Method for Removing Broken Head Bolt of Vacuum Valve
The bolt is broken in the screw hole, which is troublesome during disassembly.
Several methods for unscrewing bolts
File square tenon screwing out method and pipe wrench screwing out method, suitable for bolts with a breakout bolt with a height above 5mm outside the screw hole;
The spot welding screw-out method is applicable to the condition that the broken head bolt is outside the screw hole or the broken head bolt is flat with the screw hole. It is made of flat steel drilled with a smaller hole than the screw hole. ;
Square hole wedge screwing method is suitable for bolts broken in screw holes. The method is to drill a small hole in the middle of the bolt first, tap the square hole taper into the small hole, and then screw it out;
The drilling and tapping recovery method is suitable for the case where the bolt cannot be removed. It is to flatten the cross section of the bolt first, after punching and punching, use a bit smaller than the internal diameter of the thread to drill, and tap according to the original thread.
Before the above screwing out method is adopted for broken head bolts, some conventional measures should be taken, such as kerosene soaking, removing oil stains on the surface (this is especially important for the screwing out method of spot welding, otherwise welding is not strong). If necessary, the bolts can also be heated around and the bolts can be unscrewed under thermoplastic conditions. Chemical screwing can also be used to unscrew the guillotine bolts. Properly cleaning rusted and corroded bolts and screw holes will speed up the guillotine bolts (water should be used to flush the screw holes after unscrewing the bolts to prevent corrosion of the remaining chemicals Valve).
