Micro switch, the English name is Micro Switch, abbreviated as SM, also known as sensitive switch, officially defined as "a contact mechanism with a small contact interval and a snap-action mechanism, with a specified stroke and specified force for switching action. , The "micro" in "micro switch" does not mean that a slight movement can trigger the switch to act, but that the switch action is very weak and can be completed in an instant. The micro switch is covered by the shell and has a drive rod outside. In fact, the micro switch refers to a switch that can be turned on and off very quickly. and many other features.
Micro switch structure
The micro switch is mainly composed of five parts: the actuator part, the contact part, the shell part, the quick-action mechanism part and the terminal part. Among them, the actuator part is mainly used to transmit the external force or stroke to the internal mechanism; the contact part is mainly used to actually open or close the electrical circuit; the shell part is mainly used to isolate the internal mechanism from the outside, with high insulation and mechanical strength; the snap action mechanism part is the core part of the micro switch, using high-quality conductive spring material, it is mainly used to perform snap action; the terminal part is mainly used to connect with the outside.
When the external force acts on the actuator part (the display form of the actuator part on the specific switch may be slightly different, some are push pins, buttons, some are levers, rollers, etc.), the corresponding actuator components will transmit the force to the action spring When the reed moves to a certain critical point, the switch is triggered to act, so that the movable contact and the fixed contact located at the end of the action reed are quickly connected or disconnected.
When the external force acting on the transmission part is withdrawn, the action reed will have a reverse displacement, and when the reed moves to a certain fixed critical point, the switch will be triggered and the reverse action will occur instantaneously.
1. The current and voltage used are relatively small, so it is best to use low-power circuit devices at this time, and it is best not to use copper wires, because the safety problem of electricity will occur.
2. If the environment used is relatively humid or the temperature is relatively high, it is best to use composite silver gold-plated points.
3. When opening or closing, try not to be too large, and do not open or close frequently, otherwise the service life will be reduced.
4. When using, in order to prevent the screw from loosening and damage, it is best to use a washer, in this way, the device will be firmer and not easy to fall off.
5. The micro switches of electronic products are generally relatively small, and the internal structure is very precise. If the user uses too much force, it is easy to damage the precise structure. In addition, the switch cannot be pressed all the time. Such behavior will easily lead to They fail, and in subsequent use, the switch is not responsive enough.
