Anchors are widely used in the elevator and the car repair industry, its fixed is to use the trapezoid Angle to let inflation appeared a lot of friction, know to want to fixed effect, generally we use to the expansion of the screw is divided into two kinds of iron and plastic, its usage is according to the standard to make corresponding holes expansion screws, expansion screws up after go in future expansion screws open will have very good fixation effect.One side of the expansion screw is threaded and the other side is taper.

Expansion outside of the screw is wrapped in a metal, some anchors is encase with steel pipe, sheet metal cylinder on half of the incision, and then put them all into before the holes on metope, in with the nut lock, nut to screw and pull outward pull with one side of the taper into the tin drum, in a metal cylinder has been expanding from, can be a very tight is fixed on the wall surface, the expansion screws are used in fencing, air conditioning and so on the top of the brick, concrete and other materials.Anchors is screw and composed of some parts such as expansion pipe, the screw on the bottom of the cone, the diameter of the cone are much larger than the inner diameter of the expansion pipe inside, when the nut tightening, the screw is to move outward, move in express the function of the thread to one side, so you can outside the expansion pipe trip very big pressure, coupled with their friction force can play a fixed effect.