According to the vibration condition of the unit, the shutdown inspection process was decided. The self-positioning of the No. 4 watt and the tightness and clearance were normal. The low-pressure rotor blades and the balance block did not loosen off and the No. 4 shaft vibration probe had no problem. However, the short-axis coupling between the low-profile coupling bolts is extremely uneven, and most of the bolts can be tightened again, and several bolts are tightened by about 30 degrees.
After adjusting the tightening force of the bolts, the abnormality of the No. 4 shaft vibration disappears during the process of the cranking, but when the unit speed reaches 3000r/min, the vertical direction of the No. 4 wattage is 102m, and the No. 5 shaft vibration is 234m, due to the No. 4 wattage vibration The shaft vibration of No. 5 was seriously exceeded, and it was decided to carry out on-site dynamic balance treatment. After the low-pressure rotor and the low-rise connecting pair were added, the vibration of each bearing was less than 50m at 3000r/min, and the shaft vibration of the unit when the grid was connected with load. They are all within 76m, which has achieved the best level of vibration since the machine was put into production.
Insufficient tightening force of the wheel of the wheel or the sway of the shaft of the exciter is insufficient. The insufficient tightening force of the wheel bolt often results in the sway of the No. 7 journal at the static state of the overhaul, but the tightening force of the bolt changes during the rotation of the unit. The performance of the No. 7 shaft vibration is abnormal. When the machine is stopped for review, the sway at the No. 7 journal has changed, even exceeding the standard.
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