Automatic spraying and dust falling device for tunnel engineering roadway

Abstract

The invention relates to the field of tunnel engineering roadway dust falling equipment, in particular to an automatic spraying dust falling device for a tunnel engineering roadway. Specific infrared signals and PM2.5 dust conditions at all positions are collected; the spray dust-settling water curtain comprises a plurality of groups of spray nozzles arranged on the mine wall; the plurality of spraying openings are connected with a water pump of a water source, and the spraying openings are partitioned; the water pump, the mining intrinsic safety wireless infrared sensor and the PM2.5 dust sensor are in communication connection with the mining intrinsic safety wireless automatic spraying and dust falling PLC control box; and the mining explosive-proof and intrinsic safety type direct-current power supply supplies power to the mining intrinsic safety wireless infrared sensor and the PM2.5 dust sensor. When automatic spraying work is carried out, an operator walks in a roadway and a mining intrinsic safety wireless infrared sensor senses a human body, a PLC sends an instruction to control the spraying device to automatically stop working, and the device is automatically started after the operator passes for 60 seconds, so that the operator is prevented from getting wet; when the manual function is switched, manual spraying can be achieved through the button.

Description

Technical Field

[0001] This invention relates to the field of dust suppression equipment for tunnel engineering roadways, and more particularly to an automatic spray dust suppression device for tunnel engineering roadways. Background Technology

[0002] Existing technologies for automatic sprinkler dust suppression devices in tunnel engineering have been continuously developing around traditional spraying and intelligent control. However, in practical applications, they have also revealed many shortcomings, such as water waste and insufficient adaptability. Among them, the source-spraying technology mounted on excavators involves directly installing sprinkler dust suppression devices on excavators used in tunnel construction. This can suppress dust at its source during excavation operations, preventing dust from spreading and increasing the difficulty of dust suppression. However, current systems based on this solution generally suffer from complex structures and high energy consumption, and are still in the optimization and improvement stage.

[0003] The liftable atomizing spray technology addresses the dust suppression needs of tunnels at different heights. A lifting frame is installed on a mobile platform, with arc-shaped pipes equipped with atomizing nozzles mounted on it. During operation, the height of the lifting frame can be adjusted to cover higher areas of the tunnel, solving the problem of traditional fogging machines' difficulty in suppressing dust at heights. The mobile platform also allows for flexible movement of the device within the tunnel. The ring-shaped portable mobile spray technology includes a mobile vehicle and support system. Multiple strip-shaped mobile modules are distributed circumferentially on the support frame. The movable spray devices within each module create a circumferentially converging spray effect. Its advantages include convenient mobility, reduced spray blind spots, high automation, and reduced labor costs.

[0004] Conventional fixed spraying technology was one of the earliest types of technology used. It typically involves fixing the spray pipes to locations such as the top of the tunnel support, using nozzles to spray water to create a mist for dust suppression. This technology is simple in structure and low in cost, but the fixed spraying location limits its flexibility, and it is mostly used as an auxiliary dust suppression method in conjunction with ventilation. Spraying operations can also easily cause environmental and equipment problems. On the one hand, it significantly increases humidity inside the tunnel, leading to slippery work surfaces and an increased risk of falls for construction workers. In high-altitude areas, it may also cause dizziness, itchy skin, and other discomfort for workers. On the other hand, the water mist can easily damage construction instruments inside the tunnel, reducing their accuracy and lifespan. When not in use, the exposed nozzles are also prone to dust blockage, affecting subsequent use.

[0005] Existing systems also suffer from resource waste and high costs. Most traditional systems cannot dynamically adjust the water spray volume based on dust concentration, often operating in a continuous spraying state, resulting in significant water waste. While some intelligent sprinkler systems offer good dust suppression, their complex structures and numerous components lead to high costs for initial construction, maintenance, and component replacement, hindering large-scale deployment. Furthermore, dust monitoring and parameter control exhibit lag. Dust concentration during tunnel excavation is random, influenced by geological changes and construction operations. Single dust concentration monitoring systems struggle to accurately set spray parameters, and the rapid dynamic changes in dust concentration mean that the feedback and control mechanisms of some existing systems are inadequate, making it difficult to match optimal spraying conditions in real time. In some scenarios, construction personnel still need to operate based on experience.

[0006] On December 11, 2025, a search was conducted in the China Patent Publication Database using "tunnel and sprinkler and PM2.5 and PLC and infrared" as the abstract keywords and with the option to allow synonym expansion. No relevant literature was found.

