What kind of swings are you asking about...a metal swing set with chains and seats, rope swings, chair type swing? Please repost with more information so you can get specific help for your project. Even better with a picture.
If you can post a picture that would be helpful so we can see exactly what you need help with.
If you are having issues with a children's swing set you can purchase replacement swings, etc. With a swingset being outdoors in all kinds of weather it is just a few years and plastic gets brittle and breaks, chains rust and become unsafe, and everything just starts to look shoddy. Do what you can to make it look better and replace what you have to for safety.