Common failures of couplings

Published: 2020-01-16

With teethCouplingIn daily use,Coupling manufacturersTake you to understand that the coupling often has the following failures:

1.CouplingBroken tooth.

2. The axial displacement of the coupling gear is relatively large, even unable to mesh.

3.CouplingThe tooth surface is severely damaged.

4. The coupling bolt is broken.

The reasons for these failures are mainly the following two aspects:

1. The horizontal and coaxiality errors of these two shafts are too large, which are beyond the coupling range, and can be compensated, so that the meshing between the shaft teeth and the internal teeth is inaccurate, resulting in local contact and additional torque.

2. Insufficient or insufficient oil savings in the coupling of lifting accessories.Or improper use of grease can lead to calcification of the grease, resulting in lubrication failure between the tooth surfaces, or poor lubrication, resulting in serious wear on the tooth surface.

Solution: This type of failure is difficult to handle and requires shutdown.That is to re-center or re-center the side of the reducer, or re-center the side of the drum.First find the parts with larger deviations.In this way, first measure the deviation of the coupling from the side, that is, measure the levelness and coaxiality of the main shaft and the level and coaxiality of the reducer main shaft, and then adjust the levelness and alignment according to the quality scale. Take the fault.

In addition, the horizontality and concentricity errors of the two shafts are relatively large, which causes the coupling to be unable to roll.Similar to the reasons for the wear of the coupling gear of the lifting accessories mentioned above, in addition to the normal force, the connecting bolt also breaks due to the additional bending moment.This is the main reason.This reason mostly occurs when the level difference between the left and right of the reducer main shaft is large.In addition, small bolt diameters, insufficient strength, or poor bolt materials can also cause bolts to break.

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