Environment-friendly dust falling device for mine construction

Abstract

The invention provides an environment-friendly dust falling device for mine construction, and relates to the technical field of dust falling devices.The dust falling device comprises a necking section, an inlet section is arranged at the left side end of the necking section, a throat section is arranged at the right side end of the necking section, and a spraying section is arranged at the right side end of the throat section; an inner mixing atomization mechanism for mixing water and compressed air is arranged in the throat section, efficient gas-water fusion can be achieved to form superfine fog drops, the dust trapping efficiency is greatly improved, through segmented disturbance of a protruding ring of the inner mixing atomization mechanism and the structural design that the two sides of a mixing cavity are small and the middle of the mixing cavity is large, gas-water multi-section step-by-step mixing is achieved, and the dust trapping efficiency is greatly improved. The standard deviation of particle size distribution of fog drops is reduced to be within 5 microns, the trapping efficiency is remarkably improved for PM2.5 and other fine particle dust generated in large quantities in the links of tunneling, blasting and the like in mine construction, meanwhile, traditional large-water-flow spraying is converted into superfine atomization, the water consumption for mine dust falling is greatly reduced, and the policy requirement of mine environment-friendly construction is met.

Description

Technical Field

[0001] This invention belongs to the technical field of dust suppression devices, and more specifically, relates to a dust suppression device for environmental protection in mining construction. Background Technology

[0002] During mining construction, core processes such as tunneling, blasting, open-pit mining, and underground transportation generate a large amount of dust pollutants. This includes not only larger visible dust particles but also significant amounts of fine particulate matter such as PM2.5 and PM10. These fine particulate dust particles are characterized by long suspension times, wide diffusion ranges, and difficulty in natural settling. On the one hand, they severely pollute the atmospheric environment surrounding the mine, failing to meet current policies for green mine construction and environmentally friendly construction. On the other hand, construction workers exposed to high dust levels for extended periods are highly susceptible to occupational diseases such as pneumoconiosis, threatening their health. Furthermore, high concentrations of dust can affect the operation of precision components in construction equipment, increasing the risk of equipment failure and posing a dust explosion hazard. Therefore, dust control during mining construction is a crucial step in ensuring construction safety, environmental protection, and the health of personnel.

[0003] Currently, the dust suppression devices commonly used in mining construction are mainly traditional spray dust suppression systems, but in practical applications, they have revealed many shortcomings in adaptability and functionality: Firstly, the atomization effect is poor. Traditional devices mostly use a single water flow spray or a simple air-water mixing structure, resulting in large droplet sizes (the standard deviation of the particle size distribution generally exceeds 10μm). This limits the contact area with fine dust particles, leading to a PM2.5 and other fine particle capture efficiency of less than 30%. Furthermore, to ensure dust suppression, a high water flow spray mode is required, causing a serious waste of precious water resources in the mine and increasing the cost of wastewater discharge and treatment. Secondly, the droplets are easily dispersed and lost. In order to ensure ventilation, there is a continuous airflow in the dust collection channel of the mine. The droplets sprayed by the traditional device lack effective restraint and are easily blown away by the airflow. A large number of droplets adhere to the channel wall or drift into the air without contacting the dust. The droplet utilization rate is extremely low, resulting in a significant reduction in the dust suppression effect. Third, nozzle clogging is a frequent problem. Dust concentration in mining operations is extremely high, especially after blasting operations when dust concentration rises sharply in a short period of time. Traditional nozzles lack protective structures, and dust is easily adsorbed back at the nozzle, causing blockage and failure of the atomization function. Frequent shutdowns for cleaning and maintenance are required, which seriously affects the high-intensity and continuous construction rhythm of mines. Fourth, the structure lacks stability and adaptability. The mining construction environment is complex. The violent vibrations generated by blasting and the continuous vibrations caused by equipment operation can easily lead to loosening of the connections of traditional devices and poor sealing performance. High-pressure gas-water mixtures are prone to leakage. At the same time, its fixed spray range cannot meet the dust suppression needs of different operating scenarios such as narrow tunnels, open mining areas, and above conveyor belts.

