Rotary kiln is a common equipment for calcining lime, cement and metal minerals, which is widely recognized in the industry. The supporting roller is an important structure in the supporting device of the rotary kiln, which is responsible for supporting the weight of the rotary kiln and controlling the direction of the rotary kiln barrel to prevent it from moving up and down.

In actual use, when you find that the surface material of the supporting wheel is peeling off in a large area, the shaft and pad are heated and drawn, there is irregular wear, the supporting wheel is cracked, the shaft slips, the bearing is broken, or the service life is too long to meet the conditions of stable operation, you should consider replacing the supporting wheel.

How should the supporting wheel be replaced? Let's take a look at the general replacement steps.

Replacement steps of supporting roller of rotary kiln

1. Determine the scheme.

When replacing the supporting roller of the rotary kiln, the maintenance scheme shall be determined according to the actual damage of the supporting roller. For example, if you encounter the damage of only one side of the supporting roller, you only need to consider replacing one side.

2. Preliminary preparation

The first is to prepare maintenance tools, such as Jack and chain block. The second is to clean the replacement site and remove the oil stain on the supporting wheel. The third is to find the center line and mark it on the base and foundation to ensure that the correct position can be found during replacement.

3. Cooling kiln body

Power off and stop the kiln. After the kiln body cools down, place the jack under the wheel belt and tighten it. In order to prevent slipping, place a wooden board on the top, and then remove the unnecessary parts such as the heat insulation shed, supporting wheel tile cover, cooling water pipe, oil and tile temperature measuring line, and place them in a flat place in order for later installation.

4. Jack up the kiln body

The jack is located under the wheel belt. Jack up the wheel belt. Pay attention to the condition of the jack during the jacking process. Once there is pressure leakage and sinking, stop the operation immediately and continue after troubleshooting.

5. Remove the bolts

Remove the bolts connecting each part, and it is recommended to keep the number, so as to avoid forgetting the corresponding position during later installation. Then use chain fall or Jack to push away the supporting wheel and move it to a position convenient for lifting.

6. Lift off the supporting roller

Pull out the supporting wheel and bearing seat, clean the supporting wheel, drain the lubricating oil, remove the dust and corrosion accumulated for a long time on the base, lift the supporting wheel and bearing away with a crane and place them in an open and flat position.

7. Cleaning and inspection

Firstly, clean the supporting wheel and check the wear of the supporting wheel. Secondly, clean the bearing seat, and clean the inner cavity with light diesel oil. After cleaning, pay attention to cover and prevent dust. Pay attention to judge whether the spherical tile can still be used. If it cannot be used, remove it and replace it with a new tile of the same size. If it can be used, clean it in the same way and cover it for dust prevention.

8. Replace the supporting roller

Check whether the dimensions of the new supporting roller are consistent, and measure the dimensions of the new supporting roller. First open the tile mouth, then scrape and grind the lining tile and the shaft, check the tile back, and install and fix it after confirmation. Then lift the new supporting wheel onto the lining tile and place it as gently and stably as possible without damaging the base. Finally, check the position of the new supporting wheel to ensure that the stress of the new supporting wheel after replacement is consistent with that of the old supporting wheel.

9. Handling details

After installation, tighten the fixing bolts, pull the bearing seat back to its original position, install the oil spoon, add lubricating oil, connect the circulating water required for cooling, and install the heat insulation shed, water and oil temperature measuring line, etc.

10. Inspection and acceptance

For slow rotary kiln, check the operation of kiln body, check whether the oil film is normal, observe the clearance of oil scoop, bearing seat, oil drip pan and other parts, and the contact between thrust disc, pad and shaft to ensure the normal operation of rotary kiln. Finally, clean up the site and complete the replacement work.

These are the general steps for the replacement of supporting wheels. In the actual replacement, everyone will make some changes according to their own equipment. Supporting roller is an important part of rotary kiln operation. Its quality directly affects whether the rotary kiln can work normally with quality and quantity. Therefore, when it is found that the supporting roller is damaged, do not hesitate to replace it as soon as possible, so as not to cause greater losses.