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The coupling is an important component in chemical processing equipment such as centrifugal pumps, fans, and centrifugal compressors; it connects the drive motor to the equipment, transfers torque, and ensures that the drive motor and the equipment rotate synchronously. Coupling alignment ensures that the coaxiality deviation between the axis of the driving machine and the axis of the driven machine remains within acceptable limits. Today, we will share with you the methods and principles for aligning couplings. https://image.juhecat.com/wp-content/uploads/2020/06/u27835049842406851907fm26gp0.jpg?x-oss-process=image%2Fformat,webp The principle of coupling alignment can be divided into the feeler gauge method and the dial indicator method; the former is simple to use but has lower precision, and can be used for rough adjustment. The dial indicator method involves treating the circular surfaces at both ends of the coupling as a perfect circle, and by using four measurement points to determine the radial and axial gaps, the spatial configuration can be identified. This method offers high accuracy and excellent alignment results, but it is rather complicated to implement in practice. The two-table method for aligning couplings: https://image.juhecat.com/wp-content/uploads/2020/06/WechatIMG723-e1592896462583.png?x-oss-process=image%2Fformat,webp. The two-mark method involves using a centering tool and a dial indicator to measure the radial and axial gaps between the two halves of the coupling. When using this method, while measuring the radial gap at a certain location, the axial gap at that same location is also measured simultaneously. During measurement, fix the dial indicator on the micrometer block attached to the driven shaft coupling, so that the dial indicator rotates together with the coupling. When the table is rotated to the 0°, 90°, 180°, and 270° positions, two dial indicators each provide the radial offset and axial runout data a1, a2, a3, a4 and s1, s2, s3, s4. If a1+a3=a2+a4 and s1+s3=s2+s4, then the next phase of finding the positive value can proceed; otherwise, further measurements are required. Subsequently, the type of offset of the coupling can be determined based on the deviations of the four sets of data. The three-gauge method: https://image.juhecat.com/wp-content/uploads/2020/06/WechatIMG725.png?x-oss-process=image%2Fformat,webp. This method also makes use of a dial indicator and micrometers to measure the radial and axial gaps in the two halves of the coupling. As opposed to the two-gauge method, an additional micrometer is used to measure the axial gap; in total, three micrometers are employed to measure both the radial and axial gaps in the coupling. The three-gauge alignment method involves using two micrometers at the coupling’s end faces to measure the axial gaps on opposite sides, thereby eliminating any movement that may occur as the shaft rotates. The data from these two micrometers are combined into a single set of values, which improves the accuracy of the measurements. In summary, compared to the two-table method, the three-table method for alignment can eliminate the errors caused by axial movement, offering higher accuracy in alignment with smaller misalignment errors; however, the alignment process using the three-mark method is more complex. The choice of coupling alignment method should be determined based on the accuracy requirements for equipment operation.