[0007] On December 11, 2025, an abstract search was conducted on CNKI (China National Knowledge Infrastructure) for the keywords "fresh air system and combination and air conditioning and detachable", but no relevant literature was found.

[0008] On December 11, 2025, a search was conducted on the website of the United States Patent and Trademark Office for the term "fresh air with system with combination with air conditioning with detachable", but no relevant literature was found; the search URL is https: / / ppubs.uspto.gov / pubwebapp / .

[0009] On December 11, 2025, a search was conducted on WIPO's website https: / / patentscope2.wipo.int / for the term "fresh air and system and combination and airconditioning and detachable", but no relevant literature was found.

[0010] On December 11, 2025, a search was conducted on the website of the Japan Patent Office (https: / / www.j-platpat.inpit.go.jp / ) for the term "fresh air and system and combination and airconditioning and detachable", but no relevant literature was found.

[0011] It is completely different from the concept of this patent. Summary of the Invention

[0012] Purpose of the invention: To provide a novel hernia treatment structure with better results, the specific purpose of which is described in the several substantial technical effects in the detailed implementation section.

[0013] To achieve the above objectives, the present invention adopts the following technical solution: An automatic sprinkler dust suppression device for tunnel engineering roadways is characterized in that the automatic sprinkler dust suppression device includes a mining intrinsically safe wireless automatic spray dust suppression PLC control box, a mining explosion-proof and intrinsically safe DC power supply, a mining intrinsically safe wireless infrared sensor, a PM2.5 dust sensor, and a spray dust suppression water curtain. The intrinsically safe wireless infrared sensor and PM2.5 dust sensor for mining are deployed throughout the mine to collect specific infrared signals and PM2.5 dust conditions at each location. The spray dust suppression water curtain consists of multiple sets of spray nozzles arranged on the mine wall; multiple spray nozzles are connected to water pumps for water sources, and the spray nozzles are divided into zones; The water pump, the intrinsically safe wireless infrared sensor for mining, and the PM2.5 dust sensor are connected to the intrinsically safe wireless automatic spray dust suppression PLC control box for mining. The explosion-proof and intrinsically safe DC power supply is used to power intrinsically safe wireless infrared sensors and PM2.5 dust sensors in mines.

[0014] A further technical solution of the present invention is that the spray nozzles are divided into zones, and the intrinsically safe wireless infrared sensors and PM2.5 dust sensors for mining are also divided into zones. The intrinsically safe wireless infrared sensors and PM2.5 dust sensors for mining in multiple zones are also divided into zones and include a field control box as a relay. The information obtained by the intrinsically safe wireless infrared sensors and PM2.5 dust sensors for mining in each zone is used as a reference for whether the spray nozzles in this zone are open or not.

[0015] A further technical solution of the present invention is that the intrinsically safe wireless automatic spray dust suppression PLC control box for mining is connected to a time module.

[0016] A further technical solution of the present invention is that the device has an automatic / manual switching function. Operators can control the start and stop of the spray dust suppression device through the buttons on the electrical control box, and at the same time, the automatic spraying function of the spray dust suppression device can be realized by using the PM2.5 dust sensor.

[0017] A further technical solution of the present invention is that multiple field control boxes are communicatively connected to an intrinsically safe wireless automatic spray dust suppression PLC control box for mining; the multiple field control boxes and the intrinsically safe wireless automatic spray dust suppression PLC control box for mining can all control the opening and closing of the spray nozzles, and are dual switches; the multiple field control boxes are equipped with an explosion-proof and intrinsically safe DC power supply for mining to power the nearby intrinsically safe wireless infrared sensor and PM2.5 dust sensor.

[0018] A further technical solution of the present invention is that the spray nozzles form a water curtain on the sidewalls and top of the mine.

