Introduce:

The diaphragm is the weak link of the coupling, take a piece of diaphragm to analyze its force condition. When the torque is transmitted, part of the diaphragm is under tension, part of the diaphragm is under pressure, the diaphragm group 1 is stretched, and the diaphragm group 2 is compressed and relaxed. When the coupling rotates at high speed, the centrifugal force generated by the mass of the diaphragm, bolts and washers makes all the diaphragms evenly tensioned. When compensating the axis l sentence and angular displacement, the diaphragm will be bent and deformed, and there will be bending stress in the diaphragm.

Stiffness analysis of diaphragm coupling:

The diaphragm coupling inevitably has installation errors such as axial deviation, angular misalignment, and radial misalignment. The influence of various installation errors on the mechanical properties of the diaphragm coupling will be analyzed below. Assuming that the axial error ΔKa of the diaphragm coupling is 3mm, the radial error ΔKr is 0.15mm, and the angular error ΔKw is 0.5°, the axial and angular installation errors have a great influence on the comprehensive displacement of the diaphragm coupling, while The influence of radial error on the comprehensive displacement is relatively small. Since the large value of the equivalent stress of the diaphragm coupling appears at the bolts of the outer ring, it is mainly caused by the pre-tightening force of the bolts. The installation error has little influence on the large value of the equivalent stress, but the installation error has little effect on the equivalent stress of the diaphragm group and its The distribution law has a great influence.

(1) Considering the bolt pretightening force, torque, centrifugal force and other loads, the calculation model of the diaphragm coupling was established, and the influence of installation errors on the mechanical properties of the diaphragm coupling was studied through contact finite element analysis.

(2) The equivalent stress values of each diaphragm are quite different, the diaphragm stress at both ends is large, the middle diaphragm decreases in turn and the distribution is relatively uniform, and the influence of centrifugal force on the diaphragm stress is more obvious.

(3) Installation errors such as axial deviation, radial misalignment, and angular misalignment have a greater impact on the comprehensive displacement and equivalent stress of the diaphragm group, among which the angular error has a greater impact, and the angular error should be strictly controlled during installation .

Summarize:

If the axial displacement △K of the coupling is known. and the angular displacement △K, the axial and angular restoring force of the film ridge can be obtained, so that the axial deformation stiffness and the bending stiffness during angular deformation can be obtained. This paper mainly analyzes the torsional stiffness of the coupling. When the torque is delivered, the diaphragm is elastically deformed under force, which causes a small elastic hysteresis difference in the diaphragm coupling. The stress of the diaphragm T is the nominal torque, r is the elastic hysteresis, and L is the center distance between the two bolt holes on the diaphragm. If the deformation of the half coupling and the bolt is ignored, the problem is simplified to a mechanical model.