旋转机械的联轴器找正（Coupling alignment of rotating machinery）.doc

旋转机械的联轴器找正（Coupling alignment of rotating machinery） The alignment of the coupling is one of the important tasks of machine installation. The purpose is to find it in the machine at work when the driving shaft and the driven shaft axis center line in the same line. Looking for the accuracy related to whether the normal operation of the machine, the high speed operation of the machine is especially important. Two absolute accuracy is difficult to achieve in the continuous operation of the machine keep accurate on the even more difficult. All the parts of the uneven thermal expansion, shaft deflection, bearing uneven wear, displacement and base machine generated by uneven subsidence, are caused by the reasons is not easy to maintain on the axis. Therefore, in the design of the machine provides two axis center has a allowable deviation, which is needed to install the coupling. From the perspective of the assembly, as long as to ensure safe and reliable coupling to transmit torque, deviation of axis center allows the greater the value, more easy to reach the installation requirements. But from the point of view of installation quality, the smaller the center deviation of the two shafts, the more accurate the machine is, the better the operation of the machine, and the longer the service life. Therefore, when the coupling is not installed, the allowable deviation between the two shafts is regarded as the allowance left by the purchaser in the construction of the coupling. 1. the analysis of two axis deviation when the coupling is alignment When the machine is installed, the coupling will be in the axial and radial deviation or tilt, there may be four cases, as shown in figure 1. Fig. 1 four situations that may occur when the coupling is correct As shown in Fig. 1, an analysis of the relative positions of the drive shaft and the driven shaft is shown in table 1. Table 1 Analysis of coupling deflection 2. measurement method When the machine is installed, it is usually fixe