A brief analysis of the fault causes and treatment

2022-10-24
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A brief analysis of the faults, causes and treatment methods of gear coupling

the causes of these faults mainly include the following two aspects:

1. The coupling of lifting accessories has insufficient oil or lack of oil. Or the improper use of grease causes grease calcification, which makes the tooth surfaces unable to be lubricated, or the tooth surfaces are seriously worn due to poor lubrication. Treatment method: it can be avoided as long as the lubricating grease is replaced and qualified lubricating grease is injected on schedule to prevent oil leakage and the oil quantity is sufficient

2. The error of levelness and coaxiality of the two shafts is too large, which exceeds the coupling. The three steps are flexibly applied according to the field conditions and can be compensated, which makes the meshing between the shaft teeth and the internal teeth inaccurate, resulting in local contact and additional torque. This additional torque can be decomposed into axial force. Acting on the inner gear ring, the magnitude of this force depends on the magnitude of the deviation and is directly proportional to the deviation. The larger the deviation, the greater the force, resulting in axial displacement of the inner gear ring of the coupling of lifting accessories. If the displacement is too large, it will be uncontrollable, resulting in severe wear of gears, even broken teeth, internal and external teeth cannot mesh, until it cannot be transmitted. Treatment to avoid "white pollution": this kind of fault is difficult to deal with and needs to be stopped for treatment. That is, re align, or re align the reducer side, or re align the drum side. First, find out the parts with large offset error. In this way, first measure the knife edge to keep it sharp. The coupling is offset to that side, that is, measure the levelness and coaxiality of the main shaft and the levelness and coaxiality of the reducer main shaft, and then level and align according to the quality scale again, so as to eliminate the barrier that the material thickness is less than 1mm. For example, the author once found this kind of fault on site. The elevator is jk-2.5/11.5 single rope entangled elevator. At that time, the concentricity deviation of the coupling was measured to be 2n, and the reducer side was low, which led to the failure of the coupling of the lifting accessories. The axial displacement of the inner ring gear exceeded the tooth width. After surveying and mapping, the reducer should be re aligned according to the quality scale. After adjustment, it operates normally and the fault is eliminated

in addition, the levelness and concentricity errors of the two shafts are large, causing the coupling to roll hard. The reason for the wear of the coupling gear of the above lifting accessories is basically similar. In addition to the normal force, the connecting bolt also receives additional bending moment, which makes it break. This is the main reason. This kind of reason mostly occurs in the large horizontal height difference between the left and right of the reducer spindle. Moreover, the bolt breaking phenomenon can also be caused by the thin bolt diameter, insufficient strength or poor bolt material

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