What are the possible causes of abnormal vibration of the large ring gear of the rotary kiln?

1. Rotary kiln kiln body parts wear and overall sinking. The rotary kiln is a large-load continuous operation equipment. After long-term operation, the rolling ring, supporting wheel, backing plate and other parts wear greatly, and the uneven foundation settlement causes the overall kiln body to settle. decreases, causing the tooth tip clearance to become smaller, causing vibration. Sometimes, although the overall kiln line does not drop, the support position close to the large ring gear drops, which also causes the large ring gear to vibrate. This is due to the foundation of the support position sinking or being severely worn, or due to improper kiln adjustment.
2. Caused by wear of connecting parts. The ring gear is connected to the kiln body through a spring plate pin. The ring gear itself is manufactured in sections and is integrated into a whole by using countersunk screws. After the pins, countersunk screws, and these connecting parts are worn, the ring gear components will loosen and the local ring gear will sink, which will also cause the tooth top clearance to become smaller and cause vibration. From a maintenance perspective, the only solution is to replace (or tighten) the corresponding screws. Of course, for countersunk screws, from the perspective of design and manufacturing, it is better to make the ring gear as a whole (or tightly connected) instead of connecting it with countersunk screws, so as to fundamentally eliminate the vibration cause (large tooth factor). The fact that the flaps are made to be turned over is another issue. Practice has proved that the large ring gear has a simple tooth shape and a low rotational speed. It can still operate normally after half of the tooth thickness is worn).

3. The cylinder at or around the ring gear is bent, causing the large ring gear to deflect excessively in the radial direction and cause vibration. This is manifested in the fact that during the meshing operation of the large ring gear and pinion, the top clearance is smaller for half a turn and smaller for half a turn. The vibration is also a periodic half-vibration. Therefore, the real cause of vibration is that the top clearance is too small.
4. Problems with the ring gear itself. The top clearance of the transmission gear is generally 0.2-0.25 times the module. Due to its large outer diameter and radial deflection of the large ring gear of the rotary kiln, the top clearance is 0.28 times the module plus 0.5-1mm. At the same time, it is required that the radial runout and axial deflection of the large ring gear should not be greater than 2mm after installation. Most of the large ring gears are caused by runout or deflection. Since the large ring gear is connected to the kiln body through the spring plate shaft pin, the large ring gear itself is made into two half rings and combined into a whole with countersunk screws.
5. Vibration caused by tooth thickness wear. The vibration caused by this reason appears as continuous and rhythmic vibration, which can be observed through the meshing of the large ring gear and pinion.
6. The pinion gear is not installed in place. In most rotary kilns, the large ring gear and the two pinion gears form an equilateral triangle in the ideal meshing state, but the angle has changed after long-term operation.