The principle of the fog cannon machine: the water mist sprayed by the fog gun machine is micron-level water mist. It is produced by a special micron-level spray unit under different pressure and flow control of water and air. The mist particles are mutually exclusive and independent, which improves the combination with dust. The fog gun machine is based on the principle of air delivery. First, the imported high-pressure pump and the fine atomizing nozzle are used to atomize the water, and then the air volume and pressure of the fan are used to send the atomized water mist to a longer distance, so that the water mist reaches a longer distance. At the same time, it can cover a larger area, and the water mist and dust will fall after condensation, so as to achieve the purpose of dust reduction. At present, in many open-air stockyards and operation sites, operation dust and local fugitive dust are difficult problems in dust management. In the past, many companies used water spraying measures, but the small coverage area and large water consumption made the water spraying treatment effect extremely unsatisfactory.