Quick reverse ventilation of the main ventilation fan

The existing mines are equipped with independent and complete ventilation systems, with many ventilation methods and main ventilation fan working methods. Regardless of Which ventilation method and the main working method of the ventilation fan? Both the main and backup mine ventilation fans need to be switched once a month for preventive maintenance of the mechanical and electrical parts of the mine main fan. The main/backup mine ventilation fan switching is now manually completed. Due to the time required for switching the main/backup mine ventilation fans, there are the following issues: (1) During the shutdown process, there must be a period of time when there is no wind underground, which can easily cause the mine gas to exceed the limit; (2) Due to the standby ventilation fan being in a cold standby state, that is, after the running ventilation fan stops running, the standby ventilation fan can be restarted. If the standby ventilation fan is in a cold standby state…