1. Stop the generator: First, stop the operation of the generator immediately to avoid further damage.
2. Power failure: make sure to disconnect the power supply of the generator to prevent the danger of electric shock.
3. Remove the slip ring: If you have relevant skills and tools, you can try to remove the slip ring and take out the falling objects. Please note that this requires corresponding technical ability and safety awareness. If you are not sure, it is recommended to seek the help of professional and technical personnel.
4. Seek professional help: If you can't solve it yourself, it is recommended to contact a generator maintenance professional, who has professional knowledge and experience and can better handle this problem.
In short, to solve this problem, you need to operate carefully to ensure safety. If you are not sure about your ability, you'd better seek professional help.