[0019] The method for automatic dust suppression by spraying in tunnel engineering roadways is characterized by, The automatic dust suppression spraying device for tunnel engineering roadways described above has a heavy control mode, allowing operators to switch between manual and automatic operation according to the actual working conditions on site. It monitors personnel passage status in real time through infrared sensors, ensuring that dust suppression operations are automatically activated after personnel pass through the spraying area smoothly. Under normal circumstances, the PM2.5 dust sensor accurately collects dust concentration data, and automatically triggers the spraying function when the preset threshold is reached, thus achieving intelligent dust suppression. Multiple sets of spray dust suppression water curtains are installed along the roadway. Intrinsically safe wireless infrared sensors and PM2.5 dust sensors are installed on the roadway walls. When dust is generated during the transport of ore, the PM2.5 dust sensor detects a dust concentration that reaches a preset threshold and inputs a signal to the PLC controller. The PLC outputs a control to activate the solenoid valve of the dust suppression water curtain, automatically triggering the spray dust suppression function to reduce dust on the roadway and increase road humidity. During automatic spraying, when workers walk in the roadway, the intrinsically safe wireless infrared sensor detects a human body, and the PLC sends a command to control the spray device to automatically stop working. After 60 seconds, the device automatically restarts to prevent personnel from getting wet. When switching to manual function, manual spraying can be achieved via a button.

[0020] The present invention, employing the above technical solution, offers the following advantages over existing technologies: Equipped with an intrinsically safe wireless infrared sensor for mining, it can monitor personnel passage in real time, immediately stopping spraying upon detecting a human body and restarting after a 60-second delay. This avoids wetting personnel, reduces excess water mist, and lowers the risk of excessive humidity in tunnels. Simultaneously, it adopts an "on-demand spraying" mode, activating only when dust concentration reaches the standard, reducing nozzle idle time. Furthermore, the low residual moisture after spraying reduces the likelihood of dust accumulation and nozzle clogging, and also minimizes damage to construction equipment from water mist. Accurate dust concentration data is collected via a PM2.5 dust sensor, triggering spraying only when a preset threshold is reached, achieving dynamic matching of water volume and fundamentally preventing water waste caused by continuous spraying. The device as a whole adheres to intrinsically safe / explosion-proof mining characteristics, with components adapted to mining scenarios. Its modular design makes initial construction, subsequent maintenance, and component replacement more convenient and cost-effective, making it more suitable for large-scale deployment compared to complex intelligent systems. Attached Figure Description To further illustrate the present invention, the following description is provided in conjunction with the accompanying drawings: Figure 1 A flowchart for the invention; Figure 2 A schematic diagram of an intrinsically safe wireless automatic spray dust suppression PLC control box for mining applications; Figure 3 This is a structural diagram of the spray nozzle; Figure 4 This is a schematic diagram of an infrared probe; Figure 5 and Figure 6 This is a schematic diagram of the field control box; Detailed Implementation The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] Example 1: Referring to all the attached drawings; Automatic sprinkler dust suppression device for tunnel engineering roadways, characterized in that the automatic sprinkler dust suppression device includes a mining intrinsically safe wireless automatic spray dust suppression PLC control box, a mining explosion-proof and intrinsically safe DC power supply, a mining intrinsically safe wireless infrared sensor, a PM2.5 dust sensor, and a spray dust suppression water curtain; The intrinsically safe wireless infrared sensor and PM2.5 dust sensor for mining are deployed throughout the mine to collect specific infrared signals and PM2.5 dust conditions at each location. The spray dust suppression water curtain consists of multiple sets of spray nozzles arranged on the mine wall; multiple spray nozzles are connected to water pumps for water sources, and the spray nozzles are divided into zones; The water pump, the intrinsically safe wireless infrared sensor for mining, and the PM2.5 dust sensor are connected to the intrinsically safe wireless automatic spray dust suppression PLC control box for mining. The explosion-proof and intrinsically safe DC power supply for mining applications powers intrinsically safe wireless infrared sensors and PM2.5 dust sensors. The substantive technical effects and their implementation process, i.e., basic functions and non-obvious aspects, are as follows: This automatic device mainly consists of a mining intrinsically safe wireless automatic spray dust suppression PLC control box, a mining explosion-proof and intrinsically safe DC power supply, a mining intrinsically safe wireless infrared sensor, a PM2.5 dust sensor, and a spray dust suppression water curtain. The system has an automatic / manual switching function; operators control the start and stop of the spray dust suppression device via buttons on the control box. More importantly, the PM2.5 dust sensor enables the automatic spraying function of the spray dust suppression device.

