During the decoration process, we often use expansion bolts, so it is very important for consumers to understand the principle and use of expansion bolts. Next, let me introduce the principle and use of expansion bolts.
Expansion bolt principle
The principle of expansion bolts is to drill the expansion bolts into holes in the ground or wall, and then use a wrench to tighten the nuts on the expansion bolts. The bolts will move out, while the external metal sleeve will not move. As a result, the big head at the bottom of the bolt can fill the entire hole with the metal sleeve, causing it to expand and fix. At this time, the expansion bolt will be difficult to pull out.
Expansion bolts produce frictional gripping force through a curved slope, thereby achieving a fixing effect. One end of the screw is threaded, and the other end has cones. The outside is covered with a layer of iron sheet, and there are several cuts in half of the iron sheet cylinder. Put them together into the holes drilled in the wall, and then lock the nuts. The nuts can pull out the screws, allowing the cones to enter the iron cylinder, allowing them to expand and be fixed to the wall. It is generally used for the installation and fixation of various guardrails, awnings, air conditioners, etc. on cement, bricks and other materials. However, its fixation is not very reliable. If the load vibrates significantly, it may become loose, so it is not suitable for installing ceiling fans, etc.
How to use expansion bolts
Before using expansion bolts, you need to use an impact drill (hammer) to drill holes of corresponding sizes on the fixed body, then install the bolts and expansion tubes into the holes, and finally tighten the nuts to connect the bolts, expansion tubes, and mounting parts to the fixed body. The fixed bodies are tightened to form one body.
When the nut is tightened, the bolt will expand. There is a large head at the end, with a round pipe slightly larger than the diameter of the bolt, and several openings at the tail. When the bolt is tightened, the tail of the big head will enter the inside of the open pipe, expand the pipe, and achieve the purpose of expansion, and then fix the bolt to the ground or wall, thereby achieving the effect of expansion and rooting.
In short, understanding the principle and use of expansion bolts is very necessary for consumers who use them during decoration. Only when expansion bolts are used and installed correctly can their fixing effect and safety be ensured.