[0004] In response to the technical pain points in dust suppression during mining construction, there is an urgent need to develop an environmentally friendly dust suppression device with excellent atomization effect, high droplet utilization rate, stable structure, strong adaptability, and convenient maintenance. This device would solve problems such as low fine particle collection efficiency, high water consumption, easy nozzle clogging, and poor adaptability of traditional devices, and meet the environmentally friendly, safe, and efficient dust suppression requirements of mining construction. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a dust suppression device for environmental protection in mining construction, which solves the problems of low fine particle (PM2.5, etc.) collection efficiency, easy dispersion of droplets by ventilation airflow, easy clogging of nozzles by high concentrations of dust, weak adaptability to different operating scenarios, high water consumption, and inconvenient maintenance of traditional dust suppression devices in mining construction.

[0006] A dust suppression device for environmental protection in mining construction includes a constriction section, an inlet section at the left end of the constriction section, a throat section at the right end of the constriction section, and a spray section at the right end of the throat section. The throat section contains an internal mixing atomizing mechanism for mixing water and compressed air, enabling efficient air-water fusion to form ultrafine droplets, significantly improving dust collection efficiency. The spray section contains a wind pressure protection mechanism to constrain droplet trajectory, prevent scattering and waste, and prevent dust from clogging the nozzle. A top rod is slidably installed within the spray section, allowing for fine-tuning of the shielding cover position to optimize the droplet spray range. The right end of the spray section has a shielding cover that protects the nozzle core and guides the droplets for directional spraying. The inlet section has a front cavity with a smooth inner wall, and the seamless connection between the left end and the water inlet pipe effectively reduces resistance during water flow. To mitigate leakage risks and ensure stable water supply, the constriction section and the inlet section are connected by threads with a sealing gasket at the connection point. The threaded connection facilitates later disassembly and maintenance. The sealing gasket is made of high-pressure resistant rubber to prevent leakage of the high-pressure gas-water mixture, avoiding resource waste and reduced dust suppression effect. A contraction chamber is formed within the constriction section, with a conical groove on the left side. The diameter of the conical groove is larger than that of the contraction chamber. This structural design allows the water flow to double due to the sudden reduction in cross-sectional area, providing sufficient kinetic energy for subsequent gas-water mixing and atomization, thus improving atomization efficiency. The constriction section and the throat section are fixedly connected by four high-strength bolts, with a sealing gasket between them. The high-strength bolts ensure a stable connection structure, adapting to the complex vibration conditions of mining construction. The double-sealing design further enhances the device's sealing performance, ensuring stable operation under high-pressure environments.

[0007] Preferably, the internal mixing atomizing mechanism includes a raised ring and gas nozzles. The gas nozzles are circumferentially and equidistantly installed on the raised ring. This equidistant distribution design ensures that high-pressure air can be evenly injected into the mixing chamber, forming omnidirectional contact with the water flow and improving mixing uniformity. An air chamber is opened in the throat section, and air pipe connectors are fixedly installed on both ends of the throat section. The two air pipe connectors are connected to an air pump. The bidirectional air supply design can make the air pressure distribution inside the air chamber even, providing a stable high-pressure air source for the gas nozzles and ensuring the continuity of the atomization process. Each gas nozzle is connected to the air chamber opened in the throat section. The connection ensures that high-pressure air can be quickly delivered to the nozzle for secondary pressurization, enhancing the jet force of the airflow. A mixing chamber is opened in the throat section. The inner diameter of the mixing chamber is small on both sides and large in the middle. This special structure can enhance the fluid turbulence effect, prolong the air-water contact time, promote the formation and collapse of cavitation bubbles, and break the water flow into ultra-fine droplets. At the same time, the protruding ring cooperates with the gas nozzle to form multiple turbulence areas in the mixing chamber, so that the air-water mixing changes from a single contact to a step-by-step enhanced mixing, further optimizing the atomization effect, reducing water consumption, and improving the capture ability of fine particulate matter such as PM2.5.