[0022] Designed to efficiently solve dust problems during tunnel construction, this device features a dual control mode, allowing operators to switch between manual and automatic operation based on actual site conditions. Infrared sensors monitor personnel passage in real time, automatically activating dust suppression after personnel have successfully passed the spray area. Under normal circumstances, PM2.5 dust sensors accurately collect dust concentration data, automatically triggering the spray function when a preset threshold is reached, achieving intelligent dust suppression. Compared to traditional technologies, this system combines dual control modes, offering a higher level of intelligence and eliminating the need for manual operation. It provides precise dust suppression without affecting personnel passage, improves water resource utilization, has a compact structure, is easy to install and maintain, is adaptable to harsh construction environments, and significantly improves operational safety and cleanliness.

[0023] Working Principle: Multiple sets of spray dust suppression water curtains are installed along the roadway. Intrinsically safe wireless infrared sensors, PM2.5 dust sensors, and a PLC control box are installed on the roadway walls. When ore transport vehicles generate dust, the PM2.5 dust sensor detects a dust concentration that reaches a preset threshold and inputs a signal to the PLC controller. The PLC then controls the solenoid valve of the dust suppression water curtain to automatically trigger the spray dust suppression function, reducing dust on the roadway and increasing road humidity. During automatic spraying, when workers walk in the roadway, the intrinsically safe wireless infrared sensor detects a human body, and the PLC sends a command to automatically stop the spraying device. After 60 seconds, the device automatically restarts to prevent workers from getting wet. Manual spraying can be activated via a button.

[0024] The shortcomings of existing technologies: Excavators equipped with source spraying technology have complex structures and high energy consumption; the non-obviousness and significant technological advancements of this invention are reflected in: the modular design of "sensor + PLC control box + field control box", with intrinsically safe wireless infrared sensors for mining and PM2.5 dust sensors arranged in separate zones, and data transferred through the field control box, resulting in a simple structure and clear logic; the device only starts when the dust concentration reaches a preset threshold or meets the spraying conditions, and does not run continuously, which greatly reduces energy consumption and is more practical than traditional complex structures.

[0025] The shortcomings of existing technologies: conventional fixed spray technology has fixed spray positions and poor flexibility; the non-obviousness and significant technical progress of the present invention are: the spray nozzles are arranged in sections on the side walls and top of the mine, which can form a comprehensive water curtain, and the spray nozzles of each section can be independently controlled to start and stop through the sensor data of the corresponding area; at the same time, it supports dual switch control of the field control box and the intrinsically safe wireless automatic spray dust suppression PLC control box for mining, and with automatic / manual mode switching, it can accurately adapt to the dust suppression needs of different areas and different working conditions, and its flexibility far exceeds that of fixed spray technology.

[0026] The shortcomings of existing technologies: Spraying operations can easily lead to excessive humidity in tunnels, causing slippery roads, discomfort for personnel, and damage to construction equipment. Furthermore, the nozzles are prone to clogging with dust when idle. The non-obviousness and significant technological advancements of this invention are: Equipped with an intrinsically safe wireless infrared sensor for mining, it can monitor personnel passage in real time, immediately stopping spraying upon detecting a human body and restarting after a 60-second delay. This avoids wetting personnel, reduces excess water mist, and lowers the risk of excessive humidity in the tunnel. Simultaneously, it adopts an "on-demand spraying" mode, only activating when dust concentration reaches the standard, reducing nozzle idle time. The low residual moisture after spraying also reduces the likelihood of dust adhesion and clogging of the nozzles, further minimizing damage to construction equipment from water mist.

[0027] The shortcomings of existing technologies: most traditional devices cannot dynamically adjust the water spray volume, resulting in continuous spraying and wasting water resources; some intelligent systems are complex in structure and high in cost, which is not conducive to large-scale promotion. The non-obviousness and significant technical progress of this invention are as follows: by accurately collecting dust concentration data through a PM2.5 dust sensor, spraying is triggered only when a preset threshold is reached, realizing dynamic matching of the water spray volume and avoiding water waste caused by continuous spraying from the root; the device as a whole follows the intrinsically safe / explosion-proof characteristics for mining, the components are adapted to mining scenarios, and the modular design makes the early construction, later maintenance and component replacement more convenient and less costly, which is more conducive to large-scale promotion compared to complex intelligent systems. The shortcomings of existing technologies include: dust monitoring and parameter control are lagging, single monitoring makes it difficult to accurately set parameters, the feedback control mechanism is imperfect, and some scenarios require operation based on experience. The non-obviousness and significant technological advancements of this invention are: the use of dual monitoring with infrared and PM2.5 sensors can capture both dynamic changes in dust concentration and the status of personnel passage, with both data transmitted to the PLC control box in real time; the PLC's built-in logic processing unit enables multi-condition judgment, the feedback control mechanism is perfect, and it can quickly match the optimal spraying state, eliminating the need for construction personnel to operate based on experience, and completely solving the problems of lagging control and inaccurate parameter settings.

