Induced draft fan capable of being used for drying cellulose and high in safety coefficient

The utility model relates to an induced draft fan with high safety factor for cellulose drying, which comprises a mounting plate, an induced draft fan shell is fixedly arranged on one side of the upper end face of the mounting plate, fan blades are arranged in the induced draft fan shell, a rotating shaft is arranged in the fan blades, and a fan blade is arranged in the rotating shaft. A first belt pulley is fixedly arranged at one end of the rotating shaft, an adjusting frame is fixedly arranged on the upper end face of the mounting plate and located on one side of the induced draft fan shell, a motor is arranged at the upper end of the adjusting frame, a second belt pulley is arranged at the output end of the motor, and a belt is arranged on the first belt pulley and the second belt pulley. A mounting frame is fixedly arranged on the lower end face of the motor, sliding grooves are formed in the two side faces of the mounting frame, a vertical plate is correspondingly arranged on the upper end face of the a