A dust concentration monitoring device for underground mines

Abstract

This invention relates to the field of dust concentration monitoring technology and discloses a dust concentration monitoring device for underground mines, comprising: a dust concentration monitor, a detection box installed at the bottom of the dust concentration monitor, a monitoring head located inside the detection box at the bottom of the dust concentration monitor, and an air inlet pipe fixedly connected to one side of the front of the detection box. This underground dust concentration monitoring device, by setting up a monitoring air diversion and drying component, introduces a portion of the ambient air into the drying box through the diversion pipe for dehumidification, and then the dried air flows back to the detection box through the dried air inlet channel. This structure establishes an active air humidity control mechanism, which can reduce the humidity of the gas entering the detection area from the source, effectively preventing condensation or reading distortion of the monitoring head due to high ambient humidity, and significantly improving the accuracy and environmental adaptability of dust concentration monitoring. Simultaneously, the design of the liquid collection tank enables the collection of condensate, keeping the system dry.

Description

Technical Field

[0001] This invention relates to the field of dust concentration monitoring technology, specifically to a dust concentration monitoring device for underground mines. Background Technology

[0002] During mining operations, large amounts of rock dust and coal dust are generated and suspended in the air. This dust not only seriously endangers the occupational health of underground workers, easily causing pneumoconiosis, but also poses an explosion risk when it reaches a certain concentration, constituting a significant threat to safe mine production. Therefore, real-time and accurate monitoring of dust concentration in the underground working environment is a crucial step in preventing occupational diseases and eliminating safety accidents.

[0003] Currently, dust concentration monitoring equipment widely used in mines is mainly based on the principle of light scattering. Its basic working principle is to use an air pump to draw dust-laden air from the area to be measured into the detection chamber, and then use a monitoring head (usually a laser emitter and receiver) to irradiate the dust particles in the airflow and detect the intensity of the scattered light to calculate the dust concentration. However, the mine environment is extremely harsh, characterized by high humidity (often close to saturation), high dust concentration, and adhesive properties. This poses a serious challenge to the long-term reliable operation of existing monitoring equipment. Specifically, the core components of the monitoring head, such as the optical window and lens, require extremely high cleanliness. When the high-humidity air from underground is drawn into the detection chamber, it easily condenses into water mist upon encountering the relatively cool surface of the lens, severely interfering with or even blocking the light path. Simultaneously, moist dust particles are more likely to adhere to the window, forming a layer of dirt. Both of these situations can lead to uncalibrated attenuation of the scattered light signal, resulting in severely low monitoring readings or complete failure, rendering the equipment ineffective. Water vapor in the air itself also weakly scatters or absorbs light of specific wavelengths, and humidity changes alter the physical properties of dust particles (such as particle size and refractive index). Existing equipment generally lacks the ability to actively control the humidity of the sample gas entering the detection chamber. Monitoring results are subject to background drift due to fluctuations in the underground environment's humidity, leading to poor stability and comparability of long-term monitoring data, making it difficult to accurately reflect the changing trends of dust concentration. Summary of the Invention

[0004] The purpose of this invention is to provide a dust concentration monitoring device for underground mines to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dust concentration monitoring device for underground mines, comprising: A dust concentration monitor, wherein a detection box is installed at the bottom of the dust concentration monitor, a monitoring head is located inside the detection box at the bottom of the dust concentration monitor, an air inlet pipe is fixedly connected to one side of the front of the detection box, and an air outlet pipe is provided at the rear of the detection box; An air diversion and drying assembly is installed at the front of the detection chamber. The assembly includes a diversion pipe, one end of which is connected to an air inlet pipe. A drying chamber is installed at one end of the diversion pipe. An exhaust fan is installed at the front of the inner cavity of the air inlet pipe. A desiccant storage mesh box is fixedly fitted inside the inner cavity of the drying chamber. The desiccant storage mesh box contains desiccant. A desiccant storage tank is installed on the top of the desiccant storage mesh box. A liquid collection bucket is installed at the bottom of the desiccant storage mesh box. A dry air intake channel is installed at the rear of the drying chamber, next to the desiccant storage mesh box. The dry air intake channel passes through the detection chamber and enters the chamber.

