Failure Analysis Method of Diaphragm Coupling

　　Coupling is a mechanical part that connects the driving part and the driven mechanism to rotate together and transfer energy and movement.Couplings can be divided into rigid couplings and elastic couplings. Rigid couplings are usually used in low-speed and heavy-duty situations, and their main function is to transmit larger power; while elastic couplings are mainly used for high-speed rotors. The system uses elastic elements or specific structures to adjust and compensate for misalignment caused by manufacturing, installation and temperature changes. At the same time, general elastic couplings have the function of vibration isolation. In 1982, my country's high-power high-speed diaphragm flexible coupling was successfully tested in Southern Power Company. This type of coupling has become a hot spot in the domestic engineering community due to its good performance.
　　The diaphragm coupling has no need for lubrication, long service life, and large compensation capabilities.It transmits torque through flexible steel sheets, and has angular, axial, and radial displacement compensation capabilities and shock absorption.The diaphragm is easy to assemble and disassemble, without lubrication, and can be ideally applied to various working conditions.
　　Diaphragm couplings are favored by construction machinery and rolling machinery because of their superior performance. Although diaphragm couplings are durable, they can fail or even become scrapped due to various reasons. Therefore, it is of great significance to study the causes of failure.Diaphragm damage is the main form of coupling failure, which is a bad diaphragm ring.The fault tree analysis method is a common and practical system reliability analysis method in engineering. This method is simple, intuitive and flexible, and is suitable for failure analysis of diaphragm couplings.The author will use this analysis method to analyze the failure mechanism of the diaphragm coupling according to the specific failure mode of the diaphragm coupling in the engineering practice.