When the girth gear is assembled there should be liberal use of something like Locktite brand anaerobic thread locker, preferably a high strength version. Usually Allen head cap screws are recommended for bolting the segments together.
There are many different ways to build a girth gear. I need more details to propose a fix. A detail about the defective part could help. The direction of the crack might show a lot. What is the mass in motion? Location: In the …
Regular inspections, proper lubrication, alignment, material quality assurance, and operational adherence to limits form the foundation for ensuring the longevity and reliability of girth gear sections in industrial machinery. These proactive measures minimize downtime, reduce repair costs, and uphold operational efficiency in industrial settings.
I've worked with girth gear problems in many plants, on various rotary kilns & ball mills (up to 5000 hp). The previous responders are spot on regarding the cause of pitting. There are some additional methods for correcting pitting on the girth gear regarding carburized pinions and machine in place technology.
1. Measure involute wear on gear. 2. Clean and crack detect gear using magnetic particle method. 3. Install Hofmann case hardened pinion. Case hardness must exceed 55HRC. 4. Laser align drive train. 5. Accurately in situ grind girth gear using the case hardened pinion as a master. 6. Apply Hofmann Lubrication A primer to pinion and gear. 7.
The girth gear is an critical part in ball mills. Reducing the wear rate of the gear as far as possible and extending its service life can improve the operation efficiency of the ball mill, reduce the maintenance frequency and avoid the shutdown …