[0008] Preferably, the wind pressure protection mechanism includes jet pipes, each jet pipe having a movable flat air pressure nozzle at its end. The flat air pressure nozzles are flat in shape and equidistantly distributed around the ejection section. This combination of flat structure and equidistant distribution design allows the ejected airflow to form an annular air curtain, effectively constraining the diffusion trajectory of atomized droplets, preventing the droplets from being blown away by the mine ventilation airflow, and improving droplet utilization. A nozzle core is fixedly installed within the ejection section, and each jet pipe is fixedly installed on the nozzle core. The connection is secure, and the airflow delivery path is smooth, ensuring that high-pressure air can be quickly delivered to the flat air pressure nozzles, guaranteeing timely formation of the air curtain. For enhanced safety and stability, the nozzle core features a through-hole ventilation hole that connects to the air chamber in the throat section. This allows for the synchronous distribution of high-pressure air, enabling internal mixing atomization and wind pressure protection to work synergistically. The air curtain not only confines the droplets but also accelerates their movement, increasing the probability of collision with dust. Simultaneously, it forms an air barrier to prevent dust from being reverse-adsorbed and clogging the nozzle, thus extending the device's lifespan. The nozzle core's interior is connected to the mixing chamber in the throat section. This interconnected design ensures that ultrafine droplets can be smoothly discharged, forming a synergistic dust suppression system with the air curtain. Under the protection of the air curtain, the droplets are directed towards the dusty area, improving dust suppression accuracy and overall effectiveness.

[0009] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the protruding ring segmented disturbance of the internal mixing atomization mechanism and the structural design of the mixing chamber being small on both sides and large in the middle achieve multi-stage stepwise mixing of air and water, reducing the standard deviation of droplet size distribution to within 5μm. This significantly improves the collection efficiency for fine particulate dust such as PM2.5 generated in large quantities during tunneling and blasting in mining construction. At the same time, it transforms traditional high-flow-rate spraying into ultra-fine atomization, greatly reducing the amount of water used for dust suppression in mines, which meets the policy requirements for environmentally friendly construction in mines.

[0010] In this invention, the flat air pressure nozzles of the wind pressure protection mechanism are circumferentially distributed to form an annular external pressure air curtain. On the one hand, this curtain resists the interference of ventilation airflow in the dust collection channel of the mine, and constrains the droplets to be directed towards the dust source, such as the tunnel face or above the conveyor belt, to avoid the droplets from drifting and being wasted, thus improving the accuracy of dust suppression. On the other hand, it forms an air barrier to prevent high-concentration dust in the mine from being reverse-adsorbed and clogging the nozzles, solving the problem that traditional dust suppression devices are prone to failure in the harsh environment of the mine, and ensuring continuous dust suppression operations.

[0011] In this invention, the cross-sectional area of ​​the conical groove in the constriction section is suddenly reduced, and the inlet section's front cavity is treated with a 15° chamfer, which doubles the water flow velocity while reducing turbulence loss, providing sufficient kinetic energy for gas-water mixing. Combined with the double sealing structure of the constriction section, inlet section, and throat section, it effectively copes with the high pressure and vibration conditions in mining construction, avoids leakage of gas-water mixture, and ensures that the dust suppression effect does not decrease in different scenarios such as underground and open-pit mines.

[0012] In this invention, the design of the slidingly installed top rod and the shielding cover in the spraying section allows for fine adjustment of the spraying range of the mist droplets according to different working areas in the mine, such as narrow tunnels and open mining areas. This makes the dust suppression coverage more in line with actual construction needs. At the same time, the shielding cover can protect the nozzle core from direct impact from mine gravel and dust, extending the service life of the components under complex mining conditions.

