The structure and working principle of rotating blades regulating mechanism for axial fans with adjustable blades were presented

and the difference between hydraulic system in domestic regulation mechanism and that in imported regulation mechanism was pointed out

taking boiler fans in supercritical 4×600MW units of Fujian Huadian Kemen Power Plant as the example.The main problem was that

during the operation of actuator in axial fans with adjustable blades manufactured by Shenyang Blower Factory

the rotating blades moved slowly and lagged behind the actuator

and the regulating arm will drop off.The relief valve failure

hydraulic cylinder leakage

low oil pressure resulted from low set value of regulating oil pressure

as well as the insufficient regulating torque were considered as the main reasons.Common regulating failures and their causes for this type of fans were summarized

and the determination methods for each fault were put forward.