The fixing principle of the expansion screw: the fixing […]
The fixing principle of the expansion screw: the fixing of the expansion screw is to use the slanting inclination to promote the expansion to produce a frictional grip force to achieve a fixed effect. The screw is threaded at one end and has a vertebra at the end. The outer bread has a steel skin, and the iron cylinder has a few cuts in half. Put them together into the hole in the wall, and then lock the nut. The nut pulls the screw outward and pulls the vertebra into the steel cylinder. The tube is opened, so it is tightly fixed on the wall, and is generally used for fastening the fence, awning, air conditioner and the like on cement, brick and the like.
However, its fixing is not very reliable. If the load has a large vibration, looseness may occur, so it is not recommended to install a ceiling fan. The principle of the expansion bolt is to hit the expansion bolt into the hole on the ground or the wall surface, and then tighten the nut on the expansion bolt with a wrench, the bolt goes out, and the outer metal sleeve does not move, so the big head under the bolt is put The metal sleeve is opened, causing it to fill the entire hole. At this point, the expansion bolt will not be pulled out.