Expansion pin cylinder is a special tool used to fix buildings or other objects, and its working principle is based on the characteristics and principles of expansion pins. Expansion pin is a fixed component with a special structure and material that can expand inside the fixed object, thereby firmly fixing it inside the fixed object and achieving a fixing effect.

The expansion pin cylinder is usually composed of expansion pins, springs, nail rods, and other components. Its working principle is as follows:

1. Choose the appropriate position and aperture: Firstly, select the appropriate position and aperture on the object that needs to be fixed for installing the expansion pin cylinder.

2. Insert the expansion pin cylinder into the hole: Insert the expansion pin of the expansion pin cylinder into the pre drilled hole to ensure that the position of the expansion pin cylinder is correct.

3. Rotating nut: By rotating the nut on the spring, the spring is compressed and the expansion pin cylinder is fixed in the hole.

4. Hammer nail rod: Use a nail rod to hammer the expansion pin cylinder, causing the expansion pin to expand and be compressed by the fixed object, thereby achieving the fixing effect.

5. Complete fixation: After the expansion pin is fully expanded and fixed inside the fixed object, loosen the nut to restore the spring to its original state. At this point, the expansion pin cylinder has completed its fixing function.

Through the above steps, the expansion pin cylinder can achieve a fixed effect on buildings or other objects. This fixing method has the characteristics of firm fixation, easy operation, and long-lasting effect, and is widely used in fields such as construction, furniture, and mechanical equipment.

In general, the working principle of the expansion pin cylinder is to achieve the fixing effect through the expansion and contraction of the expansion pin inside the fixed object. The structure is simple, easy to use, and the fixing effect is reliable. It is a commonly used fixing tool.