Treatment of Vibration caused by defects in connection between Fan Impeller and Hub

The connection mode between fan impeller and hub is rivet connection and hinge hole bolt connection. Normally, the fit of fan impeller and hub adopts interference fit, and the pretightening force of rivet or hinge hole bolt meets the technical requirements. However, there are still a small number of fans in this respect did not meet the requirements, causing slight loosening and resulting in vibration, this situation is generally taken to re-rivets or pre-tightening, if still not meet the requirements, only to replace the impeller. The circulating fan of cement plant has vibration because the nut wear of the hinge hole bolt is too big, which causes the impeller and wheel hub to have insufficient pretightening force. The main reason is that the inner circulation wind is produced inside the air duct, which results in too much wear of the nut. First, the air duct structure is improved to eliminate the internal circulation air; secondly, the hinge hole bolt is replaced and the fastening bolt of the torsion wrench is used to achieve the same pretightening force; the important point is to strengthen the inspection and check to prevent the further expansion of the fault.http://www.jnblower.com/