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Analysis and Maintenance of the Rigidity of the Diaphragm Coupling

Author: Ever-Power Coupling Release Date: 2016-03-17 11:46 Click:
Diaphragm couplings inevitably have installation errors such as axial deviation, angular misalignment, and radial misalignment. The following analyzes the influence of various installation errors on the mechanical properties of the diaphragm coupling.

  Diaphragm couplings inevitably have installation errors such as axial deviation, angular misalignment, and radial misalignment. The following analyzes the influence of various installation errors on the mechanical properties of the diaphragm coupling.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 greater impact on the comprehensive displacement of the diaphragm coupling. The radial error has a relatively small effect on the overall displacement.Since the large equivalent stress of the diaphragm coupling appears at the outer ring bolts, which is mainly caused by the bolt pre-tightening force, the installation error has little effect on the large equivalent stress, but the installation error has a small effect on the equivalent stress of the diaphragm group and its The distribution law has a greater impact.
  (1) Considering the loads such as bolt pre-tightening force, torque, centrifugal force, etc., a calculation model of diaphragm coupling is established. Through contact finite element analysis, the influence of installation error on the mechanical properties of diaphragm coupling is studied.
  (2) The equivalent stress value of each diaphragm is quite different, the diaphragm stress at both ends is large, and the middle diaphragm decreases successively and the distribution is more uniform. The centrifugal force has a more obvious influence on the diaphragm stress.
  (3) Axial deviation, radial misalignment, and angular misalignment. Moderate installation errors have a greater impact on the comprehensive displacement and equivalent stress of the diaphragm group. Among them, the angular error has a large impact, and the angular error should be strictly controlled during installation. .
  If the axial displacement of the coupling △K is known.And the angular displacement △K, the axial and angular restoring force of the membrane sill can be obtained, so that the axial deformation stiffness and the bending stiffness during angular deformation can be obtained. This article mainly analyzes the torsional stiffness of the coupling. f When the torque is delivered, the diaphragm is elastically deformed under the force, so that the diaphragm coupling produces a small elastic backlash.The force condition T of the diaphragm is the nominal torque, r is the elastic hysteresis, and L is the center distance of the two bolt holes on the diaphragm. If the deformation of the half coupling and the bolt is neglected, the problem is simplified to a mechanical model.
  It is difficult for large machinery and equipment to adjust the alignment of the two shafts. Choose a coupling that is durable and easy to change wearing parts.Metal elastic element flexible couplings generally have a longer service life than non-metal elastic element flexible couplings.The need for sealing and lubrication and the use of non-durable couplings will inevitably increase the maintenance workload.For occasions with long-term continuous operation and high economic benefits, such as the high-speed end of the rolling mill transmission system of my country's metallurgical enterprises, gear couplings are currently widely used. Although the gear couplings theoretically transmit large torque, they are lubricated It can work for a long time only under the condition of good sealing.In addition, it is necessary to frequently check the sealing condition and inject lubricating oil or grease. The maintenance workload is large, which increases the auxiliary working hours, reduces the effective working time, and affects the production efficiency.The industry is developed, and the diaphragm coupling with long service life, no lubrication and maintenance has been commonly used instead of the drum-shaped gear coupling, which not only improves the economic efficiency, but also purifies the working environment.In the rolling mill transmission system, the flexible movable pin coupling and the sector-shaped elastic coupling developed in our country are selected, which not only has the advantages of the diaphragm coupling, but also has a good cushioning effect and a low price.
 

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