Definition:

A screwdriver is a tool used to turn a screw to force it into place, usually with a thin wedge-shaped head that can be inserted into the groove or notch of the screw head - Beijing-Tianjin-Hebei, Jinyu and western Shaanxi dialect is called "change cone", Anhui, Hubei and other places are called "driver", the central and western regions are called "change knife", the Yangtze River Delta region is called "rotary chisel". There are two main types: one character (negative sign) and cross (positive sign). Also common are hexagonal screwdrivers, including hexagon and hexagon.

Technical principle:

The screwdriver takes advantage of the working principle of the lever when used to pry the paint cover. The larger the distance from the power point to the fulcrum, the more labor-saving, so the long cone is more labor-saving than the short one.

Screwdrivers take advantage of the working principle of the axle when used to tighten screws. When the wheel is larger, the effort is reduced, so it is less effort to use a thick cone than a thin cone to tighten the screws.

Basic features:

When repairing a mobile phone, you need to use a screwdriver to open the case (some phone cases are snap lines without a screwdriver). Most of the screws used are hexagonal screws; Different mobile phones have different specifications, generally T5, T6, T7, T8, etc., and some models are also equipped with special screwdrivers, which require a special screwdriver. In addition, you also need to prepare some small one-word and small plum screwdrivers. When choosing such tools, you can choose A and B sets, which include almost all mobile phone open-shell tools. When opening the casing, select a suitable screwdriver according to the type and specification of the fixing screws on the casing. If the selection is not appropriate, the slot of the screw may be flattened, resulting in slippage.