Tube expansion prevention device of tubular belt conveyor

The utility model discloses a tubular belt conveyor tube expansion prevention device which comprises a flow guide plate and a flow limiting plate, a hinge shaft is arranged at the top end of the flow limiting plate, the two ends of the hinge shaft are hinged to fixed lifting lugs, and an adjusting screw rod used for adjusting the inclination of the flow limiting plate is arranged at the lower end of the flow limiting plate. The pipe expansion prevention device is arranged on the chute tube, the inclination degree of the flow limiting plate is changed through the adjusting screw rod, then the cross sectional area in the chute tube is flexibly changed, it is guaranteed that the material amount in the chute tube is within the rated range of the tubular belt conveyor all the time, and pipe expansion faults caused by the fact that excessive materials enter the tubular belt conveyor are effectively avoided; equipment property loss is avoided, and safe and stable operation of production operation is guaranteed; in a