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Introduction and operating principle of Micro Switches

2020-01-07

Introduction and operating principle of Micro Switches A Micro Limit Switch is a contact mechanism with a small contact interval and a fast-acting mechanism. It uses a specified stroke and a predetermined force to perform the switching operation. It is covered with a housing. There is a switch with a driving rod on the outside because the contact distance It is relatively small, so it is called a micro switch, also called a sensitive switch. The electrical text symbol is: SM. working principle External mechanical force acts on the action through transmission elements (pins, buttons, levers, rollers, etc.) Waterproof Micro Switches On the reed, an instantaneous action occurs when the action reed is displaced to a critical point, so that the movable contact and the fixed contact at the end of the action reed are quickly turned on or off. When the acting force on the transmission element is removed, the action reed generates a reverse action force. When the reverse travel of the transmission element reaches the action critical point of the reed, the reverse action is instantaneously completed. The micro switch has a small contact distance, a short action stroke, a small pressing force, and a fast on-off. The speed of the moving contact has nothing to do with the speed of the transmission element. 2 types edit Micro Switches Types, with hundreds or thousands of internal structures. There are ordinary type, small size, and ultra-small size according to volume. According to protection performance, there are waterproof, dustproof, and explosion-proof types. Single type, double type, multi-connection type. There is also a strong disconnect micro switch (when the switch's reed does not work, external force can also open the switch); according to the breaking capacity, there are ordinary type, DC type, micro current type, high current type. According to the use environment, there are ordinary type, high temperature type (250 ℃), ultra high temperature ceramic type (400 ℃) Micro-switches generally use the auxiliary type without auxiliary pressing as the basic type, and derive a small stroke type and a large stroke type. Different auxiliary pressing auxiliary parts can be added according to the needs. According to the different pressing auxiliary parts added, the switches can be divided into various types such as button type, reed roller type, lever roller type, short boom type, long boom type and so on. Micro-switches are used for automatic control and safety protection in equipment that requires frequent circuit changes. They are widely used in electronic equipment, instruments, mines, power systems, household appliances, electrical equipment, and aerospace, aviation, ships, missiles, Military fields such as tanks have been widely used in the above fields. Although the switch is small, it plays an irreplaceable role.

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