sleeve is provided with a guide bar parallel to the center line of the internal threaded sleeve. The outer circle of the rubber sealing seat is provided with a guide groove that cooperates with and slides with the guide bar.

3. The high-efficiency and environmentally friendly underground spray dust suppression system for coal mines according to claim 1, characterized in that: A stirring motor is located at the center of the top of the storage tank. The main shaft of the stirring motor is vertically downward and coaxially connected to a stirring shaft that extends into the storage tank. Several stirring blades are installed on the stirring shaft. An inlet is located on one side of the top of the storage tank. A pressure gauge, flow meter and regulating valve are installed on the high-pressure pipeline near the water pump.

4. The high-efficiency and environmentally friendly underground spray dust suppression system for coal mines according to any one of claims 1-3, characterized in that: The dust suppressant is formulated from peanut shell cellulose and a surfactant; the surfactant is one or more of tea saponins, sucrose esters, soapberry extract, and lipopeptides; the preparation method of the dust suppressant includes the following steps: (1) Preparation of materials: Select fresh, dry, and impurity-free peanut shells as raw materials; (2) Wash the peanut shells to remove surface dust and impurities, dry them, and then crush them to make the particle size appropriate for subsequent processing. (3) Pretreatment: to improve cellulose extraction efficiency; (4) Enzymatic hydrolysis: The pretreated peanut shell particles were degraded by a combination of cellulase and protease. (5) Filtration and centrifugation: After enzymatic hydrolysis, the solid and liquid are separated by filtration; the solid part is the extracted peanut shell cellulose. (6) Peanut shell cellulose and surfactant are compounded to obtain a dust suppressant.

5. The high-efficiency and environmentally friendly underground spray dust suppression system for coal mines according to claim 4, characterized in that: The specific process of pretreatment in step (3) is as follows: Soak peanut shell particles in a 4% tea saponin solution and a 6% sucrose ester solution for 30-50 minutes at a solid-liquid mass ratio of 1:

15. Then add a 2.3% phosphate buffer solution. After the buffer has fully reacted with the peanut shells, filter and collect the particles. Wash with distilled water until the pH of the peanut shell particles reaches 6.8-7.0 and allow them to air dry. After air drying, place the peanut shell particles in a 1.7% ethanol solution at a solid-liquid mass ratio of 1:

12. Then add a 1.7% sodium chloride solution and stir and mix in a 50℃ constant temperature water bath for 50-70 minutes to ensure the extract fully reacts with the peanut shell particles and improves the enzyme extraction efficiency.

6. The high-efficiency and environmentally friendly underground spray dust suppression system for coal mines according to claim 5, characterized in that: The specific process of enzymatic hydrolysis in step (4) is as follows: collect the pretreated peanut shell particles and wash them with distilled water until the pH reaches 7.

0. After air drying, place them in a 0.4% (w / w) cellulase solution and a 0.4% (w / w) cucurbitacin solution. Select an acetate-sodium acetate buffer solution with a mass concentration of 0.2% (w / w) to facilitate enzyme stability. Add an acetate-ammonium acetate buffer solution with a mass concentration of 0.3-0.5% (w / w) to the above mixed solution to adjust the pH to 5.8-6.

0. Then place the solution in a constant temperature water bath at 48-50℃ and stir thoroughly for 2.0-2.5 hours to achieve the effect of dual enzyme degradation of peanut shells by cellulase and protease. During the enzymatic hydrolysis process, cellulase assists protease in removing proteins, thereby improving the protein hydrolysis rate and product purity.

7. The high-efficiency and environmentally friendly underground spray dust suppression system for coal mines according to claim 6, characterized in that: Step (5) is as follows: Take the enzymatically hydrolyzed solution and pour it into a centrifuge tube for centrifugation. Centrifuge 3 times at a speed of 10000~12000r / min. Then add 0.2% ethanol washing solvent to the centrifuge tube and gently shake or stir to make the precipitate fully contact the washing solvent. Then let it stand for 10 minutes and take out the precipitate at the bottom of the centrifuge tube. Transfer the precipitate to a dry container and place it for 2 hours before taking it out to obtain peanut shell cellulose.

8. The high-efficiency and environmentally friendly underground spray dust suppression system for coal mines according to claim 7, characterized in that: The specific process of step (6) is as follows: the extracted peanut shell cellulose is added to distilled water at a solid-liquid ratio of 1:10 and mixed with one or more of tea saponin, sucrose ester, soapberry and lipopeptide at a mass concentration of 0.05~0.07% to finally obtain an environmentally friendly coal mine dust suppressant.

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