[0006] Furthermore, the monitoring air diversion and drying assembly also includes a diversion plate, which is installed inside the air intake pipe.

[0007] Furthermore, a dust isolation assembly is provided on the rear side of the drying chamber. The dust isolation assembly includes an air distribution pipe, a booster pump, and an air outlet. An air distribution pipe located on one side of the dry air intake channel is installed on the rear side of the drying chamber. The front side of the air distribution pipe is fixedly sleeved on the front side of the testing chamber. One end of the air distribution pipe is connected to a booster pump, and an air outlet is installed on one side of the booster pump.

[0008] Furthermore, the diameter of the air distribution pipe gradually decreases towards the air outlet, and the air outlet of the air outlet faces the bottom of the monitoring head.

[0009] Furthermore, the inner cavity of the air inlet pipe is provided with a desiccant agitation assembly, which includes a first rotating rod, a first bevel gear, a second rotating rod, a second bevel gear, a stirring blade, and a protective cover. The output end of the exhaust fan is connected to the first rotating rod, and the second rotating rod is movably sleeved on one side of the desiccant storage mesh box. One end of the protective cover is connected to the second bevel gear, and one end of the first rotating rod is connected to the first bevel gear. The external teeth of the first bevel gear mesh with the external teeth of the second bevel gear. The protective cover is sleeved on the outside of the first bevel gear, the first rotating rod, the second bevel gear, and the second rotating rod, and is connected to the desiccant storage mesh box. A stirring blade located inside the desiccant storage mesh box is installed on the outside of the second rotating rod.

[0010] Furthermore, the second rotating rod is perpendicular to the first rotating rod, and the outer side of the second rotating rod is provided with a number of stirring blades evenly distributed along the circumference of the second rotating rod.

[0011] Furthermore, the inner cavity of the testing box is equipped with a dust cleaning assembly, which includes a motor, a lead screw, a moving block, and a cleaning box. The motor is installed on the front side of the inner cavity of the testing box, and the output end of the motor is connected to the lead screw. The outer side of the lead screw is threaded to the moving block, and the cleaning box is installed on one side of the moving block. The front side of the cleaning box is connected to the inner wall of the testing box by a telescopic rod, and the top of the cleaning box is equipped with a brush.

[0012] Furthermore, the dust cleaning assembly also includes a nozzle, a water pump, and a liquid pipe. A water pump is installed at the rear of the liquid collection tank, and the output end of the water pump is connected to a liquid pipe. One end of the liquid pipe is connected to the cleaning tank, and a nozzle is installed on the top of the cleaning tank.

[0013] Furthermore, the cleaning tank is equipped with nozzles on both the front and rear sides of its top, and the brush is located between the front and rear nozzles.

[0014] Furthermore, a second drain valve is installed at the bottom of the detection box, and a first drain valve is installed at the bottom of the liquid collection tank.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This underground dust concentration monitoring equipment utilizes an air diversion and drying component. Part of the ambient air is diverted through a diversion pipe into a drying chamber for dehumidification. The dried air then flows back to the detection chamber through a dry air intake channel. This structure establishes an active air humidity control mechanism, reducing the humidity of the gas entering the detection area at the source. This effectively prevents condensation or reading distortion of the monitoring head due to high humidity, significantly improving the accuracy and environmental adaptability of dust concentration monitoring. Simultaneously, the liquid collection tank design collects condensate, keeping the system dry.

[0016] 2. The dust concentration monitoring equipment in this mine uses dry air drawn from the air distribution pipe, pressurized by a booster pump, and blown out from the air outlet. This creates a continuous and stable dry air curtain on the surface of the optical sensor in the monitoring head. This air curtain physically isolates the direct contact between high-concentration dust and humid air from the outside, fundamentally preventing dust adhesion and moisture condensation, protecting the cleanliness of the core optical components, ensuring the long-term stability of the monitoring signal, and greatly extending the maintenance-free period.

