The measurement of the coupling and the beating of the coupling in the maintenance of the turbine is an important task.
During the overhaul, it is found that the coupling jump exceeds the standard. Through dynamic balance, the mass imbalance caused by the center can be balanced. If the rigid coupling is over-standard, when the bolt is tightened, the other side of the journal will increase. Vibration occurs in the running state.
The method of processing the scoring on the spot is to use a standard flat shaving. Another method is to use the uneven heating to cause the expansion of the component to correct the scoring.
The specific method is to rotate the coupling plane to the upper part, and then heat it along the arc at the maximum value of the positive value and the other end of the coupling, that is, the round surface near the root of the coupling. . The end face of the coupling at the negative value is heated in a zigzag pattern. Heat at the same time. The coupling is expanded, and the weight is corrected by its own weight or suspended weight. During the heating process, the dial gauge can be used to monitor the change.
The coupling is used to connect the turbine rotor and the generator rotor with the main oil pump oil supply lubrication system and the adjustment system, and mainly transmits the rotational torque. Since the coupling rotates at a high speed with the turbine rotor, it is subjected to a large centrifugal force. One end of the original spring-plate type flexible coupling is fixed by two bolts of the flange, sandwiched between the turbine rotor flange and the coupling flange, or between the oil pump main shaft, and has a certain amount of displacement in the axial direction. During operation, due to some deviation between the center of the turbine rotor and the center of the coupling, and the slight unevenness of the expansion of the main shaft or other reasons, the spring piece may cause a large shear force, and the spring piece is subjected to the twisting stress. Therefore, it is easy to break. After the spring piece breaks, the axial gap is more uneven, and the left and right opening deviation is large. After reaching a certain theoretical degree of design, the flange on one side of the coupling is short and the cover is rubbed for a short time. The bolt breaks and then breaks. After changing to the toothed sleeve type, it has the following advantages: the rotor is allowed to have a large center deviation when it expands; the large rotating torque of the steam turbine generator can be smoothly transmitted; the shaft displacement can be well absorbed when the spindle expands; each rodent Evenly, the force between the teeth and the teeth is relatively uniform, which reduces the vibration in the transmission.
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