[0013] In this invention, the threaded connection between the inlet section and the constriction section, and the high-strength bolt connection between the constriction section and the throat section, enable the rapid disassembly and assembly of the various components of the device. This facilitates the cleaning, maintenance, and replacement of internal components during mining construction breaks, reduces the difficulty and cost of operation and maintenance in remote mining scenarios, and ensures that the device can adapt to the high-intensity and continuous construction rhythm of mines for a long time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the endotracheal connector of the present invention; Figure 3 This is a schematic diagram of the structure of the entry section of the present invention; Figure 4 This is a schematic diagram of the constricted section of the present invention; Figure 5 This is a schematic diagram of the throat segment of the present invention; Figure 6 This is a schematic diagram of the ejection section of the present invention; Figure 7 This is a schematic diagram of the nozzle core of the present invention; Figure 8 This is the present invention. Figure 5 An enlarged schematic diagram of the structure at point A.

[0015] In the figure, the correspondence between the component names and the attached drawing numbers is as follows: 1. Inlet section; 2. Narrowing section; 3. Throat section; 4. Ejection section; 5. Shielding cover; 6. Air pipe connector; 7. Front chamber; 8. Contraction chamber; 10. Conical groove; 12. Mixing chamber; 13. Protruding ring; 14. Gas nozzle; 15. Air chamber; 17. Push rod; 18. Nozzle core; 19. Vent hole; 20. Air jet pipe; 21. Flat air pressure nozzle. Detailed Implementation

[0016] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0017] Please see Figures 1-8 This invention provides a dust suppression device for environmental protection in mining construction, comprising an inlet section 1, a constriction section 2 integrally connected to the right end of the inlet section 1, a throat section 3 fixedly installed at the right end of the constriction section 2, an outlet section 4 installed at the right end of the throat section 3, an internal mixing atomization mechanism for achieving efficient mixing of water and compressed air in the throat section 3, and a wind pressure protection mechanism for constraining the trajectory of droplets and preventing them from drifting and being wasted in the outlet section 4. A top rod 17 is slidably installed in the outlet section 4, and a shielding cover 5 is fitted at its right end, forming an integrated dust suppression channel for inlet, constriction, mixing and outlet.

[0018] Specifically, refer to Figure 3 and Figure 4 As shown, the inlet section 1 serves as a water flow introduction component, with a front cavity 7 inside. The left end is seamlessly connected to the water inlet pipe to ensure no leakage during water flow. The inner wall of the front cavity 7 is chamfered at 15°. This design can effectively reduce turbulence loss when water flows in, reduce energy loss, and improve the stability of water flow introduction.

[0019] The constriction section 2 and the inlet section 1 are connected by threads to achieve detachable assembly. A sealing gasket is provided at the connection. The sealing gasket is made of high-pressure resistant rubber to prevent high-pressure water from leaking from the connection gap and to ensure the sealing of the device.

[0020] The constriction section 2 has a constriction cavity 8 inside, and a conical groove 10 is provided on the left side of the constriction cavity 8. The diameter of the conical groove 10 is larger than that of the constriction cavity 8, and the cone angle is 25°. When the water flows into the front cavity 7 of the inlet section 1 and flows through the conical groove 10, the water flow velocity is instantly increased by the sudden reduction of the cross-sectional area, providing sufficient kinetic energy for subsequent air-water mixing and atomization.

[0021] The constriction section 2 and the throat section 3 are symmetrically fixedly connected by four high-strength bolts. The bolt connection is also equipped with a sealing gasket, which not only ensures the stability of the connection structure, but also prevents the leakage of gas-water mixture.

[0022] refer to Figure 5 , Figure 7 and Figure 8 As shown, the internal mixing atomization mechanism includes a raised ring 13 and a gas nozzle 14. The gas nozzle 14 is installed equidistantly along the circumference of the raised ring 13. Each gas nozzle 14 is interference-fitted with the mounting hole of the raised ring 13 to ensure a tight connection.

[0023] The throat section 3 has an annular air chamber 15 inside, and air pipe connectors 6 are fixedly installed on both sides of the chamber. Both air pipe connectors 6 are connected to an external air pump to form a bidirectional air supply channel. Each gas nozzle 14 is connected to the air chamber 15 to ensure that high-pressure air can be evenly distributed to each gas nozzle 14.