[0017] 3. This underground dust concentration monitoring equipment utilizes the power of an exhaust fan to drive the rotation of agitator blades within the desiccant storage box via a transmission mechanism consisting of a first rotating rod, a first bevel gear, a second rotating rod, and a second bevel gear. This design eliminates the need for an additional motor, achieving energy savings. The rotation of the agitator blades effectively disperses the desiccant, preventing it from caking after absorbing moisture and maintaining its loose, porous state. This significantly improves the desiccant's utilization efficiency and regeneration capacity, ensuring the drying module operates continuously and efficiently. A protective cover protects the transmission components from interference. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a dust concentration monitoring device in a mine according to the present invention; Figure 2 This is a schematic diagram of the second drain valve structure of a dust concentration monitoring device in a mine according to the present invention; Figure 3 This is a schematic diagram of the internal structure of the detection box of a dust concentration monitoring device in a mine according to the present invention; Figure 4 This is a schematic diagram of the dust cleaning component structure of a dust concentration monitoring device in a mine according to the present invention; Figure 5 This is a schematic cross-sectional view of the air inlet pipe of a dust concentration monitoring device in a mine according to the present invention. Figure 6 This is a schematic diagram of the desiccant agitation component structure of a dust concentration monitoring device in a mine according to the present invention; Figure 7 This is a schematic diagram of the stirring blade structure of a dust concentration monitoring device for underground mines according to the present invention.

[0020] In the diagram: 1. Dust concentration monitor; 2. Detection box; 3. Monitoring head; 4. Air inlet pipe; 5. Monitoring air splitting and drying assembly; 51. Splitting pipe; 52. Drying box; 53. Splitting plate; 54. Exhaust fan; 55. Desiccant storage box; 56. Drying air inlet channel; 57. Desiccant storage box; 58. Liquid collection tank; 59. First drain valve; 6. Dust isolation assembly; 61. Air distribution pipe; 62. Booster pump; 63. Air outlet; 7. Desiccant stirring assembly; 71. First rotating rod; 72. First bevel gear; 73. Second rotating rod; 74. Second bevel gear; 75. Stirring blade; 76. Protective cover; 8. Dust cleaning assembly; 81. Motor; 82. Lead screw; 83. Moving block; 84. Cleaning box; 85. Nozzle; 86. Water pump; 87. Liquid pipe; 9. Second drain valve. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 Please see Figures 1-6 This invention provides a dust concentration monitoring device for underground mines, comprising: Dust concentration monitor 1, a detection box 2 is installed at the bottom of dust concentration monitor 1, a monitoring head 3 is located inside the detection box 2 at the bottom of dust concentration monitor 1, an air inlet pipe 4 is fixedly connected to one side of the front of the detection box 2, and an air outlet pipe is provided at the rear of the detection box 2. The monitoring air diversion and drying assembly 5 is located on the front side of the detection box 2. The monitoring air diversion and drying assembly 5 includes a diversion pipe 51, one end of which is connected to the air inlet pipe 4. A drying box 52 is installed at one end of the diversion pipe 51. An exhaust fan 54 is installed on the front side of the inner cavity of the air inlet pipe 4. A desiccant storage mesh box 55 is fixedly sleeved in the inner cavity of the drying box 52. The desiccant storage mesh box 55 contains desiccant. A desiccant storage box 57 is installed on the top of the desiccant storage mesh box 55. A liquid collection bucket 58 is installed at the bottom of the desiccant storage mesh box 55. A dry air intake channel 56 is installed on the rear side of the drying box 52, located on one side of the desiccant storage mesh box 55. The dry air intake channel 56 passes through the detection box 2 and enters the detection box 2.

[0023] The monitoring air diversion and drying assembly 5 also includes a diversion plate 53, which is installed in the inner cavity of the air intake pipe 4.

[0024] By incorporating the monitoring air diversion and drying component 5, a portion of the ambient air is introduced into the drying chamber 52 via the diversion pipe 51 for dehumidification. The dried air then flows back to the detection chamber 2 through the dried air intake channel 56. This structure establishes an active air humidity control mechanism, reducing the humidity of the gas entering the detection area at the source. This effectively prevents condensation or reading distortion of the monitoring head 3 due to high ambient humidity, significantly improving the accuracy and environmental adaptability of dust concentration monitoring. Simultaneously, the liquid collection tank 58 is designed to collect condensate, keeping the system dry.

