Micro-switch principle Micro-switch wiring method

Micro-switch is a small electromechanical switch, which has been developed continuously since it came out in 1930s to meet various application requirements, including aerospace, household appliances, boiler control, medical equipment, spraying systems, test equipment, timers and vending machines. Next, Bian Xiao introduces the principle of microswitch and the wiring method of microswitch.

Principle of microswitch

External mechanical force acts on the action reed through transmission elements (push pin, button, lever, roller, etc.). ), and when the action reed is displaced to the critical point, instantaneous action is generated, so that the moving contact and the fixed contact at the end of the action reed can be quickly connected or disconnected.

When the force on the transmission element is removed, the action reed generates a reverse force, and when the reverse stroke of the transmission element reaches the critical point of reed action, the reverse action is completed instantly. Micro-switch has the advantages of small contact spacing, short action stroke, small pressing force and fast on-off speed, and the moving speed of moving contact has nothing to do with the moving speed of transmission element.

Wiring method of microswitch

When it comes to the connection mode of microswitch, it's actually very simple. Generally, a microswitch has three points, one is a common point, the other is a normally open point and the other is a closed point. The common point is like the zero line in the socket. The normally open point is the point where the switch is turned on to make the current flow, and the closed point is of course the contact point to disconnect the current. Just connect the corresponding points to the corresponding positions. Although the connection mode of microswitch looks simple, it needs to be prepared.

Use of microswitch

Micro-switches are small in size but have great functions, which can be seen everywhere in our lives. Such as computer mouse, car mouse, automotive electronic products, communication equipment, military products, testing instruments, gas water heaters, gas stoves, small household appliances, microwave ovens, rice cookers, floating ball equipment, medical equipment, building automation, power tools and general appliances, radio equipment, 24-hour timers, etc.

Types of microswitches

There are many kinds of microswitches with hundreds of internal structures, which are divided into ordinary, small and ultra-small according to volume; According to the protective performance, there are waterproof, dustproof and explosion-proof types; According to the disconnection form, there are single connection type, double connection type and multi-connection type. At present, there is also a strong disconnect microswitch (when the reed of the switch doesn't work, the external force can also turn the switch off); According to the breaking capacity, there are ordinary type, DC type, micro-current type and large current type.

According to the use environment, there are ordinary type, high temperature resistant type (250℃) and super high temperature resistant ceramic type (400℃). The basic type of general microswitch is that there is no auxiliary pressing attachment, which leads to short stroke and long stroke programs. Accord to needs, different auxiliary press accessories can be added, and according to that different press accessories added, the switch can be divided into various forms such as button type, reed roller type, lever roller type, short moving arm type, long moving arm type and the like.