Faults, causes and treatment methods of gear couplings

Gear couplingIn the course of daily use, the coupling often has the following four failures: 1. The coupling tooth surface is severely damaged. 2. The axial displacement of the gear ring of the coupling is large, and it can't even mesh. 3. The coupling has broken teeth. 4. The coupling bolts are broken.

The causes of these failures mainly include the following two aspects: 1. Insufficient or lack of oil in the coupling of the lifting accessories.Or improper use of grease can cause calcification of the grease, resulting in the inability to lubricate between the tooth surfaces, or poor lubrication, resulting in serious tooth surface wear.Treatment method: As long as the new grease is replaced, qualified grease oil is injected regularly to prevent oil leakage, and the oil quantity can be avoided. 2. The horizontality and coaxiality error of the two shafts is too large, which exceeds the range that the coupling can compensate, which makes the meshing of the shaft teeth and the internal teeth inaccurate, resulting in local contact and additional torque.And this additional moment can be decomposed into axial force.Acting on the inner gear ring, the magnitude of this force depends on the size of the deviation, and is proportional to the deviation. The greater the deviation, the greater the force, resulting in axial displacement of the inner gear ring of the coupling of the lifting accessories.If the displacement is too large, it will be uncontrollable, resulting in severe gear wear and even broken teeth.Handling method: This kind of fault handling is more difficult and needs to be stopped for handling.That is to re-align, or re-align the side of the reducer, or re-align the side of the reel.First find out the part with larger offset error, so first measure the offset of the coupling to that side, that is, measure the level and coaxiality of the main shaft and the level and coaxiality of the reducer main shaft, and then press the quality again. The fault can be eliminated by leveling and aligning the scale.For example, the author has found such failures on site. The promotion machine is a JK-2/5 single-rope entangled promotion machine. At that time, the concentricity deviation of the coupling was measured to be 11n, and the reducer side was low, which caused the The coupling of heavy parts cannot work, and the axial displacement of the inner gear ring exceeds the tooth width. After surveying and mapping, the reducer should be re-calibrated according to the quality scale. After adjustment, it runs normally and the fault is eliminated.In addition, the horizontality and concentricity of the two shafts have a large error, which causes the coupling to be awkward when rolling.The reason for the gear wear of the above-mentioned lifting fitting coupling is basically similar. In addition to the normal force, the connecting bolt is also subjected to additional bending moment, which causes it to break.This is the main reason.This kind of reason mostly occurs when the level difference between the left and right of the reducer main shaft is large.Furthermore, bolts with small diameters, insufficient strength, or poor bolt materials can also cause bolts to break.