[0025] By adding a flow divider 53 to the inner cavity of the air inlet pipe 4, the incoming airflow can be distributed more evenly and controllably, ensuring that a predetermined proportion of airflow enters the split drying path stably, avoiding airflow fluctuations from affecting the drying effect and the representativeness of the main detection airflow, thereby making the humidity control of the overall system more stable and reliable.

[0026] Example 2 Please see Figures 3-6 The rear side of the drying chamber 52 is provided with a dust isolation component 6. The dust isolation component 6 includes an air distribution pipe 61, a booster pump 62 and an air outlet 63. The rear side of the drying chamber 52 is equipped with an air distribution pipe 61 located on one side of the dry air intake channel 56. The front side of the air distribution pipe 61 is fixedly sleeved on the front side of the test chamber 2. One end of the air distribution pipe 61 is connected to the booster pump 62, and an air outlet 63 is installed on one side of the booster pump 62.

[0027] This claim adds a dust isolation component 6. Dry air drawn from the air distribution pipe 61 is pressurized by the booster pump 62 and blown out from the air outlet 63, forming a continuous and stable dry air curtain on the surface of the optical sensor of the monitoring head 3. This air curtain physically isolates the direct contact between high-concentration dust and humid air from the outside, fundamentally preventing dust adhesion and moisture condensation, protecting the cleanliness of the core optical components, ensuring the long-term stability of the monitoring signal, and greatly extending the maintenance-free cycle.

[0028] The diameter of the air distribution pipe 61 gradually decreases towards the air outlet 63, and the air outlet of the air outlet 63 faces the bottom of the monitoring head 3.

[0029] The air distribution pipe 61 is designed with a tapered structure whose diameter gradually decreases towards the air outlet 63. This utilizes fluid dynamics principles to increase the airflow velocity and stabilize the pressure during transport, thus ensuring that the air curtain ejected from the air outlet 63 has higher velocity and concentration. Simultaneously, the air outlet 63 is positioned so that it faces the bottom of the monitoring head 3, allowing the drying air curtain to precisely cover the most vulnerable and critical parts of the monitoring head, improving the targetedness and effectiveness of the protection.

[0030] Example 3 Please see Figures 5-7 The inner cavity of the air inlet pipe 4 is provided with a desiccant agitation assembly 7. The desiccant agitation assembly 7 includes a first rotating rod 71, a first bevel gear 72, a second rotating rod 73, a second bevel gear 74, an agitator blade 75, and a protective cover 76. The output end of the exhaust fan 54 is connected to the first rotating rod 71. The second rotating rod 73 is movably sleeved on one side of the desiccant storage mesh box 55. One end of the protective cover 76 is connected to the second bevel gear 74. One end of the first rotating rod 71 is connected to the first bevel gear 72. The external teeth of the first bevel gear 72 mesh with the external teeth of the second bevel gear 74. The protective cover 76 is sleeved on the outside of the first bevel gear 72, the first rotating rod 71, the second bevel gear 74, and the second rotating rod 73, and is connected to the desiccant storage mesh box 55. An agitator blade 75 located in the inner cavity of the desiccant storage mesh box 55 is installed on the outside of the second rotating rod 73.

[0031] This claim integrates a desiccant agitation assembly 7. It creatively utilizes the operating power of the exhaust fan 54 to drive the agitator blades 75 within the desiccant storage box 55 to rotate via a transmission mechanism consisting of a first rotating rod 71, a first bevel gear 72, a second rotating rod 73, and a second bevel gear 74. This design eliminates the need for an additional motor, achieving energy savings. The rotation of the agitator blades effectively disperses the desiccant, preventing it from caking after absorbing moisture and maintaining its loose, porous state, thereby significantly improving the desiccant's utilization efficiency and regeneration capacity, ensuring the drying module operates continuously and efficiently. A protective cover 76 protects the transmission components from interference.

[0032] The second rotating rod 73 is perpendicularly distributed to the first rotating rod 71, and a number of stirring blades 75 are evenly distributed around the second rotating rod 73 on its outer side.