[0024] A mixing chamber 12 is also provided inside the throat section 3. The inner diameter of the mixing chamber 12 is small on both sides and large in the middle. This structure can effectively enhance the intensity of fluid turbulence and improve the mixing effect of air and water.

[0025] It should be noted that the raised ring 13 is laid flat and fixed on the inner wall of the mixing chamber 12, forming a uniformly distributed raised structure in the mixing chamber 12. With the segmented disturbance design of the raised ring 13, each raised ring 13 will form an independent small turbulence zone, which transforms the gas-water mixing from the traditional single mixing to a multi-stage step-by-step mixing mode, greatly improving the mixing uniformity.

[0026] When the water, accelerated by the contraction chamber 8, enters the mixing chamber 12 of the throat section 3, the air pump starts simultaneously and introduces high-pressure air into the air chamber 15 through the air pipe connector 6. The air is distributed to each gas nozzle 14 through the air chamber 15 and then pressurized again, and sprayed at high speed into the mixing chamber 12 to merge with the water flow.

[0027] The mixing chamber 12, with its smaller sides and larger center, accelerates the fluid as it enters the throat, decelerates in the middle region, and accelerates again upon exiting, further enhancing air-water turbulence during these velocity changes. Simultaneously, cavitation bubbles form and burst synchronously in multiple small turbulence zones, dispersing and uniformly dispersing energy. This breaks the water droplets into finer particles, ensuring a small mixing of air and water in each loop. Ultimately, this reduces the standard deviation of droplet size distribution from 10μm to less than 5μm, completely solving the problem of mixed coarse and fine droplets in traditional nozzles. This significantly improves the collection efficiency of PM2.5 particles in mines and transforms traditional high-flow-rate spraying into an ultra-fine atomization mode, drastically reducing water consumption while maintaining dust suppression effectiveness.

[0028] refer to Figure 6 and Figure 7 As shown, the wind pressure protection mechanism includes jet pipes 20 and nozzle cores 18. The number of jet pipes 20 is set to more than ten, which are equidistantly distributed along the circumference of the nozzle cores 18. Each jet pipe 20 is equipped with a movable flat air pressure nozzle 21 at its end. The flat air pressure nozzle 21 adopts a flat structure design, which facilitates the formation of an annular air curtain.

[0029] The nozzle core 18 is fixedly installed inside the spray section 4, and a vent hole 19 is opened through it. The vent hole 19 is connected to the air chamber 15 opened in the throat section 3 to realize the synchronous delivery of high-pressure air. The jet pipe 20 is fixed to the nozzle core 18 by welding, and the connection is sealed to prevent air leakage.

[0030] The nozzle core 18 is also connected to the mixing chamber 12 of the throat section 3, ensuring that the atomized fluid after the air-water mixture can smoothly enter the nozzle core 18 and finally be sprayed out directionally from the end of the nozzle core 18 and the shield 5.

[0031] Specifically, when the air pump is working, high-pressure air enters the air chamber 15 of the throat section 3 for air-water mixing, and enters the jet pipe 20 through the vent 19, and is ejected at high speed through the flat air pressure nozzle 21, forming an annular external pressure air curtain around the device. This air curtain is not just a simple protective structure, but has three core functions: Firstly, it constrains the trajectory of droplets, preventing them from drifting and wasting. Dust collection channels in mines have ventilation airflow, and droplets from traditional nozzles are easily dispersed by this airflow. Some droplets drift towards the channel walls or ceiling without contacting the dust, resulting in low water efficiency and poor dust suppression. In contrast, the annular air curtain creates a negative pressure zone around the ultra-fine droplets, firmly confining them within the air curtain and guiding them towards the direction of dust flow. This effectively resists interference from ventilation airflow and significantly improves droplet utilization.

