Time : 2018-04-26 Browse : 19
The grid coupling is widely used in low-speed and heavy-loaded long shaft transmission and high-speed transmission (such as gas turbine shaft transmission) due to its advantages of small radial size, large load-bearing capacity, few parts, small size and light weight. The point contact design of its grid plate and trapezoidal tooth groove makes it more flexible and can adapt to radial, angular and axial deviations. However, vibration problems may still occur during use, and effective measures need to be taken to avoid them.
From the structure and usage scenarios of the grid coupling, vibration can be avoided from the following aspects:
I.Ensure that the rotor is accurately aligned. This is the key to avoiding vibration. For example, for the use of fans, when the vibration of the fan drive end bearing is greater than that of the non-drive end, and is similar to the vibration of the motor drive end bearing in size and phase, and the frequency harmonic component in the spectrum is obvious, it often indicates that there is a misalignment problem between the fan rotor and the motor rotor. At this time, the alignment needs to be rechecked according to the specifications: first, without loosening the coupling housing, measure the runout of the fan and motor side journals; then loosen the housing and measure the alignment of the two rotors; finally, remove the snake spring for further precise testing to ensure that the rotor alignment meets the requirements. Just as the universal coupling needs to ensure that the two universal joints are in the same plane, precise alignment can reduce the vibration caused by the deviation of the transmission axis.
II. Check and eliminate other factors that may cause vibration. Through on-site measurement and analysis, if the vibration of the non-driving end of the fan is less than that of the driving end, and factors such as unbalanced impeller or rotor mass, bearing damage, poor installation lubrication, and fan flow channel problems are excluded (such as bearing vibration is mainly based on power frequency and there is no obvious fault frequency, and the fan vibration is not related to the baffle opening), then you can focus on solving the alignment problem and avoid interference from irrelevant factors.
III. Pay attention to maintenance in daily use. Regularly check the wear of the snake spring plate and the connection tightness of the coupling components to ensure that the snake spring plate and the tooth groove are well matched to avoid vibration caused by loose or worn parts. At the same time, maintain good lubrication and reduce friction and vibration between components, just like the lubrication-required coupling needs to check the lubricant condition regularly.
Through precise alignment, elimination of interference factors and daily maintenance, the vibration of the spring coupling can be effectively avoided during use, ensuring its stable operation and giving full play to its transmission advantages.