[0033] The second rotating rod 73 is perpendicular to the first rotating rod 71, and the stirring blades 75 are evenly distributed circumferentially. This vertical transmission structure has a compact layout, making it suitable for transmitting power in a limited space. The evenly distributed stirring blades 75 can agitate the desiccant uniformly without dead angles, avoiding local desiccant failure and making the drying process more uniform and efficient.

[0034] Example 4 Please see Figures 3-4 The inner cavity of the test box 2 is equipped with a dust cleaning component 8, which includes a motor 81, a lead screw 82, a moving block 83, and a cleaning box 84. The motor 81 is installed on the front side of the inner cavity of the test box 2. The output end of the motor 81 is connected to the lead screw 82. The outer side of the lead screw 82 is threadedly connected to the moving block 83. The cleaning box 84 is installed on one side of the moving block 83. The front side of the cleaning box 84 is connected to the inner wall of the test box 2 by a telescopic rod. The top of the cleaning box 84 is equipped with a brush.

[0035] This claim adds a dust cleaning component 8. A motor 81 drives a lead screw 82, which in turn moves a moving block 83 and a cleaning tank 84 in a linear motion. The brush on top of the component scrapes the inner wall of the detection chamber 2. This achieves automated physical cleaning of accumulated dust on the inner wall of the detection chamber, replacing inefficient and inconvenient manual cleaning. It can periodically remove settled dust, maintain the cleanliness of the detection chamber, and prevent secondary dust from interfering with measurement results.

[0036] The dust cleaning assembly 8 also includes a nozzle 85, a water pump 86, and a liquid pipe 87. The water pump 86 is installed on the rear side of the liquid collection tank 58. The output end of the water pump 86 is connected to the liquid pipe 87. One end of the liquid pipe 87 is connected to the cleaning tank 84. The nozzle 85 is installed on the top of the cleaning tank 84.

[0037] A wet cleaning system consisting of a nozzle 85, a water pump 86, and a liquid pipe 87 is further integrated. The water pump 86 delivers condensate collected in the liquid collection tank 58 to the nozzle 85 for spraying. This design achieves a wet cleaning process of "first spraying to wet, then scrubbing," resulting in better cleaning of stubborn stains. Simultaneously, the condensate is recycled as the cleaning fluid, reflecting the design's environmental friendliness and resource recycling philosophy.

[0038] The cleaning tank 84 has nozzles 85 on both the front and rear sides of the top, and the brush is located between the front and rear nozzles 85.

[0039] It is confirmed that spray nozzles 85 are installed on both the front and rear sides of the top of the cleaning tank 84, with brushes positioned between them. This "front spraying - middle brushing - rear rinsing" layout constitutes a complete small-scale automated cleaning station. The front spray nozzles 85 pre-wet the dust, the middle brushes perform brushing, and the rear spray nozzles 85 rinse away residual wastewater, making the cleaning process more efficient and thorough, and greatly improving the practical effectiveness of the automatic cleaning components.

[0040] The bottom of the testing box 2 is equipped with a second drain valve 9, and the bottom of the liquid collection tank 58 is equipped with a first drain valve 59.

[0041] A second drain valve 9 is installed at the bottom of the testing chamber 2, and a first drain valve 59 is installed at the bottom of the liquid collection tank 58. This design provides a reliable liquid discharge channel for the equipment. The first drain valve 59 is used to periodically drain the collected condensate or cleaning waste liquid to prevent the liquid collection tank from becoming overfilled; the second drain valve 9 is used to remove any liquid that may accidentally accumulate inside the testing chamber. The dual-valve configuration ensures that any liquid accumulation inside the equipment can be drained promptly and conveniently, fundamentally avoiding problems such as equipment corrosion, short circuits, or bacterial growth caused by liquid retention, and ensuring the long-term stability and safety of the equipment.

