First, what is a microswitch
Microswitch is a switch with a tiny contact interval and snap-action mechanism, with a specified stroke and specified force for switching action of the contact mechanism, covered with a shell, the external drive rod of a switch, because of its switching contact spacing is relatively small, it is called a microswitch, also known as a sensitive switch. The electrical symbol is SM.
Second, what is the use of microswitch
External mechanical force through the transmission element (pin, button, lever, roller, etc.) will be applied to the action of the force on the reed, when the action of the reed displacement to the critical point of the instantaneous action, so that the action of the reed end of the dynamic contact and the fixed contact quickly connected or disconnected.
When the force on the actuator element is removed, the action reed generates a reverse action force, and when the reverse travel of the actuator element reaches the action threshold of the reed, the reverse action is completed instantaneously. The contact pitch of the micro switch is small, the action stroke is short, the pressing force is small, and the on-off is rapid. The action speed of its movable contact has nothing to do with the action speed of the transmission element.
Mainly used in some electrical appliances above the switch, such as computer mice, car mice, automotive electronics, communications equipment, military products, test instruments, gas water heaters, gas stoves, small household appliances, microwave ovens, rice cookers, float equipment supporting, medical equipment, building automation, power tools and general electrical and radio equipment, 24-hour timer, etc.
Three. Micro switch types
Micro switch types, the internal structure of hundreds of kinds, according to the volume of ordinary, small, ultra-small; according to the protection performance, waterproof, dust-proof, explosion-proof; according to the form of breakage points, there are single-type, double-type, multi-connected type. There is also a strong disconnecting micro switch (when the reed of the switch does not work, the external force can also make the switch disconnect); according to the breaking capacity, there are ordinary type, DC type, micro-current type, high-current type. According to the use of environmental points, there are ordinary, high-temperature type (250 ℃), ultra-high-temperature ceramic type (400 ℃)
Microswitches are generally unassisted pressing accessories for the basic type, and derived from the small stroke type, large stroke type. According to the need to join different auxiliary pressing accessories, according to join different pressing accessories switch can be divided into button type, reed roller type, lever roller type, short moving arm type, long moving arm type and other forms.
Microswitch in the need for frequent switching circuit equipment for automatic control and safety protection, etc., widely used in electronic equipment, instruments, mines, electric power systems, household appliances, electrical equipment, as well as aerospace, aviation, ships, missiles, tanks, and other military fields, has been widely used in the above areas, the switch, although small, but plays an irreplaceable role.
At present, the domestic market micro switch according to the use of different requirements, the mechanical life of the switch has 3W times to 1000W times ranging from 10W, 20W, 50W, 100W times, 300W times, 500W times, 800W times, the domestic general use of beryllium bronze, tin bronze, stainless steel wire to do the reed, foreign ALPS can do up to 1000W times, their reeds are made of beryllium bronze, tin bronze, stainless steel wire to do reed, foreign ALPS up to 1000W times, their reeds are used in the same way, but they can be used in the same way, the highest can do 1000W times. Their reeds are made of titanium, a rare metal. Domestic Tengfei electronics produced by the WK-01B can reach up to 1000W times.
The application of microswitches is very wide, the use of microswitches greatly facilitates people's lives, making our lives better. If you need to install a microswitch in your home, then you must pay attention to the matters mentioned in this article when you use it.