[0032] Secondly, it accelerates the collision and agglomeration of droplets and dust. The high-speed airflow of the external pressure air curtain drives the droplets to accelerate synchronously, significantly increasing the probability of collision between droplets and dust particles. At the same time, the air curtain can forcibly push open the air boundary layer around the dust particles, breaking the barrier of the air film on the dust surface to the contact of droplets, allowing ultrafine droplets to be directly adsorbed onto the dust surface. The adsorption effect is particularly prominent for fine particles such as PM2.5, further improving dust reduction efficiency.

[0033] Third, it prevents dust from clogging the nozzles. The external pressure air curtain continuously blows out from the outside of the nozzle, forming a dense air barrier that effectively prevents dust in the dust collection channel from being reversed and adsorbed at the nozzle nozzle. This solves the atomization failure problem caused by dust clogging in traditional nozzles at its root, significantly reduces the probability of nozzle clogging in harsh mining environments, and extends the service life of the equipment.

[0034] It should be noted that the sliding fit design between the top rod 17 and the spray section 4 allows the shielding cover 5 to be finely adjusted by sliding the top rod 17 during device maintenance or atomization angle adjustment, thereby optimizing the droplet spray range. The threaded connection between the constriction section 2 and the inlet section 1, and the high-strength bolt connection between the throat section 3 and the constriction section 2 are all detachable designs, which facilitates the maintenance and replacement of internal components in the later stage, improving the practicality and ease of operation and maintenance of the device.

[0035] Working principle: The first step is to start the supporting water supply system and air pump to establish a stable water flow and high-pressure air flow supply system, ensuring that the equipment has the basic conditions for continuous dust suppression operation.

[0036] In the second step, the water flows through the inlet pipe and enters the front cavity 7 of the inlet section 1 through the seamless connection structure. The 15° chamfer design of the inner wall of the front cavity 7 effectively reduces the water flow turbulence loss and allows the water to be smoothly introduced into the constriction section 2. When the water flows through the conical groove 10 of the constriction section 2, the flow velocity is doubled by the effect of the sudden reduction of cross-sectional area. Then, it flows through the contraction cavity 8 at high speed, accumulating sufficient kinetic energy for the subsequent air-water mixing and atomization.

[0037] The third step involves the synchronously started air pump generating high-pressure air, which is bidirectionally introduced into the annular air chamber 15 through the air pipe joints 6 on both sides of the throat section 3. The air pressure in the air chamber 15 is evenly distributed, and the high-pressure air is evenly distributed to each gas nozzle 14. After being pressurized a second time by the gas nozzle 14, the air is injected into the mixing chamber 12 of the throat section 3 in the form of a high-speed airflow.

[0038] In the fourth step, the high-speed water flow and high-pressure air converge in the mixing chamber 12. The special structure of the mixing chamber 12, which is small on both sides and large in the middle, causes the fluid to undergo speed changes of acceleration, deceleration, and re-acceleration, which enhances the air-water turbulence. At the same time, the raised ring 13 on the inner wall of the mixing chamber 12 forms multiple independent small turbulence zones, which transforms the air-water mixing from a single contact to multi-stage stepwise mixing. Cavitation bubbles are formed and broken up synchronously in each turbulence zone, breaking the water flow into ultrafine droplets with a particle size distribution standard deviation ≤5μm. This realizes the transformation from high-flow-rate spraying to ultrafine atomization, greatly improving the fine particle capture capacity and reducing water consumption.

[0039] Fifth, while high-pressure air is introduced into the air chamber 15, it is simultaneously distributed to the jet pipe 20 through the vent hole 19 on the nozzle core 18, and ejected at high speed through the flat air pressure nozzle 21 at the end, forming an annular external pressure air curtain. On the one hand, the air curtain forms a negative pressure zone around the ultrafine droplets, constraining the droplet trajectory and preventing them from being blown away by the mine ventilation airflow, thus improving the droplet utilization rate. On the other hand, it drives the droplets to accelerate their movement, breaking the air boundary layer on the dust surface and increasing the probability of collision between droplets and dust. At the same time, it forms an air barrier to prevent dust from being reverse-adsorbed and clogging the nozzle, ensuring the continuity of atomization.

