The fixation of the expansion screw is to use the trapezoidal slope to make the expansion produce a lot of friction, knowing that the desired fixing effect can be achieved. Generally, the expansion screws we use are divided into two types: iron and plastic. The use method is based on Make the corresponding small holes according to the standard of the expansion screw, and then drive the expansion screw into it, so that it will play a good fixing role after the expansion screw is opened later. One side of the expansion screw is threaded and the other side is tapered.
The outside of the expansion screw is covered with iron sheets, and some expansion screws are covered with steel pipes. There are half incisions on the iron sheet cylinder, and then they are completely driven into the small holes made before on the wall. The nut is locked, and the nut pulls the screw out and pulls the tapered side into the iron cylinder. When the iron cylinder is expanded, it can be tightly fixed on the wall. These expansion screws They are all used on protective fences, air conditioners and other materials such as bricks and cement floors. The expansion screw is composed of some parts such as a screw rod and an expansion tube. The bottom of the screw rod has a conical shape. The diameter of the cone is much larger than the inner diameter of the expansion tube. When tightening the nut, the screw is required. If it is moved outward, the function of the express thread moves to one side, so that a very large pressure can be exerted on the outside of the expansion pipe, and the respective frictional force can play a fixing effect.