[0042] Working principle: When using this device, after the equipment is started, the exhaust fan 54 starts working, drawing in the dusty and humid ambient air from the well through the air inlet pipe 4. The drawn-in air encounters the diverter plate 53 in the air inlet pipe 4 and is divided into two paths. One part of the airflow is used as sample air and directly enters the detection chamber 2, while the other part of the airflow is guided into the drying chamber 52 through the diverter pipe 51. The airflow passes through the desiccant storage mesh box 55 containing desiccant, where the moisture is absorbed by the desiccant and becomes dry air. During the drying process, the condensed water drips down into the liquid collection tank 58 for storage. The dried air is transported back into the detection chamber 2 through the dried air intake channel 56, where it mixes with the directly entering wet sample air. By controlling the flow ratio, the system can actively stabilize the air humidity in the detection chamber 2 at a low level, creating an ideal low-humidity detection environment for the monitoring head 3 and fundamentally preventing the optical lens from failing due to condensation. The dust concentration monitor 1 controls the monitoring head 3, which is usually an optical sensor, such as a laser scattering instrument, to detect the mixed airflow. Since the humidity is controlled, the scattering signal of the dust particles to the light is not affected by water vapor, and the monitor can calculate high-precision dust concentration data. The detected exhaust gas is discharged from the exhaust pipe at the rear of the detection box 2. While monitoring, the equipment activates its active protection mechanism. A portion of the dry air from the drying chamber 52 enters the air distribution pipe 61. Because the air distribution pipe 61 is tapered, the airflow is accelerated during transport. The accelerated dry airflow is further pressurized by the booster pump 62 and finally blown out at a high speed from the outlet 63. The outlet of the outlet 63 is precisely oriented towards the bottom of the monitoring head 3. This continuous, dry, and clean airflow forms an invisible "air curtain" on the surface of the optical window of the monitoring head 3. It effectively disperses dust particles attempting to approach and prevents humid air from directly contacting the cold lens, thus achieving the dual purpose of dust prevention and condensation prevention. The equipment integrates automatic maintenance functions to ensure long-term effective operation. The desiccant agitation component 7 is linked to the exhaust fan 54. When the exhaust fan 54 is working, its output shaft drives the first rotating rod 71 to rotate.

[0043] Through the meshing of the first bevel gear 72 and the second bevel gear 74, the power is converted into a vertical direction, driving the second rotating rod 73 to rotate. The stirring blade 75 on the second rotating rod 73 rotates accordingly, continuously agitating the desiccant in the desiccant storage mesh box 55, breaking up the caking caused by moisture absorption, exposing the undiminished desiccant inside, and maintaining a high-efficiency moisture absorption capacity. When cleaning is required, the dust cleaning assembly 8 is activated. Motor 81 drives lead screw 82 to rotate, causing moving block 83 and cleaning tank 84 to move horizontally along the guide rail. Simultaneously, water pump 86 starts, pumping condensate stored in liquid collection tank 58 into cleaning tank 84 through liquid pipe 87, and spraying it out from nozzle 85 in a forward-backward direction. During movement, the brush on top of cleaning tank 84 performs a "spray-brush-re-spray" process, automatically cleaning the inner wall of testing tank 2 to prevent dust accumulation. The wastewater after cleaning, along with the condensate collected during normal operation, can be centrally discharged through the first drain valve 59 at the bottom of liquid collection tank 58 and the second drain valve 9 at the bottom of testing tank 2, keeping the inside of the equipment dry.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dust concentration monitoring device for underground mines, characterized in that, include: A dust concentration monitor (1) is provided with a detection box (2) installed at the bottom of the dust concentration monitor (1). A monitoring head (3) is located inside the detection box (2) at the bottom of the dust concentration monitor (1). An air inlet pipe (4) is fixedly connected to one side of the front of the detection box (2). An air outlet pipe is provided at the rear of the detection box (2). The monitoring air diversion drying assembly (5) is set on the front side of the detection box (2). The monitoring air diversion drying assembly (5) includes a diversion pipe (51). One end of the diversion pipe (51) is connected to the air inlet pipe (4). A drying box (52) is installed on one end of the diversion pipe (51). An exhaust fan (54) is installed on the front side of the inner cavity of the air inlet pipe (4). A desiccant storage mesh box (55) is fixedly sleeved in the inner cavity of the drying box (52). The desiccant storage mesh box (55) contains desiccant. A desiccant storage box (57) is installed on the top of the desiccant storage mesh box (55). A liquid collection bucket (58) is installed on the lower part of the desiccant storage mesh box (55). A dry air intake channel (56) is installed on the rear side of the drying box (52) on one side of the desiccant storage mesh box (55). The dry air intake channel (56) passes through the detection box (2) and enters the detection box (2).