[0040] In the sixth step, the ultrafine droplets formed in the mixing chamber 12 are smoothly discharged through the through-channel between the nozzle core 18 and the mixing chamber 12. Under the directional guidance of the annular air curtain, they are precisely directed towards the dust area generated by the mining construction. The droplets efficiently adsorb dust particles, achieving rapid dust settling and environmentally friendly dust reduction. During the operation, the position of the shielding cover 5 can be finely adjusted by sliding the top rod 17 in the spray section 4 to optimize the droplet spray range and adapt to the dust reduction needs of different construction scenarios.

[0041] Step 7: After completing the preset dust suppression operation, shut off the water supply system and air pump to stop the fluid supply; use the device's detachable connection structure to clean and maintain each component, removing residual dust and scale to ensure the device's sealing performance, atomization effect, and air curtain protection function are stable and reliable during subsequent operations.

[0042] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A dust suppression device for environmental protection in mining construction, comprising a narrowed section (2), characterized in that: The constriction section (2) has an inlet section (1) at its left end, a throat section (3) at its right end, an ejection section (4) at its right end, an internal mixing atomizing mechanism for mixing water and compressed air inside the throat section (3), a wind pressure protection mechanism inside the ejection section (4), a top rod (17) slidably installed inside the ejection section (4), and a shielding cover (5) at its right end. The inlet section (1) has a front cavity (7) and the left end of the inlet section (1) is seamlessly connected to the water inlet pipe. The constriction section (2) and the inlet section (1) are connected by a thread and a sealing gasket is provided at the connection. The constriction section (2) has a contraction cavity (8) and a conical groove (10) is provided on the left side of the contraction cavity (8). The diameter of the conical groove (10) is larger than that of the contraction cavity (8). The constriction section (2) and the throat section (3) are fixedly connected by four high-strength bolts and a sealing gasket is provided between the throat section (3) and the constriction section (2).

2. The dust suppression device for environmental protection in mining construction as described in claim 1, characterized in that, The internal mixing atomizing mechanism includes a raised ring (13) and a gas nozzle (14), wherein the gas nozzle (14) is circumferentially and equidistantly mounted on the raised ring (13).

3. The dust suppression device for environmental protection in mining construction as described in claim 2, characterized in that, An air chamber (15) is provided inside the throat segment (3), and a tracheal connector (6) is fixedly installed on both sides of the throat segment (3).

4. The dust suppression device for environmental protection in mining construction as described in claim 3, characterized in that, The two air pipe connectors (6) are connected to the air pump, and each of the gas nozzles (14) is connected to the air chamber (15) opened in the throat section (3).

5. The dust suppression device for environmental protection in mining construction as described in claim 4, characterized in that, A mixing chamber (12) is provided inside the throat segment (3), and the inner diameter of the mixing chamber (12) is smaller on both sides and larger in the middle.

6. The dust suppression device for environmental protection in mining construction as described in claim 5, characterized in that, The wind pressure protection mechanism includes jet pipes (20), and each jet pipe (20) has a movable flat air pressure nozzle (21) at its end.

7. The dust suppression device for environmental protection in mining construction as described in claim 6, characterized in that, The flat air pressure nozzle (21) is flat in shape and is distributed equidistantly on the spray section (4). The nozzle core (18) is fixedly installed in the spray section (4).

8. The dust suppression device for environmental protection in mining construction as described in claim 7, characterized in that, Each of the jet pipes (20) is fixedly mounted on the nozzle core (18), and the nozzle core (18) has a through-hole (19).

9. The dust suppression device for environmental protection in mining construction as described in claim 8, characterized in that, The vent hole (19) of the nozzle core (18) is connected to the air chamber (15) of the throat section (3).

10. The dust suppression device for environmental protection in mining construction as described in claim 9, characterized in that, The nozzle core (18) is connected to the mixing chamber (12) opened in the throat section (3).

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