Abstract: If the dust generated during excavation operations cannot be diluted and discharged in a timely manner,it is easy to accumulate and cause great harm to the physical health of the workers. A combined device for supplying and measuring the air volume of local ventilation fans suitable for metal mines has been developed and tested on a -300 m horizontal exploration single end mining face in a gold mine in Shandong Province. The test results show that after the introduction of this device, as the excavation operation progresses,without changing the original number and model of local ventilation fans,the dust exhaust wind speed of the working face is always maintained at around 0. 36 m / s by controllable compensation of the air pressure and air volume in the air duct,meeting the relevant ventilation requirements of the Safety Regulations for Metal and Non-metal Mines (GB 16423-2020). This device realizes the integration of local ventilation fan air supply and measurement,effectively solving the problems of reduced air volume delivered to the working face through flexible air ducts due to longer excavation distance and increased ventilation resistance,as well as low safety and accuracy of air volume measurement. It is of important significance for improving the underground working environment and ensuring the safety production of metal mine single head excavation.

Key words: mine ventilation,local ventilator,air supply,wind pressure measurement,output air volume