2. The dust concentration monitoring device for mines according to claim 1, characterized in that, The monitoring air diversion and drying assembly (5) also includes a diversion plate (53), which is installed in the inner cavity of the air intake pipe (4).

3. The dust concentration monitoring device for mines according to claim 1, characterized in that, The drying chamber (52) is provided with a dust isolation component (6) at the rear. The dust isolation component (6) includes a distribution pipe (61), a booster pump (62) and an air outlet (63). The drying chamber (52) is provided with a distribution pipe (61) located on one side of the dry air intake channel (56). The front side of the distribution pipe (61) is fixedly sleeved on the front side of the test box (2). One end of the distribution pipe (61) is connected to the booster pump (62). An air outlet (63) is installed on one side of the booster pump (62).

4. The dust concentration monitoring device for mines according to claim 3, characterized in that, The diameter of the air distribution pipe (61) gradually decreases towards the air outlet (63), and the air outlet of the air outlet (63) faces the bottom of the monitoring head (3).

5. The dust concentration monitoring device for mines according to claim 1, characterized in that, The inner cavity of the air inlet pipe (4) is provided with a desiccant agitation assembly (7), which includes a first rotating rod (71), a first bevel gear (72), a second rotating rod (73), a second bevel gear (74), an agitator (75), and a protective cover (76). The output end of the exhaust fan (54) is connected to the first rotating rod (71), and the second rotating rod (73) is movably sleeved on one side of the desiccant storage mesh box (55). One end of the protective cover (76) is connected to the second bevel gear (74). 4) One end of the first rotating rod (71) is connected to the first bevel gear (72), the external teeth of the first bevel gear (72) mesh with the external teeth of the second bevel gear (74), the protective cover (76) is sleeved on the outside of the first bevel gear (72), the first rotating rod (71), the second bevel gear (74) and the second rotating rod (73), and is connected to the desiccant storage mesh box (55), and the outside of the second rotating rod (73) is equipped with a stirring blade (75) located in the inner cavity of the desiccant storage mesh box (55).

6. The dust concentration monitoring device for mines according to claim 5, characterized in that, The second rotating rod (73) is perpendicular to the first rotating rod (71), and the outer side of the second rotating rod (73) is provided with a number of stirring blades (75) evenly distributed along the circumference of the second rotating rod (73).

7. The dust concentration monitoring device for mines according to claim 1, characterized in that, The inner cavity of the test box (2) is provided with a dust cleaning component (8). The dust cleaning component (8) includes a motor (81), a lead screw (82), a moving block (83), and a cleaning box (84). The motor (81) is installed on the front side of the inner cavity of the test box (2). The output end of the motor (81) is connected to the lead screw (82). The outer side of the lead screw (82) is threadedly connected to the moving block (83). The cleaning box (84) is installed on one side of the moving block (83). The front side of the cleaning box (84) is connected to the inner wall of the test box (2) by a telescopic rod. The top of the cleaning box (84) is provided with a brush.

8. The dust concentration monitoring device for mines according to claim 7, characterized in that, The dust cleaning assembly (8) also includes a nozzle (85), a water pump (86) and a liquid pipe (87). The water pump (86) is installed on the rear side of the liquid collection tank (58). The output end of the water pump (86) is connected to the liquid pipe (87). One end of the liquid pipe (87) is connected to the cleaning tank (84). The nozzle (85) is installed on the top of the cleaning tank (84).

9. A dust concentration monitoring device for underground mines according to claim 8, characterized in that, The cleaning tank (84) is equipped with nozzles (85) on both the front and rear sides of the top, and the brush is located between the front and rear nozzles (85).

10. A dust concentration monitoring device for underground mines according to claim 1, characterized in that, The bottom of the detection box (2) is equipped with a second drain valve (9), and the bottom of the liquid collection tank (58) is equipped with a first drain valve (59).

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