Why does the serpentine spring coupling have vibration problems

The serpentine spring coupling will inevitably have problems during use. Among the possible problems, there are more vibrations, so I will explain to you how to solve this problem. The advantages of this coupling It is a small radial size, large load capacity, long shafting transmission for low-speed and heavy-duty conditions, and a dynamically balanced gear coupling can be used for high-speed transmission, such as the shafting transmission of gas turbines.

The whole machine has fewer 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.Since the angular compensation of drum gear couplings is greater than that of straight gear couplings, drum gear couplings are commonly used. Straight gear couplings are an obsolete product and should not be used as much as possible.
　　Do not untieSerpentine couplingMeasure the beating of the fan and the motor side journal under the cover, then untie the serpentine spring coupling cover to measure the alignment of the two rotors, and then remove the serpentine spring to measure the alignment of the two rotors.
　　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.
　　Through the above analysis, the causes of failure 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 at the non-drive end. The bearing vibration at the drive end of the fan is close to the motor drive end bearing in size and 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 handling process The fault confirmation is determined after discussion, and the alignment of the fan rotor and the motor rotor is reviewed.
　　The detailed installation tutorial of the serpentine spring coupling:
　　1. Install the sealing ring and half sleeve
　　Turn off the power, cleanly wipe the two shafts connected to the coupling, and then apply grease to the half coupling and the sealing ring.Put the sealing ring on the shaft), without heating and cold fitting quick couplings, but heating interference fit.
　　2. Use two coupling adjustment and alignment scales to measure the gap between the two shaft sleeves, alignment conditions and coaxial conditions.The adjustment deviation is within the allowable range of the installed coupling.The adjustment range includes angular deviation.Parallel deviation and floating deviation.After alignment, the coupling provides a long service life and less maintenance of the coupling.
　　3. Install the serpentine spring
　　Before installing the serpentine spring, fill the groove between the coupling teeth with long-term lubricant, and then fix the spring on the coupling tooth groove with wood.Gently fasten the teeth of the beating hammer (note that all the gaps in the installation spring point in the same direction, which helps the anti-rotation block to properly contact the cover).Then scrape off any grease on the outside of the spring.Under normal circumstances, refuel every 6 months.
　　4. Install the coupling cover
　　Place the coupling seal ring on the appropriate position on the shaft sleeve, insert it into the groove in the lower half of the housing, install the gasket, and then install the upper half of the upper cover.Close the case and tighten the screws.Before the coupling works normally, please make sure that all parts have been installed correctly, the coupling has been firmly connected to the shaft, and the oil plug has been installed in the oil filling hole.