### Dustproof Technology
The special \"fan\" inside the vortex air duct is used to change the air flow at the outlet of the press-in air duct from the axial air supply to the radial air supply, forming a very uniform spiral air flow toward the working face along the entire roadwaysection. The high-concentration dust on the surface is confined to the vicinity of the driving head, allowing the dust collector to work efficiently. The composite dust collector utilizes a high-speed rotating rotary atomizer to atomize the water flow to form a water curtain, purify the dust-laden air flow that is drawn in, and the purified air flow is adapted into a rotating air flow through the cyclone to generate a strong centrifugal force to remove the water and dust. The mixture is directed to the walls of the vessel again for dust removal and dewatering. In recent years, some research has been conducted on the use of dust collecting drums for dust removal in China. This method takes advantage of the high-pressure water as the driving force for airflow movement. Several dust-collecting tubes are evenly arranged around the drum, and high-pressure water nozzles are installed at one end of the dust-collecting tubes. The water spray in the dust collecting pipe drives the flow of air, so that the air flows from the coal wall side through the dust collecting pipe to the other side of the drum. After the air flow passes through the drum, the air flow and water flow out along the gap between the end face edge of the drum and the baffle plate, and part of the air flow returns to the dust collection pipe along the drum surface to participate in the circulation again, while the other part is taken away by the wind flow on the working face. A good ventilation system can significantly reduce the dust concentration on the excavation face and reduce dust hazards, which is one of the necessary conditions to ensure the normal production of coal mines. At present, the main forms of common ventilation and dust reduction technologies include: (1) extraction ventilation and dust reduction; (2) dilution dust reduction; (3) dual air flow branch ventilation system for dust reduction; (4) dust reduction measures such as pressure and suction mixed type and the best dust exhaust wind speed. Ventilation and dust removal is the use of air flow to control the diffusion of dust. Domestic scholars have proposed the use of \"invisible transparent barrier\" air curtains to control the diffusion of dust and have carried out related applications. The former Soviet Union's Central Academy of Mining Machinery and the Skoczynski Institute of Mines jointly researched the press-in and extraction type ventilation and dust removal equipment for fully mechanized excavation working faces, whose working principle is to form a dust-proof air curtain near the working surface to prevent the dust from spreading outward, and then use the suction pipe to extract the dust-laden air. Germany adopts the equipment with wall-mounted air ducts to turn the axial air flow along the roadway into a spirally propelled uniform rotating air flow, forming an air curtain, squeezing the dust of the excavation working face in front of the head to form high-concentration dust, and then using the fan to remove the dust into the dust collector for treatment. In the UK, comprehensive dust prevention measures such as air curtains (located between the driver and the roadheader), dust collectors and extractive dust removal fans have also achieved certain dust reduction effects. (5) Chemical dust suppression  
According to the experiments conducted, almost all coal dust is featured with a certain degree of hydrophobicity, coupled with the large surface tension of water. Often the capture rate of dust with the particle size of below 2 um is lower than 28%. With the dust suppressant, the wettability of the aqueous solution to the dust can be greatly increased.