How to avoid vibration in the use of serpentine spring coupling

The serpentine spring coupling is a new structure of metal.It relies on serpentine springs to transmit torque.The serpentine spring coupling is a relatively new shaft connection transmission component in the field of global machinery today. The serpentine spring coupling is a universal shaft connection transmission tool, which bears a large torque, and is suitable for heavy machinery and general mechanical occasions.So which of the diaphragm coupling and the serpentine spring coupling is effective? In fact, both couplings are flexible couplings with metal elastic elements, and they are irreplaceable in their own working conditions. It works, so I can’t say which one is better.In fact, we can make a good choice about how to use the two by carefully reading the performance characteristics of the two.

The serpentine spring coupling will inevitably have such problems during use. Among the possible problems, there are more vibrations. So the editor will explain to you how to solve this problem. This joint The advantages of the shaft are its small radial size, large load capacity, and long shaft transmission under low-speed and heavy-duty conditions. The dynamically balanced gear coupling can be used for high-speed transmission, such as the shaft transmission of gas turbines. .The whole machine has few parts, small size and light weight. The spring leaf designed as a trapezoidal cross-section and the trapezoidal tooth groove are particularly convenient and close, so that the assembly, disassembly and maintenance are simpler than ordinary couplings.Because the angular compensation of drum gear couplings is greater than that of straight gear couplings, drum gear couplings are widely used. Straight gear couplings are obsolete products and should not be used as much as possible.Because the spring leaf and the tooth arc surface are in point contact, the coupling can obtain greater flexibility.It can be installed to work normally under conditions of radial, angular and axial deviations at the same time.Therefore, the vibration solution is:

(1) According to the field measurement data, the vibration of the non-drive end of the fan (impeller side) is less than the vibration of the drive end. The vibration of the two fans is not caused by the unbalanced mass of the serpentine spring coupling of the impeller itself or the unbalanced mass of the fan rotor after installation caused.

(2) Bearings and vibrations in all directions are dominated by power frequency, with obvious double frequency components.Whether there is an obvious bearing failure frequency, it indicates that the bearings are not faulty and the installation and lubrication are good.

(3) Whether there is an obvious passing frequency of the blades, and the field test has confirmed that the fan vibration has no relationship with the opening of the baffle, indicating that the flow part of the fan is normal.

Through the above analysis, the causes of failures such as unbalanced mass of the fan impeller, unbalanced fan rotor, bearing damage and poor installation lubrication, and damage to the flow part of the fan are eliminated.The vibration of the bearing at the drive end of the fan is greater than that of the non-drive end. The bearing vibration at the drive end of the fan is close to the motor drive end bearing in size but opposite in phase. The horizontal, vertical, and axial vibrations of each bearing are relatively large, and the double-frequency components in the frequency spectrum are more obvious Other phenomena indicate that the two fans may have the problem of misalignment between the fan rotor and the motor rotor.Fault confirmation and processing process The fault confirmation is determined after research, and the alignment of the fan rotor and the motor rotor is rechecked.At first, measure the beating of the fan and motor side journal without removing the serpentine spring coupling cover, then untie the serpentine spring coupling cover to measure the alignment of the two rotors, and then remove the serpentine spring Measure the alignment of the two rotors.