Due to various causes of faults mine fan for many reasons, the main cause of failure analysis bearing shock: bearing box severe vibration K40-20 # main fan, air inlet and the impeller housing or rubbing K40-23 # main fan impeller rivets loose or deformed casing and impeller bracket bearing housing and bracket, bearing cover on the seat, such as loose coupling bolts. So when in use can be based on a failure to determine the fault. Mine environmental requirements for a local fan, altitude ≤1000m, when more than 1000 m, derating selection; 2, temperature: -5 ℃ ~ + 40 ℃; 3, the annual average ambient air relative humidity: 95% ~ 98% (25 ℃ when); 4, suitable for mine methane and other gases with air to form explosive mixtures; 5, tilt and horizontal installation of ≤15 degrees; 6, in the absence of a significant shake and severe shock and vibration place; 7, in place to prevent dripping; 8, installation category; for class Ⅲ; 9, pollution levels: for three. K40-18 # main fan | Main Ventilator | provided by Zibo Zibo Blower Fan Factory Limited. Zibo Blower Factory Co., Ltd. (www.zibo-fengji.com) strong, credible, Shandong Zibo fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Zibo Blower and you hand into the brilliant, for a better future!