1. Soak the place where the screw is stuck with bolt loosening liquid for a period of time. Then use a medium pipe wrench and use force if necessary. Don't burn the bolts. When tightening, tap gently with a hammer. See if you can squeeze it out. Don't use too much force to prevent the screw from breaking.

2. If you still can't screw it out, you can grind it into two large planes with an angle grinder and screw it again. Or connect a big nut with electric welding. First of all, make sure it has the possibility of positive and negative buttons and twist it in the right direction. You can take it out when the screw is loose.

3. If the screw breaks in the screw hole, you can choose an L-shaped round iron bar slightly smaller than the screw, and weld one end of the L-shaped round iron bar with the broken plug as a wrench. Welding is more reliable after drilling, and care should be taken not to damage the thread when welding. If there is some welding damage to the thread after it is taken out, it can be removed by screwing the thread with a tap.