[0028] Example 2: As a further improvement, parallel, or optional independent solution, the sprinkler outlets are divided into zones, and the intrinsically safe wireless infrared sensors and PM2.5 dust sensors for mining are also divided into zones. Multiple zones of intrinsically safe wireless infrared sensors and PM2.5 dust sensors are also divided, with a field control box serving as a relay. The information obtained by the intrinsically safe wireless infrared sensors and PM2.5 dust sensors in each zone is used as a reference for whether the sprinkler outlets in that zone are open or closed. The substantial technical effects and implementation process, i.e., the basic functions and non-obvious aspects, are as follows: Zoned operation is achieved, enabling zoned control. Simultaneously, the zones can also function as active zones, meaning that the infrared signals are sequentially turned on or off based on human movement, i.e., several sprinkler heads before and after the worker.

[0029] Example 3: As a further improvement, parallel, or optional independent solution, the intrinsically safe wireless automatic spray dust suppression PLC control box for mining is connected to a time module. The substantial technical effect and its implementation process, i.e., basic functions and non-obvious aspects, are as follows: The time module can perform time judgment. For example, it can determine whether to activate the system after 60 seconds.

[0030] Example 4: As a further improvement, parallel, or optional independent solution, the device has an automatic / manual switching function. Operators can control the start and stop of the spray dust suppression device via buttons on the control box, and simultaneously utilize a PM2.5 dust sensor to achieve the automatic spraying function of the spray dust suppression device. The substantial technical effects and implementation process, i.e., the basic functions and non-obvious aspects, are as follows: it can achieve multiple functions.

[0031] Example 5: As a further possible improvement, parallel solution, or optional independent solution, multiple field control boxes are communicatively connected to a mine-use intrinsically safe wireless automatic spray dust suppression PLC control box. All field control boxes and the mine-use intrinsically safe wireless automatic spray dust suppression PLC control box can control the opening and closing of the spray nozzles, functioning as dual switches. Each field control box is equipped with a mine-use explosion-proof and intrinsically safe DC power supply to power nearby mine-use intrinsically safe wireless infrared sensors and PM2.5 dust sensors. The substantial technical effects and implementation process, i.e., the basic functions and non-obvious aspects, are as follows: It enables both central control and field control.

[0032] Example 6: As a further improvement, parallel, or optional independent solution, the spray nozzles form a water curtain on the mine sidewalls and roof. The substantial technical effects and implementation process, i.e., the basic functions and non-obvious aspects, are as follows: The method for automatic dust suppression by spraying in tunnel engineering roadways is characterized by, The automatic dust suppression spraying device for tunnel engineering roadways described above has a heavy control mode, allowing operators to switch between manual and automatic operation according to the actual working conditions on site. It monitors personnel passage status in real time through infrared sensors, ensuring that dust suppression operations are automatically activated after personnel pass through the spraying area smoothly. Under normal circumstances, the PM2.5 dust sensor accurately collects dust concentration data, and automatically triggers the spraying function when the preset threshold is reached, thus achieving intelligent dust suppression. Multiple sets of spray dust suppression water curtains are installed along the roadway. Intrinsically safe wireless infrared sensors and PM2.5 dust sensors are installed on the roadway walls. When dust is generated during the transport of ore, the PM2.5 dust sensor detects a dust concentration that reaches a preset threshold and inputs a signal to the PLC controller. The PLC outputs a control to activate the solenoid valve of the dust suppression water curtain, automatically triggering the spray dust suppression function to reduce dust on the roadway and increase road humidity. During automatic spraying, when workers walk in the roadway, the intrinsically safe wireless infrared sensor detects a human body, and the PLC sends a command to control the spray device to automatically stop working. After 60 seconds, the device automatically restarts to prevent personnel from getting wet. When switching to manual function, manual spraying can be achieved via a button.

[0033] Innovatively, each of the above effects exists independently, yet a single structure can be used to combine the results.

[0034] It should be noted that the multiple modules in this patent are an integration of existing technology modules and do not involve any new modules. Even if some modules use programs, those programs are undoubtedly known programs.

