Different degrees of damage to the mechanical structure of the diaphragm coupling

When the load acts on the mechanical structure for a high number of repeated cycles, the mechanical structure will be 

in a high-cycle fatigue state, and fatigue damage will often occur in the mechanical structure. The mechanical structure 

of the diaphragm coupling may be damaged to varying degrees under random environments such as temperature and 

load. Fatigue damage refers to the damage to the mechanical properties of the materials constituting the mechanical 

structure when the mechanical structure is subjected to cyclic stress. The stress concentration coefficient is used to 

describe the fatigue of the mechanical structure or component materials.

The diaphragm coupling is equipped with a steel ball universal mechanism device at each end of the middle section.

The steel ball universal mechanism consists of a shell, steel balls and a transmission shaft. There are six ball sockets at 

both ends of the outer circle of the transmission shaft, and the outer circles at both ends match the housing. The 

transmission shaft and the housing have a clearance fit. There are six arc-shaped grooves on the inside of the shell, 

which match six ball sockets and contain six steel balls. The axial position of the transmission shaft will rotate slightly, 

driving the steel ball to roll slightly in the slideway of the housing.

The micro-rolling of the steel ball realizes the universal function of the coupling, which is used to compensate for the 

position offset between the motor shaft and the pump shaft. It has high surface wear resistance. Finally, in order to 

increase the corrosion resistance of the material, surface development is carried out. Black treatment, blackened 

treatment. A stable protective film is formed on the surface of the steel to prevent the steel from rusting. The steel 

balls are in complete contact with the concave ball socket and slideway when the coupling is running.

There is no need for alignment during installation. The bolts need to be tightened to offset the position between the 

two axes, which is compensated by the steel ball universal mechanism. The connecting plate stop is positioned in 

conjunction with the two half-shaft sections to ensure the coaxiality of the connecting plate and the half-shaft sections. 

The diaphragm structure is designed in a flower shape, which strengthens the torsional stiffness of the diaphragm and 

increases the elastic deformation of the diaphragm,thereby making the coupling have a greater vibration damping 

effect. While ensuring surface roughness, it also meets the requirements for coaxiality and verticality.