The gear couplings in the rough rolling area often fail. The failure process is tooth surface contact fatigue, tooth surface spalling, 

abrasive wear, abrasive wear, and the working conditions of the gear couplings in the rough rolling unit and the intermediate 

finishing rolling unit. The shaft intersection angle of the gear coupling changes when the roller diameter changes and during the 

rolling process. The failure mode of the gear coupling is excessive wear. Increasing the tooth surface hardness can improve the 

wear resistance. The gear coupling can compensate for the radial, axial, angular and comprehensive displacement between the two 

shafts, and can transmit a wide range of torque. The tooth surface of the outer sleeve is worn into a concave shape along the axial 

direction. The internal and external teeth have been bitten, and the axial direction cannot relative movement.

The tooth surface wear of the gear coupling cannot eliminate the axial displacement of the turbine rotor and accelerates the wear 

of the thrust bearing of the main oil pump. Improper adjustment of the gear coupling oil seal clearance during unit maintenance is 

also one of the factors causing coupling wear. The high-pressure exhaust hole on the upper part of the main oil pump is enlarged 

from a diameter to a diameter of , and the oil supply amount is variable. Lead an oil pipe from the oil inlet hole of the bearing seat 

through the front box dial to the lower part of the central bearing oil seal. Additional oil can be supplied to the left and right sides. 

During installation, the oil seal clearance of the gear coupling should be well controlled, and the teeth of the gear coupling jacket 

should be properly controlled. The surface is worn along the axial direction and becomes concave, the internal and external teeth 

have been bitten, and the relative movement in the axial direction cannot be achieved.

The motor drives the drive shaft to rotate and transmit torque through the synchronous belt. Two reducers are connected on both 

sides of the drive shaft through rigid couplings. The drive shaft is fixed by two seated bearings on the left and right. The seated 

bearings are fixed to the bearing seat through bolts. On the machine, it is necessary to adjust the installation position and axis 

deviation of the three axes of the left reducer input shaft, drive shaft, and right reducer input shaft. The ordinary installation and 

adjustment method is to install the drive shaft, install the left reducer, install the right reducer, and then adjust the front, rear, left, 

right and up and down positions of the two speed reducers on the left and right bolts, and then cooperate with the debugging of 

the seated bearing on the drive shaft to achieve the design. Deviation requirements.

After processing the left and right holes, cut them apart from the middle. When installing, use a split installation, which is equal to 

the diameter of the input shaft of the reducer and the diameter of the left end of the drive shaft, so that it can be interchanged with 

the coupling. Because the holes at both ends of the clamp are precision machined, at least the holes at the left and right ends have 

a coaxiality of level 7 or above. They are transitionally matched with the shaft and fastened with bolts. The rigid connection of the two 

positioning sleeves ensures that the left and right sides are Reducer input shaft coaxiality requirements. The working methods and 

purposes of general paired gear pairs are different. The paired gear pairs rely on the teeth of the driving gear to drive the teeth of the 

passive gear to continuously mesh to transmit motion and power.