[0035] It should be noted that the multiple solutions provided in this patent include their own basic solutions, which are independent of each other and do not restrict each other. However, they can also be combined with each other without conflict to achieve multiple effects.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims.

Claims

1. An automatic sprinkler dust suppression device for tunnel engineering roadways, characterized in that, The automatic spray dust suppression device includes a mining intrinsically safe wireless automatic spray dust suppression PLC control box, a mining explosion-proof and intrinsically safe DC power supply, a mining intrinsically safe wireless infrared sensor, a PM2.5 dust sensor, and a spray dust suppression water curtain; The intrinsically safe wireless infrared sensor and PM2.5 dust sensor for mining are deployed throughout the mine to collect specific infrared signals and PM2.5 dust conditions at each location. The spray dust suppression water curtain consists of multiple sets of spray nozzles arranged on the mine wall; multiple spray nozzles are connected to water pumps for water sources, and the spray nozzles are divided into zones; The water pump, the intrinsically safe wireless infrared sensor for mining, and the PM2.5 dust sensor are connected to the intrinsically safe wireless automatic spray dust suppression PLC control box for mining. The explosion-proof and intrinsically safe DC power supply is used to power intrinsically safe wireless infrared sensors and PM2.5 dust sensors in mines.

2. The automatic sprinkler dust suppression device for tunnel engineering roadways as described in claim 1, characterized in that, The sprinkler outlets are divided into zones, as are the intrinsically safe wireless infrared sensors and PM2.5 dust sensors for mining. The intrinsically safe wireless infrared sensors and PM2.5 dust sensors for mining in multiple zones are also divided into zones, each containing a field control box as a relay. The information obtained by the intrinsically safe wireless infrared sensors and PM2.5 dust sensors for mining in each zone is used as a reference for whether the sprinkler outlets in that zone are open or closed.

3. The automatic sprinkler dust suppression device for tunnel engineering roadways as described in claim 1, characterized in that, The intrinsically safe wireless automatic spray dust suppression PLC control box for mining is connected to a time module.

4. The automatic sprinkler dust suppression device for tunnel engineering roadways as described in claim 1, characterized in that, The device has an automatic / manual switching function. Operators can control the start and stop of the spray dust suppression device through the buttons on the electrical control box, and at the same time, the automatic spraying function of the spray dust suppression device can be realized by using the PM2.5 dust sensor.

5. The automatic sprinkler dust suppression device for tunnel engineering roadways as described in claim 2, characterized in that, Multiple field control boxes are communicatively connected to the intrinsically safe wireless automatic spray dust suppression PLC control box for mining. Both the multiple field control boxes and the intrinsically safe wireless automatic spray dust suppression PLC control box for mining can control the opening and closing of the spray nozzles, and are dual switches. The multiple field control boxes are equipped with mining-safe explosion-proof and intrinsically safe DC power supplies to power nearby intrinsically safe wireless infrared sensors and PM2.5 dust sensors for mining.

6. The automatic sprinkler dust suppression device for tunnel engineering roadways as described in claim 2, characterized in that, The spray nozzles form a water curtain on the mine's sidewalls and top.

7. A method for automatic sprinkler dust suppression in tunnel engineering roadways, characterized in that, The automatic dust suppression spraying device for tunnel engineering roadways as described in any of claims 1-6 has a heavy control mode, allowing operators to switch between manual and automatic operation according to actual working conditions. It monitors personnel passage status in real time through infrared sensors, ensuring that dust suppression operations are automatically activated after personnel pass through the spraying area smoothly. Under normal circumstances, the PM2.5 dust sensor accurately collects dust concentration data, and automatically triggers the spraying function when the preset threshold is reached, thus achieving intelligent dust suppression. Multiple sets of spray dust suppression water curtains are installed along the roadway. Intrinsically safe wireless infrared sensors and PM2.5 dust sensors are installed on the roadway walls. When dust is generated during the transport of ore, the PM2.5 dust sensor detects a dust concentration that reaches a preset threshold and inputs a signal to the PLC controller. The PLC outputs a control to activate the solenoid valve of the dust suppression water curtain, automatically triggering the spray dust suppression function to reduce dust on the roadway and increase road humidity. During automatic spraying, when workers walk in the roadway, the intrinsically safe wireless infrared sensor detects a human body, and the PLC sends a command to control the spray device to automatically stop working. After 60 seconds, the device automatically restarts to prevent personnel from getting wet. When switching to manual function, manual spraying can be achieved via a button.

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