The composition of the JM diaphragm coupling

The diaphragm coupling is also known as the steel sheet flexible coupling or the laminated sheet flexible coupling. This type of coupling mainly achieves vibration reduction and angular, axial and lateral displacement compensation through elastic diaphragms. The diaphragm coupling is mainly composed of metal flexible diaphragm groups, left and right half couplings, connecting bolts and other components. The diaphragm assembly is composed of a number of stainless steel-coated diaphragms stacked together and alternately fixed to the driving end and the driven end by bolts. The thickness of the diaphragm is generally 0.2 to 0.6mm, and the main shape of the diaphragm is the circular ring type. Wheel spoke type, connecting rod type, multi-sided type and waistband type. In actual engineering, double diaphragm group couplings with intermediate shafts are often used. This type of diaphragm coupling has a compensating effect on parallel misalignment and angular misalignment that occur in the system. The working principle is as follows: During operation, the torque is input from the left half coupling and transmitted to the metal diaphragm through the driving torque transmission bolts arranged at intervals along the circumference. Then, the diaphragm transmits the torque to the right half coupling for output through the driven bolts. It achieves the flexible transmission of the coupling through the elastic deformation of the alloy diaphragm group, and utilizes the flexibility of the diaphragm to absorb the relative displacement between the input and output shafts, thereby compensating for the residual misalignment of each connection part of the transmission shaft system caused by various factors.

The vulnerable part of the diaphragm coupling is the diaphragm assembly. The service life of the diaphragm assembly determines the service life and working speed of the coupling. Domestically produced diaphragm couplings have corresponding gaps compared with other products in terms of appearance quality, service life and other aspects. From the actual damaged diaphragm group and theoretical analysis. It can be known that the damage of the diaphragm assembly mainly occurs near the hinge points of the diaphragm assembly. This is because when there is angular displacement or axial displacement between the power machinery and the working machinery, the diaphragm group in the diaphragm coupling connecting the power machinery and the working machinery will generate additional stress. When the diaphragm coupling is in operation or in a state of repeated forward and reverse rotation, the diaphragm group is subjected to alternating stress and is prone to fatigue failure.

The torque borne by the diaphragm

When the diaphragm coupling transmits torque, the torque is generated by the driving bolt using the diaphragm element to drive the driven bolt, resulting in tensile and compressive forces along the tangential direction of the bolt distribution circle within the diaphragm. Torque causes the tensile or compressive stress generated by the diaphragm to vary with the working conditions, but under operating conditions, it can be regarded as constant stress.

Forced displacement of the diaphragm group

Although the torque transmitted by the diaphragm assembly during the operation of the diaphragm coupling is considerable, practice has proved that the main failure of the diaphragm coupling is not caused by the insufficient torque transmission capacity of the diaphragm assembly, but by the alternating cyclic composite stress on the diaphragm. And this kind of compound stress is mostly caused by the additional load resulting from the misalignment of the two shafts connected by the diaphragm coupling.